| 摘要: |
| 在室内试验资料基础上，提出了土体抗剪强度与降雨入渗时间以及土体含水率的函数关系，修正了考虑土条间相互作用力的简化毕肖普方法，使之能够体现边坡土体含水率变化引起的土体强度降低现象。采用Fortran语言设计平台，开发了耦合饱和－非饱和渗流有限元计算与边坡稳定极限平衡方法（修正的简化Bishop方法）的计算程序，考虑边坡土体抗剪强度参数随着降雨入渗发展、含水率变化而变化，采用饱和-非饱和渗流计算降雨期间边坡土体含水量变化以及扩展过程。计算了物理试验模型在降雨条件下，土坡内部渗流发展过程，以及边坡安全度的变化情况。计算结果与试验结果吻合，与修正前简化Bishop方法计算得到的边坡安全系数相差35％左右。本文提出的计算方法为降雨诱发土质滑坡研究提供了一种新的可供参考的定量分析方法。 |
| 关键词: 降雨入渗 抗剪强度 压力水头 边坡稳定性 |
| DOI： |
| 分类号:P642.22 |
| 基金项目: |
|
| Calculation method for soil slope stability under-the action of precipitation infiltration |
|
XING Xiao-di1, ZHANG Lei2, TAN Ye-fei3, QIU Cheng-chun4, XIE Xing-hua3
|
|
1.Key Laboratory of Navigation Structure Construction Technology, Nanjing Hydraulic Research Institute, College of Water Conservancy and Hydropower, Hohai University;2.Yellow River Shandong Bureau;3.Key Laboratory of Navigation Structure Construction Technology, Nanjing Hydraulic Research Institute;4.Qinghai Yushu Electric Power Development Co., Ltd.
|
| Abstract: |
| Based on the model test data, presenting the soil shear strength parameters and precipitation infiltration time as a function of the moisture content, modifying the simplified Bishop calculation model make it being able to reflect the phenomenon that the strength of the soil mass would be reduced by the change in the moisture content of the slope soil mass. With the aid of Fortran program, a program which is coupling saturated-unsaturated seepage finite element method and limit equilibrium slope stability (a corrected simplified Bishop method) is developed in this study. The program takes into account the slope soil shear strength parameters changed along with the development of precipitation infiltration, using saturated-unsaturated seepage for calculating variation and expansion process of the moisture content of the slope soil mass during rainfall. Through physical model tests, slope seepage in the development process and the process of change in the slope safety degree under the rainfall conditions have been calculated and analyzed. And the calculated results are good in agreement with the experimental research results, which differs by about 35% from the slope safety factor given by the simplified Bishop method before correction. This corrected simplified calculation method for slope stability will provide a new useful reference for the calculation of precipitation induced landslides. |
| Key words: precipitation infiltration shear strength pressure head slope stability |
