Deep-seated rock fracture of valley slopes in China:A review  

作　　者：PENG Yi ZHAO Qi-hua HAN Gang CHEN Yu-shu 

机构地区：[1]State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China [2]106 Geological Brigade of Sichuan Bureau of Geology and Mineral Resources,Chengdu 611130,China

出　　处：《Journal of Mountain Science》2023年第7期1984-2002,共19页山地科学学报（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41272333);the National Key Research and Development Program of China(Grant Nos.2011CB013501)。

摘　　要：Deep-seated rock fractures(referred to as DSRF hereafter)in valley slopes are uncommon geological phenomena that challenge our previous understanding of slope unloading processes.These fractures weaken the strength and integrity of the rock mass,potentially forming unstable block boundaries with significant volume,thereby affecting the stability of slopes,chambers,and dam abutments.DSRF has emerged as a critical environmental and engineering geological issue that hinders large-scale projects in deep canyon areas.Despite the attention and practical treatment given to DSRF in engineering practice,theoretical research on this topic still lags behind the demands of engineering applications.To garner widespread attention and promote the resolution of DSRF-related problems,this review aims to redefine DSRF through comprehensive data collection and analysis,engineering geological analogies,and field investigations,and provide a summary and analysis of the research progress on DSRF,along with future research directions.The study defines DSRF as the intermittent tension cracks or relaxation zones within a slightly weathered or fresh,and intact or relatively intact rock mass distributed below the surface unloading zones of a deep canyon slope,and should be distinguished from"loose rock mass"and"deep-seated gravitational slope deformations".The article provides an overview of the development and distribution,rupture characteristics,and genesis mechanism of DSRF.It proposes that DSRF is formed based on the fluvial deviation-undercutting evolution mode,wherein the energy accumulated in the rock mass is violently released when the river further down cuts the slope after the rock mass has undergone cyclical loadingunloading.However,further research is necessary to establish a comprehensive database for DSRF,refine exploration techniques,understand evolutionary processes,develop engineering evaluation methods,and predict the distribution of DSRF.

关 键 词：Deep-seated rock fracture Deep canyon Stress unloading Fluvial deviation-undercutting Formation mechanism 

分 类 号：TU45[建筑科学—岩土工程] P642[建筑科学—土工工程]