工作面覆岩移动变形观测分析
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摘要
为了准确掌握工作面开采引起覆岩的变形情况,以Z11590工作面采后的覆岩变形为观测的对象,对顶底板移近量、顶底板间应力、覆岩的离层量和超前支撑压力进行观测。分析结果显示,随着工作面的远离,工作面后方的采空区顶板与充填体接触,由于所充填的似膏体起到了支撑作用,顶板下沉速率减缓,下沉量逐渐稳定,最大下沉值为0.376 m;采空区内竖向围岩应力在充填体的承压作用下增长缓慢,竖向应力最大值为8.7 MPa,采空区内充填物承载压应力为原岩应力的75%;顶板中水平离层裂隙的高度也得到了控制,最大高度为15mm;超前支承压力峰值距工作面2.0 m左右,影响范围约为14.4 m左右,最大峰值压力为24.6 MPa,支承压力系数为2.12。
In order to master the deformation of overlying strata in mining, overlying strata deformation of Z11590 working face was taken as observation, convergence between roof and floor, stress between top and bottom plates, overburden and lead support pressure of overlying strata were observed. The result shows that the filling paste made roof subsidence rate slow down, sinking rate gradually stable, maximum subsidence value 0.376 m, vertical surrounding rock stress grew slowly,with maximum value 8.7 MPa, filling load bearing pressure was 75 % of original rock stress, the height of the roof ionosphere fissure got control, with maximum height 15 mm, peak distance of advanced support pressure is 2.0 m, the influenced scope was about 14.4 m, maximum peak pressure is 24.6 MPa, bearing pressure coefficient 2.12.
In order to master the deformation of overlying strata in mining, overlying strata deformation of Z11590 working face was taken as observation, convergence between roof and floor, stress between top and bottom plates, overburden and lead support pressure of overlying strata were observed. The result shows that the filling paste made roof subsidence rate slow down, sinking rate gradually stable, maximum subsidence value 0.376 m, vertical surrounding rock stress grew slowly,with maximum value 8.7 MPa, filling load bearing pressure was 75 % of original rock stress, the height of the roof ionosphere fissure got control, with maximum height 15 mm, peak distance of advanced support pressure is 2.0 m, the influenced scope was about 14.4 m, maximum peak pressure is 24.6 MPa, bearing pressure coefficient 2.12.
引文
[1]陈敏.厚松散薄基岩煤层密实充填开采的覆岩移动破坏变形规律研究[D].淮南:安徽理工大学,2016.
[2]朱晓峻.带状充填开采岩层移动机理研究[D].徐州:中国矿业大学,2016.
[3]杨鹏飞.煤矿胶结充填开采覆岩移动及矿压显现规律研究[D].北京:中国矿业大学(北京),2016.
[4]朱时东.王河矿膏体充填开采覆岩移动变形及地表沉陷规律研究[D].焦作:河南理工大学,2015.
[5]王志波.膏体充填开采数值模拟分析与应用研究[D].邯郸:河北工程大学,2014.
[6]刘振伟.煤矿充填开采覆岩移动规律及地表沉降控制研究[D].邯郸:河北工程大学,2013.
[7]马文菁.矸石充填开采条件下岩层与地表移动变形规律研究[D].太原:太原理工大学,2013.
[8]冯锐敏.充填开采覆岩移动变形及矿压显现规律研究[D].北京:中国矿业大学(北京),2013.
[9]张德辉.煤矸石充填开采和覆岩控制理论及技术研究[D].阜新:辽宁工程技术大学,2013.
[10]王磊.固体密实充填开采岩层移动机理及变形预测研究[D].徐州:中国矿业大学,2012.
[2]朱晓峻.带状充填开采岩层移动机理研究[D].徐州:中国矿业大学,2016.
[3]杨鹏飞.煤矿胶结充填开采覆岩移动及矿压显现规律研究[D].北京:中国矿业大学(北京),2016.
[4]朱时东.王河矿膏体充填开采覆岩移动变形及地表沉陷规律研究[D].焦作:河南理工大学,2015.
[5]王志波.膏体充填开采数值模拟分析与应用研究[D].邯郸:河北工程大学,2014.
[6]刘振伟.煤矿充填开采覆岩移动规律及地表沉降控制研究[D].邯郸:河北工程大学,2013.
[7]马文菁.矸石充填开采条件下岩层与地表移动变形规律研究[D].太原:太原理工大学,2013.
[8]冯锐敏.充填开采覆岩移动变形及矿压显现规律研究[D].北京:中国矿业大学(北京),2013.
[9]张德辉.煤矸石充填开采和覆岩控制理论及技术研究[D].阜新:辽宁工程技术大学,2013.
[10]王磊.固体密实充填开采岩层移动机理及变形预测研究[D].徐州:中国矿业大学,2012.