Effect of Coarse Grain Content on Shear Strength of Mixed Soil in Western Sichuan

CUI Kai; SU Lei

doi:10.3969/j.issn.0258-2724.20180826

Volume 54 Issue 4

Jul. 2019

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Journal of Southwest Jiaotong University > 2019 > 54(4): 778-785.

CUI Kai, SU Lei. Effect of Coarse Grain Content on Shear Strength of Mixed Soil in Western Sichuan[J]. Journal of Southwest Jiaotong University, 2019, 54(4): 778-785. doi: 10.3969/j.issn.0258-2724.20180826

Citation:

CUI Kai, SU Lei. Effect of Coarse Grain Content on Shear Strength of Mixed Soil in Western Sichuan[J]. Journal of Southwest Jiaotong University, 2019, 54(4): 778-785. doi: 10.3969/j.issn.0258-2724.20180826

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Effect of Coarse Grain Content on Shear Strength of Mixed Soil in Western Sichuan

doi: 10.3969/j.issn.0258-2724.20180826

CUI Kai^1
,,
SU Lei²

Received Date: 23 Sep 2018
Rev Recd Date: 24 Nov 2018

Available Online: 21 Dec 2018

Publish Date: 01 Aug 2019

Abstract

Abstract

Mixed soil is widely distributed in the west of Sichuan, and the stability of the highway subgrade made up of mixed soil in mountainous areas is an issue needing urgent attention and research in engineering practices. Considering that mixed soil shear strength is affected greatly by the content of coarse particles, the natural mixed soil used for subgrade in mountain areas of Western Sichuan was chosen and used in small and large direct shear tests to systematically study the influence of the coarse grain content on the shear stress-displacement curve and internal friction angle of the mixed soil. Experimental results show that the shear strength of mixed soils changes significantly with the coarse grain content, and presents different variation tendencies in different coarse grain content ranges. When the coarse grain content increases from 0 to 30%, the internal friction angle grows slowly. With the coarse grain content increasing from 30% to 60%, the growth rate of the internal friction angle becomes faster; and then it slows down again beyond the content of 60%. Therefore, there are two threshold values formed, which can be explained from skeleton theory. Differences in the main influencing factors of shear strength in different ranges are finally analyzed from macro and micro aspects, which can provide the reference value and theoretical basis for mixed soil structure stability evaluation.
- mixed soil,
- coarse particle content,
- large direct shear test,
- internal friction angle,
- threshold value

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References(36)

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Effect of Coarse Grain Content on Shear Strength of Mixed Soil in Western Sichuan

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