COMPARISON OF SUPPORTING CHARACTERISTICS OF ROCK-SOCKETED DIAPHRAGM WALLS AND NON ROCK-SOCKETED DIAPHRAGM WALLS IN SOFT SOIL
LIU Nianwu1，2，GONG Xiaonan1，2，TAO Yanli1，2，LOU Chunhui1，2
(1. Research Center of Coastal and Urban Geotechnical Engineering，Zhejiang University，Hangzhou，Zhejiang 310058，China；2. Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education，Zhejiang University，Hangzhou，Zhejiang 310058，China)
Abstract：More and more deep excavations have been constructed to meet the increasing demands of underground infrastructure. The supporting characteristic of rock-socketed diaphragm is different from that in soil due to the different strengths of the bearing layer. Based on the analysis of field data including diaphragm wall deflections，wall settlements and axial forces of struts，the following main findings are obtained. The diaphragm wall deflections using the intermediary weathered rock as bearing layer are larger than those using clay as bearing layer. The maximum lateral displacements of rock-socketed and non rock-socketed diaphragm walls are 0.20%He and 0.32%He，respectively. The diaphragm wall deflections decrease with increasing system stiffness，which is more obvious for the rock-socketed diaphragm. The settlement behind the diaphragm wall is large when the value of x/He is smaller than 2.0(primary influence zone)，but small while the value of x/He is larger than 2.0(secondary influence zone). The axial forces of the first and fourth struts of rock-socketed diaphragm wall are larger than those using clay as bearing layer. In addition，the total support axial force of rock-socketed diaphragm wall is larger 44.9% than that of clay-socketed diaphragm wall.
刘继国，曾亚武. FLAC3D在深基坑开挖与支护数值模拟中的应用[J]. 岩土力学，2006，27(3)：505-508.(LIU Jiguo，ZENG Yawu. Application of FLAC3D to simulation of foundation excavation and support[J]. Rock and Soil Mechanics，2006，27(3)：505-508.(in Chinese))
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2014, Vol. 33 
