真空–堆载联合预压下竖井地基大变形非线性固结模型

doi:10.13722/j.cnki.jrme.2019.0280

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摘要真空–堆载联合预压法是加固软土地基的常见方法。针对该方法，建立合理的计算方法对相关实际工程的设计和分析具有重要意义。基于分段线性方法，建立真空–堆载联合预压下竖井地基大变形非线性固结沉降模型，简称VRCS1模型。首先对VRCS1模型的建立过程进行描述，相比于现有的大应变解，考虑固结过程的多种影响因素并采用分段线性方法来表示土体的压缩性和渗透性使得VRCS1模型具有更广泛的适用范围；然后将VRCS1模型与现有的小变形解析解、大变形数值解、大型室内试验进行对比验证，均吻合很好，表明VRCS1模型能够准确计算竖井地基大变形非线性固结过程；最后，使用本模型对曼谷第二国际机场某路堤的固结沉降过程进行了计算分析，与现场实测结果吻合良好。

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	杨鹏
	蒲诃夫
	郑俊杰
	宋丁豹
	陈训龙

关键词 ：土力学, 饱和软土, 竖井地基, 大变形固结, 数值模型, 非线性材料参数, 非达西流

Abstract：Vacuum-surcharge combined preloading is a commonly used method for soft ground improvement. Aiming at developing a reasonable calculation method for evaluating foundation settlement process in engineering practice, a numerical model called VRCS1 to calculate the large-strain radial consolidation of saturated soft soils stabilized by the vacuum-surcharge combined preloading method was developed based on the piecewise-linear approach. The algorithms of VRCS1 model were deduced，and comparisons between the VRCS1 model with the existing small-strain analytical solution，large-strain numerical solution and large-scale laboratory experiments were conducted. It is shown that the VRCS1 model can accurately simulate the process of large-strain radial consolidation of saturated soft soils. Besides，compared with the existing large-strain solutions in the literature，VRCS1 model has a wider range of application due to considering a variety of complex factors involved in the radial consolidation process and adopting the piecewise-linear method to define the compressibility and permeability of soils. VRCS1 model was used to calculate the settlement of an embankment at Second Bangkok International Airport，Thailand，and good agreement between VRCS1 model calculations and field measurements was obtained.

Key words： soil mechanics saturated soft soil ground with vertical drain large-strain consolidation numerical model nonlinear material properties non-darcian flow

引用本文:

杨鹏，蒲诃夫，郑俊杰，宋丁豹，陈训龙. 真空–堆载联合预压下竖井地基大变形非线性固结模型[J]. 岩石力学与工程学报, 2019, 38(10): 2103-2111.
YANG Peng，PU Hefu，ZHENG Junjie，SONG Dingbao，CHEN Xunlong. A large-strain nonlinear consolidation model of saturated soft soils stabilized by the vacuum-surcharge combined preloading method. , 2019, 38(10): 2103-2111.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2019.0280 或 http://www.rockmech.org/CN/Y2019/V38/I10/2103

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