基于DEM-CFD方法的基坑工程漏水漏砂引发地层运移规律的数值模拟

doi:10.13722/j.cnki.jrme.2018.0933

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Abstract With the large-scale development of underground space，the hazards induced by leakage of groundwater and sand in excavations occur frequently. DEM-CFD method was adopted to simulate the process of this kind of hazard. The microscopic parameters of soil and fluid were determined based on laboratory tests，biaxial model of the particle flow code and seepage model. A numerical analysis model was developed to research the laws of ground movement，ground loss and ground stress field due to the leakage of groundwater and sand. Two typical strata including water-rich sand stratum and water-rich sand layer overlying clay stratum were considered. The results show that，for the water-rich sand stratum，the leakage of groundwater and sand induces a settlement trough on the ground surface outside the excavation，the maximum value of ground surface settlement is proportional to the soil mass loss ratio，and the leakage of groundwater accelerates the ground loss and results in the concentrated movement of ground towards the leakage point. It is also indicated that，for the water-rich sand layer overlying clay stratum，there exists a critical soil mass loss ratio leading to the crack of the ground surface，and the thicker the clay layer，the greater the critical soil mass loss ratio is. Furthermore，the ground around the leakage point could be divided into hollow area，loose area，main tensile stress area and complex stress area. The results of the research provide a reference for the hazard control and delicacy management during the leakage of groundwater and sand in excavations.

Key words： foundation pit engineering soil arch engineering hazards discrete element method numerical modeling

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	Articles by authors
	DAI Xuan1
	ZHENG Gang2
	3
	CHENG Xuesong2
	3
	HUO Haifeng1

Cite this article:

DAI Xuan1,ZHENG Gang2,3, et al. Numerical simulation of ground movement induced by leakage of groundwater and sand in excavations based on the DEM-CFD method#br#[J]. , 2019, 38(2): 396-408.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.0933 OR http://www.rockmech.org/EN/Y2019/V38/I2/396

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