不同初始空隙率下宽吸力范围土壤的剪切强度方程

IF 2.5 3区地球科学 Q3 ENVIRONMENTAL SCIENCES

Vadose Zone Journal Pub Date : 2024-07-12 DOI:10.1002/vzj2.20368

Zhaoyang Song, Zhihong Zhang

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引用次数: 0

摘要

剪切强度方程是解决许多岩土工程问题的基本理论。尽管剪切强度方程已受到广泛关注，但仍无法很好地预测粘土在宽吸力范围和不同初始空隙率条件下的剪切强度。本研究旨在建立一个适用于宽吸力范围内土壤的新强度方程。考虑到土水相互作用中的毛细作用和吸附作用，提出了与吸附水饱和度 Sra 有关的内聚力表达式和与毛细水饱和度 Src 有关的有效应力。然后，根据莫尔-库仑理论，提出了各种吸力下非饱和土在宽吸力范围内的剪切强度方程。方程中包含五个参数。通过对饱和土和完全干燥土进行剪切试验，很容易校准这些参数。结果表明，不仅可以很好地预测砂质粘土和粘土粉土，而且可以很好地预测膨胀土在各种吸力下的剪切强度。

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Shear strength equation of soils in a wide suction range under various initial void ratios

Shear strength equation is a basic theory for solving many geotechnical engineering problems. Although the shear strength equation has received widespread attention, shear strength of clay under wide suction range and different initial void ratio conditions cannot be well predicted. This study aims to establish a new strength equation applicable to soils within a wide suction range. Considering the capillary and adsorptive parts of soil–water interactions, a cohesion expression related to the degree of adsorbed water saturation Sra and the effective stress related to the degree of capillary water saturation Src are proposed. After that, based on the Mohr–Coulomb theory, a shear strength equation of unsaturated soils in a wide range of suction under various is proposed. Five parameters are included in the equation. It is easy to calibrate them through shear tests on saturated and the fully dried soils. It is verified that not only the sandy clay till and clayed silt but also the expansive soil's shear strength in wide ranges of suction under various can be well predicted.

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来源期刊

Vadose Zone Journal 环境科学-环境科学

CiteScore

5.60

自引率

7.10%

发文量

审稿时长

3.8 months

期刊介绍： Vadose Zone Journal is a unique publication outlet for interdisciplinary research and assessment of the vadose zone, the portion of the Critical Zone that comprises the Earth’s critical living surface down to groundwater. It is a peer-reviewed, international journal publishing reviews, original research, and special sections across a wide range of disciplines. Vadose Zone Journal reports fundamental and applied research from disciplinary and multidisciplinary investigations, including assessment and policy analyses, of the mostly unsaturated zone between the soil surface and the groundwater table. The goal is to disseminate information to facilitate science-based decision-making and sustainable management of the vadose zone. Examples of topic areas suitable for VZJ are variably saturated fluid flow, heat and solute transport in granular and fractured media, flow processes in the capillary fringe at or near the water table, water table management, regional and global climate change impacts on the vadose zone, carbon sequestration, design and performance of waste disposal facilities, long-term stewardship of contaminated sites in the vadose zone, biogeochemical transformation processes, microbial processes in shallow and deep formations, bioremediation, and the fate and transport of radionuclides, inorganic and organic chemicals, colloids, viruses, and microorganisms. Articles in VZJ also address yet-to-be-resolved issues, such as how to quantify heterogeneity of subsurface processes and properties, and how to couple physical, chemical, and biological processes across a range of spatial scales from the molecular to the global.