某水库边坡位移监测及稳定分析研究

Study on Slope Displacement Monitoring and Stability Analysis of Reservoir

通过在某大坝深部和表面设置位移监测点的方法,对其坡体的持续变形进行监测,继而分析水库边坡的变形机制。研究发现,边坡变形可以总结为“上部倾倒持续-深部张拉开裂-坝体与下部相协调”的变形机理;持续变形受边坡表部开挖卸荷、岩体结构、板岩软硬互层、自身砂岩的共同控制,属于一种常态化的变形调整;坡体深部位移大部分发生在煌斑岩脉、深拉裂缝以及f断层等区域,并且竖直方向上位移相差不大,主要以水平向变形为主;在开口线之下,开挖再支护边坡的表面监测点位移主要在水平向;当水库中水位持续升高,坡体受库水产生的浮力也就越大,坡体受浮力影响被迫抬起,使变形位移不再是沉降,而转变为抬升。

By setting displacement monitoring points at the deep part and surface of a dam, the continuous deformation of the slope was monitored, and then the deformation mechanism of the reservoir slope was analyzed. It is found that the deformation of the slope can be summarized as the deformation mechanism of “continuous upper dumping-deep tension cracking-coordination between the dam body and the lower part”;the continuous deformation is jointly controlled by the excavation and unloading of the slope surface, rock structure, slate soft and hard interlayer, and its own sandstone, which is Most of the deep displacement of slope body occurs in the area of brilliant vein, deep tension fracture and ffault, etc., and the difference of displacement in vertical direction is not big, mainly in horizontal direction;below the opening line, the displacement of surface monitoring point of excavated and re-supported slope is mainly in horizontal direction;when the water level in reservoir continues to rise, the slope body is forced to lift by the buoyancy force generated by reservoir water. The slope body is forced to lift by the buoyancy, so that the deformation displacement is no longer subsidence, but turns into lifting.