摘要
选取矩形、直墙拱形、梯形、圆形和椭圆形共5种典型断面形状的巷道,基于UDEC程序分析巷道的围岩能量释放特征、应力及塑性区分布规律,并分析水平构造应力对它们的影响。研究结果表明:巷道围岩稳定性受断面形状影响显著,巷道边界线越光滑,能量释放量越低,主应力差不均匀区域及塑性区范围越小;深井巷道的最优断面形状为圆形及椭圆形。针对围岩的不同应力状态选择不同的断面形状,能够有效减少围岩塑性区及主应力差分布不均匀区域的范围,降低巷道的冲击危险性。
Based on UDEC software and comprehensive analysis of energy release characteristics, the distribution laws of stress and plastic zone of surrounding rock were carried out for five kinds of cross section shapes, i.e. rectangular, trapezoidal, straight-wall-top-arch, circular and oval, and the influence of horizontal tectonic stress was also analyzed. The results show that cross-section shape has great influence on the stability of surrounding rock. When the roadway boundary is smoother, the amount of energy release is lower, and the uneven distribution areas of principal stress differences and the plastic zone are smaller; meanwhile, and the optimal cross section shapes of deep roadway are circular and oval. The reasonable cross section shape chosen according to different stress states of surrounding rock can effectively reduce the range of plastic zone and the uneven distribution areas of principal stress differences as well as the risk of rock burst.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2015年第9期3354-3360,共7页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51379116)
山东科技大学研究生科技创新基金资助项目(YC150302)~~
关键词
能量释放
水平应力
主应力差
断面优化
数值模拟
energy release
horizontal stress
principal stress differences
cross-section optimization
numericalsimulation
