摘要
选取矩形、梯形、直墙拱形、马蹄形、椭圆形和圆形等共6种不同断面形状的巷道进行优化研究,基于FLAC3D模拟研究了这6种典型巷道开挖后的巷道围岩变形特征及围岩塑性区分布规律,分析了不同侧压力系数对它们的影响。数值模拟结果表明,巷道断面形状对高应力巷道围岩变形特征及围岩塑性区分布影响较大;根据侧压力系数的大小及主应力方向,圆形、椭圆形为深部高应力巷道最优断面形状,选择圆形、椭圆形巷道可改善巷道围岩应力状态,降低围岩变形量,减少围岩塑性区损伤破坏范围,有利于深部高应力软岩巷道的长期稳定。
In this paper, roadways with different cross-section shapes, including rectangular, trapezoi- dal, straight wall arch, horseshoe-shaped, oval and round shape, are selected to be optimized. Based on FLAC3D simulation, the surrounding rock deformation characteristics and rock plastic zone distribution are studied after the excavation of six kinds of typical roadway, and the influence of different side pres- sure coefficient to them is also analyzed. The numerical simulation results show that the cross-section shape has large effect on the deformation characteristics and plastic zone distribution of surrounding rock. According to the size of side pressure coefficient and direction of principal stress, the round and oval shapes are the optimal cross-section shapes of deep roadway under high ground stress. Thus, se- lecting the roadways with round and oval shapes, can improve the stress state of surrounding rock, re- duce the deformation amount and damage range of plastic zone in surrounding rock, which is beneficial to the long-term stability of deep soft rock roadway under high stress.
出处
《采矿与安全工程学报》
EI
北大核心
2012年第5期650-656,共7页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(51174196)
教育部新世纪优秀人才支持计划项目(NCET-07-0519)
