›› 2010, Vol. 31 ›› Issue (5): 1402-1406.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Modified Terzaghi loozening earth pressure based on theory of main stress axes rotation

CHEN Ruo-xi 1, 2, ZHU Bin1, CHEN Yun-min1, CHEN Ren-peng1   

  1. 1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China; 2. Zhejiang Electric Power Design Institute, Hangzhou 310027, China
  • Received:2008-12-22 Online:2010-05-10 Published:2010-05-24

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Abstract:

Based on the theory of main stress axes rotation, the analytical expression of the lateral earth pressure coefficient of the soil overlying on the Trapdoor is presented; and the traditional Terzaghi loosening earth pressure is modified. For the cohesionless soil, the coefficient is only related to the effective internal friction angle of soil; and its value varies from 1.0 to the passive earth pressure coefficient Kp. It increases with the increase of the effective internal friction angle of the soil. For the cohesive soil, the modified Terzaghi loosening earth pressure is influenced by the thickness, unit weight, effective cohesion and the effective internal friction angle of the overlying soil on the Trapdoor as well as the trapdoor width. Compared with the traditional expressions, the proposed one of the Terzaghi loosening earth pressure is more in agreement with the experimental ones and FLAC numerical results. It can be used to analyze the soil-arching effect in the engineering of underground pipe, local subsidence of ground, tunnel and so on.

Key words: main stress axes, rotation, soil-arching effect, loosening earth pressure

CLC Number: 

  • TU 472
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