Experimental study on the effect of particle breakage on the shearcharacteristics of large-displacement soil exposed to heat treatment

Suran Wang a,b , Yu Huang b,c,*

a Department of Civil Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, China

b Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China

c Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Tongji University, Shanghai 200092, China

Highlight

  1. High temperature affects the shear characteristics by affecting particle breakage.

  2. Particle breakage weakens the strain softening phenomenon.

  3. The effect of heat treatment on the density change of the sample after shearing is minimal.

  4. Normal stress is the main factor causing changes in sample density.

  5. After heat treatment, the particle breakage rate increases significantly.

摘要

Ring shear tests were performed in this study to investigate the large-displacement shear characteristics of quartz sand samples subjected to different degrees of volume effect and high temperature. The influencing principles of normal stress, temperature, and particle breakage on the large-displacement shear characteristics of the specimens were obtained. The influencing mechanism was further elucidated with reference to a previous study. On the basis of an analysis of the similarities and differences between the large-displacement shear behavior of samples before and after exposure to a temperature of 800°C, we believe that samples impacted by temperature, particle breakage, and normal stress exhibit strain softening under large-displacement shear behavior that has an upper limit of approximately 600 kPa after heat treatment. Meanwhile, the high temperature affects the shear characteristics of the basal facies of a landslide by influencing the rock and soil breakage. The difference in the interlocking forces caused by the particle shape and breakage and the resulting fluctuation of the shear stress are further discussed.

主要内容

本文介绍了一项关于颗粒破碎对经历热处理的大位移土壤剪切特性影响的实验研究。研究人员对石英砂样品进行了环剪切试验，施加不同程度的正应力和高温(800°C)，以研究这些因素对大位移剪切行为的影响。该研究旨在揭示正应力和温度影响下土壤系统中的动态机制和特征变化，包括应变软化、颗粒破碎、剪切应力和剪切应力波动。结果表明，受温度、颗粒破碎和正应力影响的样品在经历热处理后表现出大位移剪切行为下的应变软化，上限约为600 kPa。高温通过影响岩石和土壤的破碎来影响滑坡基底的剪切特性。

主要观点

  1. 对石英砂样品进行了环剪切试验，受到不同程度的正应力和高温(800°C)的影响，以研究大位移剪切特性。

  2. 受温度、颗粒破碎和正应力影响的样品在大位移剪切行为下表现出应变软化，在经过热处理后达到约600 kPa的上限。

  3. 高温影响岩土破碎,从而影响滑坡基底的剪切特性。

  4. 该研究旨在揭示正应力和温度影响下土体系统的动态机理和特征变化,包括应变软化、颗粒破碎、剪切应力和剪切应力波动。

引用格式

[1] Wang SR, Huang Y. Experimental study on the effect of particle breakage on the shear characteristics of large-displacement soil exposed to heat treatment [J]. Engineering Geology, 2023, 323:107219. https://doi.org/10.1016/j.enggeo.2023.107219