bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on the Construction Technique of Super-Large Diameter Rock-Socketed Piles in Karst Areas
Authors: Xing Hao Feng , Meng Ming Hui , Long Wan Xue , Ye Guan Bao , He Wen Yong
Published: February 2012

It is difficult for the large diameter pile to bore the hole and ensure its quality under the complicated geological condition in karst areas. In order to get the feasible construction method, the construction technique of super-large diameter rock-socketed piles in karst areas was explored in this paper on the basis of Hezhang Super Maior Bridge project in Guizhou province. The adaptability of the construction plan at this site was expounded firstly; and then the technologies for dealing with the problems of buried hammer, inclined hole, slurry leakage, which often occur during the process of boring pile hole under complicated geological conditions, were deeply researched. The research results show that it is effective to use the slurry with the relative density of 1.30 to 1.35 to prevent the pebble soil layer from collapsing, to prevent the pile hole from inclining by backfilling rubble in tilted stratum, to treat the slurry leakage problem by backfilling rubble, clay soil and bagged cement; and to handle the hammer stuck through the skills of underwater blasting, salvaging with pothook and light pounding with small hammer. It is proved that the method of light pounding with small hammer is preferable to handle the stuck hammer occured in backfill hole. The study provides the theoretical guidance and reference for similar projects.
Study on Pore Water Pressure Model of Soft Clay
Authors: Zhang Yong , Wan Li , Huang Yang , Fu Jia
Published: February 2012

Based on the consolidated undrained triaxial test of soft clay, a formula for computing pore water pressure is developed, by using of the critical state theory of volume strain and the characteristic normalization of soft clay. It is shown that the new proposed formula is reasonable to reveal the nonlinear stress-strain relationship and the dilatancy characteristics of soft clay. With the comparison between the pore water pressure simulation results by the new formula and the experimental data, it is shown that the simulation values agree well with the experimental data. Meanwhile, based on the failure criterion, a formula for the critical pore water pressure is proposed. It is shown that the new formula is reasonable to simulate the critical pore water pressure. It is very useful to predict the foundation stability.
Study on the Influencing Factors of Deflection-Span Ratio under Standard Load in Prestressed Concrete Hollow Slab
Authors: Cui Xiu Qin , Guo Bing , He Yan
Published: February 2012

The numerical analysis method is applied to simulate the whole process of bending. Keeping the section dimensions and the types of loads constant in prestressed concrete hollow slab with mid-strength spiral-rib steel wire, strength of concrete, strength of steel bar, reinforcement ratio, span-depth ratio and stretching control stress are analyzed and compared. The influence of strength of concrete, strength of steel bar, reinforcement ratio, span-depth ratio and stretching control stress on deflection-span ratio under standard load of prestressed concrete hollow slab is discussed by numerical simulation.
Strength Reduction Technique for Non-Linear Failure Criterion
Authors: Ren Li , Ai Ting , Zhu Zhe Ming , Xie Ling Zhi , Zhang Ru
Published: February 2012

In the analysis of slope stability, a reduction method of non-linear shear strength was applied. A power function was used to approximate the shear failure envelope which is determined by the non-linear criterion or experimental data, and then the coefficients of that function were determined by using the collocation points. The equivalent friction angles and cohesive strengths of rock as well as stress range were determined by fitting an average linear relationship to the approximate curve generated by the power function through the method of least square. Finally, an example was presented to demonstrate the superiority and feasibility of the method introduced in this paper.
Statistical Analysis of Deep In Situ Stresses Field Characteristic in Huainan Mining Area
Authors: Cai Hai Bing , Cheng Hua , Wang Chang Bo
Published: February 2012

Based on deep in-situ stresses measurement data in new and old mines of Huainan mining area, in-situ stresses characteristic is researched by statistical analysis with multiple methods. Research results indicate that in-situ stresses of deep rock mass in Huainan mining area are located at high level. Scatter plots of vertical stresses, horizontal principal stresses and lateral pressure ratios variation with depth are presented, then, respective regression equation is obtained. The statistical results are helpful to finding out macroscopical characteristic of deep in-situ stresses field in Huainan mining area. The research results can also provide important reference frame for design and computation of underground caverns in Huainan mining area.
Research on Supporting Technology of Roadway Driving along Next Goaf of Second Mining Strip Pillar
Authors: Lv Wei Dong , Zhao Nan Nan
Published: February 2012

For roadway driving along next goaf of strip pillar second mining, being influenced by the abutment pressure of previous coal mining face and main roof breaking rotary deformation, the surrounding rock deformation is serious and the control effect of ordinary bolt supporting on the general stability of roadway driving along next goaf is poorer. According to the concrete geological and technique condition of the 2351 second mining strip pillar in Daizhuang Colliery, adopting the united support pattern combined high strength bolt of levorotatory continuous thread and anchor of low relaxation prestress, the safety of the roadway can be ensured and the stability of the roadway surrounding rocks can be improved. It is of significant reference meaning for bolting support of roadway driving along next goaf of second mining strip pillar under similar condition.
Behavior of Cemented Reticulate Red Clay
Authors: Li Jian Zhong , Zhuo Li Chun , Ni Xi
Published: February 2012

Mechanical properties of cemented reticulate red clay were studied in present research. Test results show that: (1) shear strength of cemented reticulate red clay increase exponentially as the increasing of cement content; (2) shear strength of cemented reticulate red clay decrease polynomially as the increasing of water content; (3) mechanical properties of cemented reticulate red clay affected significantly by curing time and curing confined pressure. In order to study viscous properties of cemented reticulate red clay, cemented reticulate red clay specimens were compressed in triaxial chamber at different shear rate. Results of the compression tests show that it is obvious that the axial strain-deviator stress relationship of cemented reticulate red clay affects by the strain rate.
Numerical Analysis of MMP Piling with Wet-Jetting Method
Authors: Chen Yao Yao , Sun De An
Published: February 2012

MMP pile is a method of foundation treatment, and driving pile brings the excess pore water pressure in the surrounding subgrade. By using a software ABAQUS to build a three-dimensional model, the process of MMP pile driven at a site of railway foundation in Shanghai is simulated using theory of Biot consolidation and modified Cam-clay model with three-dimension effect being considered. The changes in the excess pore pressure are obtained. Comparing the computed results with measured results in situ shows that the computed excess pore water pressure is consistency with that measured from in situ.
Analysis on Orthogonal Test of L-Shaped Concrete-Filled Rectangular Composite Steel Tubular Columns
Authors: Huang Jun , Dai Shao Bin , Peng Zhong
Published: February 2012

Through orthogonal test, the main influencing factors to the ultimate bearing capacity, ductility and energy consuming ability of L-shaped concrete-filled rectangular composite steel tubular columns are studied. Research results show as follows: the most important factor in deciding the ultimate bearing capacity is the steel tube wall thickness; the most important factor in deciding the ductility factor is the steel tube wall thickness; the most important factor in deciding the equivalent viscous damping coefficient is the strength classes of concrete. At the same time the best level combination of these factors are got.
General Slice Method Based on Rigorous Equilibrium to Solve the Factor of Safety
Authors: Yang Ming Cheng
Published: February 2012

For a general slice, force and moment equilibrium equations are developed, the recurrence equations of inter-slice force and inter-slice moment are derived, the general formulation based on rigorous equilibrium to solve the factor of safety is studied, hence, the theoretical framework of rigorous method of general slice is developed, rigorous method of vertical slice is a special case of it. Analyzing the applicability of Sarma’s method, two new inter-slice shear force equations are presented based on the compatible relationship among slice’s displacements by leading in the scaling parameter λ and inter-slice force function f(x),hey make the relationship between the inter-slice shear forces and slip surface geometry clear, and indicate that the reduction factor for shear strength along inter-slice boundaries varies from one boundary to the next depending on the geometry of the slices and the slip surface. The rigorous methods of general slice can be developed based on the modified inter-slice shear force equations, they think that the reduction factor for shear strength along inter-slice boundary is different from that for shear strength along slip surface. The example analysis indicates that the proposed new methods work better than Sarma’s method, the reasonable value of safety factor can be obtained by using them. Even if the shape of slice is varied, the proposed new methods can also give consistent values of safety factor and ensure that the iteration is stably convergent.
Numerical Simulation of Geostress and Support of Roadway Crossing Strata in Complex Stress Condition
Authors: Wang Tong Xu , Li Lai Yuan , Zheng Wen Hai , Liu Yang , Hou Tao , Qu Hong Yuan
Published: February 2012

Affected by a group of underground chambers and gobs of working faces, the track sub-inclined shaft of 430 mining area in Geting coal mine, which crosses coal seam and faults repetitively, lies in high and complex stress environment. Based on geostress results measured in the field, FLAC3D numerical simulation software was used to simulate the regional geostress in the area near the roadway, referring to the impact of the gobs and chambers. And the stress variation law along the roadway was given at last. Then the roadway roof structure zone chart was drawn according to the detection results with the rock video detection recorder. Finally, stability of different sections of the roadway and the support advice corresponding to each section was gained. The results show that comprehensive consideration of geostress variation law and surrounding rock structure is necessary in the stability classification and the support of roadways. The research methods and ideas given in this paper is feasible.
Effect of U-Bracket on the Structural Performance of Cold-Formed Steel Angle Connection
Authors: Adeline Ng Ling Ying , Chee Chiang Mei
Published: February 2012

The paper presents an experimental investigation on the structural performance of high strength cold-formed steel angle connection stiffened with U-bracket. A total of 18 sets of specimens were tested using different U-bracket configurations. The parameters of the U-bracket studied were the width of the web and the length of the flanges. The behaviour of the connection under load was observed and the failure mode of the connection was identified. It was shown that biaxial deformation occurred in the U-bracket. It was also demonstrated that the capacity of the connection of angle and U-bracket was 4 times the capacity of plain angles. Results showed that it was more conservative to estimate the strength of the connection by taking the total elastic capacity of the sections. It was more effective to use U-bracket with a 40mm web and 15mm long flanges with the 50mm width angle connection.
Use of PFC2D for Simulation of Triaxial Compression Test for Reinforced Earth and Analysis of Sand Particle’s Movement
Authors: Liu Wen Bai , Su Li Juan , Chen Zi Yi , Jiang Hong Ming
Published: February 2012

The simulation of triaxial compression test for reinforced earth is carried out under application of the numerical analysis software PFC2D. Several groups of reinforced earth samples are tested by simulation under same enclosed pressure but different arrangement of reinforcement and vice versa in the state of shear failure and the results of the test is compared with that from macroscopic experiment. The test shows that reinforcement in earth mass leads to remarkable improvement in shear strength and inhibition of movement of particles around reinforcement medium. The tendency of motion between particles grows as enclosed pressure rises but decreases with the increase of reinforcement layer in number. The reinforcement constrains the lateral deformation of sand sample and enhances shear strength. And the effect of enhancement caused by three-layer reinforcement is remarkably better than that by one-layer. Besides if there’s only a single reinforcement layer, the strengthening effect of a layer in the middle of sample height is better than that of a layer at 1/4 height or 3/4 height, which accords with the results from macroscopic experiment.
Simplified Design Method of Debris Arch Detention Dams Structure and Its Application in Highway
Authors: Li Zhong , Zhu Yan Peng , Song Xiao Ri
Published: February 2012

As a debris detention structure, small arch dams have some characteristics of small size, big storage capacity, and economic compared with gravity dams In this paper, according to the work environment and force behaviors of debris detention structure, adopting Trial-load Method, and only considering the conditions of radial deformation compatibility at arch crown, a simplified method is derived, which is suitable for the calculation of small-scale debris arch dams. Examined by calculating an example, this method is simplified, and convenient to programmed, and easy to be mastered by engineering and technical personnel for debris detention structure design and calculation, and calculation accuracy can meet the project requirements.
The Analysis of Soil Slope Transient Seepage Consider the Change of Permeability Coefficient in Rainfall Condition
Authors: He Zhong Ming , Qin Yan Qi , Cai Zhong Xin
Published: February 2012

In order to study the transient seepage field of soil slope when the saturated permeability coefficient changes under rainfall infiltration condition, the finite element software is used to build the numerical analysis model, the influence of slope seepage field and pore water pressure caused by the change of saturated permeability coefficient are emphatically discussed. The results show, under the condition of the certain sustained rainfall strength and rainfall duration, the rain water infiltration rate and infiltration depth are proportional to slope soil saturation permeability coefficient; Pore water pressure along the elevation direction shows the characteristic of “two big heads, among small” under the influence of rainfall infiltration.
A New Architectural Design Method based on Web3D Virtual Reality
Authors: Bi Fang , Zhu Bing Si
Published: February 2012

The incorporation of virtual reality-based technology into architectural design is one of the directions developing the future architectural design. It is inevitable to bring profound effects to architectural design. This subject puts emphasis on limitations and deficiencies of expression and display in architectural design. Virtual reality-based technology, especially based on Web3D, is available to improve solutions and make certain accomplishments.
Structural Damage Detection Based on the Wave Velocity Analysis
Authors: Guo Yuan Cao , Hua Guo Shao
Published: February 2012

The wave velocity analysis is a kind of popular geophysical method. These years it is also used in structural damage identification which is discussed in this paper. This method is used to detect the interior damage of structure and is verified to recognize the damage effectively. The expression of the vertical and horizontal velocity is deduced and the wave velocity function curve is drawn according to velocity variety rule. The two dimensional and three dimensional wave field figure is drawn according to the wave velocity analysis and it shows the distinguish between the damaged and integrated structure. We can see the change of the wave shape and velocity and we can identify the damage in terms of the velocity variety rule. So the method introduced in this paper is verified to be a pontential way to identify the structural damage.
Seismic Geological Disaster Characteristics in MS 5.3 of Luhuo
Authors: He Zi Chen , Li Yu Sheng , Cao Guang Peng
Published: February 2012

Luhuo County is located in the Xianshui river fault which is a famous strong activity fault in the southwest of china. In April 10, 2011 an earthquake measuring Ms=5.3 happened near the Luhuo County , the earthquake and its secondary effect had triggered a series of geo-hazards, making the previous fragile geological environment had further deterioration and significantly increased the earthquake disaster risk of the mountain town. There are four main factors influence and control the geological disaster risks of the county, including the strong shaking effect of the earthquake fault, Qiuri River debris flows in the southern city zone, the geological hazards of Se Delong gully in the northern city zone and the group-occurring flows which threaten the county roads.
Study on the Calculation Method of Plum Blossom-Shaped Steel Roof Pre-Set Deformation Value in Construction
Authors: Tang Qing Rong , Zhou Jing
Published: February 2012

A steel roof structure is plum blossom-shaped and its flower core is a cable dome and five petals is a mixture structure with truss and grid. Its trusses are installed by cantilever construction. This paper analyzes the method to get pre-set deformation value (P.D.V) and makes use of software ANSYS to calculate the trusses P.D.V through backward iteration method to insure construction complete.
Crucial Geo-Qualities and Predominant Defects Treatment on Foundation Zones of Sino Mainland Xiluodu Arch Dam
Authors: Wang Ya Jun , Hu Yu , Zuo Zheng , Zhi Lu Ping , Gao Hua Xi
Published: February 2012

Xiluodu arch dam of Xiluodu hydro-junction standing on Jinshajiang River is one of international super-hydropower-projects. Furthermore, this super arch dam lies in peculiarly complicated geographical location where the most dangerous geologies of Southern-western China live. So, the dam foundation condition must meet rigorous requirements on geological stability, mechanical-physical characters and permeability etc. Thereby, the key scientific objects include attitude of foundation surfaces, geological defects of main strata, blasting-excavation-substitution systematic construction for soft geo-layers. Based on practical survey on strata’s lithologic characters and geological structural traits from bank slopes as well as valley bed, researched comprehensively were the dam foundation weathering and unloading condition, the distribution of intra- and inter-formational disturbed belts, compressive belts and parental fissures. Particularly, discussed attentively was their quality assessment. The analyses results showed that the globally initial quality of dam foundation was super one and the local geological defects can be reinforced reliably by substitutive excavation in addition to intense consolidation grouting so as to meet constructive requirements of Xiluodu arch dam. The conclusion is the sophisticated process for blasting construction and comprehensively constructive management system is applicable. The blasting excavation produced smooth and completely split surfaces. The exposed strata’s blasting damage was controlled effectively. The geo-strata’s treatment met generally constructive safety requirements.
Basic Mechanics Characters of Recycled Fine Aggregate Concrete
Authors: Geng Jian , Chen Yong Yong , Sun Jia Ying , Chen Wei
Published: February 2012

In this article, the basic mechanical characters of recycled fine aggregate concrete (RFAC) are studied, and the relationships of recycled fine aggregate (RFA) content, minimum particle size and water content with them are also discussed according to results of cubic compressive strength （f¬¬cu）, flexural strength （ff）, splitting tensile strength（fts）, axial compressive strength（fc）and Yang’s modulus （Ec）. The results indicate that the use of RFA will induce mechanical properties of RFAC to deteriorate, and the deteriorated trend of it become more obviously with RFA content increased and minimum particle size reduced, in addition to, the early compressive strength of RFA develop slowly. The RFAC elastic modulus is significantly lower than ordinary concrete, besides, RFA on elastic modulus was significantly affected than other mechanical properties.
Study on Large Air Cooled Thermal Power Structural Wind Properties under Different Wind-Break Wall Forms
Authors: Yao Ze Liang , Dang Fa Ning , Bai Guo Liang
Published: February 2012

Air cooled thermal power structure is composed of spatial steel truss and steel-concrete tubular columns. Permeable “A” shape structure and wind-break wall are installed on its top. The wind load in the wind-break wall has great effect on its lower part. The structural wind parameters is not clearly stipulated in current load code. To solve the problems of wind parameter value in design and effectively evaluate the influence on wind-break wall form to the structural wind-resistant properties, three different wind-break wall forms are presented. Wind properties on an actual air cooled thermal power structure under three different wind–break wall forms are simulated with FLUENT software. Wind pressure law on “A” type structure and wind-break wall under different wind-break wall forms and at different wind direction angles is studied. Every division section shape coefficient of wind-break wall and “A” type structure under different conditions is obtained. The wind presure distribution law and the most reasonable wind-break wall form is obtained.
Analysis of Mode III Collinear Periodic Cracks-Tip Stress Field of an Infinite Orthotropic Plate
Authors: Zhang Xue Xia , Li Chan , Cui Xiao Chao , Zhao Wen Bin
Published: February 2012

The cracks-tip field on collinear periodic cracks of infinite orthotropic fiber reinforcement composite plate subjected to anti-plane shear force is studied in this paper. With the introduction of the Westergaard stress function and application of complex function theory and undetermined coefficients method, mechanical problem is changed into partial differential boundary value problem. The undetermined coefficients and the stress function are obtained with the help of boundary conditions. Due to the distribution of periodic cracks, stress intensity factor depends on the shape factor. The results show that interaction happens between the collinear periodic cracks. When the ratio of crack length and crack spacing is less than 1/3, the interaction between the cracks is very small. When the ratio gradually increases to 1, strong interaction between the cracks will be found. Cracks-tip field has scale effect. When the ratio of crack length and the given reference crack length decreases, the displacement field is significantly smaller.
Dynamic Response Analysis of Underground Rock Tunnel under Earthquake Load
Authors: Zhang Pei Sen , Yan Wei
Published: February 2012

Recently, response problems of extant structures under dynamic loads have been hot spots with the increase of earthquake disasters. Dynamic response analyses of underground rock tunnel have been made using the dynamic mode of 3D finite difference software FLAC3D, considering the impacts of different lateral pressure coefficients on the rock tunnel under the same earthquake load. Some conclusions are drawn: the vertical displacement of the bottom of rock tunnel arch is the maximum under the same earthquake load; the maximum vertical displacement at the tunnel top decreases with the increase of lateral pressure coefficient; the maximum vertical velocity at the tunnel shoulder increases with the lateral pressure coefficient; the maximum vertical acceleration at the tunnel bottom first increases and then decreases with the lateral pressure coefficient.
Smoke Propagation in an Inclined Semi-Circular Long Tunnel
Authors: Leong Jik Chang , Chang C.L. , Chen Y. C. , Chen L.W.
Published: February 2012

This work used FDS to simulate tunnel fires occur in a semi-circular longitudinally ventilated tunnel. By varying the parameters such as the tunnel gradient, the fire size, and the ventilation velocity, their influence on the backlayering effect and downstream propagation rate can be recognized. Under weak ventilation, the backlayering effect either advances or vanishes depending on the slope of the tunnel. Under stronger ventilation, the backlayering effect would break up. The temperature distributions may become less and less dependent on the tunnel gradient when the ventilation velocity is increased. Although the hot gases and smoke in uphill tunnels propagate faster than those in downhill tunnels, their difference reduces with ventilation velocity.
Research on High Ground Stress and Soft Rock Roadway Supporting Technology of Bide Coal Mine
Authors: Jiang Yong Dong , Xiong Ling , Zhou Wei Xin , Han Xing Jiang , Mei Shi Xing , Hu Jian
Published: February 2012

This paper， based on the distortion and failure character of soft rock Roadway in Bide coal mine, analyzed deformation and failure mechanisms of soft rock roadway that all are effected by factors of ground stress, lithology, mining influence, unreasonable support parameters and water. The new supporting scheme and parameters optimization of roadway were presented by means of ground stress measurement, mechanics parameters determination of roof and floor rock, monitoring of anchor-hold and result of surrounding rock classification. Then, through numerical simulation, this paper analyzed how the new supporting scheme could control the deformation of surrounding rock effectively, reduce tress in periphery area of surrounding rock, and decrease the stress concentration region of roadway, and prevent the base angle rock mass from macro shear slipping. The field examination results showed that the new supporting scheme was feasible, which can ensure the stability of roadway, with no consequences like roof falls, rib spalling and floor heave.The research results can be used as reference to design supporting structure in high ground stress soft rock roadway .
Application of the Evidence Theory in the Safety Evaluation of Tower Cranes
Authors: Huang Su Ping
Published: February 2012

The safety management of tower cranes is a systematic engineering. Focused on the complexity and uncertainty of the safety evaluation of tower cranes, D-S evidence theory is applied to evaluate the the safety conditions of tower cranes in service, the safety risk assessment index system of tower cranes is built and the specific and improved algorithm of the evidence theory is given. through example calculation, this method is proved is feasible, effective and applicable in the safety evaluation of tower cranes.
Analysis of Main-Structure of Deck Unit Erection Gantry for Suspension Bridge
Authors: Lu Jun Li , Wu Chong
Published: February 2012

The stiffening girder of suspension bridge is usually erected by a deck unit erection gantry because of low cost and short construction period. Mechanical behaviors of deck unit erection gantry for suspension bridge were investigated with an example for Aizhai Bridge located in Hunan province. The beam elements and shell elements were used for the analyses of steel truss and moveable supports of the gantry respectively.
Field Investigation on the Stability of the Tunnel Surrounding Rock and the Support Measures under TBM Construction
Authors: Wang Yu Suo , Wang Ming Nian , Wu Zheng Qun , Yang Qi Xin
Published: February 2012

Considering the effect on surrounding rock exerted by TBM construction and its corresponding support measures are quite different from those of drilling and blasting construction, this study attempts to investigate the disturbance of TBM construction and its countermeasures. The investigation specifies the size of the drop pieces, position and cause and provides support measures for different stability condition of surrounding rock.
Discussion on Structure Design of Shaft Lining Built in Porous Rocky Aquifer with High Water Pressure
Authors: Zhou Xiao Min , Deng Bing , Ma Cheng Xuan
Published: February 2012

Firstly based on the practical problem of lining thickness built in porous rock aquifer with high water pressure, this paper introduce the mechanical and stable seepage model, and design formula of shaft lining named Baoshen; Secondly, the character of load and parameters in the “Baoshen” formula are studied, compared with the “Lame” formula and the original heavy earth field , which shows good universal feature to cover several traditional design methods. Thirdly, the principals of interaction among high pressure water, lining and surrounding rock are revealed by figure and discuss on inequality inequation; With a newly application example, the practical usage are introduced and newly viewpoints are opened to designers with material promotion, arrangement of re-bar or bolt, structure optimum etc.
Finite Element Analysis of Resisting Explosive Loading for Mine Escape Capsule
Authors: Wang Jin Long
Published: February 2012

Three-dimensional finite element model of the mine escape capsule is established. With the different values of explosion shock waves, simulation analysis of the entry locker is performed by using ABAQUS. The simulation results indicate that the mine escape capsule is safe and available if the surge pressure of shock waves is less than 3.5Mpa.
Transverse Free Vibration Analysis of Buried Pipeline under Simply Supported Restraint
Authors: Hao Ting Yue
Published: February 2012

The pipe model is simplified as elastic foundation beam model of Euler-Bernoulli in the paper. Considering the effect of fluid flow in the pipe and outer soil constraint, the transverse vibration differential equation of buried pipeline is derived by using of Hamilton principle. By utilization of the first three-order modal and the orthogoality of main vibration mode, the equation is deduced and transformed into state formulas. The typical numerical example is analyzed by Matlab software. It is found that the natural frequency of pipe conveying fluid usually decreases along with flow velocity improving and the effect of foundation on the pipe stability is apparent.
Subway Ventilation and Air Conditioning System Operating Mode of Study
Authors: He Shun Jun , Xu Hai Lun , Zhong Xing Can , Wang Ling
Published: February 2012

In this study, a regional standard practice in the construction of the subway stations and tunnels for the study, with the SES software, a mathematical model of the closed system, platform screen door (PSD) systems, hybrid air conditioning system (adjustable ventilated platform doors [1]) to run the program properly simulate the conditions. Analysis of annual energy consumption of each system to be; while the traditional mode of operation of the system to explore and optimization; ventilation and air conditioning system for the new subway rational design and operation and management of scientific data to provide valuable information..
Optimization of Double-Ring-Pipe Freezing Scheme for Tunnel Cross-Passage Construction
Authors: Hu Xiang Dong , Ji Bing Yi
Published: February 2012

For numerically simulating the phase change of water in ground freezing process, a correct method is proposed in this paper, that the unfrozen water content in frozen soil is taken into account to calculate the enthalpy value at different temperatures. A calculation example of a cross-passage project in shield tunnel shows that the thickness and the average temperature of the frozen wall calculated by this method are very close to the in-situ monitored data. Based on this method, by comparison of the development rate of thickness and the average temperature of the frozen wall according to different design plans, the ground freezing scheme for the cross-passage is optimized for the shortest duration of freeze in agreement with the work standard. The study could enlighten the design for similar projects in the future.
Numerical Analysis on Adjacent Highrise and Multistoried Buildings-Pile-Soil Dynamic Interaction
Authors: Li Pei Zhen , Xu Peng , Pan Zhao Hui , Lu Xi Lin
Published: February 2012

In this paper, the general finite element analysis program ANSYS is adopted to analyze the 3D finite element model of adjacent highrise and multistoried buildings-pile-soil dynamic interaction system. In the model, the soil parameters are based on the characteristics of Shanghai soft soil, and the adjacent upper structures are two frame structures, which had 12 stories and 5 stories respectively. Through comparing the simulation results of this particular dynamic cross interaction system with those of single structure and two identical structures, some useful conclusions were obtained.
Application and Implementation of Ecological Design for Single Building
Authors: Ye Zhong Hua
Published: February 2012

Architectural ecological design is not merely a simple method of architectural design, but a technique and measure of protecting the ecological environment, developing ecological economy and culture, emphasizing sustainable development. Based on the measures of ecological design of function, organization, layout, utilization of natural light, and implementation of natural ventilation, reducing of noise of single building, the application and implementation of ecological design for single building are analyzed, which provides a reference for other projects.
Study on Mechanical Behavior of the Key Components of High-Level Transfer Frame-Shear Wall Structure with Steel-Lead Viscoelastic Dampers
Authors: Yi Ling , Wu Cong Xiao
Published: February 2012

Based on the limited demand of transfer beam sectional dimension of tall building structure with transfer story in Technical Specification for Concrete Structures of Tall Building, a high-level transfer frame-shear structure with steel-lead viscoelastic dampers is presented for simulating the mechanical behavior of the key components effect with consideration the transfer beam depth with 1/6, 1/8 and 1/10 calculation span. The analysis results indicate that the internal force of the transfer beam, frame-support column of transfer story, shear wall above transfer level and base shear wall is obviously reduced, with the reduction of the transfer beam depth. Comparison with the high-level transfer frame-shear structure, the internal force of the key components of the high-level transfer frame-shear structure with the steel-lead viscoelastic dampers also is reduced. Therefore, the limited demand of the transfer beam sectional dimension and the construction measure of the shear wall could be properly reduced in the high-level transfer frame-shear structure with the steel-lead viscoelastic dampers.
Mechanics Analysis of Asphalt Pavement with Crumb Rubber Modified Cement Stabilized Macadam Base
Authors: Guo Hong Mei , Zhu Han
Published: February 2012

Reuse of the waste tires in highway engineering is very important for reducing pollution, protecting environment and resources. At present, the rubber chippings from waste tire have been widely used in construction and maintenance of asphalt concrete road surface. But there is little research about cement stabilized macadam base with crumb rubber. This paper used the large-scale finite element analysis software ANSYS to build the pavement structure model, assuming the contact conditon as continuity, analyzed the effect of asphalt pavement by changing the thickness and modulus of cement stabilized macadam base with crumb rubber. The results showed that the value of vertical displacement of crumb rubber modified cement stabilized macadam base is larger than the value of cement stabilized crushed stones base, and increasing the thickness and reducing the modulus of base can decrease tension stress of base bottom.
Influence of Cracked Size of Old Concrete Pavement on Asphalt Overlay Stress
Authors: Wang Yong Hong , He Xiong Jun , Qiu Hong Sheng , Tan Xi Ming
Published: February 2012

For the old concrete pavement with large proportion damage, it can be reconstructed by paving asphalt surface after cracked and stabilized with punching technique. But there is great difference in adopting the cracked size of pavement slab in every place and there is no relational theory basis. So the authors use 3-D finite element method to analyze the relationships of cracked size of concrete slab and load stress, thermal stress, coupling stress in asphalt overlay and pressure stress on the base surface. The results show that the influence of cracked size on thermal stress and coupling stress is much greater than load stress. With the decrease of cracked size, the thermal stress and coupling stress in asphalt overlay decrease rapidly, the stress centralization at joints and cracks lessens evidently, while the pressure stress on base surface increases. Considering the factors synthetically, it is reasonable for the cracked size from 80cm to 100cm.
Evaluation of Low Temperature Performance of Asphalt Mixtures with an Analog Experiment
Authors: Tan Yi Qiu , Wang Da Qing , Zhang Lei , Li Zhi Hui , Qi Yu Xiang
Published: February 2012

Abstract. To evaluate the low temperature performance of PR PLAST.S modified asphalt mixture, an analog experiment was adopted. It was found that it is not consistent between the evaluated results from TSRST and the content of PR PLAST.S can affect the low temperature performance of asphalt mixture. It also found that there is the optimal content to make asphalt mixture have the best low temperature performance.
Application of Fault Tree Analysis Method on Hazard Identification in Highway Construction
Authors: Yang Chun Feng , Jia Yun Bao , Sun Ji Shu , Zhou Ji
Published: February 2012

In engineering project, for a long time due to the particularity, risks and complex organization structure and management modes, etc. Construction safety has plagued the professionals and the general scholars, and highway construction is no exception. To ensure the safety of highway construction projects, hazard identification has become the top priority. Therefore, this paper proposes FTA of highway construction for hazard identification, introduces the basic steps and application process, and explain the application of this method with examples in detail. The application results of fault tree analysis verified this method is scientific and feasible.
Evaluation, Analysis and Optimization of Rigid Pavement Seams of Joints and Effect of Several Types of Dowel Bars on it
Authors: Safa Ebrahim , Safa Arman , Hasani Abolfazl , Mansourkhaki Ali
Published: February 2012

In the rigid pavement ,seams of joints has been used to prevent damage caused by expansion and contraction of the slab Changes in temperature differences and slab movement. On the other hand always rigid pavement cracks starting and totally starting the failure of the concrete slab are in this region that it has many different causes. In the Place of joints side uses the dowel bar for evidence performance that transfer the forces between slabs to control expansion and contraction changes in slabs. Destruction and deviation in the concrete slab joints side , the high cost of repairing and replacement of dowel bars and the cost of repairing the cracks and the failure of slabs are the reason for re-modeling, analysis and optimization of joints and dowel bar types. In This project, we try to define the role and influence of the shape of dowel bars and optimize the performance of joints in the rigid pavement.
Analysis on Adhesion Coefficient of Ice and Snow Pavement
Authors: Liu Chun Xiao , Cheng Guo Zhu , Zhang Ya Ping
Published: February 2012

The number of traffic accidents caused by ice and snow is generally three to four times higher than that in normal condition. In order to improve safety level when driving on ice and snow pavement, adhesion coefficient is a vital parameter need to be analyzed. The relations between adhesion coefficient and temperature, relative humidity, snow’s thickness, snow’s compactness were studied. And their relation models were established. These models may provide the basis for the road administration department to conduct traffic control decision-making according to the weather condition and the state of ice and snow.
Application of CFG Piles in Treatment of a Large Oil Tank Foundation
Authors: Xie Zhong Qiu , Jun Cao , Xiao Hong Bin , Li Zhen Yu
Published: February 2012

The original plan is to use vibro-stone column composite foundation to treat a large oil tank foundation. The result of strengthening is not satisfactory because of some factors, such as difficulty to control quality and long construction period etc. Treated ground can not meet the design requirements. The key in treatment design of tank foundation lies in bearing capacity and deformation of foundation, especially in non-uniform deformation. Through the analysis of site conditions, composite foundation of CFG piles is adopted. It is designed according to strength and deformation of dual control theory. Experimental results show that the compound used in foundation design is appropriate.
Mechanism Research on Water Damage of Asphalt Mixture Based on Chemical Thermodynamics
Authors: Xiao Qing Yi , Lin Yong Hui , Hu Hai Xue , Li Ning Li , Zhang Cai Li
Published: February 2012

Moisture can be defined as the early loss of strength and durability caused by moisture penetrating through the asphalt-aggregate mixture. This failure can be adhesive occurring at the asphalt-aggregate interface or cohesive occurring within the matrix (asphalt binder plus mineral filler). Therefore, the knowledge of chemical thermodynamics theory will help a great deal in understanding the adhesive properties of the asphalt mixture within the water. Water damage model of asphalt mixture are presented based on surface and interface theory. Two types of aggreates, a limestone and sandstone, two asphalt binder of base asphalt and SBS modified asphalt are used to produce four different mixutres of HMA in the paper. The four mixtures are subsequently tested using the method and ranked. According analysis of results, the methods based on chemical thermodynamics theory offers viable alternative to the assessment of water susceptibility of HMA. This method is simple, quicker and equipment utilized can easily and cheaply be assembled.
Characteristics of Liquefaction Resistance for the Saturated Silty Soil Ground Treated by Compacted Gravel Pile Composite Foundation
Authors: Zhan Yong Xiang , Yao Hai Lin , Jiang Guan Lu
Published: February 2012

Based on Beijing-Shanghai high speed railway, the numerical simulation mainly researched on the seismic behavior for the saturated silty soil ground, which was treated by compacted gravel pile composite foundation. It has been analyzed that the region of liquefaction distribution and the transferring rule of excess pore water pressure under a series of input acceleration seismic loads in the treated and untreated foundation. The research results indicate that the untreated saturated silty soil ground is almost whole liquefaction when the amplitude of input acceleration is more than 0.15 g. While for compacted gravel pile composite foundation, out of treated region is less liquefaction when the amplitude of input acceleration is 0.15 g, with the increasing of input acceleration, liquefaction region is further more and gradually expands to the inner soil between piles, and compacted gravel pile composite foundation is only partial liquefaction when the amplitude of input acceleration is 0.25g. Excess pore water pressure is increased with the increasing of input acceleration seismic load, and the increasing of excess pore water pressure can be restrained effectively by compacted gravel pile composite foundation, and the quality of liquefaction resistance is improved. The design of compacted gravel pile composite foundation can satisfy the seismic requirements of Beijing-Shanghai high speed railway under the condition of 7 degree seismic fortification.
Design and Implementation of Hydraulic Torque Converter’s Performance Test System
Authors: Tian Guo Fu , Zhang Guo Wen , Qiao Yang Yang , Liu Xian Feng
Published: February 2012

Hydraulic torque converter’s performance testing is very important in the product’s development and production. In order to accurately and rapidly test various performance parameters of the hydraulic torque converter, a torque converter performance test system was developed based on the PC and VB development platform in this paper. It can improve computing speed and programming capability, decrease artificial involved times, realize the data analysis processing’s automation.
Numerical Simulation of the Bending Creep Test for Asphalt Mixture
Authors: Zhao Li Hua
Published: February 2012

This paper using ABAQUS software to do the numerical simulation research for trabecular bending creep test of asphalt mixture , system analysis the internal stress distribution and deformation characteristics of the specimen, comparison research the test results and the fitting results, eventually get the method of determining the parameters to simulate the asphalt mixture creep behavior. As doing the numerical simulation for performance of asphalt mixture, which can give a practical significance for improve the asphalt mixture research level.
Vehicle Parameters Influence on Vertical Load-Carrying Natural Frequency of Railway Double-Track Steel Truss Continuous Bridge
Authors: Ren Jian Ying , Su Mu Biao , Li Wen Ping
Published: February 2012

The railway double-track continuous bridge vertical load-carrying frequency is calculated with the vehicle-bridge system mode1. When two lines with 20 same high-speed passenger vehicles are traveling on the 3×64 m through stud welding railway steel truss bridge from both ends, it is analyzed that the vehicle parameters how to influence the bridge vertical load-carrying frequency. The bridge vertical load-carrying frequency is influenced by the unsprung mass of each wheel-set of the vehicle, the suspension spring stiffness, the vehicle length and the mass of the vehicle. But it is independent of the speed of the train．It is shown that the bridge vertical load-carrying frequency is the vehicle-bridge system natural frequency, it is only depend on its natural parameters.