杭州软黏土地区某30.2 m深大基坑开挖性状实测分析

doi:10.13722/j.cnki.jrme.2020.0636

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Abstract Taking a 30.2 m deep and large basement excavation in Hangzhou soft clay as the research object，the excavation performances，including the stress of diaphragm walls，the displacement of columns，the axial force，the earth pressure and the settlements of ground surface，are thoroughly investigated based on 16 excavation cases collected in Hangzhou and the data published in literature about similar excavation in Shanghai. Following conclusions are obtained：(1) The location of the maximum wall deflection is between He－5 and He + 2.5. Benefiting from the excellent integrity of the retaining system，the maximum wall deflection is well controlled with an average value of 0.28%He. (2) Due to the“corner effect”，the deflection of the walls located at the excavation center is 3.5 times of that located at the corners，suggesting that the“corner effect”is significant to restrict the deflection for the excavation without adopting the zoned excavation technique. (3) Both the diaphragm walls and the ground surface produce a maximum displacement increment in stage 6 due to the“creep effect”of Hangzhou soft clay and the “depth effect” of deep excavation. The excavation of deep soil can release more stress and induce greater displacement than shallow soil. (4) The horizontal struts mainly carry the load due to the removal of the nearby soil and are slightly influenced by the distant excavation. The transferring of the excavation-induced load to the struts is completed in 1–2 months after strut casting. (5) Different from trapezoid or AEP triangle envelope distribution mode，the horizontal earth pressure behind the diaphragm wall of the considered project is linearly distributed along the depth. The ground adjacent to the excavation surface is more likely in an active state and generates smaller horizontal earth pressure. Based on the 30.2 m deep excavation and the collected 16 similar excavation cases in Hangzhou，an empirical relation between the excavation area and the maximum wall deflection is proposed.

Key words： foundation pit engineering deep-large excavation wall deflection creep effect corner effect excavation area

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	CHENG Kang1
	2
	3
	XU Riqing1
	2
	YING Hongwei1
	2
	4
	LI Binghe5
	GAN Xiaolu1
	2
	QIU Zhijian6
	ZHAN Xiaobo7
	QIN Jianshe6

Cite this article:

CHENG Kang1,2,3, et al. Performance analysis of a 30.2 m deep-large excavation in Hangzhou soft clay[J]. , 2021, 40(4): 851-863.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0636 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I4/851

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