降雨条件下酉阳大涵边坡滑动机制研究

›› 2013, Vol. 34 ›› Issue (10): 2898-2904.

降雨条件下酉阳大涵边坡滑动机制研究

刘新荣，张梁，余瑜，刘坤

1.重庆大学土木工程学院，重庆 400045；2.重庆大学山地城镇建设与新技术教育部重点实验室，重庆 400045

收稿日期:2012-11-27 出版日期:2013-10-09 发布日期:2013-10-18
作者简介:刘新荣，男，1969年生，博士，教授，博士生导师，主要从事岩石力学、边坡、隧道与地下空间工程等方面的教学与科研工作。
基金资助:
2012年度高等学校博士学科点专项科研基金资助课题（No. 20120191110039）；干湿循环作用下岩石劣化宏细观损伤机制研究。

Research on sliding mechanism of Dahan slope in Youyang county under rainfall condition

LIU Xin-rong, ZHANG Liang, YU Yu, LIU Kun

1. College of Civil Engineering, Chongqing University, Chongqing 400045, China; 2. Key Laboratory of New Technology for Construction of Cities in Mountain Area of Education Ministry, Chongqing University, Chongqing 400045, China

Received:2012-11-27 Online:2013-10-09 Published:2013-10-18

摘要/Abstract

摘要： 以某厚堆积层滑坡为例，基于非饱和土力学理论，利用有限元方法，对雨水入渗条件下坡体的渗流及动态稳定性进行了计算和分析，研究了水分在坡体内的运移对边坡稳定性的时间效应。结果表明：边坡堆积体结构松散，土体强度差，边坡前缘坡降大，坡脚的开挖，为滑坡形成提供了便利条件；强降雨条件下使得坡脚附近首先发生变形失稳，牵引坡体后缘产生张拉裂。雨水沿坡面入渗，在坡体内形成渗流场，弱化岩土体参数，同时坡面形成饱和径流，使滑坡体前缘产生向下的渗透力，促使前缘坡体发生滑动，进而引发分级坡体产生滑移；强降雨初始阶段，滑坡体安全系数降低较快，很容易发生滑坡。该研究揭示了降雨入渗诱发厚堆积层边坡滑动机制，并以此建议采取以截、排、堵措施对边坡进行排水，同时设置嵌岩锚索抗滑桩及进行削坡清方措施对边坡进行综合治理，通过稳定性计算，效果良好。

关键词: 非饱和, 弱化, 降雨, 堆积体, 机制

Abstract: Taking a certain thick accumulation landslide for example, and based on the theory of unsaturated soil mechanics, this paper uses the finite-element method to calculate and analyze the slope seepage and dynamic stability under the condition of rainfall infiltration and studies the time effect of water movement in the slope mass on the slope stability. The results show that the loose structure of the slope accumulation body, the poor soil strength, the large gradient at the slope front edge and excavation at the slope toe have provided a convenient condition for landslide formation. Under heavy rainfall, the deformation instability firstly occurred near the slope toe, and then pulled the slope rear edge and caused the tensile fissures. The rainwater infiltrated along the slope surface, formed the seepage field in the slope body and weakened the rock-soil mass parameters. Meanwhile, the saturated runoffs formed on the slope surface generated the downward seepage force on the slope front edge, and promoted the slope front edge to slide and triggered the slippage of the hierarchical slopes. In the initial stage of the heavy rainfall, the safety factor of the landslide mass reduced rapidly, which easily caused the landslide. This study reveals that the rainfall infiltration induced the sliding mechanism of the slope with thick accumulation horizon, based on which, the paper recommends to take the measures of water cut-off, drainage and water plugging to drain off the water, and to set the rock-socketed anchor cable anti-slide pile and taking the measures of slope cutting and cleanup earthwork to control the slope. Good effect results have been obtained through the stability calculation.

Key words: unsaturation, weakening, rainfall, accumulation body, mechanism

中图分类号:

TU 457

刘新荣，张梁，余瑜，刘坤. 降雨条件下酉阳大涵边坡滑动机制研究[J]. , 2013, 34(10): 2898-2904.

LIU Xin-rong, ZHANG Liang, YU Yu, LIU Kun. Research on sliding mechanism of Dahan slope in Youyang county under rainfall condition[J]. , 2013, 34(10): 2898-2904.

参考文献

相关文章 15

[1]	苏永华, 李诚诚. 强降雨下基于Green-Ampt模型的边坡稳定性分析[J]. 岩土力学, 2020, 41(2): 389-398.
[2]	程涛, 晏克勤, 胡仁杰, 郑俊杰, 张欢, 陈合龙, 江志杰, 刘强, . 非饱和土拟二维平面应变固结问题的解析计算方法[J]. 岩土力学, 2020, 41(2): 453-460.
[3]	方瑾瑾, 冯以鑫, 王立平, 余永强, . 真三轴条件下非饱和黄土的有效应力屈服特性[J]. 岩土力学, 2020, 41(2): 492-500.
[4]	邓子千, 陈嘉帅, 王建伟, 刘小文, . 基于SFG模型的统一屈服面本构模型与试验研究[J]. 岩土力学, 2020, 41(2): 527-534.
[5]	李潇旋, 李涛, 彭丽云, . 控制吸力循环荷载下非饱和黏性土的弹塑性双面模型[J]. 岩土力学, 2020, 41(2): 552-560.
[6]	程昊, 唐辉明, 吴琼, 雷国平. 一种考虑水力滞回效应的非饱和土弹塑性扩展剑桥本构模型显式算法有限元实现[J]. 岩土力学, 2020, 41(2): 676-686.
[7]	李剑, 陈善雄, 余飞, 姜领发, 戴张俊. 预应力锚索加固高陡边坡机制探讨[J]. 岩土力学, 2020, 41(2): 707-713.
[8]	赵晓彦, 万宇豪, 张肖兵. 汶马高速公路千枚岩堆积体岩块定向性试验研究[J]. 岩土力学, 2020, 41(1): 175-184.
[9]	史吏, 胡东东, 蔡袁强, 潘晓东, 孙宏磊, . 增压式真空预压吹填淤泥孔压实时响应及加固机制初探[J]. 岩土力学, 2020, 41(1): 185-193.
[10]	于丽, 吕城, 段儒禹, 王明年, . 考虑孔隙水压力及非线性Mohr-Coulomb破坏准则下浅埋土质隧道三维塌落机制的上限分析[J]. 岩土力学, 2020, 41(1): 194-204.
[11]	丑亚玲, 黄守洋, 孙丽源, 王莉杰, 岳国栋, 曹伟, 盛煜, . 基于冻融作用的氯盐渍土−钢块界面力学模型[J]. 岩土力学, 2019, 40(S1): 41-52.
[12]	朱雷, 黄润秋, 陈国庆, 严明, . 岩质斜坡中缓倾角破裂系统形成演化的力学模式研究[J]. 岩土力学, 2019, 40(S1): 53-62.
[13]	楼烨, 张广清. 压裂液黏度对循环水力压裂影响的试验研究[J]. 岩土力学, 2019, 40(S1): 109-118.
[14]	闫国强, 殷跃平, 黄波林, 张枝华, 代贞伟, . 三峡库区巫山金鸡岭滑坡成因机制与变形特征[J]. 岩土力学, 2019, 40(S1): 329-340.
[15]	刘丽, 吴羊, 陈立宏, 刘建坤, . 基于数值模拟的湿润锋前进法测量精度分析[J]. 岩土力学, 2019, 40(S1): 341-349.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed