摘要
目前关于倾斜煤层开采引起的地表移动变形计算一般是将倾斜煤层开采等价为2个水平煤层的半无限叠加或者将倾斜煤层进行水平划分的方法,计算过程存在简化。为了克服倾斜煤层开采由于计算简化带来的误差,根据计算地表点与倾斜煤层的相对位置关系,利用开采影响传播角进行等价水平煤层转换,将倾斜煤层的移动变形计算转化为水平煤层计算,提出倾斜煤层开采地表移动变形等价计算方法,并将等价计算结果与半无限叠加开采、水平划分计算结果进行对比,分析了半无限叠加和水平划分简化计算误差产生的原因。研究结果表明:①等价计算结果与半无限开采叠加下沉量计算结果基本相同,半无限开采叠加计算存在变形计算误差表现为上、下山边界两侧拉伸与压缩变形值相同,未能充分体现变形与开采深度的密切关系;②由于煤层倾角和开采影响传播角的影响,水平划分方法下沉量、水平变形计算误差较大,煤层倾角越大误差越大,这一误差不会因水平煤层划分个数的增加而消除;③采用等价计算方法能够消除概率积分法对倾斜煤层开采地表移动变形计算的简化误差,实现计算结果与理论的完美契合。研究结果丰富了开采沉陷预计体系,对提高倾斜煤层开采地表移动变形计算精度具有一定意义。
At present,the calculation of surface movement and deformation caused by inclined coal seam mining is generally equivalent to the semi-infinite superposition of two horizontal coal seams or the horizontal division of inclined coal seams.The calculation process is too simplified.In order to overcome the error caused by the simplified calculation of the inclined coal seam mining,this author put forward the calculation of the relative position relationship between the surface point and the inclined coal seam to convert the equivalent horizontal coal seam using the mining influence angle,and converts the calculation of the movement deformation of the inclined coal seam into the horizontal coal seam calculation.An equivalent calculation method for surface movement deformation in inclined coal seam mining was proposed,and the equivalent calculation results with the calculation results of semi-infinite superposition mining and horizontal division were compared,and the reasons for the calculation errors of semi-infinite superposition and horizontal division simplified calculation were analyzed.The research results show that:①The equivalent calculation result is basically the same as the calculation result of the semi-infinite mining superimposed subsidence value.The error in the deformation calculation is manifested in the semi-infinite mining superimposed calculation of the same tensile and compression deformation values on both sides of the upper and lower boundaries,failing to fully reflect the close relationship between deformation and mining depth;②Due to the influence of the coal seam dip and the propagation angle of mining influence,the calculation error of the subsidence value and horizontal deformation value of the horizontal division method is larger.The larger the coal seam dip,the greater the error.This error will not be eliminated due to the increase in the number of horizontal coal seams;③The equivalent calculation method can eliminate the simplified error of the probability integral method in the cal
作者
张华兴
ZHANG Huaxing(CCTEG Coal Mining Research Institute,Beijing 100013;Mining Damage Technical Appraisal Committee,China Coal Society,Beijing 100013)
出处
《煤炭科学技术》
CAS
CSCD
北大核心
2020年第10期119-123,共5页
Coal Science and Technology
基金
国家自然科学基金资助项目(51604151)。
关键词
开采沉陷
倾斜煤层
移动变形
等价计算
误差分析
mining subsidence
inclined coal seam
movement and deformation
equivalent calculation
error analysis
