库区高陡岸坡防治效果及长期稳定性分析  

Control effect and long-term stability analysis of high and steep bank slope in reservoir area

作　　者：周玉涛 王根 陈小兵 胡敏 Zhou Yutao;Wang Gen;Chen Xiaobing;Hu Min(Chongqing Southeast Sichuan Engineering Survey and Design Institute Co.,Ltd.,Chongqing 400038,China;College of Civil Engineering,Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆川东南工程勘察设计院有限公司,重庆400038 [2]重庆大学土木工程学院,重庆400045

出　　处：《工程勘察》2025年第2期29-37,共9页Geotechnical Investigation & Surveying

摘　　要：箭穿洞高陡危岩岸坡在库水升降作用下,消落带岩体强度降低,存在危岩体失稳风险。基于FLAC3D数值模拟软件对治理前、后危岩体进行静力稳定性评价,并结合现场监测数据对干湿循环下危岩体位移、应力变化进行分析,最后对边坡长期稳定性进行评价。结果表明:治理前的危岩岸坡稳定性系数为1.2,在进行干湿循环作用后,安全系数持续下降,在第五次时稳定性系数仅剩下1.05,降幅达到12.5%,处于欠稳定状态。未治理时,危岩体失稳破坏过程主要表现为裂隙尖端到基座平硐的剪切滑移破坏。防治后危岩岸坡安全系数由1.2提升至2.39,根据监测数据及蠕变数值计算,危岩体总体变形较小,处于稳定状态。建立基于强度折减下的蠕变位移为评价指标的高陡危岩长期稳定性评价方法,治理后的危岩岸坡的长期稳定性系数约为2.0,稳定性较好,治理效果明显。Under the action of reservoir water fluctuation,the strength of rock mass in the water-levelfluctuating zone decreases,and there is a risk of instability of dangerous rock mass.Based on the FLAC3D numerical simulation software,the static stability of the dangerous rock mass before and after the treatment is evaluated,and the displacement and stress changes of the dangerous rock mass under the dry-wet cycle are analyzed combined with the field monitoring data.Finally,the long-term stability of the slope is evaluated.The results show that the stability coefficient of the unstable rock bank slope before treatment is 1.2.After the dry-wet cycle,the safety factor continues to decline.At the fifth time,the stability coefficient is only 1.05,and the decline is 12.5%,which is unstable.Prior to the treatment,the instability and failure process of dangerous rock mass is mainly manifested as shear slip failure from crack tip to footrill.After the prevention works,the safety factor of the dangerous rock slope is increased from 1.2 to 2.39.According to the monitoring data and creep numerical calculation,the overall deformation of the dangerous rock mass is small and in a stable state.The long-term stability evaluation method of highsteep perilous rock based on creep displacement under strength reduction is established.The long-term stability coefficient of the perilous rock bank slope after treatment is about 2.0,which is stabile and the treatment is successful.

关 键 词：三峡库区 高陡危岩 稳定性评价 强度折减法 

分 类 号：TU457[建筑科学—岩土工程]