不支护情况下不同断面尺寸硐室围岩稳定性数值模拟研究  

Study on Numerical Simulation of Surrounding Rock Stability in Different Cross Section Size Chamber under Condition of No Support

作　　者：曹紊源 娄培杰[1] 徐颖[1] 陈佩圆 CAO Wenyuan;LOU Peijie;XU Ying;CHEN Peiyuan(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001

出　　处：《建井技术》2021年第3期54-57,17,共5页Mine Construction Technology

摘　　要：以许疃煤矿3238风巷地质条件为背景,运用FLAC3D数值模拟方法,分析该风巷不同断面尺寸硐室在硐室开挖后,在没有支护情况下的断面尺寸对硐室围岩稳定性的影响。研究表明:随着硐室断面尺寸的增大,围岩垂直应力峰值增大,且峰值位置不断向围岩深部转移;更大范围的围岩通过硐室开挖来释放应力,硐室两帮水平应力回升至原岩应力所需的距离越远。塑性区变化,主要发生在硐室上下方。在距围岩表面4 m深以内,顶底板围岩位移差异明显;帮部围岩位移则随深度增加,越发明显。Based on the geological condition of No.3238 ventilation gateway in Xutuan Mine as the background,the FLAC3D numerical simulation method was applied to analyze the different cross section size chamber in the ventilation gateway after the excavation of the chamber and the cross section size affected to the surrounding rock stability of the chamber under the no support condition.The study showed that with the cross section size of the chamber increased and the vertical stress peak of the surrounding rock increased,the peak location would continuously migrate to the deep section of the surrounding rock.The surrounding rock with large range would release the stress with the excavation of the chamber and the horizontal stress in the two sidewalls of the chamber rebounded to the in-situ stress would require a far distance.The variation of the plastic zone mainly would be occurred above or underneath of the chamber.Within a depth of 4 m to the surface of the surrounding rock,the roof and floor displacement deference of the surrounding rock would be obvious.With the depth increased,the displacement of the sidewall surrounding rock would be more obvious.

关 键 词：不支护 硐室围岩 稳定性 FLAC3D 数值模拟 

分 类 号：TD354[矿业工程—矿井建设]