基于加速度的边坡和挡土墙稳定性分析  

Stability Analysis of Slopes and Retaining Walls Based on Acceleration

作　　者：介玉新[1] 柏永亮 张彬[2] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084 [2]中国地质大学(北京)工程技术学院,北京100083

出　　处：《地球科学与环境学报》2015年第6期120-126,共7页Journal of Earth Sciences and Environment

基　　金：国家自然科学基金项目(51279085);国家重点基础研究发展计划("九七三"计划)项目(2013CB036402);水沙科学与水利水电工程国家重点实验室项目(2013-KY-4)

摘　　要：评价边坡稳定性可以用最小安全系数,也可以用基于加速度的指标,比如最大加速度、最大惯性力、最大角加速度等。它们可以从另外的角度来看待边坡的稳定和失稳行为。这种思路也可以推广到挡土墙土压力计算。算例计算表明:基于瑞典条分法和简化毕肖甫法的假定对加速度、惯性力和角加速度的计算结果相同,说明它们的计算对条间力的假定不敏感;相对于滑体质心的角加速度不能单独用来判断滑体的稳定情况;对挡土墙土压力来说,由于外部支撑力的引入改变了土条的受力条件,最大惯性力的大小和方向与土压力并没有一致性的关系;随着土的强度参数的不同,最大惯性力可能大于挡土墙土压力,也可能小于土压力;以此类比,根据事先引入支挡结构力的作用方向得到的不平衡推力会更合理。Like the minimum safety factor, the indices based on acceleration, such as the maximum acceleration, maximum inertial force and maximum angular acceleration, can also be emp stab oyed to evaluate the stability of slopes. In fact, they provide the probability to review the lity and instability of slopes from another point of view. This approach can also be extended to studying the soil pressure of retaining walls. Numerical results show that it is the same for the acceleration, inertial force and angular acceleration calculated based on the assumptions of Sweden slice method and simplified Bishop method, respectively, which imply that they are not sensitive to the assumption of forces between slices; the angular acceleration relative to the barycenter of the slip mass can not be independently used to evaluate the stability of slopes; for the soil pressure of retaining wall, due to the external bracing force changes the stress state of slices, the maximum inertial force is not consistent with the soil pressure either in magnitude or in direction; with the different strength parameters of soils, the maximum inertial force may be greater, or less than the soil pressure of retaining wall; analogously, it will be more reasonable to compute the imbalance thrust force of retaining structures by introducing its direction in advance.

关 键 词：边坡 挡土墙 加速度 角加速度 惯性力 安全系数 土压力 条分法 

分 类 号：TU43[建筑科学—岩土工程] P642.116[建筑科学—土工工程]