Experimental Study on Critical Shear Stress of Cohesive Soils and Soil Mixtures

IF 1.4 4区 农林科学 Q3 AGRICULTURAL ENGINEERING Transactions of the ASABE Pub Date : 2021-01-01 DOI:10.13031/TRANS.14065
Xiaojing Gao, Qiusheng Wang, Chongbang Xu, Ruilin Su
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Abstract

Highlights Erosion tests were performed to study the critical shear stress of cohesive soils and soil mixtures. Linear relationships were observed between critical shear stress and cohesion of cohesive soils. Mixture critical shear stress relates to noncohesive particle size and cohesive soil erodibility. A formula for calculating the critical shear stress of soil mixtures is proposed and verified. Abstract. The incipient motion of soil is an important engineering property that impacts reservoir sedimentation, stable channel design, river bed degradation, and dam breach. Due to numerous factors influencing the erodibility parameters, the study of critical shear stress (τc) of cohesive soils and soil mixtures is still far from mature. In this study, erosion experiments were conducted to investigate the influence of soil properties on the τc of remolded cohesive soils and cohesive and noncohesive soil mixtures with mud contents varying from 0% to 100% using an erosion function apparatus (EFA). For cohesive soils, direct linear relationships were observed between τc and cohesion (c). The critical shear stress for soil mixture (τcm) erosion increased monotonically with an increase in mud content (pm). The median diameter of noncohesive soil (Ds), the void ratio (e), and the organic content of cohesive soil also influenced τcm. A formula for calculating τcm considering the effect of pm and the τc of noncohesive soil and pure mud was developed. The proposed formula was validated using experimental data from the present and previous research, and it can reproduce the variation of τcm for reconstituted soil mixtures. To use the proposed formula to predict the τcm for artificial engineering problems, experimental erosion tests should be performed. Future research should further test the proposed formula based on additional experimental data.
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黏性土及混合土临界剪应力试验研究
重点进行了侵蚀试验,以研究粘性土和混合土的临界剪应力。黏性土的临界剪应力与黏性土的黏聚力呈线性关系。混合物临界剪应力与非黏性颗粒大小和黏性土壤的可蚀性有关。提出并验证了混合土临界剪应力的计算公式。摘要土壤初动是影响水库沉降、稳定河道设计、河床退化和溃坝的重要工程性质。由于影响可蚀性参数的因素很多,黏性土和混合土的临界剪应力τc的研究还很不成熟。利用侵蚀函数仪(EFA)研究了土壤性质对重塑黏性土壤、黏性和非黏性混合土(含泥量为0% ~ 100%)τc的影响。黏性土τc与黏聚力(c)呈线性关系。混合土侵蚀的临界剪应力(τcm)随含泥量(pm)的增加而单调增加。非粘性土的中位直径Ds、空隙比e和粘性土的有机质含量对τcm也有影响。建立了考虑非粘性土和纯泥的pm和τc影响的τcm计算公式。本文和前人的实验数据验证了所提公式的正确性,该公式能较好地再现复合土的τcm变化。为了利用所提出的公式来预测人工工程问题的τcm,必须进行侵蚀试验。未来的研究应基于更多的实验数据进一步验证所提出的公式。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Transactions of the ASABE
Transactions of the ASABE AGRICULTURAL ENGINEERING-
CiteScore
2.30
自引率
0.00%
发文量
0
审稿时长
6 months
期刊介绍: This peer-reviewed journal publishes research that advances the engineering of agricultural, food, and biological systems. Submissions must include original data, analysis or design, or synthesis of existing information; research information for the improvement of education, design, construction, or manufacturing practice; or significant and convincing evidence that confirms and strengthens the findings of others or that revises ideas or challenges accepted theory.
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