›› 2016, Vol. 37 ›› Issue (9): 2585-2592.doi: 10.16285/j.rsm.2016.09.020

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Upper bound analysis for supporting pressure of shield tunnel in heterogeneous soil

LIANG Qiao1, 2, YANG Xiao-li1, ZHANG Jia-hua1, ZHOU Wen-quan1, 2   

  1. 1. School of Civil Engineering, Central South University, Changsha, Hunan 410075, China; 2. Department of Construction Engineering, Hunan Institute of Engineering, Xiangtan, Hunan 411104, China
  • Received:2015-01-29 Online:2016-09-12 Published:2018-06-09
  • Supported by:

    This work was supported by the National Program on Key Basic Research Project of China (2013CB036004), the National Natural Science Foundation (51178468, 41302226) and the Provincial Natural Science Foundation of Hunan (2015JJ4019).

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Abstract: Based on the logarithmic spiral collapse mechanism, and with considering the heterogeneity of clayey soil, the optimal upper bound solution of the face supporting pressure is obtained in heterogeneous soil in which the cohesive force varies linearly. The validity of the proposed solution is demonstrated by comparing the calculated results with the monitoring data and the results of model tests. In addition, the optimal supporting pressures and the logarithmic spiral sliding surfaces are analyzed in details for various soils. It is shown that in heterogeneous soils the soil cohesion and internal friction angle are the controlling factors. A design chart is developed for the limit supporting pressures in heterogeneous soils.

Key words: heterogeneous soil, logarithmic spiral, supporting pressure, upper bound method, initial cohesion

CLC Number: 

  • U 451+.2

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