【摘 要】
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Classification of tunnel surrounding rock is a precondition for rock property evaluation,stability determination,and reinforcement type selection.In order to precisely determine surrounding rock type
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Classification of tunnel surrounding rock is a precondition for rock property evaluation,stability determination,and reinforcement type selection.In order to precisely determine surrounding rock type and advanced quantitative classification for optimal design and effective construction of tunnel,this paper proposed a new method for classification of surrounding rocks based on the data of geotechnical investigation,design and construction of the Yanmenguan tunnel in China.In this paper,the comprehensive classification indicator of surrounding rocks are determined by wave velocity test and electrical resistivity test,and verified by preliminary geological investigation,so that a calculation model used for quantitative classify surrounding rock in the cross-section of tunnel construction can be established.For the purpose of guide tunnel design and construction effectively and appropriately,the stress and strain of tunnel cross-section are calculated according to parameters of quantitative classification model,then use the strain data fitting with the measured construction data,and accurate stress data that distributed around tunnel section can be finally determined and applied to select tunnel reinforcement and lining type.
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