煤柱内大断面复合顶板巷道围岩控制技术
Roadway Surrounding Rock Control Technology for Composite Roof in Coal Pillar With Large Cross-section
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摘要: 为了研究顶板内软弱夹层对煤柱内大断面巷道围岩稳定性的影响及控制技术，针对昊锦塬煤矿复合顶板巷道围岩严重变形的问题，运用理论分析、数值计算并结合工程实践等方法，研究了顶板内软弱夹层对煤柱内大断面巷道围岩稳定性的影响。研究结果表明：当该矿巷道顶板软弱夹层厚度＜0.81 m时，巷道顶板极不稳定，易发生离层，须对顶板和两帮加强支护；运用ANSYS数值模拟及理论计算确定锚杆支护长度为2.6 m；加长锚杆长度使软弱夹层位于锚杆锚固区域内；增大锚杆直径，增强锚杆的抗拉、抗剪能力；加大锚杆预应力，使顶板及时恢复三向受力，能够有效的控制顶板的离层及两帮的变形。Abstract: In order to study the influence of soft rock strata in roof on the stability of roadway surrounding rock in coal pillar and its control technology, in view of the serious deformation problem of surrounding rock within the composite roof, we used the theoretical analysis and numerical calculation to study the influence of soft rock strata on the stability of surrounding rock with large cross-section roadway in coal pillar. Research results show that when the thickness of soft strata in roof is more than 0.81 m, the roof surrounding rock is extremely instable and prone to occur bed separation, which needs reinforcement support for the roof and two ribs; the ANSYS numerical simulation and theory is used to calculate the bolt length and the bolt length is 2.6 m. Extending the length of bolt makes soft strata to lie in the bolt anchoring area; the increasing bolt diameter is able to enhance the tensile and shear capacity of bolt; the increasing bolt pre-tensioned stress contributes to generating three-dimensional stress of roof. All these measures can control the roof bed separation and deformation of two ribs effectively.
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Keywords:
- composite roof /
- soft rock strata /
- ANSYS /
- roof separation /
- bolting support /
- surrounding rock control /
- roadway support
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