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首页> 外文期刊>Tunnelling and underground space technology >Assessing the effects of rock mass gradual deterioration on the long-term stability of abandoned mine workings and the mechanisms of post-mining subsidence - A case study of Castle Fields mine
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Assessing the effects of rock mass gradual deterioration on the long-term stability of abandoned mine workings and the mechanisms of post-mining subsidence - A case study of Castle Fields mine

机译：评估岩体逐渐退化对废弃矿山开采长期稳定性的影响以及开采后沉陷的机理-以Castle Fields矿山为例

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Post-mining subsidence is a serious problem in urban areas constructed above abandoned mine workings. Subsidence may severely damage the environment and threaten the stability of surface structures and infrastructure. This study aims at analysing the role of gradual weakening of rocks on chimney collapse and sinkhole subsidence formation, in shallow mine workings. The factors leading to the degradation of the rock masses mechanical parameters are explained. The long-term stability of mine workings at Castle Fields mine, in West Midland, UK, is investigated as a case study. Progressive chimney collapse resulted in a large sinkhole in this area, and damaged the Dudley cricket ground, in 1987. The modified Tributary Area Method, TAM, is used to assess the effects of deterioration on the long-term loading of pillars. The long-term strength of pillars is also assessed based on empirical and theoretical approaches. Then, three-dimensional (3D) numerical modelling is used to assess the role of deterioration on the mechanisms of chimney failure and sinkhole development. A deteriorating model is proposed to incorporate the effects of gradual deterioration of rock mass mechanical parameters. Results of this study indicate that gradual deterioration due to weathering plays a significant role in the propagation of cavity and the formation of sinkholes above abandoned mine workings. Ignoring the gradual softening and the effects of deterioration, in the stability analysis of mine workings, may result in catastrophic consequences.
机译：在废弃矿山上方建造的城市地区，采后沉陷是一个严重的问题。沉降可能会严重破坏环境并威胁地面结构和基础设施的稳定性。这项研究旨在分析岩石的逐渐弱化在浅层煤矿作业中对烟囱坍塌和塌陷沉陷形成的作用。解释了导致岩体力学参数降低的因素。作为案例研究，研究了英国西米德兰郡的Castle Fields矿山的矿山作业的长期稳定性。渐进的烟囱倒塌导致该区域大坑陷，并在1987年损坏了达德利板球场。采用改良的支流面积法TAM来评估劣化对支柱长期荷载的影响。支柱的长期实力也根据经验和理论方法进行评估。然后，使用三维（3D）数值模型来评估劣化对烟囱衰竭和下沉孔发展机理的作用。提出了一种恶化模型，以考虑岩体力学参数逐渐恶化的影响。这项研究的结果表明，由于风化而导致的逐渐退化在废弃矿山上方空洞的传播和井眼的形成中起着重要作用。在矿山作业的稳定性分析中，忽略逐渐软化和恶化的影响可能会导致灾难性的后果。

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