地质异常带巷道稳定控制对策及效果研究

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摘要从地质异常带工程地质条件出发，进行石门揭煤的突出危险性评价及进一步防治，确保所揭11–2煤层没有突出危险性。提出超长孔钻杆注浆与钻杆埋入钻孔相结合的新型超前支护技术，并对其作用机制及支护工艺分别进行分析和介绍；开挖实践表明：新型预支护手段为巷道开挖和后续支护创造了理想的施工环境。初步支护后巷道变形监测及分析表明：在同一监测断面上，底臌变形最为严重，帮、顶收敛变形次之；在不同监测断面上，巷道围岩破碎程度越严重，巷道变形越显著。巷道变形破坏原因分析表明：除围岩自身工程地质条件及地应力对巷道变形有重要影响外，关键取决于巷道本身的施工控制条件，其中底板弱支护是导致巷道严重底臌，进而造成全断面失稳破坏的根本诱因。之后，提出新型预应力组合锚注底臌治理技术，并对其加固机制及施工工艺分别进行分析和介绍。底臌治理前后表面位移及深部位移监测结果的对比分析表明：新技术对巷道底臌治理效果显著，巷道围岩表面及深部变形速率显著降低，围岩整体稳定已基本得到控制。

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关键词 ：采矿工程, 断层破碎带, 瓦斯突出危险性, 超前支护, 分步联合支护, 底臌治理, 效果分析

Abstract：Based on the engineering geological conditions in geological anomaly zone，outburst hazard of coal uncovering in rock cross-cut is evaluated and prevented further；and it is confirmed that the coal seam 11–2 has no outburst danger. Combining the grouting in super deep hole and pipe embedded in the drilling，a new advanced supporting technique is proposed；and its action mechanism and supporting technology are analyzed and introduced respectively. Excavation practice has shown that the new advanced support means are feasible to provide an ideal construction circumstances for excavation and subsequent support. After the preliminary support，the deformation monitoring and analysis of roadway show that at the same monitoring section，the deformation of floor heave is more serious than that of two sides and roof；and at different monitoring sections，the deformation of roadway becomes more significant with the increasing of crushing degree of roadway surrounding rock. Cause analysis of the deformation and damage of roadway shows that except engineering geological conditions and in-situ stress of surrounding rock have a significant effect on roadway deformation，another key factor depends on the construction control condition of roadway. Floor short supporting is essential inducement to cause floor heaving seriously，and then instability and failure of whole section ultimately. Then，a new supporting technique combined prestressed multiple anchor cable and bolt-grouting for control of floor heave is proposed；and its reinforcement mechanism and construction technology are analyzed and introduced respectively. Contrast analysis of monitoring results before and after control of floor heave on surface displacement and deep displacement have shown that effect of the new technique is significant for control of roadway floor heave；and rates of surface deformation and deep deformation of roadway significantly decrease，so that the overall stability of surrounding rock of roadway is basically controlled.

Key words： mining engineering fault fracture zone gas outburst hazard advanced support stepped combined support control of floor heave effect analysis

收稿日期: 2011-05-17

引用本文:

刘恺德1，刘泉声1，刘滨1，龚光庆2. 地质异常带巷道稳定控制对策及效果研究[J]. 岩石力学与工程学报, 2011, 30(12): 2486-2497.
LIU Kaide1，LIU Quansheng1，LIU Bin1，GONG Guangqing2. RESEARCH ON CONTROL MEASURES AND EFFECTS FOR ROADWAY STABILITY IN GEOLOGICAL ANOMALY ZONE. , 2011, 30(12): 2486-2497.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/I12/2486

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