Impact of longwall mining on slope stability – A case study

IF 0.7 Q4 MECHANICS

Studia Geotechnica et Mechanica Pub Date : 2022-11-27 DOI:10.2478/sgem-2022-0019

P. M. V. Nguyen

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Abstract

Abstract In recent decades, many open pit (OP) mines have either already made the decision or are at the planning stage to change their mining activity from OP to underground (UG) to remain competitive. Technically, before the OP ends its operation, both OP and UG mining will have to be operated simultaneously for a certain period of time. It is well known that UG operation causes subsidence, discontinuous deformations, and changes in hydrogeological conditions. In case of UG operation located below the OP mine, slope deformation can be expected as a result of subsidence induced by UG exploitation. This paper presents a numerical analysis of slope stability under the influence of the longwall mining operation at the Cao Son OP mine in Vietnam. All calculation variants were performed using the Finite Difference Method code, FLAC. In order to evaluate slope stability of the OP slope, various geometry configurations showing advances of both OP and UG extractions were examined. Based on the outcomes, assessments on OP slope are presented, and then, practical actions regarding the location and direction of UG extraction are recommended, with an aim to minimize the impact of underground mining on OP slope.

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长壁开采对边坡稳定性的影响——一个案例研究

摘要近几十年来，许多露天矿要么已经做出决定，要么正处于计划阶段，将其采矿活动从露天改为地下，以保持竞争力。从技术上讲，在OP结束运营之前，OP和UG采矿必须同时运营一段时间。众所周知，UG操作会导致沉降、不连续变形和水文地质条件的变化。在位于OP矿山下方的UG作业的情况下，由于UG开采引起的沉降，预计会导致边坡变形。本文对越南Cao Son OP矿在长壁开采作业影响下的边坡稳定性进行了数值分析。所有计算变体均使用有限差分法代码FLAC进行。为了评估OP边坡的稳定性，研究了显示OP和UG提取进展的各种几何构型。在此基础上，对OP边坡进行了评估，并就UG开采的位置和方向提出了建议，以最大限度地减少地下开采对OP边坡的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Studia Geotechnica et Mechanica MECHANICS-

CiteScore

1.30

自引率

16.70%

发文量

审稿时长

16 weeks

期刊介绍： An international journal ‘Studia Geotechnica et Mechanica’ covers new developments in the broad areas of geomechanics as well as structural mechanics. The journal welcomes contributions dealing with original theoretical, numerical as well as experimental work. The following topics are of special interest: Constitutive relations for geomaterials (soils, rocks, concrete, etc.) Modeling of mechanical behaviour of heterogeneous materials at different scales Analysis of coupled thermo-hydro-chemo-mechanical problems Modeling of instabilities and localized deformation Experimental investigations of material properties at different scales Numerical algorithms: formulation and performance Application of numerical techniques to analysis of problems involving foundations, underground structures, slopes and embankment Risk and reliability analysis Analysis of concrete and masonry structures Modeling of case histories