深埋隧道岩爆倾向性评估方法

深埋硬岩隧道开挖过程中岩爆风险较高,开展岩爆倾向性评估方法研究具有重要意义。文章以某隧道工程为研究背景,统计分析了岩爆发生情况;将岩爆倾向性单指标评估方法按能否反映硐室开挖过程的影响和初始应力场的偏应力特征分为两类,并分别利用Barton判据、陶振宇判据、Hoek判据、二郎山隧道判据对该隧道岩爆倾向性进行了评估分析;对比分析了两类评估方法在该隧道应用的适用性,研究结果表明:反映洞室开挖过程影响和初始应力场偏应力特征的判据方法对岩爆倾向性判别的准确率较低,但能够判断岩爆可能发生位置,且在大尺度上采用Barton判据、陶振宇判据能较为准确评价岩爆风险等级。研究结果可为深埋隧道岩爆倾向性判别提供科学依据与参考。

Assessment Method of Rockburst Tendency in Deep Tunnels

Rockburst occurs frequently during excavation of deep hard rock tunnels.It has great significance to study the evaluation method of rockburst tendency.The occurrence of rockburst is analyzed statistically associated with the project of one tunnel.According to the influence of chamber excavation process and the deviatory stress characteristics of initial stress field,the single index evaluation method of rockburst tendency can be divided into two types.Using Barton criterion,Tao Zhenyu criterion,Hoek criterion and Erlang Mountain Tunnel criterion,the rockburst tendency of the tunnel is evaluated.The applicability of two kinds of assessment methods to rockburst tendency discrimination is compared and analyzed.Through the analysis,it is found that the criterion method,which reflects the influence of the excavation process and the initial stress field,can judge the location of the rockburst,although the accuracy rate of the rock burst tendency is low.The Barton criterion and Tao Zhenyu criterion can be used to evaluate the rockburst risk grade accurately on a large scale.The research results can provide scientific basis and reference for distinguishing the rockburst tendency of deep tunnels.