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针对某水电站导流洞进口边坡开挖过程中出现的顺层面张裂缝问题,采用工程地质分析、数值模拟相结合的方法,定性、定量分析裂缝产生机理及开挖边坡稳定性。研究结果表明,进口边坡本质上是一个“下软上硬”的二元结构,作为边坡基座的Pt2-12y具有极薄层的岩体结构特征,开挖卸荷后呈现了较强的弯曲式倾倒变形;边坡潜在失稳区域集中在前缘Pt2-12y岩层内,其变形破坏模式由倾倒-拉裂为主转变为滑移-拉裂;从安全系数计算结果及倾倒变形体的一般破坏特征来看,当前条件下开挖边坡整体稳定是有保障的。
Aiming at the problem of facing cracks in the excavation of the inlet slope of diversion tunnel of a hydropower station, the mechanism of fracture generation and the stability of the excavation slope are qualitatively and quantitatively analyzed by means of engineering geological analysis and numerical simulation. The results show that the imported slope is essentially a binary structure of soft upper hard rock. As a basement of the slope, Pt2-12y has an extremely thin layer of rock mass structural features. After excavation unloading And the potential bending instability zone of the slope is concentrated in the frontal Pt2-12y rock formation. The deformation and failure mode of the slope is mainly changed from pouring-breaking to sliding-cracking. From the calculation of the safety factor and dumping Deformation of the general damage characteristics of view, under the current conditions of the overall stability of excavation slope is guaranteed.