厚坚硬顶板来压规律与放顶研究

Research on Pressure Law and Roof Caving of Thick and Hard Roof

针对厚坚硬顶板来压步距较大和顶板难以垮落等问题,以袁店一矿1033中工作面为工程研究背景,通过理论分析、数值模拟和现场实测等相结合的方法,研究厚坚硬顶板岩层演化规律,该工作面顶板初次来压步距为50 m左右。为解决顶板悬顶带来的危害,提出水力压裂放顶方法,通过数值模拟放顶前、后的上覆岩层位移与应力的变化,验证该方法可行性。研究结果表明:水力压裂后支架阻力由32.50 MPa减少到24.32 MPa,降低约25.17%;顺槽顶板最大位移沉降量从140 mm减少到95 mm,减少约32.14%。

In view of the problems of large pressure step distance and difficulty in roof collapse of thick and hard roof and so on,the 1033 middle working face of Yuandian No.1 Mine is taken as the engineering research background.Through a combination method of theoretical analysis,numerical simulation,on-site actual measurement and others,the evolution law of thick and hard roof rock strata is studied.The initial pressure step distance of the roof of this working face is about 50 m.To solve the hazards caused by suspended roof,a hydraulic fracturing roof caving method is proposed.The feasibility of this method is verified by numerical simulation of the displacement and stress changes of the overlying rock stratum before and after roof caving.The research results show that after hydraulic fracturing,the support resistance decreases from 32.50 MPa to 24.32 MPa,a decrease of about 25.17%;The maximum displacement settlement amount of the roof of the crossheading decreases from 140 mm to 95 mm,a decrease of approximately 32.14%.