摘要
选取矩形、直墙半圆拱形、马蹄形、三心拱形、圆形和椭圆形6种巷道断面形状开展优化研究.采用FLAC5.0数值模拟软件研究了几种典型断面在岩体中开挖后巷道围岩塑性区分布、围岩主应力差分布和围岩变形特征,分析了不同侧压系数λ对它们的影响,在此基础上提出了巷道支护"等效开挖"的理念和"无效加固区"的概念.断面形状对高地应力巷道围岩主应力差分布影响不大,但等效开挖半径决定围岩塑性区分布,无效加固区越大,在巷道周边产生变形就越大,反之亦然.高应力巷道应根据λ的大小和主应力方向选择合理断面形状是圆形或椭圆形.
Six roadway sections,a rectangle,a straight wall with arched top,a horseshoe shaped,a three centered arch,an ellipse and a circle were studied.The plastic zone distribution,the principal stress differences and deformation of the rock surrounding the roadway were simulated with FLAC5.0.How changes in side-pressure-coefficient influence the three factors was determined.Roadway section was found to have little effect on the distribution of principal stress difference.The radius of excavation determines the distribution of the plastic zone：A larger void reinforced area results in greater deformation of the roadway surface,and vice versa.A circle or an ellipse is a reasonable section for a high stress roadway based on side-pressure coefficient and the orientation of principal stress.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2010年第5期652-658,共7页
Journal of China University of Mining & Technology
基金
国家自然科学基金青年基金项目(50904064)
国家重点基础研究发展计划(973)项目(2007CB209408)
教育部新世纪优秀人才支持计划(NCET-06-0478)
煤炭资源与安全开采国家重点实验室自主研究课题(SKLCRSM09X03)
中国矿业大学青年科研基金项目(2008A004
2007A006)
煤炭资源与安全开采国家重点实验室开放研究基金项目(08KF10
07KF04)
关键词
高地应力
巷道
围岩控制
断面优化
等效开挖
无效加固区
high ground stress
roadway
strata control
section optimization
equivalent excavation
void reinforced area
