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| NEW METHOD FOR STABILITY EVALUATION OF SOIL
AND SOFT ROCK TUNNELS |
| LI Ning1，2，LIU Naifei1，LI Guofeng1 |
| (1. Institute of Geotechnical Engineering，Xi?an University of Technology，Xi?an，Shaanxi 710048，China；2. State Key Laboratory of Frozen Soil Engineering，Cold and Arid Regions Environmental and Engineering Research Institute，Chinese Academy of Sciences，Lanzhou，Gansu 730000，China) |
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Abstract 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.
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Received: 28 April 2014
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2014, Vol. 33 
