软岩及土质隧洞围岩稳定性评价新方法  

NEW METHOD FOR STABILITY EVALUATION OF SOIL AND SOFT ROCK TUNNELS

作　　者：李宁[1,2] 刘乃飞[1] 李国峰[1] 

机构地区：[1]西安理工大学岩土工程研究所,陕西西安710048 [2]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃兰州730000

出　　处：《岩石力学与工程学报》2014年第9期1812-1821,共10页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(50879068);国家自然科学基金创新群体项目(40821001);西安理工大学优博创新基金项目(207–002J1306)

摘　　要：首先提出对于软岩(土质)隧洞及时支护下的围岩变形稳定性可转化为支护结构的安全性这一评判理念,在此基础上进一步将初期支护(喷层)不出现拉压破坏时围岩与支护结构的对应变形作为评判标准,提出软质隧洞围岩稳定性评判新思路;考虑到支护结构内力的监测不便、不准,而支护结构的收敛变形监测较为方便与可靠这一工程现实,再次通过数值试验的方法,将支护结构的极限应力科学地转化为对应的支护结构的允许变形,进而建立能够考虑初期支护安全性的围岩稳定性评价新方法。该评判方法在新疆库尉输水隧洞工程的成功应用表明其具有较好的可靠性和适用性。Since the deformation criterion of the surrounding rock was possible to be converted into the safety criterion of the supporting structures of tunnels,a new idea of stability assessment of surrounding rock was proposed. The deformation of the initial support at the critical state prior to the shotcrete damage due to the tensile or compressive stresses was taken as the criterion. Considering the inconvenience of shotcrete stress measurement accurately and the convenience and reliablility of the deformation monitoring,the critical stresses of shotcrete were then transformed into the corresponding critical deformations of shotcrete structures by the systematical numerical tests. The new method for stability evaluation of surrounding rocks considering the safety of the supporting structures was proposed for soft rock-mass tunnels. Applications of this new method to some tunnels successfully demonstrate its adequacy.

关 键 词：岩石力学 软岩隧洞 及时支护 混凝土喷层应力 稳定性评价 

分 类 号：TU45[建筑科学—岩土工程]