降雨条件下植物根系加固边坡稳定性分析  

Analysis of slope stability enhanced by plant roots under rainfall conditions

作　　者：吕海军 李健宏 曹爱民 樊海辉 王元博 林杭[2] LYU Haijun;LI Jianhong;CAO Aimin;FAN Haihui;WANG Yuanbo;LIN Hang(CCCC(Baise)North Ring Highway Investment Construction Co.,Ltd.,Baise 533699,Guangxi,China;School of Resources and Safety Engineering,Central South University,Changsha 410083,Hunan,China)

机构地区：[1]中交(百色)北环高速公路投资建设有限公司,广西百色533699 [2]中南大学资源与安全工程学院,湖南长沙410083

出　　处：《水利水电技术(中英文)》2024年第S2期656-660,共5页Water Resources and Hydropower Engineering

摘　　要：植物根系通过与土体相互作用,提高土体的抗剪强度、改善土体结构并减缓雨水冲刷,在降雨条件下,能有效增强边坡的稳定性。采用数值分析方法构建边坡计算模型,对比植物护坡和无护坡条件下边坡安全系数的变化情况,分析降雨条件下植物加固边坡稳定性的演化规律,研究植物护坡的加固效应,得到:(1)降雨初期,天然边坡安全系数持续下降,达到极值点后开始回升。(2)降雨条件下植物护坡的边坡安全系数变化规律与天然边坡类似,但植物护坡稳定性明显大于天然边坡。(3)根系加筋作用的力学效应明显,降雨条件对植物加固边坡失稳时的潜在滑面影响小于无护坡边坡。(4)植物护坡坡面不同高度处孔压均在降雨初期急剧上升,但降雨中后期上升幅度较小且基本不变;随着降雨强度下降及降雨停止,孔压逐渐下降。蒸腾作用期间,孔压下降幅度较小且基本不变。By interacting with soil,plant roots can improve the shear strength of soil,improve the structure of soil and slow down the erosion of rain,etc.,which can effectively enhance the stability of slope under rainfall conditions.This study uses numerical analysis method to construct a slope calculation model and compares the changes in slope safety factor under plant slope protection and unprotected conditions to analyze the evolution law of slope stability enhancement by plant roots under rainfall conditions and study the slope protection effect of plants.The result are as follows:(1)The natural slope safety factor continued to decline in the early stages of rainfall,reached a minimum point,and then began to rise.(2)The slope safety factor change law of the plant slope protection under rainfall conditions is similar to that of the natural slope,but the stability of the plant slope protection is significantly greater than that of the natural slope.(3)The mechanical effect of root reinforcement is obvious,and the influence of rainfall conditions on the potential sliding surface of the plant-reinforced slope is much less than that of the slope without protection.(4)The pore pressure at different heights of plant slope protection increased sharply in the early period of rainfall,but the rise was small and basically unchanged in the middle and late period of rainfall.The pore pressure decreased gradually with the decrease of rainfall intensity and the stop of rainfall.During transpiration,the pore pressure decreased slightly and remained unchanged.

关 键 词：边坡 稳定性 降雨 植物护坡 安全系数 

分 类 号：TV734.1[水利工程—水利水电工程]