摘要
拟建的锦屏水电站所在地区工程地质条件复杂 ,重力作用下的高陡边坡应力场变化问题是主要的工程地质问题之一。采用三维有限元数值模拟的方法对雅砻江七级河谷阶地形成过程中应力场的变化和现今河谷阶段的三维应力场进行研究 ,为近坝库岸稳定性研究提供依据。通过计算得出 :随着河谷下切 ,地应力逐步释放 ,且每一阶段的河谷底部始终是σx 应力集中区 ;主应力的分布具有分带性 ;拉应力的位置受断层、地形等因素的影响 ;
Conditions of engineering geology are complex on the zone of t he proposed Jinping hydropower station, the transformation stress field of high steep slopes under gravitational effect is one of the main engineering geologica l problems. In this paper, with the help of three dimension finite element numer ical simulation method, the change of 3-D stress field in the course of current valley with seven terraces is studied by the 3-D numerical model of FEM, which c an provide a basis for the stability research of the reservoir bank. According t o the results of numerical simulation, we found some conclusion that the local s tress of the slope was gradually released along with valley cutting of Yalongjia ng, the concentration zone of stress ( σ x ) is always in the bottom of the valley at each stage, the distribution of primary stress is depend on the ch aracter of zone, the location of tensile stress is affected by the factors of fa ultage and terrain etc, and the value of maximal primary stress is comparatively great in the rock mass.
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2003年第2期208-212,共5页
Journal of Jilin University：Earth Science Edition
基金
国家自然科学基金资助项目 (40 2 72 117)
