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《Chinese Journal of Underground Space and Engineering》 2017-03
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Study on the Identification of Non-convex Key Blocks at Tunnel Portal

Li Jianyong;Yuan Guangxiang;Zhao Yang;Zhang Yumin;Huang Zhiquan;School of Resources and Environment,North China University of Water Resources and Electric Power;  
The portals of tunnels are often prone to be areas of accidents in the underground rock engineering.There may exist non-convex blocks cutting roof,wall and portal slope at the same time.The theorem of finiteness of convex blocks in the classical block theory is not applicable to non-convex blocks.Firstly,aiming at the characteristics of union operation between the concave combinations of free planes,a generalized symbolic representation method used for convex and non-convex block is proposed.According to the composition theorem of general rock blocks,the criterion of identification is deduced.The non-convex block is finite or not is judged by all its sub convex blocks.All the finite convex blocks in the system are searched out by enumeration.All the finite nonconvex blocks can be combined in term of the same codes of joints.Furthermore,if a non-convex block is cut successively along the free planes with concave intersection,an optimized combination of the non-convex block can be obtained,which the sub convex blocks are connected only at the cutting free planes.Finally,the identification of nonconvex key blocks at tunnel portal can be realized.The theoretical significance of this method is that the expansion of the application scope of block theory,from the convex block to non-convex block,and it also has a certain practical value in actual engineering.
【Key Words】: tunnel portal non-convex block generalized symbolic representation identification criteria
【Fund】: 华北水利水电大学高层次人才科研启动项目(40274);; 国家自然科学基金(41402269 51409102)
【CateGory Index】: U451.2
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【Co-citations】
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1 Li Jianyong;Yuan Guangxiang;Zhao Yang;Zhang Yumin;Huang Zhiquan;School of Resources and Environment,North China University of Water Resources and Electric Power;;Study on the Identification of Non-convex Key Blocks at Tunnel Portal[J];地下空间与工程学报;2017-03
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