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当前位置: 首页 > 文章 > 溯源侵蚀作用下昔格达地层土质边坡的稳定性 水土保持通报 2014,34 (5) 25-28+33
Position: Home > Articles > Earth Slope Stability of Xigeda Strata Under Headward Erosion Bulletin of Soil and Water Conservation 2014,34 (5) 25-28+33

溯源侵蚀作用下昔格达地层土质边坡的稳定性

作  者：
王英杰;朱宝龙;郭华伟;俞艳
单  位：
西南科技大学土木工程与建筑学院
关键词：
溯源侵蚀;稳定性;非饱和土;昔格达地层
摘  要：
对四川省昔格达地层土体工程地质特性进行了分析。结果发现,昔格达土体化学成分丰富,含有一定量的易溶盐,在地下水及地表水的作用下易于发生化学反应,形成次生矿物,使土体强度降低,导致边坡易于产生失稳现象;溯源侵蚀为河流侵蚀的一种类型,水流的侧向冲刷与重力同时作用于沟谷边坡,加快沟谷边坡的失稳速度。运用水力学、土力学等力学方法对溯源侵蚀的主要影响因素进行了分析。在非饱和土计算模型基础上,建立了昔格达地层沟坡物理概化模型。模型在考虑了河流的侧向冲刷,沟坡重力作用的基础上,同时考虑动水压力作用对边坡的影响。针对目前非饱和土抗剪强度计算并不统一的情况,推导并优化了非饱和土边坡稳定性计算公式。并结合建立的溯源侵蚀模型对昔格达地层土质坡稳定性进行了分析,求得边坡稳定性系数为1.061,而采用经典的Bishop法求得相同条件下边坡稳定性系数为1.212。结果表明,优化的边坡稳定性求解方法得到的稳定安全系数较低。
译  名：
Earth Slope Stability of Xigeda Strata Under Headward Erosion
作  者：
WANG Ying-jie;ZHU Bao-long;GUO Hua-wei;YU Yan;School of Civil Engineering and Architecture,Southwest University of Science and Technology;
关键词：
headward erosion;;stability;;unsaturated earth;;Xigede strata
摘  要：
Engineering geological characteristics of Xigeda strata in Sichuan Province was analyzed.Xigeda strata has multiple chemical composition that contains a certain amount of soluble salt,and tends to bring about chemical reaction and forms secondary minerals when submerged in ground water or surface water.This may reduce the strength of Xigeda strata and cause slope instability.Headward erosion is a kind of river erosion,and if the flow of the lateral erosion and gravity act on the slope at the same time,it would accelerate the instability velocity of slope.The main factors affecting headward erosion were analyzed using mechanical methods of soil mechanics,hydraulics etc.A generalized physical model of Xigeda strata slope was established on the basis of the unsaturated soil calculation.In order to make the model more accurate and reliable,the model took river lateral scouring and hydrodynamic pressure into consideration.Since the present unsaturated soil shear strength calculation was not unified,the stability calculation formulas of unsaturated soil slope was deduced and optimized.The stability of Xigeda strata slope was analyzed based on the headward erosion model,and the calculated stability coefficient of slope was 1.061,but slope stability coefficient under the same conditions was 1.212 using classical Bishop method.Because the coefficient calculated by the optimization calculation formula was lower.

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