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Study on the erodibility of reconstituted cohesive and non-cohesive soil mixtures

1，2 2 3 3
GAO Xiaojing ，WANG Qiusheng ，LI Yong ，ZOU Fulin
（1. Bridge and Tunnel Research Center，Research Institute of Highway Ministry of Transport，Beijing 100088，China；
2. College of Architecture and Civil Engineering，Beijing University of Technology，Beijing 100124，China；
3. China Railway 11 Bureau Group Co.，LTD.，Wuhan 430061，China）

Abstract：The erodibility of cohesive and non-cohesive soil mixtures is different from that of cohesive soils
and non-cohesive soils. In this paper，erosion tests were conducted to investigate the erodibility of three dif⁃
ferent non-cohesive soil and silty clay mixtures using an erosion function apparatus. The variations of mix⁃
tures’ erosion rate and critical shear stress were analyzed according to the experimental data. The critical
mud content of the three mixtures were obtained by analyzing the data of erosion rate and critical shear
stress. Erosion experiments have clearly demonstrated that the erosion characteristics of mixtures can change
dramatically when the mud content changes. Considering the variation of mixture erosion behavior，the con⁃
cept of degree of cohesive erosion behavior were proposed for cohesive and non-cohesive soil mixtures，
which can be used to estimate if the mixture exhibits cohesive erosion behavior. A formula was developed
for the degree of cohesive erosion behavior for mixtures. The formula was expressed as a function of the
grain size of non-cohesive coarse particles and cohesive soil，and clay content. The final form of the devel⁃
oped formula was tested using the experimental data from the present study and the literature.
Keywords： erosion； cohesive and non-cohesive soil mixture； critical shear stress； critical mud content；
clay content；degree of cohesive erosion behavior

（责任编辑：耿庆斋）

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