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| Linear cutting tests on effect of confining stress on rock fragmentation
by TBM cutter |
| MA Hongsu1,GONG Qiuming2,WANG Ju1,ZHAO Xiaobao3,YIN Lijun2,MIAO Chongtong2,HE Guanwen2 |
(1. CNNC Key Laboratory on Geological Disposal of High-level Radioactive Waste,Beijing Research Institute of Uranium Geology,Beijing 100029;2. Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China;3. NJU-ECE,Institute for Underground and Geo-environment,
Nanjing University,Jiangsu 210093, China) |
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Abstract In deep tunnel construction,TBM faces the rock stress problems induced by overburden or anisotropic stress,which had been under more and more attention. In this paper,full-scale cutting tests are presented to investigate the effect of different confining stresses,i.e. 0,5,10,and 15 MPa,on rock fragmentation of large intact granite sample with dimension of 1.0 m?1.0 m?0.6 m induced by TBM cutter. In these tests,the characteristics of force-time curves,normal forces,rolling forces,specific rock mass boreability index,chipping thickness and specific energy affected by confining stress were analyzed.
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