Investigation on support pattern of a coal mine roadway within soft rocks - a case study
Investigation on support pattern of a coal mine roadway within soft rocks - a case study
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软岩煤矿巷道支护模式研究——实例研究
DOI：
10.1016/j.coal.2015.01.003
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发表时间：
2015-02-15
影响因子：
5.6
通讯作者：
Fan, M. J.
中科院分区：
文献类型：
--
作者：
Kang, H. P.;Lin, J.;Fan, M. J.
软岩巷道支护是煤矿开采实践中的一个典型难题。锚杆支护作为应用最广泛的支护结构，已成功地应用于各种复杂地质岩土条件下的煤矿巷道支护，包括极软弱岩体巷道、地下千米巷道、大断面切眼巷道、薄煤柱甚至无煤柱采空区边缘沿着巷道等。然而，岩石锚杆系统加固软岩的有效性和适用性尚未建立。在本文中，我们提出了一个案例研究的岩石锚杆系统用于加固长壁巷道在软岩体。研究地点是中国平庄矿区红庙煤矿5-2S长壁采区的尾巷，该矿区是该地区典型的软岩煤矿。由于传统的岩石锚杆系统未能保持尾门的稳定性，岩石锚杆系统在此应用中的有效性仍然值得怀疑。首先研究了岩石锚杆系统失效的原因。为了更好地理解锚杆支护软岩的机理，进行了离散单元法模拟。最后提出了一种改进的岩石锚杆系统，用于支持后挡板。现场监测表明，改进后的锚杆系统成功地抑制了尾门的开裂和膨胀。该实例研究有助于加强锚杆支护在软岩巷道中的工程应用。(C)2015 Elsevier B. V.版权所有。
Supporting coal mine roadway within soft rocks is a typical challenge in underground mining practices. As the most widely used support structure, rock bolt system has been successfully used to support coal mine roadways in various complex geological and geotechnical conditions, including roadway in extremely weak rock masses, roadways 1000 m below ground, open-off cut roadways with large section, and roadways along the edges of mined-out areas with thin pillars or even no pillars. However, the effectiveness and applicability of rock bolt system for the reinforcement of soft rock masses has not yet been established. In this paper, we present a case study of rock bolt system as used for ground reinforcement of longwall entries within soft rock masses. The study site was the tailgate of the longwall panel 5-2S at the Hongmiao coal mine in the Pingzhuang coal-mining district in China, a typical soft rock coal mine of the region. Since traditional rock bolt system failed to maintain the stability of the tailgate, the effectiveness of rock bolt systems for this application remained doubtful. The reasons for the failure of the rock bolt system were first examined. A discrete,element method simulation was then performed to better understand the mechanism of rock bolts in supporting soft rocks. An improved rock bolt system was finally proposed that was used to support the tailgate. The field monitor showed that the improved rock bolt system successfully suppressed cracking and dilation of the tailgate. This case study is useful in enhancing engineering applications of rock bolts to support longwall entries excavated in soft rock masses. (C) 2015 Elsevier B.V. All rights reserved.