高地应力软岩隧道合理支护方案研究  

STUDY OF REASONABLE SUPPORT SCHEME FOR SOFT ROCK TUNNEL IN HIGH GEOSTRESS ZONE

作　　者：田洪铭[1] 陈卫忠[1,2] 谭贤君[1] 王辉[1] 田田[1] 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [2]山东大学岩土与结构工程研究中心,山东济南250061

出　　处：《岩石力学与工程学报》2011年第11期2285-2292,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51009133);湖北省自然科学基金资助项目(2010CDB10401)

摘　　要：基于高地应力软岩隧道明显流变效应的特点,提出在喷锚网支护的基础上增设U型钢可压缩支架和泡沫混凝土填充层的支护方案。利用建立的U型钢连接件力学模型和围岩与支架接触模型,分析2种支护方案下,宜昌—巴东(宜巴)高速公路峡口高地应力软岩隧道的长期稳定性。研究表明:(1)建立的U型钢可压缩支架的连接件力学模型和围岩与支架之间的接触模型可以很好地反映支架缩动性与摩阻力之间的关系;(2)U型钢可压缩支架和泡沫混凝土填充层的联合支护既可以吸收围岩的流变变形,减小二次衬砌上的形变压力,又可以提供稳定的支护力,有利于高地应力软岩隧道的长期稳定。Based on the evident rheology characteristic of soft rock tunnel in high geostress zone, a new support scheme which adds U-steels compressible stent and foam concretes filling layer to the spray anchor network support is proposed. The long-term stability of Xiakou soft rock tunnel with high geostress in Yichang-Badong expressway is studied by using the new U-steel connector mechanical model and contact model between U-steel and surrounding rock in two support schemes. The results show that- （1） The relationship between the compression and friction resistance for U-steel support is well reflected by the built model consisting of U-steel connector mechanical model and contact model between U-steel and surrounding rock. （2） The combined support of U-steels compressible stent and foam concretes filling layer can absorb rheological deformation of surrounding rocks, which reduces the deformation pressure of the secondary lining~ and also, it can provide stable supporting force, which is helpful to keep long-term stability for soft rock tunnel with high geostress.

关 键 词：隧道工程 软岩隧道 U型钢可压缩支架 支护方案 蠕变 

分 类 号：U45[建筑科学—桥梁与隧道工程]