Experimental study on influencing factors of the coefficient of earth pressure at rest of peat soil

OU Mingxi; LI Qiang; HAN Zhongyu

doi:10.11835/j.issn.2096-6717.2024.040

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Experimental study on influencing factors of the coefficient of earth pressure at rest of peat soil

Civil Engineering | 更新时间：2026-03-30

- Experimental study on influencing factors of the coefficient of earth pressure at rest of peat soil
- Journal of Civil and Environmental Engineering Vol. 48, Issue 2, Pages: 90-99(2026)
- 作者机构：
  
  1.昆明理工大学建筑工程学院，昆明 650500
  2.西昌学院土木与水利工程学院，四川西昌 615000
- 作者简介：
  
  OU Mingxi (1983-), PhD, associate professor, main research interests: special rock and soil mechanics, E-mail: 19590927@163.com.
- 基金信息：
  
  National Natural Science Foundation of China(51968036)
- DOI：10.11835/j.issn.2096-6717.2024.040
  CLC： TU411.5
- Received：09 January 2024，
  
  Published：25 April 2026
- 稿件说明：
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欧明喜,李强,韩忠玉.泥炭土静止侧压力系数影响因素试验研究[J].土木与环境工程学报,2026,48(02):90-99.

OU Mingxi,LI Qiang,HAN Zhongyu.Experimental study on influencing factors of the coefficient of earth pressure at rest of peat soil[J].Journal of Civil and Environmental Engineering,2026,48(02):90-99.
欧明喜,李强,韩忠玉.泥炭土静止侧压力系数影响因素试验研究[J].土木与环境工程学报,2026,48(02):90-99. DOI： 10.11835/j.issn.2096-6717.2024.040.

OU Mingxi,LI Qiang,HAN Zhongyu.Experimental study on influencing factors of the coefficient of earth pressure at rest of peat soil[J].Journal of Civil and Environmental Engineering,2026,48(02):90-99. DOI： 10.11835/j.issn.2096-6717.2024.040.

摘要

静止侧压力系数

是解决岩土类工程问题的重要参数。为研究泥炭土

的影响因素和作用机理，采用

固结仪对昆明滇池泥炭土开展侧限压缩试验，系统分析了竖向应力、有机质含量和初始孔隙比对

的影响规律，并从结构性角度探讨

变化规律的形成机理。结果表明：重塑泥炭土的静止侧压力系数不是恒定常数，而是与竖向应力和有机质含量有关；加载时

随竖向应力的增加而减小，最后趋于稳定，且在较低竖向应力下

的减小趋势更显著；同一竖向应力下，有机质含量越大，

越小，整个加载过程

下降幅度越大；泥炭土结构性在加载过程中的动态变化是引起

变化的根本原因，竖向应力和有机质通过影响其结构性进而影响

，且两者间存在一定的耦合关系；重塑泥炭土稳定后

值在0.42~0.6之间，低于无机黏土，并与有机质含量存在线性负相关，基于试验结果提出了相应的拟合关系式；初始孔隙比与

值的关系较为离散。

Abstract

The coefficient of earth pressure at rest

is an important parameter for geotechnical engineering. In order to study the influencing factors and mechanisms of peat soil

consolidation instrument was used to conduct a lateral compression test on Kunming Dianchi peat soil. The effects of vertical stress

organic matter content and initial void ratio on

were systematically analyzed

and from the structural perspective

the formation mechanism of its

change law was explored. The test results show that the coefficient of earth pressure at rest of reshaped peat soil is not a constant

but is related to the vertical stress and content of organic matter;

decreases with the increase of vertical stress during loading and finally tends to be stable. The decreasing trend of

under stress is more significant; under the same vertical stress

the greater the organic matter content of the soil sample

the smaller

and the greater the decrease in

during the entire loading process; the dynamic changes in the structural properties of peat soil during the loading process are the fundamental cause of changes in

. Vertical stress and organic matter affect

by affecting its structural properties

and there is a certain coupling relationship between the two; the

value after stabilization of reshaped peat soil is between 0.42 and 0.6

which is lower than that of inorganic clay

and has a linear negative correlation with the organic matter content. Based on the experimental results

a corresponding fitting relationship is proposed; the relationship between the initial void ratio and the

value is relatively discrete.

关键词

Keywords

references

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