Experimental study and preliminary application on the confined compressive deformation characteristics of unsaturated filling soils

ZHANG Pei-ran; HUANG Xue-feng; HU Sheng-xia; YANG Xiao-hui

doi:10.16285/j.rsm.2017.1138

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Experimental study and preliminary application on the confined compressive deformation characteristics of unsaturated filling soils

更新时间：2026-06-25

- Experimental study and preliminary application on the confined compressive deformation characteristics of unsaturated filling soils
- Vol. 39, Issue 2, Pages: 437-444(2018)
- 作者机构：
  
  1. 兰州理工大学土木工程学院,甘肃,兰州,730050
  2. 解放军后勤工程学院土木工程系,重庆,401311
  3. 延安大学建筑工程学院,陕西,延安,716000
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2017.1138
  CLC： TU411
- Online First：06 June 2018，
  
  Published：2018
- 稿件说明：
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ZHANG Pei-ran, HUANG Xue-feng, HU Sheng-xia, et al. Experimental study and preliminary application on the confined compressive deformation characteristics of unsaturated filling soils[J]. 2018, 39(2): 437-444.
DOI：

ZHANG Pei-ran, HUANG Xue-feng, HU Sheng-xia, et al. Experimental study and preliminary application on the confined compressive deformation characteristics of unsaturated filling soils[J]. 2018, 39(2): 437-444. DOI： 10.16285/j.rsm.2017.1138.

摘要

为研究吸力及压实度对非饱和压实填土压缩变形特性的影响，并建立脱湿（吸力增长）状态下的填方土体工后沉降变形修正计算应用模型，开展了控制吸力和压实度的一维非饱和土侧限压缩试验。结果表明：压缩曲线平缓段随压实度和吸力的提高而增长，表明土样的结构屈服强度同步得到提高；在比容v变化差值序列上，饱和土压缩土样最大、常规压缩土样次之、脱湿土样最小，并且吸力越大，比容v变化差值越小。经历脱湿（吸力增长）后的压实土压缩性降低，定义和建立了吸力压缩系数及其经验模型，用以表征和度量吸力和压实度对压缩特性的影响规律及程度，发现随竖向应力增加呈现指数型衰减。对模型参数与压实土相关参量间的关联性进行了分析探讨，同一压实度土样不同吸力所对应的参数均值随压实水平提高而线性减小，参数λ总体上随吸力的增加而增大，但随压实度的提高吸力对于土体抗压性增强的贡献水平降低且参数试验数值点靠拢线性趋近线，土样的压缩性随压实度和吸力大小变化而动态调整。基于分层总和法的基本原理初步构造建立了高填方非饱和填土压缩变形修正计算模型（MS），其应用途径应建立在进一步对非饱和压实填土受荷状态下脱湿土-水特征关系的研究基础之上。

Abstract

To study the influence of suction and degree of compaction on the deformation of unsaturated filling soils

one-dimensional confined compression test of unsaturated soil was carried out to control suction condition and degree of compaction. Results show that the gentle stage of the compressive curve extends with the increase of compaction and suction

indicating the synchronously improved yield strength of soil samples. The saturated soil sample has the largest difference of the specific volume v during the test

and the dehydration soil sample changes the smallest. The greater the suction is

the smaller the difference of specific volume v is. Compressibility of compacted soil decreases after dehydrating or suction growth. The suction compressibility coefficient and its empirical model are defined and established to characterize the influence of suction and compaction on compressive characteristics and measure the influence degree. It is found that the model exhibits exponential decay with increasing the vertical stress. The relationship between the parameters of the model and relevant parameters of compacted soil are analyzed and discussed. The average value of the parameters corresponding to the different suctions of the same compacted soil sample decreases linearly with the increase of compaction level. The parameters generally increase with the increase of suction. However

with the increase of compaction degree

the contribution of suction to the compressive strength decreases and the experimental value point is close to the linear approaching line. The compressibility of soil samples is adjusted dynamically with the change of compaction and suction. Based on the basic principle of the layered summation method

a modified calculation model for the compressive deformation of the high fill unsaturated filling soils (MS) is established. The application of this model should be established on the study of the relationship between soil and water of unsaturated compacted filling soils on the loading state.

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