| 上覆硬厚岩层破断运动及断顶控制 |
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| 引用本文： | 蒋金泉,代进,王普,张林良.上覆硬厚岩层破断运动及断顶控制[J].岩土力学,2014,35(Z1):264-270. |
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| 作者姓名： | 蒋金泉 代进 王普 张林良 |
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| 作者单位： | 山东科技大学 矿山灾害预防控制省部共建国家重点实验室培育基地，山东 泰安 271002 |
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| 基金项目： | 国家自然科学基金资助(No.51374139)；山东省自然科学基金资助(No. ZR2013EER018)。 |
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| 摘 要： | 硬厚覆岩的破断与结构将发生显著的变化。针对汝箕沟煤矿二2煤层上覆厚层石英砂岩条件,采用现场实测、数值模拟、理论分析及现场试验等方法,研究了硬厚覆岩裂隙发育特征、破断运动、矿压显现特征及断顶控制技术,为硬厚覆岩工作面灾害防治提供了依据。研究表明,硬厚石英砂岩的微观结构致密完整,呈现大面积悬空、大步距破断运动,引起强烈的支架动载,甚至导致工作面风流逆转、沟通上部采空区隐形火区;硬厚岩层破断运移后产生明显的离层空间,并在开切眼上部和工作面上部及采空区中部形成覆岩主裂隙带,且发育高度大于经验计算数值,甚至与上方采空区沟通诱发灾害;实施开切眼深孔断顶爆破及降低工作面采高,有效缩短了硬厚岩层的初次破断步距,降低了支架动载及主裂隙带高度。
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| 关 键 词： | 硬厚岩层 破断运动 矿压显现 破断主裂隙带 开切眼断顶 |
| 收稿时间： | 2013-11-04 |
Overlying hard and thick strata breaking movement and broken-roof control |
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| JIANG Jin-quan
,
DAI Jin
,
WANG Pu
,
ZHANG Lin-liang.Overlying hard and thick strata breaking movement and broken-roof control[J].Rock and Soil Mechanics,2014,35(Z1):264-270. |
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| Authors: | JIANG Jin-quan DAI Jin WANG Pu ZHANG Lin-liang |
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| Institution: | State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and Ministry of Science and Technology, Shandong University of Science and Technology, Tai’an, Shandong 271002, China |
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| Abstract: | Great changes occur both in the breaking form and structure of hard and thick overlying strata. Aiming at conditions of coal seam II2 overburden thick quartz sandstone in Rujigou coal mine by using field measurement, numerical simulation, theoretical analysis, field tests and other methods, we studied the features of fractures development, the breaking movement of rock, characteristics of strata behaviors, and technology of broken roof control of the overlying hard and thick rock, providing a basis for disaster prevention of working face with hard and thick roof. Research results show that the microstructure of this kind of quartz sandstone is compactive and completion; a large area vacant and great breaking movement appeared in the strata, which cause the strong dynamic load of support, and even result in reversed air flow in working face, and link up invisible burning area at upper mined-out areas. Obvious separate strata space generated after the rupture of hard and thick strata, and main fracture zone form at the top of working face and the middle part of mined-out areas, the height of main fracture zone is greater than the experience value; and disasters can even be caused when the upper mined-out areas meet the fracture zone. By applying deep-hole blasting at open-off cut to break roof and lowering mining height, it effectively shortens the initial breaking span of hard, and thick strata, and reduce the dynamic load in support and the height of main fracture zone. |
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| Keywords: | hard and thick strata breaking movement strata behaviors breaking main fractures zone breaking roof by applying deep-hole blasting at open-off cut |
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