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  2013, Vol. 32 Issue (3): 572-581    DOI:
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STUDY OF STABILITY OF DEEP SHIELD WORKING SHAFT IN SOFT SOIL STRATA UNDER CONDITION OF DEWATERING OUTSIDE SHAFT
ZHAO Wusheng1,CHEN Weizhong1,2,YUAN Kekuo1,ZHENG Pengqiang1,YUAN Jingqiang1, GUO Xiaohong3,SHU Heng3,TUO Yongfei3
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;2. Geotechnical and Structural Engineering Research Center,Shandong University,Jinan,Shandong 250061,China;3. Second Highway Consultants Co.,Ltd.,China Communications Construction Corporation,
Wuhan,Hubei 430056,China)
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Abstract  It is difficult to choose an appropriate calculation method to determine the effective enclosure system in foundation pits design. This case study deals with the excavation of Jiangbei shield working shaft of Weisan road over-river tunnel in Nanjing,which is a typical deep working pit in soft soil strata. The spatial foundation plate method was used to analyze the deformation and stress condition of the structure of the shield working pit under dewatering outside the foundation pits. The m values of strata are obtained through back analysis;and the active and passive areas were judged by the DLOAD subroutine. The calculation results are consistent with the measured results;so the spatial foundation plate method with m values from back analysis can effectively predict the deformation and stress behavior of the enclosure structure. In order to further optimize the structure,three factors,i.e. thickness of diaphragm wall,size of supporting section and m value of soils within 5 m below the floor,are selected for orthogonal array experiment;and the main influencing factors of horizontal displacement of diaphragm wall and axial forces of bracings are obtained. The calculation method and the relevant results can provide references for similar engineering.
Key wordsexcavation engineering      soft soil      dewatering      shield working shaft      diaphragm wall      bracing      parameter analysis     
Received: 17 September 2012     
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