地震作用下某水利枢纽左岸坝前堆积体稳定性预测分析

发布时间：2018-04-16 11:23

本文选题：堆积体稳定性预测 + 地震作用　；参考：《长江科学院院报》2017年06期

【摘要】：某水利枢纽工程左岸坝前堆积体经历了5·12汶川大地震及4·20雅安地震,其内部的物理力学参数发生了恶化,稳定性有所降低。尽管现在该堆积体整体是稳定的,一旦再次经历类似的地震,其整体稳定状况会更加恶化,将对下游水利枢纽工程的安全稳定运行产生重大影响。运用FLAC~(3D)数值模拟方法和Newmark法计算堆积体边坡在地震作用下的永久位移是很有必要的。计算结果表明:地震作用下堆积体发生位移部位主要位于压重体上方的小部分范围,产生的最大位移为0.56 m,同时根据位移和塑性区情况判断了堆积体的稳定性。最终预测出在类似的地震作用下,堆积体只会发生局部的浅表层蠕滑,整体仍是稳定的,研究成果为保证下游水利枢纽的安全稳定运行提供依据。
[Abstract]:The accumulation body in front of the dam on the left bank of a water conservancy project has experienced 512 Wenchuan earthquake and 420 Ya'an earthquake. The physical and mechanical parameters of the reservoir have deteriorated and the stability has been reduced.Although the whole body is stable now, once the similar earthquake is experienced again, the overall stability will deteriorate, which will have a significant impact on the safe and stable operation of the downstream hydro project.It is necessary to calculate the permanent displacement of accumulative slope under seismic action by using the numerical simulation method and Newmark method.The calculated results show that the displacement position of the accumulative body is mainly located in a small area above the gravity body under earthquake action, and the maximum displacement is 0.56 m. The stability of the accumulated body is judged according to the displacement and plastic zone at the same time.Finally, it is predicted that under the similar earthquake action, only local shallow surface creep will occur, and the whole body will still be stable. The research results provide the basis for ensuring the safe and stable operation of downstream water conservancy projects.
【作者单位】：四川大学水利水电学院;成都理工大学地质灾害防治与地质环境保护国家重点实验室;
【基金】：地质灾害防治与地质环境保护国家重点实验室开放基金项目(SKLGP2012K015)
【分类号】：TV223

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