bluuebunny/crossref_metadata_2025 huggingface dataset:
Theoretical and Experimental Studies on Thermal Consolidations Characteristics of Ningbo Soft Clay
Authors: Yin Tie Feng
Published: January 2014

When considering the effect of temperature, consolidation deformation of the soil is a complex multi-physics coupling problem. For soil of different regions, the influence of temperature on soil physical properties vary widely, even presents the opposite result. In order to realize the thermal consolidations characteristics of Ningbo soft clay, this paper selected Ningbo soft clay and done consolidation test with temperature controlled under different temperatures and confining pressures. Combined with the analysis of theory, this paper carried out the reasonable explanation to the experimenting phenomenon. The results show that: temperature increase the penetration rate of the soil by changing the coefficient of the water, thereby accelerating the consolidation process. The degree of consolidation increases with increasing temperature. In the same conditions and time, the higher the degree of consolidation of soil with increasing temperature, and the difference of the degree of consolidation increases with the increase of the difference in temperature. The difference of the degree of consolidation under different temperature increases with time showing a rapid increase in the extreme values first, and then gradually reduced to zero. Therefore, effect of temperature is mainly reflected in the drainage consolidation process less than half the period of time before, and the greater the temperature difference, the impact effect is more obvious.
Application of Horizontal Bamboo Bars in Highway Bridge Embankment Backfill
Authors: Chen Qiang , Kuang Yao Dong , Zhang Ben Jiao , Huang Bin
Published: January 2014

Because the backfill of highway bridge embankment is not dense enough and the located in the hard and soft transition area, the big settlement that threats the safety of driving usually occurs when influenced by the impact load of high-speed vehicles. According to statistic of investigation of the accidents on certain highway, the difference between settlements in bridge abutment and bridge back is around 32mm to 100mm. This kind of big settlement difference is the main reason for bumping and other problems harming the operation of highway. In this paper we experimentally use horizontal bamboo bars used in the construction of side bridge embankment to deal with the continuous backfill settlement, which is effective. Bar pile to treat the settlement of highway embankment backfill is one of the economical, reliable and effective treatment without constructional occupation of driving lanes.
Lateral Calculation and Analysis of Shear Lag Effect of Extra-Wide Triple-Cell Single Box Girder
Authors: Zhang Ming Jin
Published: January 2014

The main bridge of Yunshi Hanjiang River Bridge is a prestressed concrete extradosed bridge with two pylons, a single cable plane and with span arrangement (128+238+128) m. The main girder of the bridge is the concrete continuous triple-cell single box girder of long cantilevers and variable sections, the box girder is 26.5m wide. The cantilever of girder is 5.75m wide as to reduce the self-weight of main girder. In the design, the software Dr.Bridge was used to establish the finite element model for the box girder and to carry out the global calculation of the girder lateral calculation. The software ANSYS was used as well to establish the finite element model for the segments of the main girder and to carry out the analysis of the local stress of the girder. The results of the calculation and analysis indicate that the global structure of the bridge is safe and reliable and the structure can meet the requirements for highway vehicle riding safety and comfort. No significant local stress concentration appears in the main girder, the stress amplitude values of the stay cables are within 30Mpa, and the structure can meet the requirements for durability in the process of service of the bridge. With long cantilever design greatly reduce the self-weight of main girder and saving cost, at the same time make the bridge look lighter and beautiful. The results of the analysis provide a reference for analysis on the shear lag effect and lateral calculation of the concrete continuous triple-cell single box girder of long cantilevers and variable sections.
Laws of Bending Force on Railway Bridge
Authors: Cai Dun Jin , Wang Ping , Zhao Dong Feng , Luo Hua Peng
Published: January 2014

Based on the theories of the method of the finite element and the interaction between beam and rail, the common railway bridge: the continuous girder bridge and the simply supported girder bridge as an example, set up the integration of the calculation model of the line-bridge-pier on the continuous welded railway bridge, through the calculation software of Bridge Continuously Welded Rail (BCWR2010), the regular pattern of the effect of the bending force and the regular pattern of the longitudinal displacement distribution of the rail and bridge are analyzed.
Application of Reflectorless Total Station in Bridge Detection and its Accuracy Analysis
Authors: Suo Jun Feng , Liu Dong Dong , Feng Mei Ping , Sun Lei , Yang Lan
Published: January 2014

In order to solve the problem of the linear measurement of arch ring for the detection of bridge,a new method is presented that measures the arch ring using a reflectorless total station on the side of the arch bridge and the detail operations are given. Taking account of weakness of edge suveying using a reflectorless total station,some formulas on the 3d coordinates calculation of the above and down edge of the arch ring based on the arch ring points are deduced.According to the law of error propagation, the accuracy of the X and Z axial coordinates are analysed.It is helpful for calculating lateral and vertical deformation and biridges elevation map that the transformation from free-station coordianates to the birdge axis coordinate by programming using EXCEL software is achieved.The method is used for bridges arch ring axial measurement in Qingcheng town,Yuzhong county,Gansu province,and its deformation is consistent with the measured results of the dial indicator,which satisfies the requirement of bridge detecton accuracy.So it is showed that the method is a good way of linear measuring of bridges arch ring.
Earthquake Damage Investigation Analyses and Suggestions of Buildings Caused by April 20, 2013 Ms 7.0 Lushan Earthquake in Sichuan Province
Authors: Wang Dong Ming , Li Yong Jia , Gao Shu Yi
Published: January 2014

The maximum intensity of Lushan earthquake in Sichuan Province is IX degree and the area of influence regions above VI degree is 18,682 square kilometers, which resulting in a large number of buildings destructed. Based on seismic field data collected from works of damage investigation, loss assessment and intensity survey in the first time, seismic damage phenomena and characteristics as well as damage photographs for different structural types of buildings are summarized and analyzed, and some suggestions are put forward to structure anti-seismic designs.
Reservoir-Induced Seismicity in the Three Gorges Reservoir Area
Authors: Liu Su Mei , Xie Xiang Dong
Published: January 2014

As a region with little or very low level background seismicity, the impoundment of the Three Gorges Reservoir in June 2003 was related to increasing reservoir-induced seismicity. Analysis of the spatial pattern of seismicity showed that a majority of the seismicity was associated with the heavily fractured, deep crustal Jiuwanxi Fault, especially in regions of permeable Carbonate rocks formations. Analysis of the temporal pattern of the seismicity and a comparison with the filling history of the reservoir showed that the frequency and intensity of induced seismicity started at low level accompanying the impoundment of the Three Gorges Reservoir, and then increased with the increasing of water level and decreased thereafter. The amplitude of fluctuation of water level was found to be related to the frequency and intensity of induced seismicity. The pore pressure diffusion plays an important role in reservoir induced seismicity.
Seismic Response Characteristics of Tunnel Entrance during the Propagation of Rayleigh Wave
Authors: Wu Dong , Gao Bo , Shen Yu Sheng
Published: January 2014

During the seismic damage investigation of Wenchuan earthquake, it is found that some of the entrance lining structures, such as that of the Longxi Tunnel, suffered significant pavement blowup, which can be attributed to the effect of Rayleigh wave. Unlike the conventional analysis under shear wave propagating upwards, numerical dynamic analysis under the effect of Rayleigh wave in time domain is much more complicated in practice. In this paper, a practical wave motion input method for three-dimensional Rayleigh wave propagation problems in time domain is proposed and consequently applied in a numerical model to analysis the dynamic response characteristics of tunnel entrance. Desirable simulation result and sufficient accuracy is accomplished with the proposed approach. The particular seismic damage of tunnel entrance that was observed in Longxi tunnel is reproduced successfully in the simulation.
Study on Seismic Safety Evaluation of RCC Gravity Dam Based on Strength
Authors: Wang Shu He , Yuan Ji , Ma Rui Guo , Zhang Ju Bing
Published: January 2014

According to No.3 dam section of Dahuaqiao gravity dam, a three-dimensional finite element model is built by finite element software ANSYS. Mechanics of materials method, response spectrum method and time history analysis method are employed to analyze the strength of the dam section. Results show that the stress of dam toe, dam heel and downstream fold slope are relatively high and stress concentration emerges in those positions. The phenomenon indicates that these areas are vulnerable under the earthquake and precautions must be taken. But under the designed earthquake, the maximum stress of the dam section is below the allowable stress, representing the dam is in a safe state and the strength requirement is satisfied.
Numerical Analysis of Seismic Responses of a Concrete Culvert
Authors: Niu Li Qiang , Luo De Pi
Published: January 2014

A two-dimensional finite differential model is established to find the variation of displacements and stresses of culvert components. The time-history analysis is performed and a wide range of parametric studies are carried out to investigate the influences of height of embankment, ground acceleration and the propagation angle of seismic wave on the responses of the junctions between the culvert components under seismic loads. The results show that the horizontal displacements, the peak values of internal forces under seismic loads increase considerably and nonlinearly with the increases of the height of embankment. The peak values of stresses are sensitive to minor variations of acceleration. And the stresses in the culvert structure are reduced, when the propagation angle of seismic wave increases.
Seismic Analysis of L-Shaped Irregular Plane Frame Structure with Viscous Dampers
Authors: Deng Peng , Li Xin , Dong Wei , Tai Lei
Published: January 2014

L-shaped plane structure in the common buildings cannot meet seismic requirements because of significant torsion. According to the analysis of the vibration characteristics, structural deformation and base shear of irregular L-shaped plane structure under frequent and rare earthquake, four arrangement plans of viscous dampers are proposed to adjust the stiffness of the structure. The layout principles of viscous dampers are obtained by comparing effects of different arrangements such as in the periphery, in the short sides, in the long sides and in both short and long sides.
Study on the Stability Influence Factors of Bedding Slope under the Action of Seismic Load
Authors: Fayou A. , Dong Shi Mao , Fan Ya Hong
Published: January 2014

Taking Magunyan landslide located in Beichuan County as a typical example, the stability influence factors of bedding slopes under the action of seismic load were analyze by using the ANSYS software in this study. The influence factors include excavation, interlayer cohesion and friction coefficient, earthquake magnitude and vibration direction. The related analysis showed that significant influences of excavation existed on the deformation and failure of slopes. And the bedding slopes stability increasing with the interlayer cohesive, the interlayer friction coefficient and earthquake magnitude increases. The analysis also showed that horizontal vibration is the most detrimental on the stability of slopes.
Experimental Study on Seismic Performance of Steel Reinforced Recycled Concrete Column
Authors: Xue Jian Yang , Lin Jian Peng , Ma Hui
Published: January 2014

The pseudo-static tests were carried out on seven steel reinforced recycled concrete columns. The main parameters of specimens were recycled aggregate replacement ratio, axial compression ratio and volumetric stirrup ratio. The results indicate that the incorporation of recycled aggregate doesnt reduce the horizontal bearing capacity, ductility and the energy dissipation capacity of specimens and has little effect on seismic performance. The seismic performance of steel reinforced recycled concrete column decreases significantly in the high axial compression ratio. The ductility, horizontal bearing capacity and the energy dissipation capacity of the steel reinforced recycled concrete column increase with a rise in the volumetric stirrup ratio. This study provides a reference on the application of the steel reinforced recycled concrete column.
Geometrical Non-Linear Analysis of Truss Structures under 3D Seismic Loads
Authors: Jiang Yong , Zhu Jian , Zhang Yan Bin , Zhang Xin
Published: January 2014

The seismic response of space structures has been widely studied in the past few years. It has been shown that space structures behave well under seismic loading. However there has been little attention given to the effects of geometrical non-linearity on the seismic response. In this paper, a double-layer truss model was created by finite element analysis program-Lusas. The analysis process took into account of geometrical non-linearity and a 3D seismic loading obtained from a real earthquake. Time-history method was used to investigate the axial forces and displacements of critical members of the model during the earthquake. The seismic behavior of the model and the effect of non-linearity were finally discussed for further applications and studies.
Analysis of Model Test Data for CFG Group Piles in Permafrost Areas
Authors: Luan Zhao Jian , Xin Qiang , Jia Yan Min
Published: January 2014

In this paper, the author simulates geological conditions of permafrost areas, establi-shes CFG group piles indoor model, observes the pile and frozen soil temperature field, then compares the calculated results of the group piles and frozen soil temperatures under concrete hydration heat effect by using ABAQUS with the measured temperature data, thus determines the applicability of ABAQUS for analysis of CFG group piles temperature in permafrost areas, in order to analyze temperature distribution regularities of group piles and frozen soil under concrete hydration heat effect, thermal perturbation range of CFG group piles in permafrost areas, and effects of different concrete molding temperature on model temperature field.
Seismic Performance Investigation of Different Kinds of Shear Walls
Authors: Zhang Pin Le
Published: January 2014

Shear wall systems are the most commonly used lateral load resisting systems in high seismic zones because they provide significant lateral strength, stiffness, and deformation capacity. The work further investigates the seismic performance of different kinds of shear walls. Classified and brief comments about the seismic performance and the exist drawback of different kinds of shear walls and its application are conducted. Lastly, some useful suggestions and a new structure are proposed for the further research.
Loess Slope Stability Analysis under the Action of Seismic Forces
Authors: Lv Da Wei , Wang Fei , Xu Guan Jun
Published: January 2014

Considering that during the earthquake, the maximum peak of acceleration changing in the process is a random quantity, which cant be regarded as a sign of dynamic motion characteristics. Therefore, in this paper, the root mean square acceleration is employed to calculate the corresponding seismic forces. Then according to the sine curve, seismic forces are loaded on the different layers of slope of loess slope. Giving a comparative study on the safety of the loess slope under the force of the earthquake provides reference for the design of loess slope against earthquake.
The Characteristic of Prestressed Concrete Pier Seismic Crack
Authors: Wang Hui Li , Wang Hong , Qin Si Feng
Published: January 2014

Through three dimensional finite element analyzes, overall cast-in-place prestressed concrete pier seismic crack characteristic is researched. The separation formula finite element model is established by means of bilinear reinforce model and Kent-R.Park concretes model, without considering slip between concretes and. reinforce. It compares and analyzes the seismic crack characteristic between prestressed concrete pier and reinforcement concretes pier. The results show that the prestressed reinforcement can reduce the tensile zone of concrete, put off the appearance of cracks, improved the stiffness of pier, and reduced the top displacement.
Geologic Environment Investigation of Underground Engineer in Chongqing
Authors: Yang Le , Peng Hai You , Hu Bo , Ren Xiu Wen , Xie Xiao Tong , Wen Guang Ju
Published: January 2014

Based on many inquiries, analyses and researches, alternate measures of science and social science are taken in this paper, considering series of geo-environmental effect, and the harmfulness of geological effects in Chongqing main city are analysed. The basic counter measures and managing measures are suggested to treat geo-environmental problems in Chongqing main city so that a long-term plan of city-developing and the objective of a struggle based on real situation are set up. The analytic results are helpful to solve the serious geo-environmental effects, and push forward the study of urban geo-environmental problems of underground engineering in Chongqing.
Numerical Study on Fire Smoke Preventing and Exhausting of Underground Highway Tunnel
Authors: Ning Lei , Xu Shu Hui , Cui Ling Fei , Liu Chang
Published: January 2014

Underground highway is an effective measure to ease the traffic pressure. However, fire in underground highway is of great danger. This work investigated the instantaneous velocity field, gas field and temperature field distribution of the underground highway in case of fire theoretically. The smoke field and temperature field distribution was determined at the safe altitude. The expression of the critical flow velocity in the previous work was verified. The optimal escape time in the fire upstream and downstream is 30s and 90s, respectively. The optimal escape distance in the fire upstream and downstream is 35m and 200m, respectively. The best is to read these instructions and follow the outline of this text.
Study on Eccentric Wear Mechanism of Pick-Shaped Cutter in Soft and Hard Interbedded Formation Tunnel
Authors: Wu Dong Peng , Yang Xin An , He Zhi Si , Cao Li
Published: January 2014

This paper analyzes the stress of the pick-shaped cutter of rotary cutting machine in process of tunnel excavation in soft and hard interbedded formation, results show that the resistance of pick is obviously jumping fluctuations comparing to that of homogeneous formation. When pick transits from cutting hard rock to soft rock, cutting resistance and driving resistance of pick decrease instantaneously, which leads to momentary decreasing of rotation torque. And mud ball is compacted by high impact force of rotary cutting machine when cutting hard rock strata, as a consequence, resistance torque increases. When the sum of resistance torque and starting torque is greater than rotation torque, pick can`t rotate, leading to eccentric wear of pick. At last, this paper puts forward several improvement suggestions.
Research on Nanning No.1 Subway Strata Combination Model and Regionalization
Authors: Zhou Yang , Wang Zhong Hua , Xuan Jia Liang
Published: January 2014

Analyzing and summing up the engineering geological and hydrogeological features of Nanning No.1 6 Subway, types strata combination model are put forward, which combing the first exploration data. Then the URT Line 1 is divided into 5 kinds engineering geology partition. At the same time, all engineering geology partitions engineering characteristic and engineering problem possibly appears are analyzed, drawing a conclusion that these first three types partitions shield tunnel may have more problem in the process of construction.
Read Method for LTD-2100 GPR Data Based on Matlab
Authors: Luo Jian , Xie Zhong Qiu , Huang Wen Chang , Wang Da Gang
Published: January 2014

LTD-2100 type ground penetrating radar has its own unique data storage format, and the acquisition data is stored in lte format. This article explained in detail the data of lte format, especially illustrated and analyzed the header file parts of the radar data in tabular form. With a practical engineering as an example, the application of Matlab achieved a goal to read the ground penetrating radar, create a graphical user interface (GUI) and display the GPR data on graphical user interface. The actual data processing shows the effectiveness and practicality of the processing technologies.
Study on Enclosure Structure and Dewatering Plan for Open Cut Tunnel in the Connection Line between Line 1 and Line 3 of Chengdu Subway
Authors: Zhou Xiao Jun , Liu Jian Guo , Mao Lu Lu
Published: January 2014

On the basis of surrounding environment, including ground geological and hydrogeological condition of a connection line between line 1 and line 3 in Chengdu subway, open cut method is used to build the connection line. The whole line is divided into three sections, shotcrete and bolt support is adopted to maintain the stability of foundation pit by slope excavation, well rotary bored piles are used to support other foundation pit of the connection line. Meanwhile, the designed parameters of dewatering well points for the open cut tunnel are discussed and the anti-buoyancy ability of open cut tunnel is also analyzed in the paper. The purpose of this paper is to lead the design of open cut tunnels in Chengdu cities, including such similar subway tunnels in other cities in the world.
The Synthetical Evaluation of Tunnel Design Considering its Impact on Environment Based on Fuzzy Probability Method
Authors: Li Zong Yang , Feng Yu Han , Li Zong Liang
Published: January 2014

Depended on the fact that so many plans for tunnel design laid much emphasis on its construction process and its short-term cost while ignored the increasing importance of environment now, this article puts forward a synthetical method contains analytic hierarchy process and fuzzy mathematics to evaluate plans for tunnel design with certain indexes including the volume of earth works, carbon emissions, energy consumption and consumption of materials, all of which were taken from the main procedures of the tunnel constrution. In the synthetical evaluation process, the performance on environment of a construction plan was graded into four levels, after the probabilities of four indexes may have on each level was obtained, often by investigation or experience, the final scores of the designs could be calculated with the fuzzy probability method. Further, the designs could be compared.
The Research of Shaoguo Tunnel Failure Characteristics of Triaxial and Acoustic Emission Characteristics
Authors: Zhang Yi Hai , Li Yuan , Zhang Yan
Published: January 2014

This is accomplished by a variety of indoor rock mechanics experiments and experimental sound emission, taking Chengde area of Hebei Province the tunnel rock made of rock as research object to simulate various loading rock failure process. To analysis the data obtained of acoustic emission and Dynamics in the process obtaining the characteristic parameters of rock failure process in order to Monitor and Forecast. Through the three axial compression test and the process of acoustic emission signal acquisition discussed the relation between the mechanical parameters of rock acoustic emission parameters of stress. The characteristic parameters of acoustic emission signals with stress and time change through analyzing the acoustic Emission characteristics of each stage in the process of rock failure provide the basis for the prediction of rock burst.
In Situ Stress Measurement and Surrounding Rock Stability Analysis of the Gaoligong Mountain Tunnel
Authors: Bao Lin Hai
Published: January 2014

Gaoligong Mountain tunnel is the key project in the Dali-Ruili Railway. In order to optimize the design and guide construction, In-situ stress has been conducted in five boreholes using hydraulic fracturing method, the current shallow crustal in-situ stress state at the project area are obtained according to the measurements results, and deep in-situ stress is predicted using lateral pressure coefficient. The test results show that at depths ranging from 299-979m, the maximum horizontal principal stress is 5.33-30.12Mpa, the minimum horizontal principal stress is 4.94-23.11Mpa, the horizontal principal stress reach 30Mpa at maximum the depth of burial, indicating that the engineering stress filed is dominated by horizontal stress. Based on the In-situ stress data and different distinguish methods, rockburst and large deformation are predicted. The results show that In-situ stress magnitude in this area is classified as high level, and the direction of the maximum horizontal stress is NEE, In-situ stress orientation is conductive to stable of the tunnel. When the tunnel passes through the deep-burial and hard rock, the wall rock may happen rockburst; and the large deformation may happen when the tunnel pass through the weak rock. In order to avoid the disadvantage conditions, reasonable excavation method and safety support method should be adopted during tunnel excavating.
Study on Deformation Mechanism of High Stress and Broken Roadway and its Controlling Measures
Authors: Yi Hai Bao , Liu Wei Zhou , Zhang Xi Liang , Yang Hai Tao , Yu Hai Hua , Li Long Fu
Published: January 2014

This paper researched the high press and broken drift deformation mechanism of 1424m filling roadway by theoretical analysis and on-site monitoring. Strengthening rock residual strength by improving roadway pressure contributed to enhancing drift stability. The roadway deformation could be controlled effectively with the method of improving rock self-carrying capacity. The monitoring results showed anchor supporting resistance and reinforcement depth were inadequate. And supporting method was not coordinate with rock deformation, which was the main reason of roadway deformation increasing gradually. Improving bolt pre-stress and increasing the anchoring range are the key to limit roadway deformation. And the support way should provide a greater supporting resistance. It recommends that the combination reinforcing method, "strong prestressed anchor + long cable+ grouting behind the surrounding rock" is appropriate for controlling the drift displacement, and it can save supporting costs 390 yuan per year for per meter drift compared with previous supporting way while reaching the same effect.
Study on Hydraulic Model Test at No. 1 Flood Discharging Tunnel of Hekoucun Reservoir
Authors: Ren Yan Fen , Wu Guo Ying , Zhu Chao
Published: January 2014

Based on hydraulic model test, overflowing capacity, water flow state, flow speed distribution, pressure, fluctuating pressure, downstream erosion of flood discharging tunnel and other parameters while total opening and part opening of No. 1 flood discharging tunnel of Hekoucun Reservoir have been observed. It is indicated in experimental study, water at the contraction section at the end of the sluice chamber gets fierce fluctuation, with spray reaching the tunnel top, and results in great negative pressure on the lateral walls on both ends of the contraction section in the original design scheme. After changing the shape of the transition, flow state has been improved, negative pressure reduced, so the design is adaptable; It is recommended in the test guiding plate can be added on the both sides of the cleaning door so as to reduce water-wing height; Three medium-size piers have been compared with the better pier recommended in the test.
Nondestructive Testing for Support Quality of Tunnel
Authors: Qiao Lan , Cui Ming , Cai Qing Chi
Published: January 2014

A tunnel in Chengde collapsed several times and cracks existed in the second lining. Using non-destructive testing equipment, tunnel support was detected to find out the hidden trouble early. In the section of K16+890~K16+950, the quality of tunnel support was assessed, with GPR and anchor measuring apparatus. In the tunnel, the thickness of composite lining was 25cm, and the second lining was 38cm, both of which met the design requirements. Positive peak method was selected to locate on I beam. The average longitude space of I beam was 127cm, while the design value is 120cm. Many rock bolts was lacked at the right crown. Moreover, the bolts in the haunch did not kept in diamond layout, close to I beam. Through analyzing waveforms of impact-echo, the number of qualified bolts only made up 74 per cent of the total bolts. The large space of I beam led to the lack of holding power. Meanwhile, the disqualified bolts limit the coordination deformation between surrounding rock and support. All the support defects led to tunnel collapse. These tests results demonstrate that NDTcan be used to mitigate the risks of tunnel construction.
Blasting Vibration Damping Design and Effect Analysis in Subway Shaft Construction
Authors: Li Jin Kui , Wang De Jun , Fan Yue Bo
Published: January 2014

Mining method inevitably causes a certain degree of damage on the shaft and surrounding rock, and severe vibration can effect on the ground buildings. The Sectional blasting design was discussed on the base of stratigraphic features, field condition and the nearest distance from surrounding buildings to Cuchun Shaft of Dalian Subway 202 construction which is taken as blasting safety control distance in this paper. The control blasting technology with short footage, weak blasting was put forward to reducing blasting vibration. The ground vibration monitoring was carried through during shaft blasting. Particle vibration velocity was from 0.28 to 1.85 cm/s and main vibration frequency was from 16.97 to 42.24 Hz at different level blasting of the surrounding rock. The monitoring results show the blasting parameters and damping measures can meet requirements of Engineering and standardization of the industry. It can provide the scientific basis and technical support for subway construction damping optimization design.
Sensitivity Analysis of Transient Load for Arch Dam Base on Finite Element Method
Authors: Lu Xue , Su Zhi Min , Wang Feng , Tian Zhi Fang , Zhu Jian Bing
Published: January 2014

Based on theories of finite element method, universal software ANSYS, by use of common software ANSYS as a platform, the influence degrees of transient temperature load and reservoir water load on arch dam stress are analyzed and computed. The result indicates that when the water level is same, the maximum tensile stress on arch dam has a close correlation with the variation of temperature, and the sensitivity of maximum tensile stress of arch dam for water temperature is higher than air temperature. The maximum tensile stress on arch dam does not correlate well with reservoir water level changes when the temperature is same. Through the non-dimensional processing on influencing factors which are temperature load and reservoir water level, the sensitivity of maximum tensile stress on arch dam for reservoir water pressure is higher than temperature load.
EMD in the Research and Application of Deformation Monitoring in Embankment
Authors: Qiu Jian , Chen Ji Jun
Published: January 2014

In this paper, the deformation monitoring of empirical mode decomposition method is applied to the embankment, and accordingly to evaluate dike reinforcement effect. Based on empirical mode decompositionof the endpoint effect makes the decomposition results of distortion, put forward to properly control point by using the window function method.effectively ensure the accuracy of the results of decomposition. Reference for peers and staff.
Some Thoughts on the Construction of Water Conservancy Projectmanagement
Authors: Chen Ji Jun
Published: January 2014

In recent years, along with the state of water conservancy investment increases, more and more water conservancy project started construction, and how to construct the process of rational management, in reaching the target at the same time, to play a good economic efficiency, it is urgent to solve the problem. Based on the current construction of water conservancy project the problems existing in the management of serious analysis, put forward corresponding methods to solve the problems. Reference reference..
Numerical Solution of Pressure Underground Seepage Flow Using a Technique of Curvilinear Boundary-Fitted Coordinates
Authors: Zhao Hong , Wei Wen Li
Published: January 2014

The technique of curvilinear boundary-fitted coordinate system is used for the mathematical model of pressure underground seepage flow and the boundary conditions and the method of solving the transformed equations have been presented. The computing example shows that the computed hydraulic parameters conform to the physical laws. Compared with the finite element method, the presented method need not solve the large matrix equations, and the computer memories and the time for computing are less. The mathematical model is effective for numerical solution of pressure underground seepage flows with complicated boundaries, and can be used in practice hydraulic engineering. Keywords-curvilinear boundary-fitted coordinate, pressure underground seepage flow, mathematical model
Analysis of the Monitoring Information of Cutoff Wall and Foundation Seepage in Xiabandi Hydraulic Engineering
Authors: Song Yu Cai
Published: January 2014

The cut-off wall of Xiabandi project commenced in April 2006, cutoff wall and curtain grouting project were completed in November 2009, monitoring equipments for dam foundation seepage and cutoff wall were installed in June 2009. Through the analyzing of the observational data from 2006 to 2010 and the statistical date of cut-off wall section deflection, the stress and strain values and water level changes during water storage, the characteristics of cut-off wall deformation under construction and in the storage are fully and accurately reflected, while the feedback to guide the construction with the monitoring information has also played an active role.
Study on Comprehensive Assessment Model of Navigational Environment in Port Area
Authors: Weng Jian Jun , Zhou Yang
Published: January 2014

The combination weighting approach of subjective and objective is applied to calculate the weights of each index to evaluate the hazard degree of navigational environment in ports, which can both reflect the opinions of experts in the field truly and utilize the statistical information of sample fully. Based on the weights determination, the distance function modelling is used to make an overall assessment of the navigational environment. According to the application of the model, it is convenient and quick to make a comprehensive assessment of the navigational environment in several ports using this model and the evaluating result is of stability and reliability, which can provide a theoretical basis for the strategy determination of port authorities, maritime administrations and officers on board.
Prediction on Evolution Trend of Different Reaches in Middle of Yangtze River
Authors: Yang Yan Hua , Zhang Ming Jin , Wang Jian Jun
Published: January 2014

It is described herein the general rule complied with by different forms of rivers by calculation of evolution trend of selected typical reaches of Ouchikou, Wakouzi and Yaojian which are appeared in the middle of Yangtze River, representing respectively the straight branch, minor bending branch and bending branch. The evolution for reaches of straight branches are mainly characterized with moving backward of side shoal by washout, increased swing of main flow, becoming shallow of riverbed and displacement of navigation trough. For minor bending branches, they generally have unstable water courses, frequently swinging thalweg, washout on head part and left and right rims of heart shoal and extended downward of deposit at the end. Because of reduced sand content, main courses and branches are in the trend of washout. As for bending branches, it is generally stable because of shore protection projects and the navigation condition is better than other type of river reaches unless there is sharp cutting of protruding side shoals.
Deterioration Identification of Structural Concrete Ground on Residual Bearing Capacities
Authors: Yang Hua Shu , Pu Ying Ju , Yang Yu Lu , Peng Xin Long , Wang Yi , Wang Xue Peng
Published: January 2014

Found on data of accelerated life test, the relationship between outward disease of structural concrete and holistic deterioration of building was analysed. The results indicated that: outward diseases of structural concrete, such as abrasion, scour erosion, and peeling, carbonization etc, are not hypostatic breakage for holistic building, so could not be regarded as the key points of deterioration identification at building. Deterioration appraisement should be focused on detections of engineering indices relating to structural inbeing quality and analyses of multifarious remainder relating to bearing capacity. Only in this way, deterioration degree of structural concrete and efficacious repair indices could be factually incarnated. Ground on testing multifarious bearing capacities, deterioration identification of concrete buildings was founded, and remedy principles corresponding to inbeing deterioration indices were put forward.
Technology for Preventing Seepage and Slide of a Stone Seawall in the Pearl River Estuary
Authors: Zhang Ting , Yang Guang Hua , Li Si Ping , Du Xiu Zhong , Li Chuan
Published: January 2014

The rubble mound seawall to be discussed is built on the silted floor of the Pearl River estuary. To meet the requirements of wave defending, stability and anti-seepage, foundation replacement method was used to enhance its groundsill and geomembrane was laid on the downstream slope for seepage control. However, because the silted floor in the foundation wasnt totally removed in the construction process, settlement deformation occured and the downstream slopes trended to slide down. Furthermore, due to the insufficient back pressure for seepage control, serious leakages and piping appeared on the anti-seepage body. The water leakage phenomenon showed little improvement even after additional cement grouting and plastering on the slope. In this paper, a seepage pressure stick slope reinforcement scheme is proposed to handle this problem. After the reinforcement, the water leakage has been prevented and the safety factors of the seepage and slope meets the safety requirements. The pollution caused by the seepage is also eliminated. The proposed technique can give a good reference to the other seawall reinforcement problems.
Numerical Simulation Study on the Delay of Rockburst Based on Rock Mass Stress Release Rate
Authors: Yao Cheng Lin , Chen Jie , Liu Li Peng
Published: January 2014

Rockburst is a phenomenon of geological hazard due to excavation in brittle rockmass of high in-situ stress which endanger to the engineers and construction equipments with unexpectedly damaged. At present, researchers and engineers mainly concentrate to the requirement of rockburst and whether to arise. Although the delay characteristic of rockburst (DCR) has been realized and recorded, but the knowledge of the mechanism of this feature is insufficient. In the paper, the delay characteristic was researched from the stress release rate (SRR) of the excavation rock mass using the numerical simulation software. Firstly, using the core replacement technique, the relation of the SRR and core modulus reduction (CMR) was determined. Secondly, the mechanism of the DCR was analyzed from the elastic strain energy distribution and the plastic strain energy distribution in the different SRR. Finally, the plastic field shape and range under different SRR was contrasted and analyzed. Conclusions can be drawn as follows: with the increase of CMR value, the SRR shows increase trend in the form of exponent. In the process of excavation, the rockmass elastically deform under the low SRR value. When the SRR value equals certain degree, the portion of rockmass will be plastic field and behind the plastic region there will be arise a elastic strain energy centralized phenomenon. Under the different the SRR value, the field style change to the tension-shear field from the shear field in the rock mass and the rockburst rank obviously different.
Numerical Analysis of the Impact of the Stope Blasting Vibration on Tailings Dam Stability Based on GeoStudio
Authors: Wei Qing Nan , Lv Shu Ran
Published: January 2014

In this paper, based on the establishment of the finite element calculating model, the influence of the blasting vibration to tailings dams stability was analyzed in accordance with actual stope blasting vibration monitoring data. The laws of the blasting vibrations impact on tailings dam stability was reached by importing different vibration amplitude of vibration wave intensity. When the blasting vibration acceleration remained under 0.333g and vibration velocity remained under 17.005cm/s, the coefficient of the healthy tailings dam stability against sliding has a increasing trend with the increase of vibration strength. When the vibration acceleration and the vibration velocity reached the maximum value, the coefficient rapidly decline; But the influence of stope blasting vibration on the stability of the risky tailings dams is more significant. The coefficient of stability against sliding had a straight-line decrease to the risky tailings dams. In Engineering, more than 4 times margin is considered to find the control vibration velocity. The value is 4.25 cm/s. An analysis shows that the effect of blasting vibration on healthy tailings dam stability has two sides. When the blasting vibration intensity remains within control vibration velocity, it can be beneficial to the stability of tailings dam. Otherwise it will be harmful.
Bibliometric Analysis of Achievements on the Dam Safety Monitoring in SCI
Authors: Liu Qiu Shi , Deng Nian Wu , Hu Wei Ling
Published: January 2014

In this work, bibliometric analysis was applied to evaluate global scientific production and developing trend of the dam safety monitoring research through Science Citation Index (SCI) papers with online version published as following aspects: publication outputs, subject categories, countries, institutes, citations, authorship and co-authorship, author key words and co-words analysis. Global literature of the dam safety monitoring research has increased rapidly over the past years and has boosted in recent years. The quantity and quality of papers in P.R. China are in a leading position. There is a very important new finding from the research focus that tailings dam has been adequately studied. With the further development of the dam safety monitoring research, it is presumed that scientists might concentrate mainly on safety prediction and health monitoring instead of simple safety monitoring.
Study on Performance Evaluation for Maritime Control in Inland Complex Waters
Authors: Liu Qing , Zheng Chong
Published: January 2014

In order to grasp the effects of maritime management accurately and improve the maritime control level in complex waters, we should evaluate the performance in maritime sectors. Directing at maritime control problems in complex waters and combining with functions of maritime sectors, this paper established a performance evaluation index system of maritime control in inland complex waters. Based on the cloud model, a synthetic evaluation method is proposed to maritime control performance in inland complex waters. Through analyzing the survey data in Jingzhou River Bridge waters, the result shows that the evaluation model is scientific and feasible. The evaluation method provides a reference for improving the maritime control performance in inland complex waters.
Fuzzy Comprehensive Evaluation of Water Resources Carrying Capacity based on Vague Method
Authors: Hou Guan Yu , Tang De Shan
Published: January 2014

China is a water resource-poor country, in recent years, rapid population growth resulting in water issues have become increasingly prominent. Taking Anhui Province as an example, using fuzzy synthetic evaluation method and combining the analytic hierarchy process evaluation analysis of water resources carrying capacity. Firstly, establishing the evaluation criteria of the index system of regional water resources carrying capacity and individual indicators, calculating evaluation index weight,establishing the weight fuzzy matrix, using Vague set and analytic hierarchy process method to determine the weight vector.Secondly, compositing a fuzzy matrix of weight values after obtaining the value of the weights of the various indicators, calculating the degree of membership, establishing the fuzzy relation matrix, fuzzy subset into a comprehensive evaluation model, and seeking the comprehensive evaluation value .Finally, determining the level of sustainable use of water resources in the specific area based on the principle of maximum degree of membership . After the evaluation are analyzed and compared in order to elaborate the evaluation method is feasible and effective.
Study on Hydraulic Fracturing Affected by Natural Fractures
Authors: Sun Jian Qiu , Ma Tian Hui , Zhang Liao Yuan , Huang Bo , Li Ai Shan
Published: January 2014

It could be seen from the past, process of the promoting progress of human society's tends to demanding for energy.With the advancement of technology development as time goes on, countries spare no effort to develop new energy sources, while also continue digging traditional industrial energy. Since the 1960`s, people in the field of shale gas exploitation has made substantial progress. For the development of new energy storage proposed higher requirements, in order to meet growing energy needs, for geotechnical engineering particularity, from the numerical simulation of hydraulic fracturing start by comparing different stress crack formation in case of carry case, at the conclusion on the basis of experimental results can be applied to specific projects put forward the basic assumptions.
Cnoidal Wave-Induced Seepage Forces on Large Porous Vertical Circular Cylinder Resting on Porous Elastic Seabed
Authors: Huang Hua , Chen Rui Zhi , Li Qi , Zhang Jie Min , Guo Lin
Published: January 2014

The influence of the porosity of the structure on the shallow water wave-Induced seepage force on the bottom of porous vertical circular cylinder resting on porous elastic seabed has been investigated. Based on the shallow water diffracted wave theory and Biot consolidation theory on wave-induced seepage pressure, the analytical solutions to first order cnoidal wave diffraction by porous vertical circular cylinder and wave-induced seepage pressure are obtained by the eigenfunction expansion approach. Numerical results show that cnoidal wave-induced uplift and moment may have same order of magnitude as the horizontal cnoidal wave force and moment , and the body porosity of the structure may lead to a reduction both in direct cnoidal wave forces and in the cnoidal wave induced seepage moment. Compared with Airy wave theory, in certain shallow water conditions, the shallow water wave theory can more effectively reflect wave nonlinearity effect in wave load prediction.