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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第34卷

期数:

2012年第04期

页码:

88-94

栏目:

工程地质

出版日期:

2012-12-20

文章信息/Info

Title:

Study on Slope Stability of Granite Residual Soil Cutting Excavation with Rainfall

作者:

邓通发¹; 2; 桂勇³; 罗嗣海¹; 周军平⁴

1.江西理工大学 建筑与测绘工程学院,江西 赣州 341000; 2.广州大学 土木工程学院,广东 广州 510006; 3.江西理工大学 应用科学学院,江西 赣州 341000; 4.赣州高速公路有限责任公司,江西 赣州 341000

Author(s):

DENG Tong-fa¹; 2;  GUI Yong³;  LUO Si-hai¹;  ZHOU Jun-ping⁴

1. School of Architectural and Surveying and Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China; 2. School of Civil Engineering, Guangzhou University, Guangzhou 510006,Guangdong, China; 3. School of Applied Science, Jiangxi University of Science and Technology, Ganzhou341000, Jiangxi, China; 4. Ganzhou Expressway Co., Ltd., Ganzhou 341000, Jiangxi, China

关键词:

边坡;  稳定性;  滑坡;  渗流;  基质吸力;  极限平衡法;  有限元法;  残坡积土

Keywords:

slope;  stability;  landslide;  seepage;  matric suction;  limit equilibrium method;  finite element method;  residual soil

分类号:

P642; U416.1⁺4

DOI:

-

文献标志码:

-

摘要:

基于多孔介质饱和—非饱和渗流理论和非饱和土抗剪强度理论,采用极限平衡法与降雨渗流有限元相结合的方法,选取大庆—广州高速公路江西里仁—龙南段某典型高路堑边坡,利用岩土仿真软件GeoStudio建立模型,研究降雨条件下花岗岩残坡积土路堑边坡失稳破环的形态和机理。结果表明:随着降雨的进行,边坡中地下水位从坡脚处开始抬升,边坡坡脚处容易产生“小弧”滑动破坏; 土体体积含水量的增加使得基质吸力下降,从而降低土体强度和边坡的安全系数,且基质吸力与安全系数的下降幅度基本同步; 降雨强度对边坡的安全系数有较大影响,小雨阶段,安全系数降幅较缓,而暴雨阶段,安全系数降幅加剧,降幅达24.4%; 在强降雨条件下,滑面基质吸力大部分丧失,失稳边坡发生了从整体失稳向局部失稳、从深层失稳向浅层失稳的转变,即强降雨是浅层滑坡的主要外在因素。

Abstract:

Based on saturated-unsaturated seepage theory and unsaturated soil shear strength theory, a typical high cutting excavation slope in Jiangxi Liren-Longnan Section of Daqing-Guangzhou Expressway was selected, the model was built by the simulation software GeoStudio, and the shape and mechanism of slope instability of granite residual soil cutting excavation with rainfall were studied by the means of limit equilibrium method and finite element method of rainfall infiltration. The results showed that groundwater table rose from the bottom of slope and “small arc” instability easily happened in the bottom with rainfall; the increase of volumetric moisture content deceased the matric suction, and thereby deceased soil strength and safety factor of slope, and the decreases of matric suction and safety factor were synchronized; rainfall intensity had significant effect on safety factor of slope, safety factor decreased slowly with light rain and decreased quickly with rainstorm, and the most decease was 24.4%; matric suction of slide surface mostly lost with heavy rain, slope instability happened from whole to local instability and from deep to shallow instability, so that the strong rainfall was main extrinsic factor of shallow landslide.

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备注/Memo

备注/Memo:

收稿日期:2012-06-18
基金项目:国家自然科学基金项目(51264008); 江西省交通厅科技项目(2012C0003,2011H0023)
作者简介:邓通发(1980-),男,江西兴国人,江西理工大学讲师,广州大学工学博士研究生,E-mail:dbdtf@163.com。

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更新日期/Last Update: 2012-12-20