Numerical Simulation Study on the Distribution Characteristics of Precipitation Seepage Field in Water-Rich Ultra-Thick Sand and Gravel Layer

被引:3
作者
Li, Da [1 ]
Cheng, Shukai [1 ]
Liu, Ningyi [1 ]
Liu, Zhongxin [2 ]
Sun, Yinghao [1 ]
机构
[1] Henan Univ Sci & Technol, Sch Civil Engn & Architecture, Luoyang 471023, Peoples R China
[2] China Railway 15th Bur Grp Corp Ltd, Luoyang 471023, Peoples R China
关键词
sand and gravel layer; seepage field; pore water pressure; flow velocity; water inflow; suspended water-stop curtain; DEEP FOUNDATION PIT; SEMIANALYTICAL METHOD; PUMPING TEST; SUBSIDENCE; TUNNEL; EXCAVATION; BARRIER; INFLOW; WALL; DIFFERENCE;
D O I
10.3390/w15213720
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The distribution characteristics of a seepage field generated by precipitation affects the deformation damage of the geological body and engineering geological stability, especially a seepage field with a water-rich ultra-thick sand and gravel layer. In order to study the seepage field distribution characteristics of a water-rich ultra-thick sand and gravel layer, taking Luoyang Metro Line 1 as the engineering background, combined with the actual monitoring data of on-site precipitation, numerical simulation was used to study the seepage characteristics of the pit project precipitation with a suspended water-stop curtain. Through the study, the distribution characteristics of the seepage field under different precipitation depths and aquifer thicknesses were obtained, and the changes in pore water pressure characteristics, flow velocity and water inflow, depending on the precipitation depth and aquifer thickness, were analyzed. The research results show that, when comparing the calculated and measured results of the water level drop in the foundation pit, the average value of the error of the water level drop value in the pit and the descending well is 11.7%, which indicates that the calculation model meets the needs for its use in calculation and analysis. Under the conditions of a suspended water-stop curtain and precipitation, for the pore water pressure characteristics, the variation amplitude of the pore water pressure inside the pit increases with the precipitation depth and aquifer thickness. For the maximum flow velocity, all characteristics are present at the bottom of the suspended water-stop curtain, near the inside of the pit. The maximum flow velocity increases linearly with the precipitation depth and there is a threshold when the aquifer thickness is five times the precipitation depth. For water inflow, it increases with the increase in the precipitation depth and aquifer thickness, but, with a continuous increase in the aquifer thickness, the magnitude of water inflow growth decreases.
引用
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页数:18
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