顺层倾倒工程地质研究课程报告.pdfVIP

陡倾顺层岩质边坡倾倒变形的工程地质研究 林必挺 摘要：倾倒变形是河谷地区层状岩质边坡破坏的一种主要形式。传统意义上人们 认为倾倒变形多发育在反倾岩层边坡中，岩层在自重力作用下做 “悬臂梁弯曲” 进而产生破坏。但是在工程建设中发现顺层岩质边坡在一定条件下也会发生倾倒 破坏。这类顺层倾倒变形体有如下特征①岩性上发育在软硬互层力学性质相差较 大的层状岩体中或者岩性力学性质较差的软岩中。②岩层倾角较陡，一般大于 60°。③多发育在高陡斜坡，尤其是快速下切的河谷中。本文总结了顺层倾倒变 形的分类，根据前人研究资料并结合本人的观点分析了顺层倾倒变形可能的成因 机理。 关键词：顺层岩质边坡；倾倒变形；成因机理 Engineering-geological study on the toppling deformation of steep bedding rock slope Bilton Lin Abstact ：Toppling deformation is one of the most typical kinds of deformation and failure mode of layered rock slopes in river valley.Traditionally,it is highly-recognized that most of the toppling deformation generate in the anti-dip layered rock slopes,the layered rock bends under self-gravity as a cantilever beam,which leads to rock failure.However,it is found that the layered rock slopes tend to break off under the certain circumstance in the process of engineering construction.The characteristics of this kind of layered toppling deformation are chiefly as follows①it generally grows in soft and hard layered rock,which mechanical properties of rock differentiate greatly.Or it just occurs in soft rock in terms of rock properties.②the bedding dip of the rock stratum is usually bigger than 60°.③it grows in the high-steep rock slopes,especially in the quick incised river valley.This paper summarizes the classification of bedding rock slopes,and the paper analyses the possible mechanisms of the toppling deformation according to the study of predecessors. Key words:bedding rock slope ；toppling deformation ；mechannism 形进行了大量的研究。最典型的是 0 引言 Goodman 和Bray 的研究，他们将该类 倾倒变形指的是反倾或者部分陡 倾倒变形分为 3 种基本类型及次生倾 倾顺层岩质斜坡表层岩体在内外动力 倒，即弯曲倾倒、块状倾倒及块状弯 地质作用或者人工活动下发生蠕动变 曲倾倒；次生倾倒是由于一种由于边 形而向临空面一侧做“悬臂梁弯曲” 坡的其它破坏形