Rock and Soil Mechanics ›› 2018, Vol. 39 ›› Issue (12): 4377-4384.doi: 10.16285/j.rsm.2017.0882

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Analytical solution for non-Darcian seepage field of a shallow circular tunnel in soft soil

ZHANG Bing-qiang1,2, WANG Qi-yun1,2, LU Xiao-ying3   

  1. 1. School of Civil Engineering, Fujian University of Technology, Fuzhou, Fujian 350118, China; 2. Key Laboratory of Underground Engineering, Fujian Province University, Fujian University of Technology, Fuzhou, Fujian 350118, China; 3. Transportation Investment Group of Pingtan Comprehensive Pilot Zone, Pingtan, Fujian 350400, China
  • Received:2017-05-05 Online:2018-12-11 Published:2018-12-31
  • Supported by:
    This work was supported by the Fujian Provincial Natural Science Foundation (2017J01671, 2015J05090) and the Science Foundation of Fujian University of Technology(GY-Z13118).

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Abstract: Flows of pore water in saturated soft soils would deviate from Darcy’s flow law under low hydraulic gradient, which is non Darcy seepage mode. Supposing that the velocity of flow is exponentially related to the hydraulic gradient, the analytical solutions of non-Darcy seepage field in shallow single-hole and double-hole circular tunnels are derived by using the principle of mirror method. The analytical solutions of non-Darcian seepage and Darcian seepage for shallow circular tunnels are compared and verified by case analysis. The influence of non-Darcy seepage index and the seepage coefficient ratio of soil to lining on tunnel seepage field is also discussed. The results show that the non-Darcy seepage index and the ratio of seepage coefficient have great influence on tunnel seepage and pore pressure of surrounding soil. With the increase of seepage index, the loss of water head in soil is accelerated, and the pore pressure and seepage flow around the tunnel are gradually reduced. With the increase of the ratio of seepage coefficient between soil and lining, the drainage capacity of lining is enhanced, the seepage flow of tunnel is gradually increased, and the pore pressure around the tunnel decreases more.

Key words: soft soil, circular tunnels, non-Darcian seepage, image method, analytical solution of seepage

CLC Number: 

  • TU447
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