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《Rock and Soil Mechanics》 2011-S1
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Monitoring analysis of retaining structures for Jiangnan foundation pit of Qingchun road river-crossing tunnel in Hangzhou

ZHANG Xue-chan1,2,GONG Xiao-nan1,2,YIN Xu-yuan3,ZHAO Yu-bo1,2(1.MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering,Zhejiang University,Hangzhou 310058,China; 2.Institute of Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China; 3.Construction Headquarters of Qingchun Road River-Crossing Tunnel,Hangzhou 310016,China)  
It is common to have a foundation pit accident,when failing to deal with the effect of confined water.In order to avoid such accidents,the Jiangnan foundation pit of Qingchun Road River-Crossing Tunnel in Hangzhou was investigated.By analyzing the monitoring data of wall deflection,settlement,confined water level and strut load,we proposed how to deal with high confined water.According to the analysis of on-site monitoring data,it could be obtained that:①The wall deflection is closely related to the plane size of the foundation pit,and through strengthening the stiffness of the central support,the large pit can "be separated" into several smaller pit to control the wall deflection.②The maximum settlement point is 0.5 times depth of the excavation away from retaining wall.③It is useful to treat the confined water with dewatering and cut-off walls,and during excavating the bottom of the foundation pit,we must ensure that the pumping wells keeping working;otherwise the safety of the construction can be affected.④ The load of the first strut becomes smaller and even can be tensile force during excavation.
【Fund】: 国家自然科学基金项目(No.51078377)
【CateGory Index】: U456.3
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