考虑消落带岩体劣化影响的典型危岩岸坡稳定性研究  

Stability of typical perilous rock bank slope considering the influence of deterioration of rock mass in fluctuation belt

作　　者：刘新荣[1,2,3] 王浩[1,2,3] 郭雪岩[1,2,3] 罗新飏 周小涵 许彬 LIU Xin-rong;WANG Hao;GUO Xue-yan;LUO Xin-yang;ZHOU Xiao-han;XU Bin(School of Civil Engineering,Chongqing University,Chongqing 400045,China;National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas,Chongqing University,Chongqing 400045,China;Key Laboratory of New Technology for Construction of Cities in Mountain Area of the Ministry of Education,Chongqing University,Chongqing 400045,China;School of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆大学库区环境地质灾害防治国家地方联合工程研究中心,重庆400045 [3]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045 [4]重庆交通大学河海学院,重庆400074

出　　处：《岩土力学》2024年第2期563-576,共14页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.41972266);中国博士后科学基金(No.2023M730432);重庆市博士后特别资助(一等)项目(No.2022CQBSHTB1010);重庆市博士后科学基金项目(No.CSTB2023NSCQ-BHX0223);水利水运工程教育部重点实验室开放基金重点项目(No.SLK2023A03)。

摘　　要：三峡库区周期性水位升降引起的消落带岩体劣化对典型危岩岸坡稳定性具有重大影响。基于野外调研及地勘资料,采用通用离散单元法程序(universal distinct element code,简称UDEC)研究了消落带劣化区形态对近水平层状高陡危岩岸坡的稳定性影响。研究表明:目前三峡库区巫山段的近水平层状危岩岸坡消落带岩体劣化严重,在不同消落带劣化区存在紧密层状、松散碎裂状、溶蚀凹腔状、含挤压碎裂带等典型消落带劣化区形态;含有第1种消落带劣化区形态的危岩岸坡稳定性较好,危岩体位移较小,失稳模式为滑移破坏;含有第2种消落带劣化区形态的危岩岸坡危岩体先向坡内偏移,其后随着消落带岩体支撑强度弱化向坡外倾倒破坏;含有第3种消落带劣化区形态的危岩岸坡危岩体向坡外位移较大,失稳模式为倾倒破坏;含有第4种消落带劣化区形态的危岩岸坡稳定性主要受挤压破碎带的力学性质控制,易产生沿破碎带切割面的旋转滑移破坏;通过对以上4种劣化区形态的危岩岸坡增加防治加固措施,危岩体的变形位移得到了不同程度的有效控制。The stability of perilous rock bank slopes in the fluctuation belt of the Three Gorges Reservoir Area is greatly affected by the deterioration of the rock mass caused by periodic water level fluctuations.A study was conducted using field research,geological survey data,and numerical simulation with the universal distinct element code(UDEC) to investigate the impact of degradation zone morphology on the stability of nearly horizontal layered high steep perilous rock bank slopes.The research findings indicate that the rock mass in the fluctuation belt of the Wushan section of the Three Gorges Reservoir Area exhibits severe degradation in nearly horizontal layered perilous rock bank slopes.Different degradation zones exhibit distinct degradation morphologies,including tightly layered,loosely fragmented,dissolution cavity,and compression fractured zones.Perilous rock bank slopes with the first type of degradation zone morphology demonstrate good stability,with minimal displacement and sliding failure as the primary instability mode.The second type of degradation zone morphology causes the perilous rock body of the bank slope to shift inward and then collapse outward as the support strength of the rock mass weakens.The third type of degradation zone morphology leads to significant displacement towards the outside of the slope,with toppling failure as the instability mode.The stability of perilous rock bank slopes with the fourth type of degradation zone morphology is primarily influenced by the mechanical properties of the compressive fracture zone,which is prone to rotational sliding failure along the cutting surface of the fracture zone.By implementing prevention and reinforcement measures on the perilous rock bank slopes in the different types of deterioration zones mentioned above,the deformation and displacement of the perilous rock masses have been effectively controlled to varying degrees.

关 键 词：危岩岸坡 消落带劣化区形态 野外调研 通用离散单元法程序(UDEC) 数值模拟 劣化特征 稳定性 

分 类 号：TV61[水利工程—水利水电工程]