陡倾片麻岩滑坡演化过程研究——以兰陵溪滑坡为例
Study on evolution process of steeply dipping gneiss landslides:case of Lanlingxi Landslide
王建平 1马思哲 1党超1
作者信息
- 1. 三峡大学 三峡库区地质灾害教育部重点实验室,湖北 宜昌 443002;三峡大学 土木与建筑学院,湖北宜昌 443002
- 折叠
摘要
弯曲-倾倒破坏是陡倾顺层岩质斜坡的一种变形模式,当其折断面贯通形成滑移面时,斜坡演化为滑坡.以三峡库区兰陵溪滑坡为例,引入反转应力法、梁板强度理论对滑坡变形模式与演化过程进行了研究.结果表明:①该岩质斜坡具有典型的陡倾顺层、岩体结构软硬相间的特点,为其发生弯曲-倾倒破坏提供了先天性条件.②差异性风化是兰陵溪滑坡发生弯曲-倾倒变形的主要原因,片状片麻岩抗弯强度变弱,促使片麻岩逐渐发生弯曲,最后产生弯曲折断-倾倒变形破坏.③兰陵溪滑坡演化过程历经差异性风化、岩层弯曲变形、岩层倾倒破坏、折断面贯通等4 个阶段,所有折断面贯通形成潜在滑移面时,斜坡演化为滑坡.研究成果可为该滑坡工程治理提供理论依据,也可为同类型岩质斜坡治理提供思路.
Abstract
Bending-toppling failure is a deformation mode of steeply dipping stratified rock slopes.When its fracture surface penetrates to form a slip surface,the slope evolves into a landslide.Taking the Lanlingxi Landslide in the Three Gorges Reservoir area as an example,the inverse stress method and beam-slab strength theory were introduced to study the landslide deformation mode and evolution process.The results show that:① The rocky slope has the typical characteristics of steeply dipping stratified layer and hard-soft-integrated rock structure,which provides innate conditions for the occurrence of bending-toppling failure.② Differential weathering is the main reason for the bending-toppling deformation of the Lanlingxi Landslide.The bending strength of the lamellar gneiss is weak,which contributes to the gradual bending of the gneiss,and finally,the bending-fracture-toppling deformation failure happens.③Lanlingxi Landslide evolution process had gone through the differential weathering stage,gneiss bending and deformation stage,gneiss toppling deformation and destruction stage,fracture surface penetration,etc.When all the fracture surfaces penetrated to form potential slip surfaces,the slope evolved into a landslide.The research results can provide a theoretical basis for the engineering management of this landslide,and can also provide new ideas for the management of the same type of rocky slopes.
关键词
陡倾顺层岩质斜坡/弯曲-倾倒破坏/软硬相间/差异性风化/反转应力法/梁板强度理论/兰陵溪滑坡/三峡库区Key words
steeply dipping stratified rock slope/bending-toppling failure/hard-soft alternated rock structure/differential weathering/inverse stress method/beam-slab strength theory/Lanlingxi Landslide/Three Gorges Reservoir area引用本文复制引用
基金项目
国家自然科学基金青年基金(41701013)
出版年
2024
国家科技期刊平台
NSTL
万方数据