雅砻江两河口水电站左坝肩心墙边坡稳定性研究

两河口水电站左坝肩边坡岩性主要由三叠系砂岩、板岩组成,心墙边坡为陡倾横向坡。斜坡变形主要受NE向长大裂隙及NW向顺层断层控制,斜坡心墙部位发育的楔形拉裂体对工程边坡的稳定性起主要控制作用。本文采用FLAC3D软件对工程边坡应力场和位移场分布进行数值模拟。模拟结果表明,心墙边坡变形主要受特定结构控制,随着开挖的进行,边坡整体稳定性逐渐提高,但心墙开挖边坡存在不利块体。上游侧边坡为楔形拉裂破坏,下游侧边坡为滑移拉裂破坏,上述分析结果对心墙边坡的设计具有一定的指导意义。

THE STABILITY RESEARCH OF THE LEFT ABUTMENT SLOPE IN LIANGHEKOU HYDROELECTRIC POWER STATION OF THE YALONG RIVER

The slope lithology is mainly Triassic sandstone and slate in the left abutment of the Lianghekou Hydroelectric Power Station, and the core slope is steep-horizontal slope. The declivity deforming is mainly controlled by the long-big NE fractures and NW bedding fault. The declivity suited in the core develops the wedge-tensile block, which plays a major role in controlling the slope stability. This article adopts the FLAC3D software to simulate the distribution of the stress field and the displacement field. The simulation results show that the core slope deformation is mainly controlled by the specific structure. With the excavation, the slope stability in the whole gradually increases, but there are some adverse blocks in the excavation slope of the core. There is wedge-tensile fracturing in the upstream side of the slope, while there is slide-tensile fracturing in the downstream side of the slope. The results of the analysis above-mentioned are certain significance for the design of the core slope.