Pore characteristics and hysteresis curve morphology of expansive soil improved by EPS

doi:10.3785/j.issn.1008-973X.2022.07.011

Journal of ZheJiang University (Engineering Science)

2022, Vol. 56

Issue (7): 1353-1362, 1403 DOI: 10.3785/j.issn.1008-973X.2022.07.011

Pore characteristics and hysteresis curve morphology of expansive soil improved by EPS

Xin-shan ZHUANG(

),Mu-kai ZHOU,Rong ZHOU,Gao-liang TAO

School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, China

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Abstract

GDS dynamic triaxial apparatus and nuclear magnetic resonance analyzer were used to analyze the pore characteristics of the improved soil under different confining pressures and frequencies and the hysteretic curve morphology under dynamic cyclic loads, which were compared with the original expansive soil. The pore characteristics were analyzed by NMR signal distribution curve, and the morphology of hysteretic curve was quantitatively analyzed by the dip degree of long axis, hysteretic circle area, plastic deformation and fullness degree. The test results show that the total amount of pores in the improved soil and the original expansive soil decrease with the consolidation and cyclic load progression, while the pore size gradually compresses. The total amount and size of pores in the improved soil are close to the original soil. High confining pressure leads to the improved soil porosity reduction and make the strain become smaller under the same dynamic load condition. High frequency loading reduces the strain of the improved soil, and the number of pores and pore diameter in the soil increase correspondingly. The inclined degree of the long axis of hysteretic curve of improved soil gradually decreases and tends to be gentle with the increase of loading series and the development of dynamic strain, while the area of hysteretic circle, plastic deformation and fullness degree all show an upward trend. The increase of confining pressure and frequency increases the inclination degree of long axis, hysteretic circle area and fullness degree of the improved soil under the same dynamic strain condition. Different confining pressure and frequency have little influence on the development of plastic deformation in the early stage of dynamic strain development. High confining pressure and high frequency under the same dynamic strain correspond to higher plastic deformation when a critical point is exceeded.

Key words： expansive soil nuclear magnetic resonance (NMR) dynamic triaxial test pore characteristic hysteretic curve

Received: 15 July 2021 Published: 26 July 2022

CLC:

TU 443

Fund: 国家自然科学基金资助项目（51708190）

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Cite this article:

Xin-shan ZHUANG,Mu-kai ZHOU,Rong ZHOU,Gao-liang TAO. Pore characteristics and hysteresis curve morphology of expansive soil improved by EPS. Journal of ZheJiang University (Engineering Science), 2022, 56(7): 1353-1362, 1403.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2022.07.011 OR https://www.zjujournals.com/eng/Y2022/V56/I7/1353

EPS改良膨胀土孔隙特征与滞回曲线形态

利用GDS动三轴仪和核磁共振（NMR）分析仪，探究不同围压、频率条件下的改良土孔隙特征与动循环荷载下的滞回曲线形态，与原膨胀土进行对比. 采用核磁共振信号分布曲线对孔隙特征进行分析，通过长轴倾斜程度、滞回圈面积、塑性变形与饱满程度对滞回曲线形态进行定量分析. 试验结果表明，改良土与原膨胀土随固结、循环荷载级数推进，土中的孔隙总量下降，孔径逐步压缩，改良土中的孔隙总量与尺寸均有向原状土靠拢的趋势. 在相同的动荷载条件下，高围压使改良土中的孔隙减少，应变更小，高频加载使改良土的应变减小，土中孔隙数量与孔径相应提升. 随着加载级数的增加及动应变的发展，改良土滞回曲线长轴倾斜程度逐渐降低并趋于平缓，滞回圈面积、塑性变形与饱满程度均呈上升趋势. 在相同的动应变条件下，围压与频率的提升使得改良土长轴倾斜程度、滞回圈面积、饱满程度增大；在动应变发展前期，不同围压、频率对塑性变形的发展影响较小，当超过某一临界点时，相同动应变下的高围压与高频率对应更高的塑性变形.

关键词： 膨胀土, 核磁共振（NMR）, 动三轴试验, 孔隙特征, 滞回曲线

Tab.1 Basic physical-mechanical parameters of expansive soil

Tab.2 Dynamic triaxial cyclic loading test plan

Tab.3 Supplement NMR test protocol

Fig.1 Schematic diagram of quantitative parameters of hysteretic curve morphology

Fig.2 NMR signal distribution curve of modified soil at different test stages

Fig.3 NMR signal distribution and dynamic stress-strain curve of improved soil under different confining pressure and frequency

Fig.4 Variation curve of long axis tilt degree of hysteretic curve with dynamic strain

Fig.5 Variation curve of hysteretic curve area with dynamic strain

Fig.6 Variation curve of hysteretic curve area with dynamic stress

Fig.7 Variation curve of unclosed degree of hysteretic curve with dynamic strain

Fig.8 Variation curve of fullness of hysteretic curve with dynamic strain

Fig.9 NMR signal distribution curve and dynamic stress-strain curve at different test stages before and after modification

Fig.10 Variation curve of main parameters of hysteretic curve with dynamic strain before and after soil improvement

Tab.4 Fitting parameters of hysteretic curve morphological characteristic parameters


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