摘要
三维边坡稳定性分析得到的安全系数往往与二维分析存在差异,在以往的研究中,讨论此种差异时很少考虑不同水位的影响,但现实边坡中的失稳几乎都与水相关联,因此本文采用有限元强度折减法,通过改变坡体外水位、边坡宽高比和边坡角等,计算不同参数下边坡的安全系数,探究考虑水位后的三维效应;此外,因影响边坡的因素众多,本文还采用正交设计与灰色关联法对包含水位在内的影响边坡的5个主要因素进行敏感性研究。研究结果表明:安全系数随宽高比W/H增大而减小,在W/H<5时,三维效应不容忽略;随着水位抬升,边坡安全系数减小,但因宽高比增大导致的安全系数变幅也会减小,三维效应有一定的削弱;高坡角的含水边坡稳定性会严重下降,高坡角与高水位对边坡安全系数的削弱效应会相互叠加;同坡角下,水位抬升会使安全系数显著降低;而坡角越小,三维效应越明显;各因素对安全系数的敏感性排序为:内摩擦角>坡角>黏聚力>水位条件>宽高比,但坡角、黏聚力、水位条件的关联度都在0.7左右,极为接近,不可忽视。
The safety factorof 3D slope stability analysis is often different from that of2D stability analysis.In previous studies,the influence of different water levels was rarely considered when discussing such differences,however,the instability of the slopes in reality is almost associated with water.Therefore,this paper uses the finite element strength reduction method to calculate the safety factor of the slope under different parameters by changing thewater level outside the slope,the ratio of width to height and the slope angle,and explores the three-dimensional effect after considering the water level.In addition,because there are many factors affecting the slope,this paper also uses the orthogonal design and grey correlation method to study the sensitivity of the five main factors affecting the slope,including the water level.The results show that the safety factor decreases with the increase of W/H,and the three-dimensional effect cannot be ignored when W/H<5.The uplifting water level will reduce the safety factor of slopes,but the variation of the safety factor due to the increase of W/H will also decrease,and the three-dimensional effect will be weakened.The stability of water-bearing slope with high slope angle will be seriously reduced,and the weakening effect of high slope angle and high water level on slope safety factor will be superimposed on each other.Under the same slope angle,the water level rise will significantly reduce the safety factor;Smaller the slope angle is,more obvious the three-dimensional effect is;The sensitivity of each factor to the safety factor is ranked as follows:internal friction angle>slope angle>cohesion>water level condition>aspect ratio,but the correlation degree of slope angle,cohesionand water level condition is about 0.7,which is very close and cannot be ignored.
作者
李展鹏
王宪杰
高雪莲
雷春雨
袁宗林
王鑫
LI Zhanpeng;WANG Xianjie;GAO Xuelian;LEI Chunyu;YUAN Zongling;WANG Xin(School of Architecture and Planning,Yunnan University,Kunming 650500,China)
出处
《建筑结构》
北大核心
2023年第S02期2647-2652,共6页
Building Structure
基金
国家自然科学基金资助项目(52268037)
云南省教育厅科学研究基金资助项目(2023Y0260)。
关键词
边坡稳定性
三维效应
含水边坡
灰色关联法
正交设计
slope stability
three-dimensional effect
water bearing slope
grey correlation method
orthogonal design
作者简介
第一作者:李展鹏,硕士研究生,主要从事边坡稳定性研究,Email:1195376171@qq.com;通信作者:王宪杰,博士后,副教授,主要从事岩土工程与结构设计,Email:1603987190@qq.com。
