›› 2010, Vol. 31 ›› Issue (12): 3778-3783.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Research on mechanical characteristics of weathered granite for subsea tunnel

GUO Xiao-hong 1, 2, LIANG Wei2, YU Hong-dan3, CAO Jun-jie3, CHEN Wei-zhong 3, 4   

  1. 1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China; 2. CCCC Second Highway Consultants Co., Ltd., Wuhan 430056, China; 3. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 4. Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan 250061, China
  • Received:2010-01-04 Online:2010-12-10 Published:2010-12-21

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Abstract:

Xiamen subsea tunnel is the first undersea road tunnel in China. The tunnel passes through the weathered strata F1, F2, F3 and F4 where the rock mass is weathered and fragmented, the main rock in this region is weathered and fragmented granite. The main mechanical characteristics of this kind of rock especially the strongly weathered granite is low strength, high compressibility, self-stability and bearing capacity of the rock is poor; it brings many exceptional problems to the liner design and the tunnel construction technology. In order to study the mechanical characteristics of the host rock in weathered strata, a series of laboratory tests for the rock including slightly weathered granite and strongly weathered granite have been carried out; the triaxial test results containing triaxial compression test and creep test of strongly weathered granite show that this kind of rock has the properties of low strength, large deformation and low elastic modulus; plastic flow will occur after the stress-strain curve reach the peak; and also the friction angle and cohesion are determined as about 31°and 0.1 MPa respectively through Mohr-Coulomb criterion; more over, high creep potentials of strongly weathered granite is shown through the triaxial creep test. Based on the triaxial test results, a rheological mechanics model suitable for host rock in strongly weathered strata was established through the creep test results. The results obtained from the research work are useful for soft rock engineering especially for weathered granite engineering, and it has guiding effect on the tunnels’ design and construction for this kind of rock.

Key words: subsea tunnel, weathered and fragmented granite, laboratory test, creep test, rheological mechanics model

CLC Number: 

  • U 452
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