Rock and Soil Mechanics ›› 2020, Vol. 41 ›› Issue (2): 461-468.doi: 10.16285/j.rsm.2019.0401

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Consolidation analysis of foundation with sand blankets under ramp loading

MENG Yu-han1, 2, 3, ZHANG Bi-sheng4, CHEN Zheng5, MEI Guo-xiong1, 2, 3   

  1. 1. Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning, Guangxi 530004, China; 2. Guangxi Key Laboratory of Disaster Prevention and Structural Safety, Guangxi University, Nanning, Guangxi 530004, China; 3. College of Civil Engineering and Architecture, Guangxi University, Nanning, Guangxi 530004, China; 4. Jiangsu Testing Center for Quality of Construction Engineering, Nanjing, Jiangsu 210028, China; 5. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University, Wuhan, Hubei 430072, China
  • Received:2019-02-22 Revised:2019-05-08 Online:2020-02-11 Published:2020-02-08
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51578164, 41672296, 51878185), the Innovative Research Team Program of Guangxi Natural Science Foundation (2016GXNSFGA380008), the Changjiang Scholars Program of the Ministry of Education of China (T2014273), the Bagui Scholars Program (2016A31) and the China Scholarship Council (CSC) (201906660001).

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Abstract: Aiming at the consolidation of foundation with the horizontal sand blankets, a two-dimensional consolidation model under ramp loading was established, and the corresponding semi-analytical solution was obtained using boundary transform method. Based on this solution, the effects of geometric and physical parameters of sand blankets and ground soil on the consolidation subjected to ramp loading was analyzed. The results show that the consolidation rate increases with the increase of horizontal permeability coefficient but decreases with the increase of foundation width for the soil. For sand blankets, the consolidation rate increases with the increase of sand blankets thickness and horizontal permeability coefficient. In addition, for the external loads, the faster the loading rate, the shorter the time required for the pore pressure to reach the peak value, and the higher the consolidation rate of the foundation. Lastly, the influence of horizontal permeability coefficient and thickness on the permeability of the sand blankets was considered comprehensively. When the boundary condition of the interface of sand blanket and soil foundation is close to the full drainage boundary condition, the parameter needs to be greater than 200 ( is the thickness of the sand blankets, and is the horizontal permeability coefficient of the sand blankets, is the width of soil foundation, and is the vertical permeability coefficient of soil foundation).

Key words: sand blankets, two-dimensional consolidation, ramp loading, boundary transform method, semi-analytical solution

CLC Number: 

  • TU 449
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