›› 2011, Vol. 32 ›› Issue (9): 2609-2616.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Three-dimensional model test for secondary mechanical effect of existing forked tunnel with different altitudes

LIU Xin-rong1, 2，GUO Zi-hong1, 2, 3，PEI Li1，WANG Ji-ming1，LIN Zhi4，WANG Fang-qi4   

  1. 1. College of Civil Engineering, Chongqing University, Chongqing 400045, China; 2. Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing University, Chongqing 400045, China; 3. Urban and Rural Construction College, Sichuan Agricultural University, Dujiangyan, Sichuan 611830, China; 4. Chongqing Communications Research and Design Institute, Chongqing 400067, China
  • Received:2010-01-20 Online:2011-09-10 Published:2011-09-13

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Abstract: Based on system for structure and surrounding rockmass of highway tunnel, a three-dimensional model tests about forked tunnel with different altitudes were carried out to study the influence of construction of new forked tunnel with different altitudes on existing tunnel. Existing tunnel’s internal forces of supporting structure, surrouding rockmass internal pressure and internal displacements induced by constructing new tunnel, were measured. Testing data show as follows. Existing tunnel’s crown radial stress and hance tangential stress are keeping increasing, and crown tangential stress and hance radial stress are keeping decreasing. Surrounding rockmass internal displacements are compression deformation at crown and tensile deformation at hance. Existing tunnel’s axial forces and bonding moments of supporting structure keep increasing; and right hance moment of supporting structure increased most obviously. Constructing new tunnel has bad influence on existing tunnel’s section L1 and L4, and has little influence on existing tunnel’s section L8. The area in which adjacent spacing is less than section L8 should be strengthened.

Key words: forked tunnel with different altitudes, secondary mechanical effect, model test, existing tunnel

CLC Number: 

  • U 451
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