地铁深基坑渗流应力耦合研究

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Abstract Research purposes:The 90% accident of deep foundation pit in Wuhan were caused by failing control of underground water． The confined water aquifer commonly exists in the first Yangtze River＇s terrace with thick aquifer and high water head． This is an important feature of the deep foundation pit project in Wuhan． Therefore，studying the ground settlement caused by precipitation and excavation，the stability of the foundation pit and the change law of ground settlement has the important practical significance for the deep foundation pit project in Wuhan．

Research conclusions:The fluid － solid coupling effect of precipitation and excavation of deep foundation pit was analyzed and the coupling calculation model for the seepage field and stress field was established．The seepage － stress coupling simulation for the precipitation and excavation of the deep foundation pit in the first Yangtze River＇s terrace was carried out with FLAC3D．The calculation result showed that the the ground settlement formed a settlement groove of quadratic function curve，the seepage velocity was fastest under the diaphragm wall where the seepage and sabotage was easy to happen，and compared to the calculation with no coupling，the calculation result with coupling was more identical with the actual law and it could play a better role in prediction and informatization construction．

Key words： metro foundation pit the first Yangtze River＇s terrace fluid － solid coupling FLAC3D

Received: 28 March 2011

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U231

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	YAN Yong

Cite this article:

YAN Yong. Research on Seepage Stress Coupling of Metro Deep Foundation Pit[J]. 铁道工程学报, 2011, 28(6): 92-97.

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http://tdgcxb.crec.cn/EN/ OR http://tdgcxb.crec.cn/EN/Y2011/V28/I6/92

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