摘要
上覆煤柱的赋存对采场围岩的应力和应变分布具有强烈的影响,通过数值计算分析有无上覆煤柱情况下的应力分布特征,研究上覆煤柱与工作面的水平、垂直距离及上覆煤柱埋深3个影响因素对支承应力分布的影响规律,并建立围岩峰值应力与上述影响因素之间的函数模型。模拟结果表明,煤壁片帮的发生对工作面应力分布有显著影响,无上覆煤柱时,超前峰值应力较高,影响范围较小。现场实践表明,工作面频繁出现强矿压显现,当工作面回采至上覆煤柱时,巷道变形达到危险值,通过合理调整液压支架工作状态,煤壁片帮得到了充分控制,巷道高度和宽度分别保持在2.95和5.66m,保证了工作面的安全生产。
The occurrence of overlying coal pillar has a strong influence on the stress and strain distri⁃bution of the surrounding rock of the stope.The stress distribution characteristics with no overlying coal pil⁃lar are analyzed by numerical calculation,and the influence rules of three factors,namely the horizontal and vertical distance between the overlying coal pillar and the working surface and the buried depth of the overlying coal pillar,on the support stress distribution are studied.The function model between the peak stress of surrounding rock and the above factors is established.The simulation results show that the occur⁃rence of coal wall sheeting has a significant effect on the stress distribution of the working face.When no coal pillar is covered,the leading peak stress is higher and the influence range is smaller.Field practice shows that strong ore pressure frequently appears on the working face,and when the top coal pillar is mined on the working face,the deformation of the roadway reaches the dangerous value.Through reasonable adjust⁃ment of the working state of the hydraulic support,the coal wall sheet is fully controlled,and the height and width of the roadway are maintained at 2.95 and 5.66 m respectively,ensuring the safe production of the working face.
作者
柴俊清
CHAI Junqing(Zhangjiawan Coal Industry Co.Ltd.,Shanxi Coal Transportation and Sales Group)
出处
《现代矿业》
CAS
2024年第3期95-98,共4页
Modern Mining
关键词
上覆煤柱
应力分布
围岩控制
巷道变形
煤壁片帮
overlying coal pillar
stress distribution
surrounding rock control
roadway deformation
rib spalling
作者简介
柴俊清(1980—),男,工程师,037007山西省大同市。
