Rock and Soil Mechanics ›› 2021, Vol. 42 ›› Issue (7): 1828-1838.doi: 10.16285/j.rsm.2020.1649

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

General analytical solution for consolidation of sand-drained foundation considering the vacuum loading process and the time-dependent surcharge loading

LIN Wei-an, JIANG Wen-hao, ZHAN Liang-tong   

  1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou, Zhejiang 310058, China
  • Received:2020-11-04 Revised:2021-02-05 Online:2021-07-12 Published:2021-07-15
  • Supported by:
    This work was supported by Key Research and Development Program of Zhejiang Province (2019C03107).

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Abstract: Based on Barron’s equal strain consolidation theory, the consolidation governing equation of sand-drained foundation under vacuum combined surcharge preloading is derived and a general analytical solution is obtained, which considers the vacuum loading process, the time-dependent surcharge loading, the characteristics of the vacuum pressure decreasing along the depth and radial direction, and the well resistance of vertical drains and the vertical flow. The correctness of the analytical solution proposed in this paper is verified by comparing the degenerate analytical solution with the existing analytical solution and the finite difference solution. Based on the analytical solution, the consolidation behaviors of sand-drained foundation are analyzed. The analysis shows that the consolidation rate of sand-drained foundation is accelerated with the increase of vacuum loading factor ?. However, when ? increases to a certain extent, the influence of vacuum loading process on the consolidation rate of sand-drained foundation can be ignored. The consolidation rate of sand-drained foundation decreases with the increase of vacuum pressure attenuation coefficient k1 and k2. The consolidation rate of sand-drained foundation decreases with the increase of vacuum pressure p0 and increases with the increase of final surcharge loading qu. With the increase of loading time Th1, the consolidation rate of sand-drained foundation decreases gradually, and the consolidation rate is the largest under instantaneous surcharge loading.

Key words: vacuum loading process, surcharge loading, vacuum combined surcharge preloading, sand-drained foundation, general analytical solution

CLC Number: 

  • TU 472
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