长壁工作面推进对岩体应力应变状态的管理

IF 2.8 Q2 MINING & MINERAL PROCESSING Mining of Mineral Deposits Pub Date : 2022-09-30 DOI:10.33271/mining16.03.078
Iaroslav Shavarskyi, V. Falshtynskyi, R. Dychkovskyi, O. Akimov, D. Sala, V. Buketov
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引用次数: 12

摘要

目的是在确定直接顶板岩石的标准和临界沉降变化的基础上,研究长壁工作面推进对矿区附近地质力学状况的影响。方法。为了研究矿场附近的地质力学情况,作者应用了第聂伯罗理工大学开发的软件产品GeoDenamics Lite。该软件产品依赖于O.V.Savostianov教授对岩石应力-应变状态的计算程序。软件选择的便利性是基于对煤矿开采技术的支持控制和适应,以适应各向异性岩煤介质中影响技术参数的时间和空间变化的地球动力学应力场的变化。调查结果。指出了与长壁工作面推进的某些变化有关的基本问题。首次为东南部利沃夫希利亚的利索瓦矿在煤层开采条件下,通过配对长壁,制定了直接顶板岩石内切向应力的分析方案,这使得确定地层内标准载荷的物理和几何参数成为可能。独创性如果长壁长壁工作面前进速度为1.9至4.8米/天,则直接顶板岩层的下沉和水平位移的时间和空间变化的相关性已被定义为上部岩石组为5.2米,下部岩石组为3.9米。定义了基准压力的物理参数和几何参数,以及主顶板下沉过程中下部砂岩组的参数。分析了在直接顶板岩石临界下降时,额外压力对直接顶板岩石的影响。在这种情况下,除了顶板中的切向应力外,上覆地层的标准荷载还会导致长壁工作面上方的垂直裂缝导致岩石破坏。实际意义。已经开发了工程方法,从而可以确定长壁工作面推进对矿区附近地质力学状况的影响参数。未来,它将有助于预测长壁工作面周围参考压力的变化,同时防止动力支架的紧急沉降。
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Management of the longwall face advance on the stress-strain state of rock mass
Purpose is to study influence of a longwall face advance on the geomechanical situation in the neighbourhood of a mining site based upon determination of changes in standard and critical subsidence of the immediate roof rocks. Methods. To study a geomechanical situation in the neighbourhood of a mining site the authors have applied software product GeoDenamics Lite developed at Dnipro University of Technology. The software product relies upon a calculation procedure of stress-strain state of rocks by Professor O.V. Savostianov. Expediency of the software selection is based upon the supported control and adaptation of a coal mining technique to changes in geodynamic stress fields in the anisotropic rock-coal medium impacting temporal and spatial changes in the technological parameters. Findings. The basic problems have been singled out connected with certain changes in a longwall face advance. For the first time, an analytical scheme of tangential stresses within the immediate roof rocks has been developed for Lisova mine of SE Lvivvuhillia under the conditions of coal seam mining by means of the paired longwalls which makes it possible to determine both physical and geometrical parameters of standard loads within the formation. Originality. Dependencies of temporal and spatial changes in subsidences and horizontal displacements of rock layers of the immediate roof have been defined being 5.2 m for the upper rock pack and 3.9 m for the lower pack if the longwall longwall face advance is 1.9 up to 4.8 m/day. Both physical and geometrical parameters of the reference pressure have been defined as well as the parameters of lower sandstone pack in the process of the main roof subsidence. Impact of the extra pressure forces on the immediate roof rocks has been analyzed at the moment of critical lowerings of the immediate roof rocks. In this context, standard loading from the overlying formation in addition to tangential stresses in the roof result in rock failure due to vertical cracks above a longwall face. Practical implications. The engineering methods have been developed making it possible to identify impact parameters of a longwall face advance on the geomechanical situation in the neighbourhood of a mining site. In future, it will help forecast changes in the reference pressure around a longwall face while preventing emergency settlement of the powered support.
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来源期刊
Mining of Mineral Deposits
Mining of Mineral Deposits MINING & MINERAL PROCESSING-
CiteScore
5.20
自引率
15.80%
发文量
52
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