高地应力隧道围岩分级BQ-hg法的研究及应用  

Research and Application of BQ-hg Method for Surrounding Rock Classification of Tunnels with High Geostress

作　　者：任洋[1] 李天斌[1] 张广洋[2] 牛文林[1] 林之恒 

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都610059 [2]四川雅西高速公路有限责任公司,成都610050 [3]中铁二院成都地勘岩土公司,成都610031

出　　处：《地下空间与工程学报》2011年第3期449-456,共8页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金项目(40772176);教育部创新团队发展计划(IRT0812);四川省青年科技基金项目(09ZQ026-083)

摘　　要：随着大量深埋越岭隧道的修建,高地应力问题对于围岩分级的影响越来越大。公路隧道设计规范中的围岩分级BQ法对于初始地应力影响的折减系数K3仅从高地应力和极高地应力两个方面进行考虑,而对于高地应力情况下影响围岩稳定的岩爆和大变形情况未加以区分和细化,从而造成BQ法在高地应力段特别是岩爆和大变形段的分级适应性较差。本文针对BQ法对于初始地应力折减系数K3该方面考虑不足的缺点,将高地应力情况的岩爆和大变形对围岩质量的影响引入围岩分级中,采用强度应力比值将岩爆烈度分为四个等级、大变形分为三个等级,各个等级对应相应的折减值,从而形成岩爆段和非岩爆段的初始地应力折减系数值K31,以及大变形段和非大变形段的初始地应力折减系数值K32,再以BQ法为基础建立了高地应力条件下的围岩分级BQ-hg法。通过对BQ-hg法进行围岩分级应用检验,其分级准确率较高,适应性较好,值得进一步完善和推广。With a large number of deep-lying mountain highway tunnels＇ construction,the high geostress impact on surrounding rock classification becomes bigger and bigger.The reduction factor K3 for initial geostress＇ influence by the BQ method of surrounding rock classification in Code for design of road tunnel merely considered high geostress and lofty geostress,the BQ method has poorly adapted species in high geostress with rock burst and large deformation surrounding rock section.Aiming at the deficiency of reduction factor K3 of BQ method with high ground stress,this article introduced the rock burst and large deformation into surrounding rock classification.Dividing the rock burst into four grades and the large deformation into three grades by strength-stress ratio,every grade has on relative reducing value,thus forming the reduction factor K31 of rock burst and K32 of non-rock burst and large deformation and non-large deformation,the BQ-hg method will be built based on BQ method in high geostress.Checking the surrounding rock classification by the BQ-hg method,it is found that this kind of classification has high accuracy and good adaptability,so it is worth of future improvement and promotion.

关 键 词：高地应力 BQ-hg法 围岩分级 岩爆 大变形 

分 类 号：O319.56[理学—一般力学与力学基础]