Stability evaluation method for hyperbolic coal pillars under the coupling effects of high temperature and ground stress
Stability evaluation method for hyperbolic coal pillars under the coupling effects of high temperature and ground stress
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DOI：
10.1007/s12665-017-7048-0
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发表时间：
2017-10
影响因子：
2.8
通讯作者：
Huaizhan Li;G. Guo;Jianfeng Zha;Yanqing He;Zhiyong Wang;S. Qin
中科院分区：
文献类型：
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作者：
Huaizhan Li;G. Guo;Jianfeng Zha;Yanqing He;Zhiyong Wang;S. Qin
研究了采用条带开采工作面采矿气化炉控制回喷技术（SMFM）的煤炭地下气化技术。这种绿色采矿方法与传统的条带采矿相比具有几个优点，但SMFM操作的应力分布和稳定性在很大程度上尚未经过测试。特别是，双曲线炼焦煤柱用于SMFM相比，在传统的条带开采中使用的矩形煤柱，这可能会影响极限承载力和稳定性。采用数值模拟的方法研究了高温耦合作用下，不同因素（拱高、柱高和柱宽、力学特性）对双曲柱极限承载力的影响。研究结果表明，拱高对煤柱应力影响较大，而煤柱宽度和高度的变化影响较小。提出了一种稳定性评价方法，并以内蒙古自治区为例进行了验证。本文的理论研究结果对SMFM的推广和应用具有实际意义。
We studied an underground coal gasification technique using strip mining-face mining gasifier controlled retraction injection technology (SMFM). This green mining approach offers several advantages over conventional strip mining but the stress distribution and stability of SMFM operations remain largely untested. In particular, hyperbolic coking pillars are used in SMFM compared with rectangular pillars used in traditional strip mining, which can influence the ultimate bearing capacity and stability. We use numerical simulations to investigate the influence of different factors (arch height, pillar height and width, mechanical characteristics), under the coupling effect of high temperature, on the ultimate bearing capacity of hyperbolic pillars. Our results indicate that arch height has a strong influence on pillar stress, while changes in pillar width and height are less significant. A stability evaluation method is proposed and tested on a case study in Inner Mongolia. Our theoretical results have practical significance for the promotion and application of SMFM.