Study on the shear movement law of overlying strata by slice mining,Energy Science & Engineering

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Study on the shear movement law of overlying strata by slice mining
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-03-03 , DOI: 10.1002/ese3.668
Junhui Fu _{1,

2,

3} , Guangcai Wen _{1,

2} , Haitao Sun _{2,

3} , Xuelin Yang _{2,

3,

4}

Affiliation

Based on the analysis of shear movement characteristics of overlying strata under mining effect, a quantitative calculation model for shear displacement in the along‐strike and down‐dip directions of the overlying strata is established. The shear displacement at any point on the interface of overlying strata in composite rock beam under slice mining is analyzed. The evolution law of shear displacement and deformation of the overlying strata with the advancement of working face was inverted by physical simulation test. The results show that the shear movement of the overlying strata is characterized by a repeated pattern of "increase → decrease →increase → decrease.” The shear displacement of the overlying strata increases gradually after slice mining. The shear displacement of the overlying strata is in the shape of “W” after the lower seam mining, and the maximum shear displacement of the overlying strata by the lower seam mining is 1.67 times of that of the overlying strata after the upper seam mining. Field test of shear movement of the overlying strata was conducted on the panel 4308 of Chengzhuang coal mine. The results show that the shear displacement of the overlying strata above the coal seam increases with the burial depth. And the shear displacement of the overlying strata movement after mining has "time‐delay" effect. The larger the depth of the measuring point is, the larger value of the along‐strike shear displacement is. The breakage of the key strata of the overlying strata will cause the shear displacement of the overlying strata to increase rapidly. And there is a demarcation depth (127.98 m) for the shear displacement of the overlying strata. The shear movement of the overlying strata above the dividing point is not obvious, while the shear movement of the overlying strata below the dividing point is in the shape of "S" (amplitude of 50 mm). When the working face advanced beyond the test well, the overlying strata would experience multiple shear movement. When the working face advanced 34‐100 m ahead of the surface test well, the overlying strata experienced the most severe shear displacement. When the working face advanced to 74 m away from the surface test well, the shear displacement of the overlying strata between 10# (depth of 192.01 m) and 16# (depth of 300.07 m) is larger than that at the upper position, and down‐dip shear displacement is the most severe(about 315 mm). The shear displacement of the overlying strata is coincident with the along‐strike shear displacement, and the down‐dip shear displacement is smaller than the along‐strike shear displacement. This research provides theoretical guidance for the design of shale gas or coalbed methane surface wells and coal mine shaft under slice mining.

中文翻译：

层状开采上覆地层剪切运动规律研究

在分析采动作用下上覆地层剪切运动特征的基础上，建立了上覆地层沿走向和下倾方向剪切位移的定量计算模型。分析了层状开采条件下复合岩梁上覆层界面任意点的剪切位移。通过物理模拟试验，推算了随着工作面的推进，上覆地层的剪切位移和变形的演化规律。结果表明，上覆地层的剪切运动特征是“增加→减少→增加→减少”。薄片开采后，上覆地层的剪切位移逐渐增加。下煤层开采后，上覆地层的剪切位移为“ W”形，下煤层开采的上覆层的最大剪切位移为上煤层开采后的上覆层的最大剪切位移的1.67倍。在成庄煤矿4308面板上进行了上覆地层剪切运动的现场测试。结果表明，煤层上方覆岩层的剪切位移随埋深的增加而增大。开采后上覆地层运动的剪切位移具有“时间延迟”作用。测量点的深度越大，沿行程的剪切位移值越大。上覆地层关键地层的破裂将导致上覆地层的剪切位移迅速增加。上覆地层的剪切位移存在分界深度（127.98 m）。分割点上方的上覆地层的剪切运动不明显，而分割点以下的上覆地层的剪切运动为“ S”形（振幅为50 mm）。当工作面超出测试井时，上覆地层将经历多次剪切运动。当工作面比地面测试井提前34-100 m时，上覆地层经历了最严重的剪切位移。当工作面远离地面测试井前进至74 m时，上覆地层在10＃（深度为192.01 m）和16＃（深度为300.07 m）之间的剪切位移大于上部位置。下倾角剪切位移最严重（约315 mm）。上覆地层的剪切位移与沿走向的剪切位移一致，下倾剪切位移小于沿走向的剪切位移。该研究为片层开采下的页岩气或煤层气地面井及煤矿井筒的设计提供了理论指导。

更新日期：2020-03-03

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