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西南某水电站坝址左岸发育一大型堆积体,方量约200×104m3。该堆积体沿SWW方向呈喇叭形展布,边界较为清楚,主要物质组成为碎(块)石土及碎石夹粉质粘土。目前堆积体上可见开挖造成的局部垮塌现象,其整体稳定性与否将对坝线选择及水库的安全运营造成严重影响。本文在对其基本特征及变形破坏模式深入调查研究的基础上,探讨了其成因机制和影响因素,为进一步评价该堆积体的稳定性提供了坚实基础。
On the left bank of a certain hydropower station in southwest China, a large-scale accumulation body is developed, with an area of about 200 × 104m3. The heap is flared along the direction of SWW, the boundary is clear, the main material composition of broken (block) stone and gravel folder silty clay. At present, the phenomenon of local collapse caused by excavation can be seen on the pile body, and its overall stability or not will seriously affect the dam line selection and the safe operation of the reservoir. Based on in-depth investigation of its basic features and deformation and failure modes, this paper explores its genesis mechanism and influencing factors, which provides a solid foundation for further evaluating the stability of this deposit.