考虑降雨影响的深基坑边坡稳定性分析

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2019 年 3 月 第 3 期 总第 553 期
水运工程 Port & Waterway Engineering
Mar������ 2019 No������ 3 Serial No������ 553
考虑降雨影响的深基坑边坡稳定性wenku.baidu.com析∗
颜方方1ꎬ 黄伦超1ꎬ 周千凯2ꎬ 邓凌谨3
(1������ 长沙理工大学 水利工程学院ꎬ 湖南 长沙 410114ꎻ 2������ 湖南省交通规划勘察设计有限公司ꎬ 湖南 长沙 410008ꎻ 3������ 湖南省水运建设投资集团有限公司ꎬ 湖南 长沙 410011)
下水位线不断上升ꎬ 基质吸力逐渐消散ꎬ 坡体表面形成暂态饱和区ꎬ 安全系数随之减小ꎮ 降雨停止后ꎬ 水分逐渐流出坡体ꎬ
含水量逐渐减小ꎬ 地下水位随之逐渐下降ꎬ 正孔压减小ꎬ 基质吸力逐渐恢复ꎬ 安全系数逐渐增大ꎮ 降雨入渗对边坡浅层土
体影响较大ꎬ 对深层土体影响较小ꎬ 一般形成浅层破坏ꎮ
关键词: 降雨入渗ꎻ 孔隙水压力ꎻ 边坡稳定ꎻ 有限元分析
Abstract Taking the deep foundation pit slope of second ̄line ship lock for Dayuandu navigation ̄power
junction as an example combined with the saturated ̄unsaturated theory this paper establishes a two ̄dimensional numerical model by seep∕w module and slope∕w module in the finite element software Geo ̄Studio to analyze the seepage state of the slope under heavy rainfall through which the change of variation of water content and pore water pressure inside the slop the safety factor and the variation of the slip surface are obtained������ The results show that with the increase of rainfall duration the slope moisture content increase gradually the rainwater continues to infiltrate into the deeper soil the groundwater level rises continuously the matrix suction gradually dissipates the surface of the slop forms a transient saturation zone and the safety factor decreases������ After the rainfall stopped the water gradually flowed out of the slop the water content gradually decreased the underground water level decreased gradually and the positive hole pressure decreased the matrix suction gradually recovered and the safety factor increased gradually������ Rainfall infiltration has a great influence on the shallow soil of the slope has little effect on the deep soil and forms shallow damage generally.
2������ Hunan Provincial Traffic Planning Survey & Design Institute Co. Ltd. Changsha 410008 China 3������ Hunan Water Transport Construction Investment Group Co. Ltd. Changsha 410011 China
摘要: 以大源渡航电枢纽二线船闸基坑工程为例ꎬ 结合饱和-非饱和理论ꎬ 通过有限元软件 Geo ̄Studio 中 seep∕w 模块和
slope∕w 模块建立二维数值模型ꎬ 对强降雨情况下边坡渗流状态进行分析ꎬ 得到边坡内部含水率和孔隙水压力变化规律以及
安全系数和滑裂面的变化情况ꎮ 结果表明: 随着降雨历时的增加ꎬ 坡面含水率逐渐增加ꎬ 雨水不断向更深层土体入渗ꎬ 地
Keywords rainfall infiltration pore water pressure slop stability finite element analysis
中图分类号: U 641
文献标志码: A
文章编号: 1002 ̄ 4972(2019)03 ̄ 0024 ̄ 05
Stability analysis of deep foundation pit slope considering rainfall impact
YAN Fang ̄fang1 HUANG Lun ̄chao1 ZHOU Qian ̄kai2 DENG Ling ̄jin 3 1������ School of Hydraulic Engineering Changsha University of Science & Technology Changsha 410114 China
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