摘要
为分析回采巷道侧向支承压力对于工作面前方支承压力峰值和塑性区宽度的影响,在地基梁模型的基础上引入巷道侧向支承压力的应力集中系数k,推导出考虑了巷道侧向支承压力的顶板位移曲线,通过该曲线可计算工作面前方矿体的支承压力以及塑性区宽度。通过相应的工程实例进行试算,结果表明:在计算工作面前方的塑性区宽度和支承压力峰值时,若不考虑回采巷道侧向支承压力的影响,会导致计算结果偏低,其结果不符合实际情况。此外,工作面前方的峰值支承压力并非随回采巷道侧向支承压力的增大而呈线性增大,因而在计算工作面前方的峰值支承压力时,不能将工作面的前支承压力和回采巷道的侧支承压力先分开计算后再进行简单叠加。
In order to analyze the influence of lateral abutment pressure around roadway on the peak value and plastic width of abutment pressure in front of working face,the concentration factor k of lateral abutment pressure around roadway is introduced on the basis of foundation beam model,and the roof dis⁃placement curve considering lateral abutment pressure around roadway is deduced.Through this curve,the abutment pressure and plastic width of orebody in front of working face can be calculated.And carry on tri⁃al calculation through corresponding engineering example,the calculation result shows that when calculat⁃ing the width of plastic zone and the peak value of abutment pressure in front of the working face,if the in⁃fluence of the lateral abutment pressure of the mining roadway is not considered,the calculation result will be low,which is not in line with the actual situation.In addition,the peak abutment pressure in front of the working face does not increase linearly with the increase of the lateral abutment pressure of the mining roadway,so when calculating the peak abutment pressure in front of the working face,the front abutment pressure of the working face and the lateral abutment pressure of the mining roadway cannot be calculated separately and then simply superimposed.
作者
吴呈哲
刘长武
赵超
WU Chengzhe;Liu Changwu;ZHAO Chao(College of Water Resource and Hydropower,Sichuan University;State Key Laboratory of Hydraulics and Mountain River Engineering)
出处
《现代矿业》
CAS
2021年第4期38-42,共5页
Modern Mining
关键词
巷道
侧向支承压力
支承压力峰值
塑性区宽度
roadway
lateral abutment pressure
peak abutment pressure
plastic zone width
