多期次河谷下切重力应力场分布特征研究  

Study on Distribution Characteristics of Incised Gravity Stress Field in Multi-stage Valley

作　　者：王浪 李子隆 白鹏[1] Wang Lang;Li Zilong;Bai Peng(Chengdu Institute of Survey and Mapping Investigation,Chengdu 610081,Sichuan)

机构地区：[1]成都市勘察测绘研究院,四川成都610081

出　　处：《陕西水利》2024年第10期37-39,43,共4页Shaanxi Water Resources

摘　　要：河谷下切的卸荷应力分布特征一直是水电工程关注的焦点之一。通过Geo-studio模拟多期次河谷下切后重力应力场的分布特征,分析认为河谷下切过程中仅距坡面一定深度范围内发生明显的应力重分布,主要表现为主应力方向的偏转和量值变化,而河谷及坡体深部主应力量值基本不随河谷下切过程而发生变化,河谷表层稍有卸荷现象,但程度很低。同时,软弱夹层的存在会使得夹层内岩体应力明显松弛,而在相邻硬岩中出现应力增高,但对远处岩体影响不大。The distribution characteristics of unloading stress in river valley undercutting have always been one of the focuses of hydropower engineering.The distribution characteristics of gravity stress field after multi-stage valley undercutting are simulated by Geo-studio.The analysis shows that the obvious stress redistribution occurs only in a certain depth range from the slope surface during the valley undercutting process,which is mainly manifested in the deflection and magnitude change of the main stress direction.The magnitude of the principal stress in the valley and the deep part of the slope does not change with the process of valley undercutting.There is a slight unloading phenomenon on the surface of the valley,but the degree is very low.At the same time,the existence of the weak interlayer will make the stress of the rock mass in the interlayer obviously relaxed,and the stress increases in the adjacent hard rock,but it has little effect on the distant rock mass.

关 键 词：河谷下切 应力场 卸荷 

分 类 号：P642[天文地球—工程地质学]