The influence of freeze–thaw cycles on the mechanical properties of paleosols: based on a multiscale research

IF 1.5 4区 农林科学 Q4 SOIL SCIENCE Canadian Journal of Soil Science Pub Date : 2022-09-02 DOI:10.1139/cjss-2021-0183
Cheng Yiqian, Zhang Peiran, Bai Yang, Zhou Zihao, Chen Yongxin, Yang Huimin
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Abstract

Abstract To investigate the multiscale effects of freeze–thaw cycles on the mechanical properties and structural damage of paleosols, remodeled paleosol specimens at natural moisture content were subjected to multiple freeze–thaw cycles, followed by scanning electron microscopy, nuclear magnetic resonance (NMR) pore testing, and triaxial shear testing, and then the shear strength deterioration mechanism of paleosols was elaborated on from three aspects: fine, mesoscopic, and macroscopic. The main experimental results were as follows: (1) at the fine level, the NMR T2 spectrum distribution curve showed one primary and two secondary peaks, in which the main spectrum occupied the majority, and the spectrum area showed an exponential function distribution relationship with the number of freeze–thaw cycles. With the accumulation of freeze–thaw cycles, the medium and large pores increased significantly. (2) At the mesoscopic level, when the specimens underwent freeze–thaw cycles, the interparticle contact pattern and particle morphology changed and the particle roundness increased. As the freeze–thaw cycle continued, fissures gradually developed and increased the most after the first freeze–thaw cycle, but the probability entropy of soil particles showed a decreasing trend with the increase of the number of freez–thaw cycles. (3) At the macro level, the number of freeze–thaw cycles gradually accumulated, the specimen stress–strain curve softened significantly, the shear strength deterioration effect was obvious, the deterioration value was the largest after one freeze–thaw cycle and gradually stabilized after 10 cycles, and the deterioration effect of cohesion was greater than that of the internal friction angle.
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冻融循环对古土壤力学特性的影响——基于多尺度研究
摘要为了研究冻融循环对古土壤力学性能和结构损伤的多尺度影响,对天然含水量下的重塑古土壤样品进行了多次冻融循环,然后进行了扫描电子显微镜、核磁共振(NMR)孔隙测试和三轴剪切测试,然后从细观、细观和宏观三个方面阐述了古土壤的抗剪强度劣化机理。主要实验结果如下:(1)在精细水平上,核磁共振T2谱分布曲线显示一个主峰和两个次峰,其中主谱占大多数,谱区与冻融循环次数呈指数函数分布关系。随着冻融循环的积累,中孔和大孔显著增加。(2) 在细观水平上,当试样经历冻融循环时,颗粒间接触模式和颗粒形态发生变化,颗粒圆度增加。随着冻融循环的继续,裂隙逐渐发育,并在第一次冻融循环后增加最多,但土壤颗粒的概率熵随着freez-解冻循环次数的增加呈下降趋势。(3) 宏观层面上,冻融循环次数逐渐累积,试样应力应变曲线明显软化,抗剪强度劣化效应明显,1次冻融循环后劣化值最大,10次循环后逐渐稳定,内聚力的劣化作用大于内摩擦角的劣化效果。
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来源期刊
Canadian Journal of Soil Science
Canadian Journal of Soil Science 农林科学-土壤科学
CiteScore
2.90
自引率
11.80%
发文量
73
审稿时长
6.0 months
期刊介绍: The Canadian Journal of Soil Science is an international peer-reviewed journal published in cooperation with the Canadian Society of Soil Science. The journal publishes original research on the use, management, structure and development of soils and draws from the disciplines of soil science, agrometeorology, ecology, agricultural engineering, environmental science, hydrology, forestry, geology, geography and climatology. Research is published in a number of topic sections including: agrometeorology; ecology, biological processes and plant interactions; composition and chemical processes; physical processes and interfaces; genesis, landscape processes and relationships; contamination and environmental stewardship; and management for agricultural, forestry and urban uses.
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