砂墊層對(duì)排水板地基固結(jié)效率的影響及設(shè)計(jì)方法
[Abstract]:Aiming at the design method of horizontal drainage sand cushion in drainage consolidation soft foundation treatment technology, the three-dimensional finite element analysis of fluid-solid coupling consolidation is carried out, and the influence of permeability coefficient, thickness and width of sand cushion on the consolidation of plastic drainage plate foundation is studied. It is revealed that the consolidation efficiency depends on the correlation between sand cushion parameters and soil parameters, and plastic drainage plate parameters. Based on this, the analytical solution of foundation diameter and vertical drainage consolidation of plastic drainage plate is equivalent to the analytical solution of pure vertical drainage consolidation, and the equivalent vertical permeability coefficient which can reflect the influence of soil parameters and plastic drainage plate parameters on foundation consolidation is derived, and the lumped parameters considering the influence of sand cushion, plastic drainage plate and soil on the consolidation efficiency of foundation are obtained. Through a large number of three-dimensional finite element calculations, the relationship between the lumped parameters and the consolidation efficiency of the foundation is analyzed. The design steps of sand cushion in plastic drainage board foundation are given, and the effectiveness of the design method is verified by the checking calculation of an engineering example. The results show that the consolidation efficiency of foundation increases hyperbolic with the increase of lumped parameters, and there is a lumped parameter value that meets the requirements of optimal consolidation efficiency, which can be used as the design control index of sand cushion under different soil properties and plastic drainage board parameters.
【作者單位】: 河海大學(xué)巖土力學(xué)與堤壩工程教育部重點(diǎn)實(shí)驗(yàn)室?guī)r土工程科學(xué)研究所;
【基金】:國(guó)家自然科學(xué)基金資助項(xiàng)目(51278171) 中央高校基本科研業(yè)務(wù)費(fèi)專項(xiàng)資金資助項(xiàng)目(2015B06014)~~
【分類號(hào)】:TU470
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