刘园子煤矿膨胀性软岩支护技术
Supporting Technology of Expansive Soft Rock in Liuyuanzi Coal Mine
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摘要: 为了解决刘园子煤矿软岩巷道支护难题,减少巷道返修次数,采用围岩强度原位测试的方法,对巷道顶板和两帮的岩石强度进行了测试;通过制作试样实验室测试的方法,对巷道底板的岩石强度进行了测试;采用X射线衍射仪对底板岩石中黏土矿物成分的含量和膨胀性黏土矿物的含量进行了测试;掌握了巷道的力学参数和矿物成分,采用锚网锁喷和在围岩注射具有体积不收缩、不析水、流动性好、凝固时间快、抗压强度高的新型浆液的支护形式,对巷道进行了修复。通过9个多月的变形观测,巷道两帮最大移近量为10 mm,顶底板移近量为40 mm,满足了刮板输送机的安全运行要求。Abstract: To solve the difficult problem of soft rock tunnel support in Liuyuanzi Coal Mine and reduce the times of tunnel repairs, the rock strength of roof and two sides of the tunnel was tested by in-situ testing method. The content of clay minerals and expansive clay minerals in floor rocks were measured by X-ray diffractometer, the mechanical parameters and mineral compositions of tunnel were mastered. A new type of slurry with non-shrinkage, non-condensable water, good fluidity, fast solidification time and high compressive strength was injected into surrounding rocks, and anchor net spray and anchor rope is used to the repaired tunnel at the same time. Through more than 9 months of deformation observation, the maximum displacement of the two sides of the tunnel is 10 mm, and the displacement of the roof and floor is 40 mm, which meets the requirements of the safe operation of the belt tunnel.
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Keywords:
- expansive /
- soft rock support /
- strength test /
- lithology analysis /
- new grouting material
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