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| Research on the Parameters of Double – shield TBM BasedonMohr - Coulomb Criterion |
| WANG Yu - suo, HE Jun - nan，WU Hao, FENG Gao - fei，LI Zheng - hui，WANG Tao，ZHOU Liang， WANG Zhi – long |
| (Southwest Jiaotong University，Chengdu，Sichuan 610031，China) |
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Abstract Abstract ： Research purposes ： In the field of urban rail transit，the double - shield TBM was applied successfully in Qingdao subway for the first time. According to the mechanical coordination of cutter thrust force，support boots force， and strength of surrounding rock，the tunneling parameters and the mode selection can be obtained in the double shield TBM construction based on Mohr - Coulomb criterion，which was combined with the application of the double shield TBM in Qingdao metro. The research provides the basis for choosing the types and the adaptability of the double shield TBM. Research conclusions ：( 1) The double shield TBM can be advanced successfully with the double shield model in srnrounding rock of class I，II and IV，and the cutter thrust force can be provided by support boots. (2) Because the mechanical coordination of cutter thrust force，support boots force and strength of surrounding rock cannot be met，the double shield TBM cannot be advanced successfully under the double shield model. Then the single shield model was selected in surrounding rock of class V，and the react force was provided by concrete segment. (3 ) The tunneling parameters in different surrounding rock conditions can be obtained according to the mechanical coordination of cutter tlirust force，support boots force，and strength of surrounding rock under normal tunneling circumstance. (4) The results of research can provide a theoretical reference for the design and construction of TBM in the field of tlie urban rail transit.
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Received: 24 February 2017
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2017, Vol. 34 
