Analysis of the runout distance and impact force of an actual landslide considering the effect of single rigid barrier using an SPH approach

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Weijie Zhang, Yongqi Xue, Xin Wang, Shuxin Chen, Jian Ji, Yufeng Gao
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Abstract

Many studies have explored the impact mechanism of debris flow on barriers via small-scale and large-scale flume tests, but little attention has been given to actual landslides. In this study, an SPH model was constructed to simultaneously model an actual landslide and a rigid barrier via a numerical approach. Thereafter, the applicability of the proposed model was validated through simulations of the Gaoloucun landslide and tests of granular material impacting rigid walls. Finally, several simulation cases were designed for the Gaoloucun landslide by changing the location and height of a single rigid barrier. These cases were designed to obtain the runout distance and impact force. The simulation results indicate that the runout distance slightly decreases when the barrier is near the source area, and the reduction in impact is more obvious when the barrier is in the flow and deposition areas. The peak impact forces derived from the numerical simulations correspond with the analytical solutions, and the force value increases as the barrier location approaches the source and the height increases. Thus, a moderately tall barrier in the flow area of the Gaoloucun landslide could constitute the optimal configuration scheme.

Abstract Image

用SPH方法分析考虑单一刚性屏障影响的实际滑坡跳动距离和冲击力
许多研究通过小型和大型水槽试验探讨了泥石流对障碍物的冲击机理,但对实际滑坡的关注较少。在本研究中,建立了一个SPH模型,通过数值方法同时模拟实际滑坡和刚性屏障。随后,通过高楼村滑坡模拟和颗粒物料冲击刚性墙体试验,验证了所提模型的适用性。最后,通过改变单一刚性屏障的位置和高度,设计了高楼村滑坡的多个模拟案例。设计了这些案例,以获得跳动距离和冲击力。模拟结果表明,当障碍物靠近源区时,跳动距离略有减小,当障碍物位于流动和沉积区时,冲击减小更为明显。数值模拟得到的峰值撞击力与解析解相吻合,且撞击力值随着障碍物位置靠近源和高度的增加而增大。因此,在高楼村滑坡流区设置中等高度的屏障可构成最优配置方案。
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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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