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20 April 2011, Volume 25 Issue 2 Previous Issue    Next Issue

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Engineering Protection Study of Layered Rock Mass High-cut Slope in the Three Gorges Reservoir PENG Zheng hua, SU Chang, JIANG Ya ming, SHI Chang bai 2011, 25 (2):  3.  Abstract ( 2258 )   Save According to the characteristics and distribution of layered rock mass high-cut slope, the four failure models was proposed, which included weathering erosion of slope, erosion of slope toe, consequent sliding and collapse. Then the related protection was proposed, which was as the reference for the guideline of layered rock mass high\|cut slope in the Three Gorge Reservoir. Related Articles | Metrics

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Study on Crack Analysis and Measurement of Highway Subgrade FU Wei, WU Wan ping, HE Bin, RUAN Yan bin 2011, 25 (2):  8.  Abstract ( 2632 )   Save There was the longitudinal crack occured in the highway subgrade shortly after the opening to traffic. The cause of longitudinal crack was found out based on the extra geotechnical investigation, subgrade deformation monitoring and crack extension monitoring, in which the high compressible soft soil under subgrade soil, the poor filling material and the poor quality of construction were main causes, then the related measurement was proposed to improve the integral stability and durability of embankment. Related Articles | Metrics

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Test Analysis of Properties and Strength Change of Sludge Soft Soil Consolidated by Vacuum Preloading DONG Jiang ping1, TANG Tong zhi2, ZHANG Xiong zhuang1, YUE bin2 2011, 25 (2):  12.  Abstract ( 2557 )   Save On the basis of laboratory and in\|situ tests, the index of sludge soft soil about physical, mechanical and strength properties before and after the vacuum preloading treatment was studied. Results showed that the property of sludge soft soil in the depth of drainage body was improved. Related Articles | Metrics

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Study on Bearing Capacity of Precast Pipe Pile on Flyash Foundation in Zhengzhou FANG Jun lin, ZENG Fu qiang, SHAN Ming 2011, 25 (2):  17.  Abstract ( 2626 )   Save The engineering property of the flyash foundation in Zhengzhou was introduced and the quality of PHC pile was tested by the static load test. According to the p~s curve in the static load test, the bearing capacity of pile on the flyash foundation was studied. Then its feasibility on the flyash foundation and the rationality of the standard value of ultimate lateral resistance of pile on the flyash layer were discussed. Related Articles | Metrics

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Analysis of Actual Earth Pressure Around Pile\|Anchor SupportingStructure in Sandy Cobble Ground of Chengdu YANG Qing， QIAN Xiao 2011, 25 (2):  22.  Abstract ( 2993 )   Save To obtain the distribution pattern of earth pressure acting on the supporting structures in sandy cobble ground, the in\|situ monitoring data of earth pressure from a typical deep foundation pit in sandy cobble ground in Chengdu was analyzed. Results show that the distribution pattern of actual earth pressure is non\|linear in sandy cobble ground. The value of actual earth pressure of the range of three meters on the top of pile is between the classical Rankine's active earth pressure and the static earth pressure and the one of the other parts is far less than classical Rankine's active earth pressure. The influence between the horizontal displacement and the earth pressure on the ring beam and excavation surface is very little. Then the rationality of this occurred situation was analyzed. It has important reference value for supporting system's design of the similar deep foundation pit. Related Articles | Metrics

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Foundation Deep Well Dewatering and Pumping Test in Main Engineering Stage one of Gaoshibei Lock FENG Hong wu1, XU Guo xing2 2011, 25 (2):  27.  Abstract ( 2345 )   Save The water diversion works from Yangtze River to Hanjiang River was the giant main canal and one part of mid\|route of South to North Water Diversion and there was the three level ship lock at the entrance of navigation engineering, which was located at the right side of Hanjiang River in Gaoshibei town, Qianjiang city and connected with the giant main canal. The stratum and permeability property of construction site of Gaoshibei ship lock engineering was obtained by in\|situ pumping test and the parameter of pumping well such as well structure was selected, then the deep well dewatering scheme was proposed, which was provided as a reference for similar dewatering engineering of ship lock foundation. Related Articles | Metrics

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Characteristics and Remedy of High Slope Landslide in DK1824 Section of Wuhan Guangzhou Railway Passenger Dedicated Line ZHAN Xue qi 2011, 25 (2):  30.  Abstract ( 2735 )   Save The engineering geology condition and characteristics of high slope landslide in DK1824+510~+625 section of Wuhan Guangzhou railway passenger dedicated line was introduced. The cause, property, state of landslide and the characteristics of landslide mass factor were analyzed. The potential slide surface and its mechanics parameters were determined. The remedy was proposed and used successfully in the landslide remedy engineering. Related Articles | Metrics

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Cause and Related Treatment of Pool's Inclination in Water Plant ZHANG Lei， LU Jie, CHEN Lian cheng 2011, 25 (2):  35.  Abstract ( 2378 )   Save Because the construction period of water plant was in the rainy season, a huge of surface water poured into the construction site for a shot time, as a result, the deformation of pool's floor was serious and there were cracks and the obvious inclination of it. After the treatment of soil removal by water jetting was used, it worked normally. Related Articles | Metrics

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Traffic-Load-Induced Vibration of Highway Pavement Structure CHENG Wei, CUI Hang, ZENG Er xian 2011, 25 (2):  38.  Abstract ( 2492 )   Save In order to analyze vibration features of highway pavement structure induced by vehicle traffic loading, a coupling model for laminated pavement structure and underlying ground dynamic interaction subject to distributed moving loading was developed by employing a hybrid method of the 2.5 dimensional finite elements and thin layer elements. The rules of vibrated acceleration of pavement surface and the stress distribution features of pavement surface, base and subgrade were heavily investigated when vehicle load passed through, in which the vehicle speed, load vibration frequency, structure form and material of pavement and modulus of underlying ground were considered. The results shows the vehicle speed and its vibration frequency are of great influnence to the acceleration response of pavement structure, meanwhile the stiffer the pavement material is , the lower the pavement structure is, which means the performance of pavement can be improved by choosing the proper material. Related Articles | Metrics

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Development of Grouting Materials of Road Maintenance LI Na1, ZHANG Liang jun2 2011, 25 (2):  44.  Abstract ( 2400 )   Save The chemical grouting material is used as many fields as road maintenance, bridge, tunnel, underground building and hydraulic structure because of its advantages such as low viscosity, high groutability, high permeability, adjustable curing time and soil consolidation to fill concrete cracks after slurry setting, by which the mechanical property of grouted soil layer or stratum is improved. The application development of grouting material both of domestic and abroad, then its development tendency is forecast. Related Articles | Metrics

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Geotechnical Evaluation and Seepage Prevention Treatment of a Landfill in Lanzhou GAO Ping 2011, 25 (2):  51.  Abstract ( 2073 )   Save The different seepage prevention plans of municipal refuse landfill was compared by analyzing its site geotechnical condition, then the comprehensive seepage plan of HDPE geomembrane with clay blanket was proposed suggested, which was provided as a reference for similar engineering. Related Articles | Metrics

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RPC Railway Bridge Pier Design Analysis YANG Bo, CHEN Yan ru, ZHANG Peng 2011, 25 (2):  55.  Abstract ( 2499 )   Save Active fly ash concrete(RPC), is a new kind of activity in the future, high\|performance materials bridge engineering, there will be good economic and use value. This study uses “Midas” software modeling analysis in Xiping railway bridge in the omo valley poses the design and application of coal ash concrete compared the RPC concrete hollow thin\|wall piers and traditional pier stiffness, strength, especially in the construction, a systematic analysis of structural mechanics data pier. Discusses the RPC concrete hollow thin-wall piers in railway bridge in the application of the stiffness, puts forward the reasonable design scheme and technical measures.   Related Articles | Metrics

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Comparison of Soil Dielectric Constant-Water Content Models LIU Hua gui， ZENG Jian 2011, 25 (2):  58.  Abstract ( 3685 )   Save The Time Domain Reflectometry(TDR) used to estimate soil water content was based on the relationship of soil dielectric constant\|water content. Errors of Topp model, Mixing model and Diffusion model were analyzed with test results. Test results show that parameters of Mixing model and Diffusion model are too randomly to be determined, but parameters of Topp model with neglecting the forms of soil component can be used in engineering with proper revising in despite of the error in the model. Related Articles | Metrics

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Deformation Regularity During Shallow Buried Tunnel Construction in Urban YANG Li min1， HU Jian hua1, ZHOU Ke ping1, HE Li hong2 2011, 25 (2):  61.  Abstract ( 2200 )   Save The surrounding soil mass was disturbed by the construction of urban shallow buried tunnel, then there was the differential settlement and collapse of surface, in which the influence of its stress pass was obvious, meanwhile the ground traffic and architectures were also disturbed. Therefore the soil layer deformation induced by the stress path of tunnel construction was studied by using ANSYS to simulate the excavation sequences of different tunnels. Based on the tunnel engineering in Wuhan, the deformation of disturbed soil was analyzed and its regularity was obtained. Related Articles | Metrics

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Analysis on Bearing Capacity of Bucket Foundation in Soft Soil Ground under Horizontal Load LI Hua luan 2011, 25 (2):  65.  Abstract ( 2956 )   Save The bucket foundation is an advanced technology in coastal and offshore engineering recently. The three\|dimension finite element model of bucket foundation was established by using the finite element analysis software ABAQUS and the limit equilibrium theory. The horizontal bearing capacity of bucket foundation and the distributions of earth pressure along outside of bucket foundation under horizontal load were studied by using the displacement controlled method, in which some factors were considered such as soil characteristics and length to diameter ratio of bucket foundation. Results show that the bucket foundation rotates with the center of one\|third bucket length to the bottom, meanwhile the earth pressure is maximum outside of the bucket at this point. And the influence of soil characteristics is not greater than that of length to diameter ratio on the horizontal bearing capacity of bucket foundation. Related Articles | Metrics

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Discussion on Some Problems of Retaining Wall Design ZHANG Ming, HUANG Bi zhang, CHEN Wei 2011, 25 (2):  69.  Abstract ( 2503 )   Save The material selection, structural type, calculation parameters in design and stability influent factors of retaining wall was analyzed and compared with the codes, which was as the preference for similar design. References | Related Articles | Metrics

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Embedded depth Calculation of Retaining Structure FU Zhi feng1， WU Xiao yun1, LIU Fang1, LI Jie2 2011, 25 (2):  72.  Abstract ( 8472 )   Save The embedded depth of retaining structure of pit satisfies not only the anti-heaving stability of pit bottom but also anti-overturning stability of retaining structure. Based on codes, the calculating difference of embedded depth was analyzed with the some methods including elastic method, arc-slippage method, arc-slippage method considered the horizontal brace force and empirical law of the code. Then the acceptable range of embedded depth was proposed considered the discreteness of soil mechanical property. Related Articles | Metrics

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Engineering Geological Evaluation of Lugu Lake Airport WANG Qi, HAN Wen xi 2011, 25 (2):  76.  Abstract ( 2624 )   Save There are many engineering geological problems in the Lugu Lake Airport, which influenced its construction, the major engineering geological problems were evaluated and related proposals were provided as reference. Related Articles | Metrics

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Some Problems and Related Measurements of Deep Horizontal Displacement Monitoring in Soft Soil Subgrade with High Embankment MA Hong min1, DU Xing wu2, XIN Jun sheng3, WANG Lan lan4 2011, 25 (2):  80.  Abstract ( 2833 )   Save Based on the monitoring of deep horizontal displacement in soft soil subgrade with high embankment in southwest region, there were some problems to monitoring its deep horizontal displacement by the conventional method. According to its characteristics such as high embankment, low bearing capacity and the different lateral deformation, some improving measurement were proposed including the location chosen of inclinometer inbuilt, backfilling of inclinometer hole, treatment of deflection and twist, error control, compatible deformation analysis, which was as the preference for similar engineering in southwest region. Related Articles | Metrics

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Application of Point Measurement with Ground Penetrating Radar in Detecting the Karst Cave under Bridge Pile Foundation WU Ke1, MA Ming yue2, LI Shu cai1, ZHANG Le wen1 2011, 25 (2):  83.  Abstract ( 2303 )   Save  In order to avoid the geological casualty induced by the development of karst for bridge pile foundation construction, the ground penetrating radar(GPR), a new electromagnetic method and its basic principles and techniques and the selection of correlative parameters in detection were introduced, was used to study the location and scale of karst caves by point measurement based on an actual project. Then the ground penetrating radar image was analyzed. Study showed that the location and scale of karst cave under the bridge pile foundation was detected by GPR, which was provided as the reference for its treatment. Related Articles | Metrics

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Application of Magnetic Gradient Method in Length Testing of Reinforcement Steel Cage in Drilled Pile ZHANG Jian lu1, WANG Hai ming2, SUN Xiu rong3, ZHAO Zhu zhan3 2011, 25 (2):  86.  Abstract ( 2203 )   Save During the construction of pile foundation, the potential quality trouble was resulted from the shortage of reinforcement steel cage in the drilled pile. The geophysical magetic gradient method was used to test the reinforcement steel cage's number and its length, and the result was satisfied. Related Articles | Metrics