bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis of Parameters Influence on Structure of Continuous Curved Bridge
Authors: Gu Xiang , Xie Shang Ying , Jia Shao Min
Published: January 2014

In the modern urban bridge projects,especially the urban interchange projects and the urban viaduct projects,the long-span curved bridge with the small radius is often inevitably used,considering the transportation under bridges,pipelines and aesthetic factors.This kind of long-span curved bridge with small radius was adopted on the south of Second Ring Road in Chendu of the project of "Two Expressways,Two Extended Roads,Two Ring Roads".The influence,which the change of the parameters on the structure had,was analyzed by using the finite element software of Midas Civil 2010.Then,the parameter which had greatest impact on the inner force of the structure was found.The girder depth is the key parameter in design.
Dynamic Response of Concrete Arch Bridge under Blast Loading
Authors: Qi Xing Jun , Liu Qing , Shang Fang Jian
Published: January 2014

In order to reduce loss of terrorist attacks or accidental explosion accidents to traffic facilities of the state and society, antiknock safety of long-span bridge needs to be further studied. A deck arch bridge calculation model of fluid-structure interaction was established, and explicit dynamic analysis was presented to study the dynamic response of long-span arch bridge under blast loading, and the explosion effect to the overall structure of the bridge was analysed. The results show that the area around explosion center, has local large deformation and heavy damage degree, while a little far region has low deformation and damage degree; When explosives is located on the deck, the damage of blast-impact load on the main arch ring can be neglected, which is advantageous to the late bridge repair work. The results of this article can be provided as important theoretical reference to antiknock and explosion-proof of bridges in the future work.
Influence Analysis of Train Speed on Vibration Responses of Footbridge
Authors: Jiang Li , Liu Jia , Li Shu Jin , Chen Xiao Xue , Du You Fu
Published: January 2014

Influence analysis of train speed on vibration responses of footbridge entrance to platform induced by wind pressure due to main line train have been researched in the paper. With some footbridge as the research background, different wind pressure produced by different train speed acting on the bridge surface simulated by CFD method has been adopted to the bridge, thus influence of train speed on vibration responses of footbridge induced by wind due to main line train are obtained. Simulating results show that the vibration responses of footbridge entrance to platform intense with the increase of train speed.
Study of Sedimentation Speed and Compression Characteristics of Back-Silting Soil from Undersea Immersed Tube Tunnels
Authors: Wei Gang , Qiu Hui Jie , Wang Dong Di
Published: January 2014

The immersed tube tunnels in Yangtze river delta region are affected severely by back-silting. Back-silting is difficult to control during construction and the consequences are hard to evaluate as well. In this study, sedimentation experiment was conducted incorporating back-silting soil solutions with different concentration ratios, and compression tests on the initial sedimentation layers was also conducted based on back-silting soil specimens taken from the back-silting soil sedimentary layers located in the surrounding area of Shenjiamen harbor undersea immersed tube tunnel in Zhoushan City. The undersea back-silting was assessed from the aspect of sedimentation speed and the strength of initial sedimentary layers. Results from the study are essential for further study of back-silting load and the effect of back-silting on settlement.
Numerical Analysis on Dynamic Responses of the Reinforced Concrete Piers under Impact Loads of Mass Objects
Authors: Liu Xiao , Wang Ru Heng , Jia Bin
Published: January 2014

In this paper, based on the drawing of an actual project, the dynamic responses of reinforced concrete piers under impact loads of mass objects were researched by using the finite element analysis software ANSYS/LS-DYNA. A common node separate model was adapted to the dynamic responses. The results indicated that vibration frequency at the top of pier column along the transverse direction was more than that in the impacted position under the action of impact. And after analyzing displacement time history curve and maximum displacement at different parts of pier column, the position with maximum displacement in different working conditions was summarized.
FEM Analysis of Massive Concrete Pile Using of Cooling Pipe in Shahe Bridge
Authors: Sun Jian Cheng , Pang Ya Jing , Zhao Wen Zhong
Published: January 2014

Based on finite element theory,Study on temperatrue field under the using of cooling pipe for massive concrete pile in shahe bridge by using MIDAS/CIVIL.Analysis of various factors effect to the temperature field, stress field and the temperature gradient of massive concrete pile,which included in inlet water temperature and the water flow, proposed the control indicators of cooling pipe design.
The Seismic Response Analysis of Long-Span Cable-Stayed Bridge
Authors: Niu Yong Zhe , Guo Wen Jie , Li Guang Ling , Sun Rui Xin
Published: January 2014

Anti-seismic property was essential in the progress of bridge designing and construction due to destructive power of earthquake disaster and increasing span of bridge. This paper elaborated theory method of analysis, taking five spans continuous cable-stayed bridge which was half floating system as an engineering background, and using method of special finite element analysis to calculating dynamic characteristics and seismic response respectively which also considered longitudinal limit damping and stiffness of cable under longitudinal, transverse, vertical and three-dimensional seismic oscillation. Fundamental frequency of cable-stayed bridge was affected significantly with considering longitudinal limit damping, so connection measures would be determined reasonably in designing and analyzing anti-seismic property of long-span cable-stayed bridge. When response spectrum analysis was adopted, longitudinal and vertical displacement were larger than lateral displacement under longitudinal seismic oscillation, lateral seismic oscillation only affected the structural lateral displacement, and vertical seismic oscillation affected vertical and longitudinal displacement.
Experimental Study on Bearing Behavior of Long Rock Socked Pile with O-Cell Test Method
Authors: Wang You Yuan , Wang Zhan , Sang Deng Feng , Su Lin Wang
Published: January 2014

The O-cell method which was applied on the pile testing was introduced, including the basic principle, test device and test technique. The advantages of O-cell method compared to traditional pile testing method were also illustrated. Based on the project of offshore structure in Mozambique, the O-cell test was performed on the long drilled rock socked pile. The results were converted to the traditional load-settlement curve to analyze the bearing behavior and load transfer characteristics. The regularity of axial force and shaft friction of rock socked pile were also revealed.
Research on Ultimate Load of Highway Prestressed Concrete U-Shaped Continuous Rigid Frame Bridge Based on Nonlinear Finite Method
Authors: Xin Ye , Zhang Jian , Han Xiao Dong , Ying Ma
Published: January 2014

Prestressed concrete U-shaped continuous rigid frame bridge is a kind of highway concrete bridge which consists of deck plate, edge beam and side beam and other parts. Based on solid degenerate shell element and with the help of layered shell element to simulate the concrete and steel, the spatial prestressed effect can be implemented. At the same time, the cracking, yielding and crushing performance of concrete nonlinear change can be described through appropriate criteria. Research results have shown that the calculated data are of good stability and convergence compared with using SOLID65 element in ANSYS. Early load of the prestressed steel has a smaller increase in linear stage and a rapid increase in the later nonlinear stage. The results provide a reliable calculation method of the ultimate bearing capacity of the highway U-shaped prestressed concrete structures.
Study on the Factory Prefabrication Technology of Large-Span Bridges Pier
Authors: Wu Qi He , Qiu Zheng Zhong , Niu Zhao
Published: January 2014

The sea-crossing bridge construction takes orders the design idea of maximization, the factorization, the standardization and the assembly, which pile caps and pier shafts of the non-navigable span are prefabricated at the focus of prefabricated. In the paper, the precast solutions are put forward to pile caps and pier shafts of the non-navigable span, and the key technical problems of all kinds of precast solutions are analyzed. On this basis, the optimal pier factory prefabrication is proposed by the comparison of various schemes, which is carried out about advantages and disadvantages of prefabricated matching accuracy control, factory prefabrication, concrete placing, transport in the precast yard, transport style and the impact on follow-up construction.
Characteristics of EPS Materials and the Application in Road and Bridge Projects
Authors: Luo Yun Hua , Hu Hai Ying , Huang Zhi Xing , Zhang Yu Cheng
Published: January 2014

EPS (Expanded Polystyrene) materials have the features of super light, water resistance, anti-ageing, corrosion resistance and well supporting itself .They are now widely used in civil engineering because of their unique features for its unique characteristics. This paper introduces the properties of EPS and the application of EPS in the road and bridge engineering. The correlation analysis showed that The pressure on the foundation can be greatly reduced by the EPS filling embankment in soft foundation, and the settlement and displacement of the EPS embankment are small and its stability is good. The application of EPS in the embankment of a bridge can solve the bumping problems due to differential settlements of road and bridge. EPSs application can reduce differential settlement in the embankment splicing and strengthen intensity in the embankment splicing, which making the new and old expressway as a union in the road-widening project.
Strong Motion Simulation of the Weihe Basin in Wenchuan Earthquake
Authors: Liu Qi Fang
Published: January 2014

Seismic response of the Weihe basin generated by 5.12 Wenchuan earthquake is simulated by using the spectral-element method and parallel computing technique, considering 3D basin model incorporated with real topography. The wave propagation and the comparison of the synthetic and observed records are studied in detail in this paper. The result shows that appropriate source and detailed basin model and accurate numerical technique can simulate the wavefield and large basin ground motion well.
Energy Dissipation Analysis of Composite Frame Structure with Supplemental Viscous Dampers
Authors: Duan Shao Wei , Huang Wei , Tan Xian
Published: January 2014

With a 10 layer of concrete filled square steel tubular column beam frame structure as the object of study ,discrete structure into multiparticle system and establish a dynamic differential equation,solve this dynamic equation by Newmark -β method .Establish thefinite element model of the structure is based on Sap2000 ,then dynamic elastic-plastic time history analysis are carried out, the research results show that the dynamic characteristics of structure,s story drifts,story shear and acceleration with energy dissipating devices are smaller than the model without energy dissipating devices under different earthquake intensities. the damped effect is considered obvious.
Elastic-Plastic Analysis of Partial Single Long-Span Complex Frame Structure under Rare Earthquake in High Seismic Intensity Zone
Authors: Wang Jian Wen , Liang Fei , Sun Wen Bo
Published: January 2014

The item 6.1.5 in Code for seismic design of buildings(GB50011-2010)[ is for single span frame structure design requirements of regulations. But there may be a partial single long-span frame structure in the actual project. Therefore, it is necessary to study the seismic performance of the structure under rare earthquake, especially in high intensity area. This paper takes a hybrid structure which is in high intensity zone with partial single long-span concrete structures (31m) and the single long-span steel roof as an example, and the seismic performance of partial single long-span structures under rare earthquake is discussed. In the elastic-plastic analysis, reinforcement results of members are automatically merged by VBA program. Material parameters of the Elastic-plastic analysis model are compared to Pseudo-static collapse experiment results of reinforced concrete frame columns and the overall framework in Tsinghua University. Results show that: The partial single long-span frame structure reasonably designed based on the Chinese code can meet the requirement of No Collapsing With Strong Earthquake; The bearing type of the steel roof has certain influence on the inter-story displacement angle of supporting frame structures under rare earthquake.
Inverse Analysis of the Buried Pipeline Foundation Structure Based on the Impact Image Method
Authors: Zhao Li Na , Zhu Xin Min , Feng Shao Kong
Published: January 2014

Combining with specific engineering project, the author has researched the impact image method that was applied on inverse analysis of foundation structure of the buried pipeline. The author has also expounded the theory, method, process and conclusion of the impact image method in the detection of the buried pipelines basis. The results show that, it is a nondestructive testing method with high reliability and accuracy. Using this method, people could make sure whether there are boulders, empty or loose areas. Thus scientific basis could be provided to dispose the defect beneath the buried pipeline.
The Seismic Performance Analysis of Light Steel Story-Adding on Steel Frame
Authors: Chen Hao , Wei Jiu Ping , Wang Tian , Ma Ting Ting
Published: January 2014

It is common for using light steel structure as an upper layer to alter the multi-layer frame structure. But it is easy to form vertical irregular structure of rigid upper and flexible bottom. And the mass, stiffness, period and damping ratio are change after layer-adding. So it should take a holistic analysis of the structure. By using sap2000 to simulate a two-layer steel frame with a portal frame added, the seismic performance was analyzed. The result shows: transfer floor was relatively weak, it requires attention when seismic design; damping ratio has a great influence to seismic, it should been chose reasonably.
Experimental Program of Indoor Model Research about Single Pile Negative Friction
Authors: Chen Chang Liu , Wei Song Qi , Ye Shuai Hua , Liu Yan
Published: January 2014

This article aims to study the influence of negative skin friction resistance of waterishlogged pile foundation, through indoor scale model test of pile foundation in the loess areas. The program involved in the model similar than design, the model groove design, the selection of test materials, the design of the ground soil, the layout of measuring points and the research of load method in the test. Through the experimental study on the reduced scale model, we can deepen the understanding of the action mechanism of negative skin friction resistance of the pile, which could guide the engineering practice and design.
Summary of Seismic Performance of the Frame Structure with Infill-Walls
Authors: Hao Wei Jie , Hu Xing Fu
Published: January 2014

Frame structure with infill-walls has been widely used in China, Many domestic experts and scholars have done a great deal studies on the seismic behavior of infilled frames and theorizes that the infill-walls greatly influences the frame structure on seismic behavior. In this paper, summarized the seismic performance of infilled frames from three aspects: the arrangement and structure of infill walls and their connection with frame beam-column.
Seismic Performance of Medium Thick-Walled Cold-Formed Steel Top-and-Seat Angle Joint
Authors: Peng Zhong , Huang Jun , Dai Shao Bin , Liu Ji Xiong
Published: January 2014

3 medium thick-walled cold-formed steel top-and-seat angle joints were designed. The ABAQUS nonlinear finite element analysis on earthquake resistance behaviors of the joints were conducted under low cyclic loading. The results indicate that the failure processes and failure modes of 3 specimens are basically the same, the destruction of joints derive from buckling deformation of the top-and-seat angle and buckling of the steel beam flanges; the shapes of hysteresis curves of all specimens are obvious pinch together and present spindle, the displacement ductility factors are greater than 5.5, the equivalent viscous damping factors are greater than 0.158, all the specimens possess good energy dissipation capacity. The secant stiffness variations are almost similar, each specimen represents significant degradation. Increase the thickness of angle and diameter of high-strength bolt can improve the mechanical performance of the joints. Increase the bolt diameter, the ductility, energy dissipation capacity and initial stiffness enhance obviously, however, there is no apparent effect while increasing the thickness of angle.
Finite Element Analysis of Earthquake Resistance Behaviors of T-Shaped Concrete-Filled Rectangular Composite Steel Tubular Columns
Authors: Huang Jun , Zhang Yi Chao , Dai Shao Bin
Published: January 2014

By using finite element software ABAQUS, the nonlinear finite element analysis of earthquake resistance behavior of T-shaped concrete-filled rectangular composite steel tubular columns is carried out, furthermore, the analysis results and the corresponding experiment results are compared. The results indicate that the calculated value of ultimate bearing capacity is less than the experimental value, and the results of FEM analysis can match the experiment results better, and thus, it can better reflect the earthquake resistance behaviors of the specimens.
Comparison Analysis of Typical Buildings in North-South Seismic Belt
Authors: Liu Jie Ping , Guo Ning , Zhang Ling Xin
Published: January 2014

In North-south earthquake belt, half of more than Ms 8.0 great earthquakes were centralized since the history records were existed in our country. In order to study the typical buildings in this seismic belt, the seismic damages of the typical buildings occurred during 22 earthquakes in North-south earthquake belt, whose earthquake magnitude were more than Ms 6.0, were organized and analyzed. The seismic damage and its matrix of kinds of buildings belonging to the North-south earthquake belt in different intensities were obtained. The statistic results were obtained by comparison and analysis. According to the results of analysis, the seismic capacity of kinds of typical buildings in this region was provided: reinforced concrete frame structure showed fine seismic capability in all previous earthquake whose seismic damage was the slightest in the real statistics results; secondly were those of masonry and mortised timber frame buildings; the seismic damage of buildings, which was combined with timber frame and soil, stone, brick walls was the most serious.
Analysis of Surrounding Rockmass Stability and Supporting Effect of Underground Caverns of a Power Station
Authors: Yan Yi Zhi , Li Wei Hong , Xiong Chang Xin
Published: January 2014

Stability analysis of surrounding rock mass of Hongping underground caverns are studied by means of numerical simulation using Fast Lagrangian explicit finite difference method. The process of excavation and support are simulated. The pattern of deformation, stress state, and the distribution of plastic areas are analyzed. Finally, the whole stability of surrounding rock mass of underground caverns was evaluated.
Risk Monitoring System for Tunnel Boring Machine and its Application in Risk Prediction and Management
Authors: Jiang Hua , Jiang Yu Sheng , Zhang Jin Xun
Published: January 2014

Parameters monitoring and risk management is more and more important and necessary for Tunnel Boring Machine (TBM) along with strata and environmental conditions are becoming increasingly complex. The accurate and real-time monitoring of TBM construction process is the basis of security for structure, environment and avoiding the engineering accidents. However, almost all existing TBMs only have the functions of data collecting and storing, how to use these data to monitor and evaluate the status of TBM advancing in real-time, as well as realize the functions of risk prediction and management are still a continuous research problems. In this paper, Risk Monitoring System for Tunnel Boring Machine (RMSTC) has been researched and developed to monitor the process of TBM tunneling and manage the construction risks. The engineering practices show that the RMSTC is a safe and credible system which can achieve data transmission, parameters analysis and material consumption statistics in real-time, and it offers a new efficient way for risk recognition, analysis, evaluation, prediction and control.
Analysis of Space-Time Effect for Footage of Tunnel-Type Anchorage by Tunneling Cycle
Authors: Liu Yi , Ji Fu Quan , Chen Pei Shuai
Published: January 2014

This paper introduces a three-dimensional numerical model of simulating the tunneling cycle of tunnel-type anchorage by the large finite element software ABAQUS. With tunneling cycles, the space-time effect for footage is analyzed comparatively, which are between the tunnel in headings and tunnel in foots. There are three parameters for evaluating the construction methods, that contain vertical displacement of tunnel vault, vertical displacement of tunnel invert, and horizontal displacement of tunnel wall. The results show that all the values of the above parameters are in the control. Hence, the construction methods of the engineering are available.
Stability Analysis of Soft Soil Foundation Excavation of Underground Station in Coastal Area of Tianjin
Authors: Zhang Yu Ting , Zuo Dian Jun , Pei Wen Bin , Liu Xiao Qiang
Published: January 2014

The marine sedimentary strata are spread in coastal area of Tianjin. Due to low soil strength, high underground water level and strong soil plasticity flow, instability accidents happened frequently in soft soil area. In the foundation excavation of underground station, because of stress release and change in ground water level, the differential settlement of surrounding buildings, ground crack and deformation of underground pipeline will happen. The stability of surrounding rocks in the foundation excavation of underground station has been calculated and analyzed by using numerical simulation method. The Surrounding soil deformation of foundation pit has been gotten to analyze.
Tunnel Seismic Prediction (TSP) and its Application in Tunnel Engineering
Authors: Lin Chun Jin , Li Shu Cai
Published: January 2014

In order to avoid heavy casualties and economic losses, and to get an insight into engineering and hydrogeological conditions, Tunnel Seismic Prediction (TSP) method is applied for advanced geological prediction in tunnel engineering. Basic principle, data analysis method, prediction criterion of TSP are studied. Seismic reflection characteristics of karst caves and fractured zones are analyzed and demonstrated in Qiyueshan Tunnel. Results indicate that TSP is sensitive to karst caves and fractured zones, but may have errors in location. The location of the prediction results should be checked with comprehensive geological prediction methods. In some extent, research of the prediction principles and engineering application in the present study is instructive for further applications.
Mechanical Analysis of Shell Structure in Longwall Mining Face of Steeply Dipping Seam
Authors: Ren Shi Guang , Wu Yong Ping , Xie Pan Shi
Published: January 2014

Taking the longwall mining face area in steeply dipping seam as the research object, the stability of asymmetrical rock mass structure is analyzed using shell theory and masonry beam theory. The results show that asymmetrical shell structure is formed at the top strata of mining stope and its magnitude is mainly determined by the mechanical characteristic of overburden strata of working face, mining space size and so on. Localized instability of the shell structure is the main factor that leads to the overall structural instability in the stope. The instability modes includes: the shell roof instability dominated by tensile failure, shell shoulder instability initialized by compression-shear failure, and shell bases composite instability occurs in tensile and compression-shear modes. The shell structure stability dedicates rational strata control measures to choose, and the caving height of overburden strata is the key for shell structure instability.
Numerical Analysis of the Impact of Intensive Underground Structures on Groundwater Flow in Guangzhou (Canton), China
Authors: Luo Guanyong , Cao Hong , Pan Hong
Published: January 2014

The soil over the bedrock in the city of Guangzhou is thin, with a depth of only about 11 m. Under such conditions, excessive exploitation of the underground space is very likely to affect the groundwater environment. In this paper, the impact of intensive underground structures, which act as barriers, on the groundwater flow in Guangzhou is investigated. The emphasis is on the impacts in terms of hydraulic head, Darcy velocity and groundwater balance. The study finds that: (1) Under the current underground structure density, the impact on the hydraulic head is small, and most of the change is in the range of ±0.5 m. (2) The Darcy velocity appears to be more susceptible to being affected by the structures. (3) The barrier effect of the intensive structures increases the overflow at the foot of the hills and reduces the transmissivity of the aquifer.
Research on Interval Shield Construction Monitoring
Authors: Gui Fang Ru
Published: January 2014

According to the relationship of tunnel depth, the foundation forms of adjacent building (structures), the importance and the location of the tunnel in Nanjing Metro Line 3, the formation properties of the site is combined to carry out the analysis of key and difficult points on the worksite monitoring objects, the implementation methods of the interval shield monitoring is studied, which provides reference for similar engineering projects.
Numerical Analysis of Characteristics of Moisture Migration in Soil Slope under Rainfall
Authors: Wen Guang Ju , Deng Wen Jie , Wen Feng
Published: January 2014

Based on the characteristics of slope failure induced by rainfall, from the point of view of moisture migration and combining unsaturated soil mechanics, the characteristics of moisture migration in slope under different rainfall intensities were analyzed by finite element method. The results reveal that under rainfall, the pore water pressure in slope is in layered distribution, and at the bottom of slope, the pore water pressure is the highest, the top is lower and the middle is the lowest. The volumetric water content is in nonlinear distribution and the degree of nonlinear in unsaturated area is higher than that of the saturated area. The permeability coefficient of soil rises with the increase of rainfall intensity, and when the soil is saturated, its permeability coefficient is saturate permeability coefficient.
Experimental Analyze of Blasting Effects on Dry-Beach in Abandoned Tailings Dam
Authors: Mu Gui Qing , Wang Ji Fei , Lv Shu Ran
Published: January 2014

In order to study liquefaction and failure law of the tailings under the action of blasting vibration, series blasting experiments were done in dry beaches of a small abandoned tailings dam. The explosives was buried in the tailings dry beach face, blasting created blasting crater and arc shaped cracks, and accompanied by sand boil and water eruption. By installing blasting vibration velocity and acceleration sensors on tailings dam dry beach to measure corresponding blasting vibration velocity and acceleration, regression analyses on experimental data, the blasting vibration velocity and acceleration which can cause tailings sand liquefaction and damage are respectively 23.94cm/s and 4.38m/s2.
Study of Realizing Deep-Sea Erection Technology by Pioneering Dike
Authors: Zhang Li Xin , Zhang Li Hua , Cheng Pei Hua
Published: January 2014

For deep-sea diking engineering, the water is deep, wave is high and stream is torrential in the erection stage, so the construction difficulty is very high. In this paper, the authors prove the feasibility of realizing the deep-sea erection by the pioneering dike from aspects of structure of the pioneering dike, construction equipments and operation procedures, etc., utilizing features of the pioneering dike, such as small body, flexible and fast construction, and capacity to fully utilize the conditions of falling tide.
Research on Simulation Technique of Shoal Protection Works in Middle and Lower Reaches of Yangtze River
Authors: Liu Xiao Fei
Published: January 2014

The shoal protection works in the middle and lower Yangtze River is divided three types, i.e. riprap in bulk, dam body and soft mattress. As a new kind of shoal protection works, because the application time is very short, therefore the beach protection effect and the improvement measure have not thorough researched. In order to better apply to channel regulation project, the simulation technique of the X-type flexible mattress is thorough researched, the aspects of geometry similarity, gravity similarity, plan layout similarity and river bed deformation similarity are solved, the physical simulation technology problem is realized.
Three-Dimensional Flow Structures and Suspended-Sediment Transport in the Dam Area of Large Reservoir
Authors: Jia Dong Dong , Zhou Jian Yin , Shao Xue Jun , Zhang Xi Bao
Published: January 2014

The three-dimensional (3-D) flow structures and suspended-load sediment transport processes in the dam area of the Three Gorges Project (TGP) with large water depth were simulated by a 3-D mathematical model. The characteristics of flow structures and suspended-load concentration distribution were analyzed based on the simulated results. Strong 3-D features of flow structures can be found in the dam area, the secondary currents are significant. The suspended-load sediment concentration reduced much faster in wider valley areas, where deposits accumulated. Due to impact of secondary currents, the maximum concentration of suspended-load occurs at the convex side while the minimum at the concave side. It demonstrates that the 3-D numerical modeling is a useful prediction technique and research tool to enhance our understanding of flow structures and mass transport processes in natural rivers with complex boundary.
Research on Riverbank Protection Measures of Daijiazhou Reach in Middle Yangtze River
Authors: Liu Wan Li
Published: January 2014

It is analyzed herein of collapsing character of Daijiazhou river reach, the bank shoring in the lower reach of Yangtze River and their adaptability and the summary on the bank shoring experiences thereof. The type of bank shoring suitable for river reach of Daijiazhou is recommended accordingly depending on the features of Daijiazhou river reach. In consideration of long bank slope and complicated water flow, terrain, geology, etc. in the around area, a combined method of bank shoring characterized with different bank shoring structure applied to the different position of the same bank slope has been put forward based on the overall analysis so as to reach expected effect of the projects with ensured stable structure.
Algorithm Comparison on Optimal Daily Operation Model of Multiple Pump Units with Adjustable-Blade for Single Pumping Station
Authors: Gong Yi , Huangfu Quan Huan
Published: January 2014

The mathematical model of optimal daily operation for multiple pump units with adjustable-blade in single pumping station was solved by means of decomposition-dynamic programming aggregation method and experimental optimization method while the peak-valley electricity price was taken into consideration. After taking No.4 Huaian Pumping Station as a study case, a series of optimal operation schemes under different average daily heads and water pumping loads were obtained. Based on the analysis of optimization benefits, the applicability comparison of two optimal algorithms have been carried out, by which the application scope of each algorithm was proposed.
Study on the New Determined Method of Profile Inversion of Polymer Flooding
Authors: Shu Sheng Jian , He Jin Gang , Yang Jing , Wang Wei Nan , Dong Xiu Long
Published: January 2014

Inversion happened in reservoir water injection profile is a bad phenomenon for enhance oil recovery, understanding the mechanism of profile inversion could provide theoretical basis for administer profile inversion. The calculation method of dynamic RF was deduced by Darcy's law, and indoor core physical simulation experiment in parallel at the same time. The results show that profile inversion lies on the different patterns of dynamic RF of polymer solution in the high and low permeable core. In the low permeable core, RF rises in the index form, while RF rises in the logarithm form in the high permeable core. In the low permeable core, the changing rate of RF continuously increases, while the changing rate of RF decreases constantly in the high permeable core. When those are equal, the water injection profile begins to invert. In this paper, a new method to predict profile inversion was sought out.
Research on Appropriate Content of Super Absorbent Polymer Added of Marine Concrete
Authors: Xing Shuang Jun , Fan Hai Chao , Zheng Jun , Guan Bin Jun
Published: January 2014

Through the mechanical properties experiments and analyses of ordinary marine concrete and marine concrete with fly ash added, it was thought that the proper content of SAP added could release free water for cement particles to continue hydrating during the curing stage, guarantee adequate water. So, SAP could significantly improve the performances of marine concrete. As to marine concrete with fly ash added, because part of fly ash took part in hydration process of cement particles and another part filled in gap structure of concrete, the appropriate content of SAP added was different from ordinary marine concrete and it should be according to the amount of fly ash added.
Numerical Simulation of Tidal Current and Sediment for the Secondary Diaoliang Reclamation in Zhoushan
Authors: Wu Hui Qin , Hu Jia Xiang , Pan Xi Shan
Published: January 2014

Based on the 2-D tidal current and sediment model, the field of tidal current near the sea of the secondary Diaoliang reclamation in Zhoushan was simulated due to the construction of the southern dike. After the simulation , the result was varified by the measured data .The impact on the surrounding sea and the annual change in erosion and deposition after the project was analyzed. The results show that the local current velocity in the eastern side of Luomen sea area features obviously decrease because of the reclamation project.The deposition is presented in the Diaoliang bay with the mean siltation intensity of around 0.8m/a, as well as about 1.1m/a of Luomen wharf apron .
Application of Artificial Neural Network in GPS Height Transformation
Authors: Fu Bo , Liu Xiang
Published: January 2014

GPS technology has been widely used since it was put into use. At present, the plane locational accuracy of GPS can already achieve millimeter level. But in terms of height, in order to apply the GPS ellipsoidal height in engineering practice, the geoid seperation or height anomaly of the corresponding point must be achieved to transform GPS geodetic height to normal height. In this paper, by taking 12 points from the national GPS control network of Xuxiang Village of Haining City as sample data, a BP neural network using 3-4-2-1 model structure is adopted and a nonlinear coefficient 1.1 is added in the response function. The height anomalies of the 5 points of the test set are calculated and the residual errors are achieved by comparing with the measured values. The internal and external coincidence accuracies of the model are 0.824cm and 0.922cm separately. The result shows that the model can completely meet the precision requirement of the fourth-grade leveling survey and can be used to transform the heights of the study area.
Numerical Simulation of Pile Foundations of Qinghai-Tibet Power Transmission Line: Influence of Temperature Region
Authors: Chen Lin , Yu Wen Bing , Liu Wei Bo , Yi Xin
Published: January 2014

To analyze the thermal effect of the pile foundation of permafrost, a two-dimensional transient finite element model of the thermal fields with phase change were established. The developments of heat influence limit and maximum thawed depth with and without climate warming were predicted and analyzed. Results indicate that (1) the heat influence limit and maximum thaw depth in permafrost regions enlarge with time elapse, while the global climate warming will have a greater influence to full-space pile foundation compared with the cone-cylinder pile foundation; (2) Considering the global climate warming, heat influence limit (Lmax) and maximum thaw depth (Hmax) in 50th year for full-space pile foundation, cone-cylinder pile foundation are 10.1m, 5.2m, 4.1m, 3.7m, respectively; the maximum thaw depth of full-space pile foundation during the operation will have exceeded the depth of structure (2.5m), which might put the structure at risk; (3) the structure of cone-cylinder pile foundation could effectively preserve permafrost and avoid pile foundations failure; (4) the spacing of cone-cylinder pile foundations is reasonable and the interaction of temperature distribution among cone-cylinder pile foundations can be negligible.
Research on the Construction Quality Control of Unbonded Prestressed Concrete
Authors: Jin Guo Hui , Niu Xiao Dan , Wang Xiao Li
Published: January 2014

On account of unbonded prestressed concrete construction technology is a high demand specialized, strict operation, high technical content job [, so the construction quality control study of unbonded prestressed concrete play a vital role to the quality of the structure construction, impact the quality of the whole project. In view of this, this paper analysis and inductive the main point of it from three stages: before, under and after the construction, expect to play a role of reference and guidance to the engineering practice.
Discussion on Construction Technology and Safety Management of High Formwork
Authors: Zhao Yu Hong
Published: January 2014

Through aspects of 19.650m high formwork construction preparation, installation, removal, quality standards, safety technical measures introduced during construction of tall security formwork.
An Experimental Research on Wall Radiant Cooling and Wall-Attached-Jet Air-Conditioning System
Authors: Kong Xiang Lei , Zi Xin Li , Yun Long , Zhang Xiao Song
Published: January 2014

Taking the radiant cooling combined with wall-attached-jet air-conditioning system as the subject in a laboratory of Jiangsu university, an experimental study was carried out on pre-dehumidifying period, stable operation period and system shutdown period, along with analysis. The objective is to analyze the pre-dehumidification of the system, indoor air temperature and humidification change, vertical temperature profile and condensation sensitivity. The results show that the hybrid air-conditioning can provide high thermal comfort and avoid condensation effectively, which shows the better performance compared to the system of radiant cooling combined with displacement ventilation to some extent.
Numerical Simulation on Adding Chamfer Angle of Direct Air Cooling Exhausted Duct for Large Thermal Power Generator
Authors: Wang Chun Qing , Bian Cai Xia
Published: January 2014

The optimal design for exhausted ducting mode and internal structure in direct cooling exhausted duct system influence every steam to assign the flow obstruction and flow while managing to assign directly.The flowing filed of steam in direct air cooling exhausted duct for 1000MW power generating unit is simulated via Computational Fluid Dynamics(CFD) software under typical steam turbine conditions,and the best chamfer angle can be get by adding different chamfer angles in back of exhaust pipe.The result shows that the steam flows through each distribution pipe with balanced flow under the condition of chamfer angle of 30 °and the flow resistance is much lower than before
Factors Affecting Urea Granulation Tower Simplification of Ventilation
Authors: Wang Li Li , Wu Guo Zhong , Li Dong
Published: January 2014

Currently, most of the domestic fertilizer unit, granulation tower basically using natural ventilation, granulation tower granulation process is ejected molten urine through the nozzle to cool down after melt crystallization (phase transition), cooling 3 process[1]. The beginning step is cooling stage of liquid urea. The second step is liquid urea into solid urea particles. The last step is solid urea paticles cooling process with long drop distance. In the process of landing urea crystals, the releasing heat is taken into the cold air. The average air rate of natural ventilation in the tower is 0.4-0.8m/s. And the air rate of mechanical ventilation prilling tower is 0.6-1.2m/s. Landing time of urea particles from nozzle to Scraper is about 5-10m/s.
Testing and Analysis of Bearing Capacity on Pile Foundation
Authors: Zhu Yan Peng , Bao Ze Xue , Ma Tian Zhong , Lai Chun Jing
Published: January 2014

The application of pile foundation is promoted by the rapid development of the high speed railway, highway, high-rise buildings and big volume weight of building. However, the static load test and low strain test play a very important role in pile foundation inspection and ensurement of the quality of pile foundation engineering. In this paper, combined with the engineering of the basis of a hospital in lanhou, the author analyzed the results of 7 test piles static load test and a large number of low strain test and summarised pile testing contents and methods. At the same time,the bearing capacity of anchor pile in static load test is discussed.
Assembly Blast Walls and Concrete Blast Walls Comparative Analysis of Protective Effectiveness
Authors: Li Zhi Zhong , Tang De Gao , Li Wei Wei , Yan Zhi Fang
Published: January 2014

To reduce the terrorist bombings and the occasional blast damage to people and buildings, a style of steel-sandstone-steel assembly blast walls was designed. To analysis the protective effectiveness of blast walls against the blast wave, The concept of overpressure Protective effects coefficient was proposed. The computational model of assembly blast walls was Established and three-dimensional numerical simulation for the assembly blast walls by using ALE and JWL state equation for the product of explosive detonation was Carried out. Empirical formula calculation results and the test results in the Ref are in good agreement. Using this model the protective effects for blast walls of steel plate with sand, blast walls of steel plate with concrete,concrete blast walls and was studied by 3D numerical simulation. The analyses indicate that protective effectiveness of steel-sandstone-steel blast walls was better than the concrete blast walls and the steel-concrete-steel blast walls.
Study on the Technology of Stabilization of Sands Using Aeolian Sand Bag in the Desert Area
Authors: Sun Guang Li , Xin Qiang , Zhang Hong , Luo Jun Bao
Published: January 2014

Based on "controlling sand to fix sand, managing sand with sand", aiming to the problems of sand hazard in the northwest desert area during the highway construction, the new technique of sand fixation is formed by bags of using widely distributed desert aeolian sand. The flow field characteristics of aeolian sand barrier with fins & nofins are analyzed by wind tunnel tests, the influence of sand barrier forms and specifications to wind speed reduction ratio and roughness are researched by field tests as well as sand fixation effect, the results can provide the guidance and application value to sand fixation engineer of the desert areas
Research on Accident Control Based on HSE Management System in Petrochemical Enterprises
Authors: Li Fei , Zhang Guang
Published: January 2014

Through the discussion on the nature of the reasons for the accident, it is easy to analyze that the management faults are a source of accidents, and extract the concept of HSE management system in petrochemical enterprises, which as a dynamic security management system, in view of the "all accidents are avoidable" concept, implements security affairs management by the means of planning, implementation, leadership and monitoring, and finally, illustrates that HSE management system realize the whole process management of accident control though examples in drilling operations.
Inspection and Assessment of Urban Gas Pipeline Based on Risk Analysis
Authors: Lu Jiang , Wang Yi Ning , Zheng Yang Yan , Li Ji Chun
Published: January 2014

In this paper a process framework was constructed for the inspection and assessment of urban gas pipeline. Take a certain gas pipeline network as an example, work directory for complete inspection was established as well as models for risk assessment. Feasible and effective rectification measures could be taken according to the relative importance of the results of the inspection and assessment. Some work in this paper could be adopted for the inspection and assessment of urban gas pipeline.
A Computational Study on Structural Barrier to Vertical Spread of Window Spill Plume along Building Exterior Façade under External Wind
Authors: Zhao Nan , Zhang Jing Yan , Xing Xue Fei
Published: January 2014

External wind is one of the major factors that influence the spread of fire along building exterior facade in high-rise buildings. Fire simulation experiments are conducted .First, under two circumstances of low-speed and high-speed side-blown wind, observing barrier of window spill plume along building exterior facade under different dimensions of windows, windowsill walls and balconies. Then the correlation between smoke temperature near the exterior facade and dimensions of window, windowsill wall and balcony is obtained by numerical fitting and dimensional analyses. The correlation indicates that, on low-speed side-blown wind, spill plume spreading diagonal up downwind, balcony width plays a leading barrier; on high-speed side-blown wind, spill plume horizontal spreading downwind, balcony extension plays a leading barrier.