综放工作面小煤柱动压巷道切顶卸压-锚注加固协同控制技术研究

Research on Collaborative Control Technology of Cutting Top Pressure Relief and Anchor Reinforcement of Small Coal Pillar Roadway on Comprehensive Discharge Face

针对多层坚硬顶板综放工作面留小煤柱巷道围岩变形破坏严重的问题,提出了动压巷道切顶卸压-锚注加固协同控制技术。以付家焉煤业10103运输巷为工程背景,通过矿压监测分析了多层坚硬顶板留小煤柱巷道的围岩变形规律,围岩变形经历3个阶段:微变形阶段(超前50 m)、缓慢变形阶段(+50~-125 m)、快速变形阶段(-125 m之后)。结合地质力学测试,揭示了小煤柱巷道的大变形机理主要有3个:留小煤柱巷道围岩力学强度较低、多层坚硬顶板结构失稳产生的大动载、巷道原有支护参数不合理等。基于此提出了切顶卸压-锚注加固协同控制技术,给出了关键参数,并进行了工业性试验,采用该技术后的顶底与两帮变形量分别减小了71.9%与72.4%。

In view of the serious deformation and damage of surrounding rock of roadway with small coal pillars in the fully mechanized top coal caving face with multi layer hard roof, a coordinated control technology of roof cutting and pressure relief and bolt grouting reinforcement for dynamic pressure roadway is proposed. Taking the 10103 haulage roadway of Fujiayan coal industry as the engineering background, the surrounding rock deformation law of the roadway with small coal pillars left in the multi-layer hard roof is analyzed through rock pressure monitoring. The surrounding rock deformation goes through three stages: micro deformation stage(50 m ahead), slow deformation stage(+50 to-125 m), and rapid deformation stage(-125 m behind). Combined with the geological and mechanical tests, three major deformation mechanisms of small coal pillar roadway are revealed: low mechanical strength of surrounding rock of small coal pillar roadway, large dynamic load caused by structural instability of multi-layer hard roof, unreasonable original support parameters of roadway, etc. Based on this, a collaborative control technology of top cutting and pressure relief anchor grouting reinforcement is proposed, and the key parameters are given. Industrial tests are carried out. The deformation of the top and bottom and the two sides are reduced by 71.9% and 72.4% respectively after using this technology.