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| Theory and method for design of model tests of rock fragmentation processes by using shield boring machines |
| ZHANG Jiaolong1, GAO Yimin1, ZHANG Jian2, ZHOU Hao3, PAN Ye4, KE Lei5, LIU Xian1*
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1.College of Civil Engineering, Tongji University, Shanghai 200092, China;
2. Shenzhen Metro Construction Group Co., Ltd., Shenzhen 518000, Guangdong, China;
3. China Railway No.5 Engineering Group Co., Ltd., Guiyang 550003, Guizhou, China;
4. China Railway Design Corporation, Tianjin 300308, China;
5. The Fifth Engineering Co., Ltd., China Railway No.5 Engineering Group, Chenzhou 423002, Hunan, China |
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Abstract On the basis of theoretical analysis in the framework of specific energy, the main factors of such an interaction were summarized as: the size and the spacing distance of cutters, mechanical properties of stratum, and penetration. A method for design of scaled model tests of tunneling process, by means of shield boring machines, was proposed. The diameter of cutterhead was reduced, while the size and the spacing distance of cutters, the stratum, and the penetration were kept as the same as they were on site. Such a method was applied to a model test of the tunneling of the Cancer Hospital Metro Station of Shenzhen Line 14. This station was the first application of a new construction method which was characterized by that the station was firstly excavated by a small shield boring machine and then re-excavated by a larger one. The results of the model test allowed for predictions of the axial forces and the torque moments of the prototype cutterhead. The predicted values agree well with the monitored ones on site. This underlines the reliability of the proposed method for design of the model test. The originality of this work was highlighted by the quantitative relations between the quantities of the model and the prototype shield boring machines, which provides a reliable method for design of a model test of tunneling by means of shield boring machines.
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Received: 27 May 2021
Published: 20 December 2021
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