基于PFC3D的滑坡堰塞坝堆积过程与形态模拟

doi:10.16232/j.cnki.1001-4179.2020.04.022

摘要/Abstract

摘要： 基于PFC3D离散元软件，开展雅砻江唐古栋滑坡1967年失稳堆积堰塞坝的反演模拟，并基于反演参数对强变形A区失稳堆积进行预测模拟。结果表明：① 通过开展唐古栋滑坡1967年失稳堆积堰塞坝的反演分析，校核得到一组合理的细观力学参数；② 强变形A区失稳并整体下滑约1 600 m后在河谷堆积形成堰塞坝，堰塞坝形态呈中部高两边低的梯形形态分布，坝顶宽437.91 m，坝底宽994.39 m，坝高92.65 m；③ 堰塞坝在3种不同来流量下发生溃坝，其洪峰流量均远大于楞古水电站拟选坝址校核洪水流量。通过模拟发现，PFC3D软件对于模拟滑坡堰塞坝堆积过程及堆积形态有较好的适用性，可以获取堰塞坝堆积的三维形态和较准确的坝高。

关键词: 堰塞坝, PFC3D, 堆积形态, 溃坝洪水, 唐古栋滑坡

Abstract: Based on PFC3D discrete element, an inversion simulation on the Tanggudong landslide dam on Jinsha River in 1967 was carried out, and based on the inversed parameters we predicted the accumulation process of strong deformation zone A of the landslide dam. The following conclusions can be drawn. (1) By inversion analysis, we obtained a set of reasonable mesoscopic mechanical parameters. (2) The strong deformation zone A slid downward 1600m to the river valley, forming a barrier dam. The cross section of barrier dam was ladder shape, which was high at middle and low at both upstream and downstream side, the width of top, width of bottom and height of the dam was 437.9, 994.39, 92.65 m respectively. (3) Under three different inflows, the simulated peak flood of dam break were much larger than the check flood at the proposed dam site of Lenggu hydropower station. For simulation of barrier dam accumulation process and accumulation form, PFC3D has a good applicability in obtaining the three-dimensional shape and height of the dam.

Key words: barrier dam, PFC3D, accumulation form, dam break flood, Tanggudong landslide

吴建川,张世殊，吴爽，冉从彦. 基于PFC3D的滑坡堰塞坝堆积过程与形态模拟[J]. 人民长江, doi: 10.16232/j.cnki.1001-4179.2020.04.022.

WU Jianchuan, ZHANG Shishu, WU Shuang, RAN Congyan. Simulation on accumulation process and form of a barrier dam based on PFC3D[J]. , doi: 10.16232/j.cnki.1001-4179.2020.04.022.

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基于PFC3D的滑坡堰塞坝堆积过程与形态模拟

Simulation on accumulation process and form of a barrier dam based on PFC3D

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