受腐蚀劣化和地下采矿影响的斜坡变形和破坏特征的离散元分析:中国鸡尾山滑坡案例研究

IF 5.8 2区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Zhongping Yang, Qian Zhao, Shiqi Li, Yalong Zhao, Xinrong Liu, Zuliang Zhong
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引用次数: 0

摘要

本研究以中国重庆市武隆区的九微山滑坡为例,设计了一种数值模拟技术来研究两种环境后果:腐蚀恶化和地下采矿。通过强度折减模拟结构平面随时间变化的削弱特征,提出了结构平面腐蚀速率的剪切强度预测模型。应用离散元模拟方法,再现了在这两个因素作用下,危岩体移动和边坡失稳的完整过程,以阐明环境和工程效应对边坡变形行为的影响。结果表明,九围山滑坡的变形演化过程可分为两个阶段:长期腐蚀劣化引起的缓慢慢性变形和短期地下开采引起的较为严重的急性变形。因此,腐蚀劣化和地下开采作用下的覆土运动和断裂演化是一个渐进的演化过程,具有充分的时空连续性。腐蚀是一个长期的同步过程,会导致危险岩体周围的许多结构平面发生变化。相比之下,地下采矿通常是一个短期的触发因素,但却很容易造成危岩体不同部分运动特征的显著差异调整,从而导致危岩体运动在空间上的明显差异。此外,岩层平面的沉降变形特征主要取决于采矿所形成的岩层的空间位置和规模。分析相关倾斜岩层的应力特征有助于阐明山体空间结构适应性调整的控制机制。本案例的模拟结果还与离心机试验和物理模型试验结果进行了对比,验证了模拟方案的合理性,得出的结论为研究多因素耦合条件下滑坡发育过程和失稳机理提供了重要参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Discrete element analysis of deformation and failure characteristics in a slope affected by corrosion deterioration and underground mining: a case study of the Jiweishan landslide, China

Discrete element analysis of deformation and failure characteristics in a slope affected by corrosion deterioration and underground mining: a case study of the Jiweishan landslide, China

The present study uses the Jiweishan landslide in Wulong District, Chongqing City, China, as an example to design a numerical simulation technique to examine two environmental consequences: corrosion deterioration and underground mining. A shear strength prediction model for the corrosion rate of the structural plane was thus proposed by mimicking the time-dependent weakening characteristics of structural planes by using strength reduction. The discrete element simulation method was applied to reproduce the complete process of dangerous rock body movement and slope instability under the effects of these two factors to clarify the influence of environmental and engineering effects on slope deformation behaviour. This was intended to clarify the overburden movement process, fracture evolution law, and rock formation subsidence characteristics of karst mountains affected by mining from the perspective of geomechanics, and the results showed that the deformation evolution process of the Jiweishan landslide can be divided into two stages: the slow chronic deformation caused by long-term corrosion deterioration and the more severe acute deformation caused by short-term underground mining. The overburden movement and fracture evolution seen under corrosion deterioration and underground mining thus represent a progressive evolutionary process with full spatial and temporal continuity. Corrosion is a long-term synchronous process that creates the transformation of numerous structural planes around a dangerous rock body. Underground mining, in contrast, is typically a short-term trigger factor that can nevertheless easily cause significant differential adjustment of the movement characteristics of different parts of a dangerous rock body that result in distinct spatial differentiations of dangerous rock body movement. Further, the subsidence deformation characteristics of the rock formation plane mainly depend on the spatial position and scale of the goaf created by such mining. Analysing the stress characteristics of the relevant inclined rock strata helps clarify the control mechanism of a mountain’s spatial structure’s adaptive adjustment. The simulation results in this case were also compared with the results of centrifuge tests and physical model tests to verify the rationality of the simulation scheme, and the conclusions thus remove provide an important reference for the study of landslide development processes and instability mechanisms under multi-factor coupling conditions.

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来源期刊
Landslides
Landslides 地学-地球科学综合
CiteScore
13.60
自引率
14.90%
发文量
191
审稿时长
>12 weeks
期刊介绍: Landslides are gravitational mass movements of rock, debris or earth. They may occur in conjunction with other major natural disasters such as floods, earthquakes and volcanic eruptions. Expanding urbanization and changing land-use practices have increased the incidence of landslide disasters. Landslides as catastrophic events include human injury, loss of life and economic devastation and are studied as part of the fields of earth, water and engineering sciences. The aim of the journal Landslides is to be the common platform for the publication of integrated research on landslide processes, hazards, risk analysis, mitigation, and the protection of our cultural heritage and the environment. The journal publishes research papers, news of recent landslide events and information on the activities of the International Consortium on Landslides. - Landslide dynamics, mechanisms and processes - Landslide risk evaluation: hazard assessment, hazard mapping, and vulnerability assessment - Geological, Geotechnical, Hydrological and Geophysical modeling - Effects of meteorological, hydrological and global climatic change factors - Monitoring including remote sensing and other non-invasive systems - New technology, expert and intelligent systems - Application of GIS techniques - Rock slides, rock falls, debris flows, earth flows, and lateral spreads - Large-scale landslides, lahars and pyroclastic flows in volcanic zones - Marine and reservoir related landslides - Landslide related tsunamis and seiches - Landslide disasters in urban areas and along critical infrastructure - Landslides and natural resources - Land development and land-use practices - Landslide remedial measures / prevention works - Temporal and spatial prediction of landslides - Early warning and evacuation - Global landslide database
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