煤层开采影响下高压线塔移动变形规律研究

Study on the Movement and Deformation Pattern of High voltage Towers under the Influence of Coal Seam Mining

煤层开采将导致覆岩移动和地表变形,严重影响地表构筑物的安全稳定。为研究煤层开采对地面构筑物的影响,以赵庄二号井工作面开采为例,通过现场实测和理论分析方法对采空区上方高压线塔移动变形情况进行系统研究。基于概率积分法对高压线塔移动变形预测结果得出,位于采空区沉陷盆地中心的高压线塔受煤层开采影响较为严重,远离盆地中心影响则逐渐减小。高压线塔预测下沉值与现场实测值基本一致,由于地表不连续变形以及高压线塔特殊结构的特点,高压线塔受到地表倾斜变形影响出现基础受力不均匀,导致高压线塔倾斜变形加剧且与现场实测值相对较大。研究结果可为煤层开采导致地表构筑物变形防治提供科学指导和借鉴经验。

Coal seam mining will lead to overburden movement and surface deformation,which will seriously affect the safety and stability of surface structures.In order to study the impact of coal seam mining on surface structures,a systematic study of the movement and deformation of high-voltage line towers above the mining area was carried out by means of field measurements and theoretical analysis methods,taking the mining of Zhaozhuang No.2 well face as an example.The results show that the predicted deformation of high-voltage line towers based on the probability integral method shows that the high-voltage line towers located in the centre of the sunken basin of the mining area are more severely affected by the coal seam mining,while the influence decreases away from the centre of the basin.The predicted sinking value of the high-voltage line tower is basically the same as the measured value on site.Due to the discontinuous deformation of the ground and the special structure of the high-voltage line tower,the high-voltage line tower is affected by the tilting deformation of the ground and the uneven force on the foundation,resulting in the tilting deformation of the high-voltage line tower intensifies and is relatively larger than the measured value on site.The results of the study can provide scientific guidance and experience for the prevention and control of the deformation of surface structures caused by coal seam mining.