大相岭泥巴山隧道岩爆防治数值模拟分析  

Numerical Simulation Analysis of Rockburst Prevention in the Nibashan Tunnel

作　　者：邓林[1] 吕燕[1] 邓荣贵[2] 

机构地区：[1]四川建筑职业技术学院,德阳618000 [2]西南交通大学土木工程学院,成都610031

出　　处：《现代隧道技术》2012年第5期51-55,共5页Modern Tunnelling Technology

基　　金：交通部西部交通科技资助项目(2006318000104)

摘　　要：大相岭泥巴山隧道为雅安—泸沽高速公路的控制性工程,由于隧道埋深大、地应力高、穿越的地层主要为硬脆性围岩,洞室开挖后岩爆时有发生。文章以该工程为背景,通过数值模拟分析了开挖中采用锚喷支护措施对减弱或防治岩爆的效果,并对不同锚杆长度和间距的防治效果进行了对比分析。结果表明:采用锚喷支护能够降低最大主应力、增大最小主应力、减少主应力差,可以有效降低岩爆的烈度;采用间距1m、长度3m的锚杆进行锚喷支护最经济有效。The Nibashan tunnel is the key project on the Ya＇an - Lugu highway, and rockbursts occur frequently after excavation due to the depth, high geostress, and brittleness of the surrounding rock. Thus it is necessary to effectively prevent and treat rockburst in order to ensure the safety of personnel and equipment. Using this project as a background, this paper analyzes the effects of such preventive measures as sprayed concrete and rockbolts and compares different bolt lengths and spacings using a numerical model. The results indicate that the application of sprayed concrete and rock bolts can reduce the maximum principal stress, increase the minimum principal stress, reduce the difference of principal stress, and effectively reduce the intensity of rockbnrsts. It is very cost effective to use the 3m rock bolt with a spacing of 1m.

关 键 词：公路隧道 岩爆防治 数值模拟 锚喷支护 

分 类 号：U457.5[建筑科学—桥梁与隧道工程]