多次重复开采对围岩稳定及地表变形的影响
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摘要
以马城铁矿为工程背景,采用PHASE 2D有限元软件建立数值模型,研究多次重复开采影响下的覆岩移动规律及地表破坏范围。研究结果表明:开挖初期,矿体周围围岩最先进入屈服状态。开挖结束后,矿体左上方地表处呈现倒立的三角形塑性区且浅部矿体上方的位移破坏范围直通地表;矿体开挖后在地面形成一个盆地。随着开挖厚度的增大,地表下沉量也逐渐增大。由于矿体具有一定的倾角,且上、下采区同时开采,因此地表下沉曲线并不对称。
Based on the engineering background of Macheng Iron Mine,a numerical model was established by using PHASE 2D finite element software to study the movement law of overburden and the scope of surface damage under the influence of repeated mining.The results showed that the surrounding rock around the ore body entered the yielding state at the initial stage of excavation.After the excavation,the upper left surface of the ore body presented an inverted triangular plastic zone,and the displacement and damage area above the shallow ore body directly led to the surface.Moreover,a basin was formed on the ground after the excavation.With the increase of excavation thickness,the surface subsidence increased gradually.The surface subsidence curve was not symmetrical due to a certain dip angle of the ore body and the simultaneous excavation of the upper and lower mining areas.
Based on the engineering background of Macheng Iron Mine,a numerical model was established by using PHASE 2D finite element software to study the movement law of overburden and the scope of surface damage under the influence of repeated mining.The results showed that the surrounding rock around the ore body entered the yielding state at the initial stage of excavation.After the excavation,the upper left surface of the ore body presented an inverted triangular plastic zone,and the displacement and damage area above the shallow ore body directly led to the surface.Moreover,a basin was formed on the ground after the excavation.With the increase of excavation thickness,the surface subsidence increased gradually.The surface subsidence curve was not symmetrical due to a certain dip angle of the ore body and the simultaneous excavation of the upper and lower mining areas.
引文
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[3]张永刚,刘延欣,武宇亮.厚松散层薄基岩下重复采动覆岩破坏高度综合研究[J].煤炭技术,2017,36(8):72-75.
[4]宋利杰,张欣杰.煤层重复采动关键层失稳与地表移动规律研究[J].煤炭工程,2017,48(4):89-92.
[5]赵秋阳,谷海峰,康永华,等.近距离多层油页岩水体下重复开采覆岩破坏高度预计[J].煤矿开采,2015,20(1):78-81.
[6]孙世国,郭珮,董彦飞,等.巨厚煤层重复采动地表移动特点分析[J].煤矿安全,2016,47(1):188-191.
[7]王伟东,曲华,张培鹏,等.高位硬厚岩层下重复采动应力演化规律[J].煤炭技术,2015,34(2):22-24.
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