›› 2018, Vol. 39 ›› Issue (6): 1927-1934.doi: 10.16285/j.rsm.2016.2093

• Fundamental Theroy and Experimental Research •     Next Articles

Research on loosening earth pressure considering the patterns of stress distribution in loosening zone

XU Chang-jie1, 2, LIANG Lu-ju1, CHEN Qi-zhi1, LIU Yuan-kun1   

  1. 1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou, Zhejiang 310058, China; 2. School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, Jiangxi 330013, China
  • Received:2016-11-28 Online:2018-06-11 Published:2018-07-03
  • Supported by:

    This work was supported by the National Key Basic Research Project of China (973 Program) (2015CB057801) and the National Natural Science Foundation of China (51278449, 51238009, 51338009).

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Abstract: Traditional theory of soil arching effect is based on the assumption of homogeneous stress distribution in loosening zone. However, because of the influence of main stress axes deflection in loosening zone, the stress distribution is inhomogeneous. Based on Terzaghi’s loosening earth pressure theory, three types of major principal stress path are assumed and then a modified analytical solution of loosening earth pressure is presented considering the influence of stress distribution. DEM is also used to compare the model. The results show that when soils arrive ultimate equilibrium state, the distributions of vertical stress and horizontal stress in loosening zone are concave and convex respectively, and lateral earth pressure coefficient equals to passive earth pressure coefficient on the axle of the loosening zone. Difference among different major principal stress paths is less than 10% and these results are all in agreement with DEM numerical results, which confirms the effectiveness of the modified analytical solution. For the convenience of calculation, it is recommended to assume an arc path of major principal stress in the calculation of relevant projects.

Key words: soil arching effect, loosening zone, loosening earth pressure, stress distribution, DEM

CLC Number: 

  • TU 432

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