长河坝水电站河谷应力场特征三维数值模拟研究

3D NUMERICAL SIMULATION FOR THE VALLEY'S STRESS FIELD AT CHANGHEBA HYDROPOWER STATION

根据水压致裂法及孔径变形法的应力实测成果,采用三维有限元分析方法模拟河谷形成的下切过程。结果表明,最大主应力在河谷谷底部位较为集中,其迹线在坡面附近发生明显偏转;断层造成地应力局部分区和局部地应力集中,但未改变应力场的整体分布规律。研究成果对认识深切河谷区斜坡应力场特征具有重要意义。

The 3-D Finite Element Analysis is used to simulate the formation process of the incised valley, based on the field survey of geo-stress conducted by hydraulic fracturing method and aperture deformation method. The results show that the maximum principal stress is concentrated at the valley floor and it obviously deflects near the slope; the faults generate local partition and concentration of geo-stress, but no change in the overall distribution of the stress field. This research can shed light on the study of slope geo-stress of deep valleys.