The effects of magma intrusion on localized stress distribution and its implications for coal mine outburst hazards
The effects of magma intrusion on localized stress distribution and its implications for coal mine outburst hazards
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岩浆侵入对局部应力分布的影响及其对煤矿突出灾害的影响
DOI：
10.1016/j.enggeo.2017.01.002
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发表时间：
2017-02
影响因子：
7.4
通讯作者：
Mou Jun-hui
中科院分区：
文献类型：
--
作者：
Wang Liang;Liu Shimin;Cheng Yuan-Ping;Yin Guang-zhi;Guo Pin-kun;Mou Jun-hui
岩浆侵入煤层在世界各地都很常见。岩浆侵入引起的高温高压可改变煤的性质，包括煤级、力学性质、割理和孔隙结构以及吸附-解吸行为。由于岩浆侵入体的热性质也影响局部原位应力分布，因此煤岩性质的改变和应力分布的变化都能直接影响煤层瓦斯突出灾害。最近在中国淮北海孜煤矿的几次突出中观察到并证实了这一现象。本文综合前人的地质资料、室内实验和野外观测资料，对该岩浆侵入过程和机制进行了综合分析。结果表明，侵入岩床与地应力分布之间存在着内在的联系。这些资料表明，海子煤田的岩浆侵位起源于受岩浆底侵作用控制的壳幔型，后来幔源岩浆沿郯庐断裂带、肃北断裂带和大刘家断裂带依次沿着运移，最后以厚岩床的形式侵入煤田。通过对比煤层顶底板岩性以及关键煤层（3号和7号）之间的距离，发现进入5号煤层的岩浆侵入也与侵蚀作用有关。挤压过程中发生的侵入改变了原地应力分布在该地区，这沿着增加的厚度上覆岩床。因此，地应力的增加也导致了下伏煤层突出危险性的增加，这一结论得到了工作面钻屑量测量以及现场突出事件的验证。
Magma intrusions into coal seams are common throughout the world. The high temperatures and pressures induced by magma intrusion can alter the properties of coal, including its rank, mechanical properties, cleat and pore structures and adsorption-desorption behaviors. Because the thermal properties of magma intrusions also affect localizedin situstress distributions, both the alteration of coal properties and changes in stress distribution can directly influence coal seam gas outburst disasters. This phenomenon was recently observed and confirmed by several outbursts in the Haizi coal mines of Huaibei, China. In this paper, the processes and mechanisms of this magma intrusion are comprehensively analyzed based on an integrated data set including previously published geological data, in-house laboratory tests, and field observations. The results demonstrate that there is an intrinsic relationship between the intrusive sill and the subsequentin situstress distribution. These data suggest that the magma intrusion in the Haizi coalfield originated as a crust-mantle type controlled by magmatic underplating; later transported mantle-derived magma successively along the Tanlu Fracture Belt, the Subei Fault, and the Daliujia Fault; and finally intruded into the coalfield as a thick sill. By comparing the lithologies of the coal seam roof and floor, as well as the distances between key coal seams (No. 3 and No. 7), it was discovered that the magma intrusion that entered the No. 5 coal seam was also associated with erosional effects. The squeezing that occurred during this intrusion changed thein situstress distribution within the region, which increased along with the increasing thickness of the overlying sill. Therefore, the increasedin situstress also caused an increase in the outburst risk of the underlying coal seam, a conclusion that was verified by measuring the quantity of drilling cuttings on working faces as well as onsite outburst events.
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影响因子：
5.6
作者：
Connell, Luke D.;Lu, Meng;Pan, Zhejun
通讯作者：
Pan, Zhejun
DOI：
--
发表时间：
2011
期刊：
Coal Geology & Exploration
影响因子：
--
作者：
Zhang Qing
通讯作者：
Zhang Qing
影响因子：
2.9
作者：
Agust Gudmundsson
通讯作者：
Agust Gudmundsson
影响因子：
3.2
作者：
W. Fjeldskaar;H. M. Helset;H. Johansen;I. Grunnaleite;I. Horstad
通讯作者：
W. Fjeldskaar;H. M. Helset;H. Johansen;I. Grunnaleite;I. Horstad
DOI：
10.1144/sp374.5
发表时间：
2012-09
期刊：
--
影响因子：
--
作者：
Agust Gudmundsson;Ingrid Fjeldskaar Løtveit
通讯作者：
Agust Gudmundsson;Ingrid Fjeldskaar Løtveit