杜岩, 张洪达, 谢谟文, 蒋宇静, 贾北凝. 矿山采空区边坡动态稳定性评价方法研究[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2024.05.30.002
引用本文: 杜岩, 张洪达, 谢谟文, 蒋宇静, 贾北凝. 矿山采空区边坡动态稳定性评价方法研究[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2024.05.30.002
Study on dynamic stability evaluation method of mine goaf slope[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2024.05.30.002
Citation: Study on dynamic stability evaluation method of mine goaf slope[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2024.05.30.002

矿山采空区边坡动态稳定性评价方法研究

Study on dynamic stability evaluation method of mine goaf slope

  • 摘要: 矿山边坡因采空区沉降引发的斜面岩土体崩塌破坏,是一种破坏力极强的地质灾害。由于传统的稳定性评价方法未考虑采空区沉降造成的应力场变异,难以实现矿山边坡的动态稳定性评价,因而在矿山地质灾害预警预防方面存在诸多限制。基于此,本研究通过引入采空区边坡沉降分析模型,对传统不平衡推力法进行修正,建立一套适用于矿山边坡的动态稳定性评价方法。工程案例对比研究得出,新方法得出的鸡尾山滑坡稳定性系数为0.979,而传统方法计算结果为1.355。新方法由于考虑了采空区沉降作用与锁固段的破坏情况,更能反应矿山采空区边坡的实际情况。当沉降位移比(SHDR)大于0.73时,采空区滑坡稳定性会发生明显变异,因而会在相对安全的工况下发生失稳破坏。本研究为我国的矿山采空区边坡的稳定性评价提供了新的技术支持,也为矿山更好应对类似地质灾害提供了有效参考。

     

    Abstract: Landslides in mined out areas, caused by underground mining, result in subsidence of the overlying rock mass and collapse, which is a highly destructive geological hazard. Traditional stability assessment methods overlook the stress field variations induced by goaf settlement, making it challenging to evaluate the stability of mine slopes, thereby limiting geological disaster warning and prevention measures. To address this issue, this study introduces a model for analyzing goaf slope settlements and revises the traditional unbalanced thrust method to establish a dynamic stability assessment method tailored for mine slopes. Engineering case studies reveal that the stability coefficient for the Jiweishan landslide, determined using the new method, is 0.979, compared to 1.355 using the traditional approach. By accounting for goaf settlement and the failure of locking sections, the new method more accurately reflects the actual conditions of mine goaf slopes. When the settlement-horizontal displacement ratio (SHDR) exceeds 0.73, significant changes in the landslide's stability occur within the goaf, leading to instability under apparently stable conditions. This research offers new technical support for evaluating the stability of mine goaf slopes in China and offers an effective reference for mines to better manage similar geological disasters.

     

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