Flume tests and corresponding numerical simulation of hydraulic/mechanical behavior of Tangjiashan landslide dam subjected to seepage loading
Flume tests and corresponding numerical simulation of hydraulic/mechanical behavior of Tangjiashan landslide dam subjected to seepage loading
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渗流荷载作用下唐家山滑坡坝水力/力学特性水槽试验及数值模拟
DOI：
10.1016/j.sandf.2022.101200
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发表时间：
2022-10
影响因子：
3.7
通讯作者：
Zhang Feng
中科院分区：
文献类型：
--
作者：
Xiong Xi;Matsumoto Tatsunori;Shi Zhenming;Zhang Feng
滑坡坝通常由天然碎屑物质组成，在深度和径流方向上通常都存在不均匀的地层。此外，LDS的结构通常比原状地基更薄弱，更容易受到渗流荷载的影响。考虑到自然堆积LD材料的表层大多处于非饱和状态，研究渗流荷载作用下非均质地层LDS的水力/力学行为无疑是非常重要的。本文首先进行了一个系统的水槽试验程序，其中唐家山LD的模型设计被仔细地参考。在水槽试验中，考虑了三种不同的水位上升速率和两种不同的层位布置。然后进行土-水-气耦合有限元模拟水槽试验，并根据单元试验结果确定LD材料的各项材料参数。试验结果与计算结果的比较表明，本文提出的数值方法可以用来预测溃坝的发生和估算大坝失稳的风险。此外，LD材料的水力/力学行为和LD的非均质岩层对LD的稳定性是非常重要的。最后，从工程角度讨论了利用自然形成的LD而不是在其形成后将其破坏的可能性。
Landslide dams (LDs) are usually composed of natural debris materials and normally exhibit heterogeneous strata along both the depth and run-out directions. In addition, LDs usually have weaker structures than undisturbed ground and are more vulnerable to seepage loading. Considering that the surface layer of naturally packed LD materials is mostly in an unsaturated state, it is undoubtedly important to investigate the hydraulic/mechanical behavior of LDs with heterogeneous strata subjected to seepage loading. In this paper, a systematic flume test program was firstly conducted, in which the Tangjiashan LD was carefully referenced for its model design. Three different water level rising rates and two different stratal arrangements were considered in the flume tests. Then, soil-water-air coupled finite element analyses were conducted to simulate the flume tests, and all the material parameters of the LD materials were carefully determined based on the results of element tests. A comparison of the test and calculated results showed the possibility of using the proposed numerical method to predict the occurrence of dam breaching and to estimate the risk of LD failure. Moreover, the hydraulic/mechanical behavior of the LD materials and the heterogeneous strata of the LD were proven to be very important to the stability of the LD. Finally, from an engineering viewpoint, the possibility of utilizing a naturally formed LD, and not destroying it after its formation, is also discussed.
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影响因子：
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