充气截排水渗流与变形耦合数值模拟

doi:10.13278/j.cnki.jjuese.20170225

摘要/Abstract

摘要： 为了探究坡体充气时土体渗流与变形之间的变化规律，利用有限元软件建立厚12 m、长100 m的二维边坡模型，进行渗流-变形的非完全耦合数值模拟，得到对坡体采取充气截排水方法降低地下水位时坡体内充气非饱和区的形成过程，以及坡体表面土体竖向位移的变化过程。结果表明：一个完整稳定的非饱和区形成过程可分为充气初始阶段、非饱和区扩大水位抬升阶段、不稳定两相流阶段和非饱和区稳定阶段，充气压力过大或过小都无法形成稳定完整的非饱和区；当充气压力为100 kPa时，坡体表面土体的竖向位移均随时间呈现先增大后减小的规律，与土体中非饱和区的发展具有一定的协同性；不同充气压力下，偏向充气点上游的坡体表面土体竖向位移随充气压力的增大而增大，偏向充气点下游的坡体表面土体竖向位移的变化具有不确定性。

关键词: 渗流, 变形, 竖向位移, 充气压力, 充气截排水, 数值模拟

Abstract: In order to explore the law of change between seepage and deformation of soil mass while inflating air into a slope, a two-dimensional finite element model of a 12 m-thick and 100 m-long slope was established to perform a non-complete coupled simulation of seepage and deformation. The formation process of unsaturated zone in slope and the change of the vertical displacement of slope surface soil was obtained by using the intercepting water with compressed air method to reduce the underground water level of slope. The result shows that the formation process of a complete and stable unsaturated zone can be divided into initial inflating stage, unsaturated zone expanding and water level rising stage, unstable two-phase flow stage, and stable unsaturated zone stage. If the aerated pressure is too large or too small, a stable and complete unsaturated zone cannot be formed. When the aerated pressure is 100 kPa, the vertical displacement of surface soil increases at first and then reduces. There is a certain synergy with the development of soil unsaturated zone. Under different aerated pressures, the vertical displacement of surface soil upstream to the aerated point increases with the increase of the aerated pressure, and the vertical displacement of surface soil downstream to the aerated point is uncertain.

Key words: seepage, deformation, vertical displacement, aerated pressure, intercepting water with compressed air, numerical simulation

中图分类号:

P642.22

陈永珍, 吴斌, 杨帆, 吴纲, 翁杨. 充气截排水渗流与变形耦合数值模拟[J]. 吉林大学学报(地球科学版), 2019, 49(2): 485-492.

Chen Yongzhen, Wu Bin, Yang Fan, Wu Gang, Weng Yang. Coupled Numerical Simulation of Seepage and Deformation of Interceptingand Drainaging Water with Compressed Air[J]. Journal of Jilin University(Earth Science Edition), 2019, 49(2): 485-492.

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