基于灰色关联与模糊数学的重力式挡土墙震害评估  

SEISMIC SAFETY EVALUATION OF GRAVITY RETAINING WALL USING GREY CORRELATION AND FUZZY MATHEMATICS

作　　者：梁力丹[1,2] 郑达[1] 巨能攀[1] 李俊杰[1] 

机构地区：[1]地质灾害防治与环境保护国家重点实验室(成都理工大学),成都610059 [2]中煤科工集团重庆设计研究院有限公司,重庆400016

出　　处：《工程地质学报》2014年第6期1234-1240,共7页Journal of Engineering Geology

基　　金：国家自然科学基金青年基金(41102191);"十二五"国家科技支撑计划(2011BAK12B03)资助

摘　　要：龙门山地区强震荷载导致大量已建边坡支挡结构严重受损,如何对震区受损挡土墙进行震害评估成为亟待解决的技术难点。本文首先通过对研究区挡土墙的震害分析,总结出其主要破坏模式包括滑移破坏、沉降破坏、倾覆破坏、墙身破坏以及越顶破坏5类。然后根据全面性、重要性以及科学性原则对影响震害评价的因子进行定性分析和分类,并结合挡墙的破坏模式,综合分析得到挡土墙安全评估的敏感性因子和一般因子。将震害范围60%作为挡墙评价的敏感性因子,而一般因子分为两级共10个指标,包括:滑移距离,沉降深度,倾斜角度,裂缝数量,裂缝长度比,开裂深度比,开裂宽度,错动距离,垮塌范围,覆盖范围。最后,采用灰色关联分析与模糊数学理论相结合的方法构建挡土墙震害评估体系,从而变事后处理为事先预防,为灾后恢复重建服务。The load of strong motion in Longmen Shan area leads to severely damage of a large number of existing retaining structures.How to do assessment for the damaged retaining walls in the earthquake zone is a problem to be solved urgently.This paper summarizes five types of retaining walls＇ failure modes through the earthquake damage analysis in the research area.They include sliding failure,settlement failure,toppling failure,material failure,and overtopping failure.Then the influence factors of seismic safety evaluation are qualitatively analyzed and classified on the basis of comprehensive principle,important principle and scientific principle.Combining with the failure modes of retaining wall,we put forward the sensitive factor and some general factors.We take the range of 60 percent damage as a sensitive factor.The general factors are divided into two levels and 1 0 indexes including the sliding distance,the settlement depth,the inclination angle,the number of cracks,the ratio of crack length and the retaining wall length,the ratio of crack depth and the retaining wall thickness,the crack width,the dislocation＆nbsp;distance,the range of retaining wall collapsed,the coverage of rock and soil on the retaining wall.Finally,the seismic safety evaluation system of retaining walls is built with grey correlation analysis and fuzzy mathematic theory. We can take prevention instead of post processing,and to serve the post-earthquake recovery and reconstruction.

关 键 词：重力式挡土墙 震害评估 灰色关联 模糊数学 

分 类 号：P642[天文地球—工程地质学]