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20 August 2011, Volume 25 Issue 4 Previous Issue    Next Issue

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Treatment of Saline Foundation of Main Canal of South Bank in Xinjiang FAN Yi tian 2011, 25 (4):  2-4.  Abstract ( 2035 )   Save There is the high saline sandy gravel foundation of main canal of South Bank in Xinjiang, which locates its end and 4.3km long. The saline matter as the soluble salt, insoluble salt forms exists in the soil, in which the soluble salt migrates easily under the action of water flow to result the karst depression disruption for foundation. Based on the survey, the replacement treatment is used successfully. Related Articles | Metrics

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Construction Technique of CFG Pile in Saline Soil of Luyanghu FANG Yun1, MA Biao2, LUO Jian hua1 2011, 25 (4):  5-7.  Abstract ( 2964 )   Save Aimed to solve the saline soil ground during the highway construction in Luyanhu development zone, Shanxi Province. according to its basic property by tests, the comprehensive treatment of dewatering, CFG pile and immersed salty is used. By monitoring of the whole construction process, its basic procedure, construction mixture ratio control, quality testing and control measurement in saline soil region are summarized, which is provided as the reference for similar engineering. Related Articles | Metrics

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Deep Foundation Pit Design and Construction Adjacent Pipe Pile Foundation ZHAO Jian xiong 2011, 25 (4):  8-10.  Abstract ( 3160 )   Save Based on the deep foundation pit design and construction adjacent the pipe pile foundation, the surrounding environment, hydro\|geological conditions and other factors were comprehensively considered, the cast\|in\|situ bored pile was as the retaining structures, the rotary jet grouting pile was as the water resistant curtain and the prestressed internal support was in the foundation pit. There were some problems encountered during the design and construction, which were solved by analysis and some relevant experience were obtained, which provides reference for similar projects to provide experience in supporting. Related Articles | Metrics

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Application of Advanced I-steel Pile in Excavation Retaining CHEN Yi quan1, LI Xing yuan2 2011, 25 (4):  11-13.  Abstract ( 2986 )   Save For the excavation of garage foundation, its excavated depth is no less than 6.0 m and the distance between the excavation and the existing building is just 0.3 m. The crack in the building nearby is caused if the normal construction method is accepted, therefore the combination of advanced I\|steel pile with soil nail is adopted, the construction procedure is adjusted, which is successfully for the deformation control and the stability of around buildings.   Related Articles | Metrics

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Risk Control During Mine Construction of Subway Tunnel Underpass Buildings SHI Xiang feng， HAN Yan fei， TAN Xiao 2011, 25 (4):  14-16.  Abstract ( 2795 )   Save There is high risk for settlement during mining construction of subway tunnel underpass buildings. Based on a project of Guangzhou subway tunnel, the risk and the corresponding control measures during the construction are introduced, then the treatment to the water leakage, the key factor for settlement, which can provide a reference for similar projects． Related Articles | Metrics

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Dynamic Response and Stability of High Slope in Mian-mao Highway under the Condition of Seismic ZHANG Da qi 2011, 25 (4):  17-20.  Abstract ( 2800 )   Save The dynamic characteristics of high slopes such as dynamic stresses, dynamic displacements and acceleration due to seismic loads are investigated by employing the dynamic FEM\|UEM coupling numerical analysis. These slopes comprised of different rock or soil mediums of Mian\|mao highway in Sichuan. The distribution of stresses and strains in the limit stability condition is obtained by using the strength reduction method, and the potential instability region of slope subjected to seismic loads is determined, which is as the reference for slope treatment of Mian\|mao highway and other similar engineerings. Related Articles | Metrics

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Slope Deformation Analysis Initiated by Rainfall SU Sheng zhong 2011, 25 (4):  21-24.  Abstract ( 2597 )   Save The deformation monitoring data of the five monitor points in slope engineering is studied thoroughly, especially the influence of startup and reduce convergence time of slope deformation initiated by rainfall, and the deformation law is analyzed. Results show that both of the startup time and the reduce convergence time are obvious hysteresis, which lags the time section of heavy and intensive rainfall about 20 days. Furthermore, rainfall not only triggers the slope displacement's mutation, but also makes its obvious development trend. Related Articles | Metrics

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Influences of Frost Heaving on the Stability of Soil Nailing Wall Over Winter in Northern China CHEN Mo 2011, 25 (4):  25-29.  Abstract ( 2855 )   Save The forst heaving process is the potential danger for the foundation support engineering over winter in northern China. Based on the soil nailing wall engineering over winter in Beijing, the influence of frost heave force to its stability was analyzed. Results show that the horizontal displacement of frost heave soil induced by frost heave is more than the one of weak frost heave soil, the change of soil nail's tension induced by frost heave is more than the one of weak frost heave soil. Related Articles | Metrics

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Application of CFG Pile in Special Passengen Railway Line of Wuhan-Guangzhou TIAN Xin wen 2011, 25 (4):  30-32.  Abstract ( 2677 )   Save Considering the strata distributing and stations along the Wuhan\|Guangzhou special passengen railway line, which is the first high\|speed railway in China, the soft foundation is reinforced by the CFG pile composite foundation. Its features, application condition and construction technology are introduced and its design is analyzed, then the after construction detection and monitoring methods is introduced, in the end its application is introduced. Related Articles | Metrics

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Test of Underground Abandoned Pipes with Filled Muddy Clay TANG Qun yan, WANG Zheng liang, JIA Min cai 2011, 25 (4):  33-35.  Abstract ( 3228 )   Save The slurry is made from the abandoned muddy clay as main filled material combined with the proper water and cement. Its fluidity and mechanical property after conservation is studied, in which the proper ratio of slurry in the underground abandoned pipe is also studied. Based on the indoor test, the slurry is form in the seepage tank by pump, after conservation, its mechanical property is tested in situ, the feasibility of prepared slurry in the underground abandoned pipe is analyzed, then the proper ratio is suggested. Related Articles | Metrics

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Slope Stability Analysis Based on Finite Element Method with Tabu Search LI Jun qi1, ZHAO Hong bo2 2011, 25 (4):  36-39.  Abstract ( 2712 )   Save Compared with the limit equilibrium method for analyzing slope stability, the finite element method (FEM) has its own advantage when it combined with Tabu search. Because of their combination, the safety factor of slope is calculated meanwhile the most dangerous sliding surface is also determined, in which it reflects not only the advantage of FEM for its numerical analysis but also the identification of limit equilibrium, particularly the global searching ability of Tabu search is fully utilized. The example shows its feasibility, which implies the finite element method with Tabu search has the bright future of application for analyzing slope stability. Related Articles | Metrics

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Physical Simulation of High Slope Deformation Failure Induced by Strong Seismicity ZHANG Li yong1, LI Jun ming1,2, WANG Hua jun1 2011, 25 (4):  40-43.  Abstract ( 2143 )   Save A high slope belongs to the Dujiangyan to Wenchuan highway section of the national road 317, located at the right bank of Minjiang River, about 3km from Wenchuan County. The slope was local collapsed in the earthquake and threatened the road's security. The high slope deformation failure under earthquake is studied and analyzed by the physical simulation, the conclusion is that the response of slope surface is significantly larger than the ones on the bottom and internal in model, the reaction intensity is increased with the increasing of slope heights and slopes in general. Its failure type under strong seismicity is sliding, in which the massive body turns to pieces and debris, its geomechanical model is the slip\|fracturing. Related Articles | Metrics

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Study of Influence Factor for Elevated Pile Caps under Horizontal Loads WEI Jin ju1, CHEN Feng2, LIU Shu guang3 2011, 25 (4):  44-48.  Abstract ( 2679 )   Save The 3-D model is founded by finite element method for elevated pile cap, which consists of sheet piles in first row and square piles in second row. The influent factors of displacement on top of pile and flexure moment of pile is analyzed, such as the change of soil resistance coefficient, pile length, pile's length in ground, pile diameter etc. The result shows that the pile's flexural rigidity increases and the horizontal displacement reduces by increasing the pile's section area. It is effective for the readjusting of flexure moment in piles between two rows by increasing of flexural rigidity of square piles in second row, because it is more reliable and uniform for moment distribution of the elevated pile cap. Related Articles | Metrics

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Bearing Capacity Analysis of Bucket Foundation on Clay with Transversely Anisotropy under Condition of Torsion Shear Loading WU Ke1,2, MA Ming yue3, CHEN Rong4 2011, 25 (4):  49-51.  Abstract ( 2426 )   Save As the part of offshore platform, the suctional bucket foundation bears not only the vertical loading induced by the weight of offshore platform structure and itself but also torsion shear loadsing induced by wave and wind. However, there is no a commonly\|acceptable calculation mode and analytical method for the torsional shear of suctional bucket foundation. According to the transversely anisotropy of soft clay, the bearing performance of bucket foundation is studied under the condition of tortional shear loading by FEM, in which a series of changing parameters are compared calculation, then the amount of calculated results is analyzed systematically, their numerical calculation results and analysis are provided as the reference for engineering design. Related Articles | Metrics

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Information Construction of Deep Foundation LI Guang ping1, YUE Lu2, SU Wen ji2 2011, 25 (4):  52-55.  Abstract ( 2610 )   Save The information construction is a modern construction management approach by using system engineering, the field measurement information is fully used to identify medium constitutive model, modified calculation parameters and forecast the subsequent character based on the current foundation, which approach to the actual property of soil. There is the initial discussion of the information construction of deep foundation. Related Articles | Metrics

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An Evaluation Method in Micro-Zoning for Karst Development Degree WANG Yu, FAN Lian, MEI Tao, WANG Xing yun 2011, 25 (4):  56-58.  Abstract ( 3479 )   Save As a special engineering geology phenomenon, the development degree evaluation of karst is one key of engineering design. Based on karst foundation engineering of Ye Gang 220 kV substation in Huangshi, the engineering site is divided into some small zones, and the surface density contour of karst cavity, three dimensional contour of bedrock surface, and drilling hole event rate contour are drawn by using software sufer. Based on the graphics and practical data the micro\|zoning of different karst development degree is evaluated, which provides reference for engineering optimization design. Related Articles | Metrics

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Development of EPC General Contract in Geotechnical Engineering & Case Introduction ZHAN Jin lin, SHUI Wei hou, LIANG Yong hui 2011, 25 (4):  59-62.  Abstract ( 3042 )   Save The EPC of geotechnical engineering is introduced. From the point of cost and time saving, quality guarantee etc, the advantages of geotechnical engineering EPC contract is discussed. The current domestic EPC principal of geotechnical engineering development in the two modes is summarized and its prospect is discussed, its difficulties and obstacles during the development of geotechnical engineering contracting are analyzed, its development trend is pointed out that the Geotechnical engineering EPC contract is a geotechnical soil specialization, socialization, and integration. Finally, with a tank\|based investigation, design, construction, monitoring of general contracting projects as an example, the superiority of geotechnical engineering EPC contract is analyzed by design optimizing, over 60% of construction funds and 50% construction period saving.   Related Articles | Metrics

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Application of TSP Advanced Geological Forecast of Tunnel Construction in Strong Weathered Sandstone FAN Xiao qiang 2011, 25 (4):  63-65.  Abstract ( 2612 )   Save There are many geological hazard accidents in the tunnel construction especially under the condition of complex geology, such as the strong weathered sandstone and the landslip of the faulted fracture zone. The construction risk is reduced effectively, the construction security and the progress are guaranteed and the project accident's occurrence is reduced by the accurate advanced geological forecast. According to Fujiachong tunnel engineering of Yiba highway in Hubei province, based on the TSP advanced geological forecast, its basic principle and method are introduced and its application is evaluated. The result is proved during the construction, which indicates its reliability. Related Articles | Metrics

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Relationship between Shearing Strength and Water Content of Expansive Soil LIU Peng 2011, 25 (4):  66-68.  Abstract ( 2789 )   Save By standard method of wet sand and drop test, the relationship between shearing strength and water content of expansive soil is studied, the shearing strength formula is provided, then strength parameters of expansive soil, at last, the mechanism is analyzed. Related Articles | Metrics

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The Statistical Analysis of Soil Test Report with Excel VBA LIU Da hai 2011, 25 (4):  69-72.  Abstract ( 4201 )   Save The stratified statistics of soil test indicators is the basis of data analysis in geotechnical engineering investigation, which is the main basis for providing geotechnical parameters such as bearing capacity of foundation and pile, ground deformation analysis and foundation pit supporting. Based on Excel soil test report and Excel VBA, template of statistical analysis is prepared and statistical processing of stratified data is realized. Its Excel table can be used directly as the project document of a survey report. Related Articles | Metrics

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Theory and Application of Ultrasonic Testing with Single Transmitter and Dual Receivers in Single Hole YUAN Bo1, HE Hao hui2, YAO Li ming3 2011, 25 (4):  73-74.  Abstract ( 4083 )   Save The ultrasonic testing is one of the elastic wave tests, its theory is from the theory of elastic wave propagation in solid media. In this method, the ultrasonic wave is from the artificial excitation vibration source to some certain media, such as rock, rock mass and concrete, etc., and the wave modulated by their physical characteristic is received in some distance, then acoustic parameters of wave such as velocity, amplitude, frequency, etc. are observed and analyzed. By this way, some problems in geo-engineering are solved. Related Articles | Metrics

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TSP Application for Tunnel Construction in Expansive Rock LI Xi ya 2011, 25 (4):  75-77.  Abstract ( 2576 )   Save Geological hazard accidents often occur during the tunnel constructions especially in the condition of complex geology, such as the water and mud rush in karst region and the landslip of the faulted zone. The construction risk in tunnel is reduced effectively by the accurate advanced geological forecast, the construction security and the progress are guaranteed and the project accident's occurrence is reduced. According to Nada tunnel engineering of YunGui railway in Guangxi province, based on the correct geology forecast, the basic principle and method of TSP is introduced. And its application effect is discussed. Then by compared the forecast results with the actual engineering, the method of TSP in advance geology forecast is proved reliably. Related Articles | Metrics

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A New Method to Calculate Reinforcement in Circular Section Concrete Retaining Piles LI Qian nan1， XIONG Zong hai2 2011, 25 (4):  78-81.  Abstract ( 3282 )   Save Based on the view point of the uniform reinforcement along entire circular section combined with partial uniform reinforcement. There is a new method to calculate reinforcement for R.C. Retaining Piles with circular section, in which the function table and the correction formula are included. The results shows that the application of new method the steel bar is saved about 14~31% with the advantage of uniform reinforcement alone entire circle. Related Articles | Metrics