Field test on bearing characteristics of diaphragm walls under high water pressure at floodplain of Yangtze River
WANG Xinquan 1，CUI Yunliang1，ZHANG Shimin1，SHI Qingtao2，LI Bing2
(1. Department of Civil Engineering，Zhejiang University City College，Hangzhou，Zhejiang 310015，China；
2. China Railway 14th Construction Bureau Co.，Ltd.，Jinan，Shandong 250022，China)
Abstract：The field test was carried out to the foundation pit at Mei-zi-zhou river-crossing tunnel on Metro Line of Nanjing Youth Olympic Games. The lattice shaped and conventional diaphragm walls were constructed in the ground with high pressure water at Yangtze River floodplain. The variations of lateral displacement at wall top，the horizontal displacement along wall depth，the surface settlement and the axial forces of supporting with the excavation of foundation pit and time were measured and studied respectively. The lateral displacement at the wall top rebounds after the setup of supporting，which is mainly influenced by the supporting installation，pre-axial force and demolition. The deep lateral displacements at the lattice shaped and conventional diaphragm walls tend to form a ‘bulging belly? shape，and the maximum deep lateral displacement on both kinds of walls can be found in the middle-upper region of the buried depth. In the early stage of pit excavation，there is a slight surface heave in the lattice shaped diaphragm walls，whereas there is no surface heave but a large settlement in the conventional diaphragm walls. However，the ground settlements are gradually decreased with the increase of the distance away from the walls. The differential settlements away from the walls tend to increase in the late stage of foundation pit excavation.
王新泉1，崔允亮1，张世民1，史庆涛2，李 兵2. 长江漫滩高承压水地基地连墙承载特性现场试验研究[J]. 岩石力学与工程学报, 2017, 36(3): 773-780.
WANG Xinquan 1，CUI Yunliang1，ZHANG Shimin1，SHI Qingtao2，LI Bing2. Field test on bearing characteristics of diaphragm walls under high water pressure at floodplain of Yangtze River. , 2017, 36(3): 773-780.
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2017, Vol. 36 
