Analysis of consolidation of natural heterogeneous soils with a threshold hydraulic gradient

JIN Dan-dan; WANG Su; LI Chuan-xun

doi:10.16285/j.rsm.2018.0912

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Analysis of consolidation of natural heterogeneous soils with a threshold hydraulic gradient

更新时间：2026-06-25

- Analysis of consolidation of natural heterogeneous soils with a threshold hydraulic gradient
- Vol. 40, Issue 4, Pages: 1433-1440(2019)
- 作者机构：
  
  江苏大学土木工程与力学学院
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2018.0912
  CLC： TU472
- Published：2019
- 稿件说明：
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[1]金丹丹,王素,李传勋.考虑起始水力坡降的天然非均质地基固结分析[J].岩土力学,2019,40(04):1433-1440.

JIN Dan-dan, WANG Su, LI Chuan-xun. Analysis of consolidation of natural heterogeneous soils with a threshold hydraulic gradient[J]. 2019, 40(4): 1433-1440.
[1]金丹丹,王素,李传勋.考虑起始水力坡降的天然非均质地基固结分析[J].岩土力学,2019,40(04):1433-1440. DOI： 10.16285/j.rsm.2018.0912.

JIN Dan-dan, WANG Su, LI Chuan-xun. Analysis of consolidation of natural heterogeneous soils with a threshold hydraulic gradient[J]. 2019, 40(4): 1433-1440. DOI： 10.16285/j.rsm.2018.0912.

摘要

实际工程中通常为未经处理的天然非均质地基。低水力坡降下黏性土中渗流存在起始水力坡降的现象也逐渐被认可

但能考虑起始水力坡降的非均质地基固结模型鲜见报道。基于具有起始水力坡降的渗流模型

考虑实际中的变荷载

对压缩模量和渗透系数随深度变化的非均质地基固结问题展开研究。通过压缩模量随深度增加及渗透系数随深度减小考虑天然地基的非均质性

进而建立了单层非均质地基一维固结模型。分析了起始水力坡降i

非均质地基参数a、x、m和p对非均质地基固结特性的影响。结果表明:考虑起始水力坡降后非均质地基中孔压消散速率变慢

地基沉降以及固结速率随之降低;固结速率与参数a、x成正比

而地基的最终沉降量与之成反比;参数m越大

p越小

固结速率越快

但渗透系数仅改变地基的沉降速率

不会影响非均质土层的最终沉降量。

Abstract

In practical engineering

the foundation is usually untreated

natural and heterogeneous. The phenomenon that threshold hydraulic gradient exists in clayey soil under low hydraulic gradient is gradually recognized. However

the consolidation model of heterogeneous foundations considering threshold hydraulic gradient is rarely reported. In this paper

based on seepage model considering threshold hydraulic gradient

the consolidation problem of heterogeneous foundation was studied

the change law of compressive modulus and permeability coefficient with depth under variable loads were obtained. One-dimensional consolidation model of single-layer

heterogeneous foundation was established with an assumption that the compression modulus increases with depth

and the permeability coefficient decreases with depth. The influence of threshold hydraulic gradient i

heterogeneous foundation parameter a

m and p on the consolidation characteristics of heterogeneous foundation were analyzed. The results show that

the rate of pore pressure dissipation becomes slower in heterogeneous foundation after considering threshold hydraulic gradient and settlement as well as consolidation rate of the foundation decreases accordingly. The consolidation rate is directly proportional to the value of a and x while the final settlement of the foundation comes inversely proportional to them. The consolidation rate grows with the increase of m and the decrease of p. However

the permeability coefficient may only change the settlement rate of foundation

which will not affect the final settlement of the heterogeneous foundations.

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