某堰塞湖边坡稳定数值模拟分析与处理措施

NUMERICAL SIMULATION ANALYSIS AND TREATMENT MEASURES FOR SLOPE STABILITY OF A DAMMED LAKE

为获得某堰塞湖高边坡的稳定性能,本文对其稳定性能进行了理论与数值模拟分析。采用材料力学法计算其稳定性,计算结果表明天然状况与暴雨工况下,高边坡稳定不满足规范要求。采用有限元法进行数值模拟分析,结果表明高陡边坡失稳破坏形式为崩塌,其形成主要受地质条件及暴雨等因素共同控制。在天然工况与暴雨工况下,边坡位移量分布基本保持一致;对于暴雨工况,在x=125m处剪切应力最为集中,数值也最大,此处潜在破坏带。最后提出对高边坡破碎带采用网喷混凝土和浅层锚杆锚固的治理措施,为同类工程提供参考借鉴。

In order to obtain the stability of a high slope of a barrier lake, the stability was analyzed theoretically and numerically. The stability of the material is calculated by means of material mechanics. The results show that the stability of high slopes does not meet the requirements under natural conditions and rainstorm conditions. The numerical simulation analysis was carried out by the finite element method. The result shows that the failure form of the high steep slope is collapse, and its formation is mainly controlled by the factors such as the geological conditions and the rainstorm. Under the natural condition and the heavy rain condition, the displacement distribution of the slope is basically consistent. For the heavy rain condition, the shear stress at x=125 m is the most concentrated, the value is the largest and the potential damage zone here. Finally, the control measures for the high slope fractured zone with net sprayed concrete and shallow bolt anchorage are put forward to provide reference for similar projects.