变荷载下考虑非达西渗流的一维固结半解析解

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Abstract A semi-analytical method，combining analytic solution for linear consolidation of layered soils with numerical discretization，is adopted to consider one-dimensional consolidation with non-Darcian flow under time-dependent loading，and semi-analytical solutions for this problem are obtained. The reliability of semi-analytical solutions was verified by comparing semi-analytical solutions to analytical solutions with Darcy?s flow and finite difference solutions with non-Darcian flow. Then consolidation behavior under various parameters is analyzed by a series of computation，and the results show that the parameters of non-Darcian flow have great influence on consolidation behavior；the greater the exponent and critical hydraulic grade，the slower the rate of consolidation；external load and the thickness of soil layer have great influence on consolidation behavior；the larger the load，the faster the rate of consolidation；the thicker the thickness of soil layer，the slower the rate of consolidation. Based on this non-Darcian flow，the similarity relationship that consolidation time is proportional to the square of the thickness of soil layer in classic theory of consolidation is no longer satisfied. The faster the loading rate，the faster the rate of consolidation. Finally，applicability of Darcy?s flow law to one-dimensional consolidation is analyzed.

Key words： soil mechanics non-Darcian flow described by exponent and threshold hydraulic gradient time- dependent loading one-dimensional consolidation semi-analytical solution

Received: 20 July 2010

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https://rockmech.whrsm.ac.cn/EN/Y2011/V30/IS2/3937

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