新疆北部重塑性黄土的力学特性规律及微观机制试验研究

doi:10.11896/cldb.23090060

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Abstract A water conveyance open channel project in Xinjiang passes through a large area of collapsible loess area. Land sliding often occurs at the channel since its operation. In order to deeply analyze its failure mechanism, the indoor direct shear, compression, penetration and SEM electron microscope scanning tests were carried out to analyze its mechanical characteristics and micro-physical mechanism from a macro-micro perspective. (i) Direct shear test result showes that:with the increase of water content, the cohesion increases first and then decreases, and gets the peak value when the water content is near the optimal water content, and the internal friction angle decreases. With the increase of dry density, the internal friction angle and cohesion increase. Through microscopic experimental analysis, with the increase of dry density, the skeleton particles are closely packed, the number of particles decreases, the area of each particle increases, the roundness of each particle decreases, and the orientation of these particles becomes worse. The roundness and orientation probability entropy of particles are the main factors affecting the cohesion and internal friction angle respectively. (ii) Compression test result showes that:with the increase of water content, the yield stress decreases linearly, while the plastic compression parameters and rebound index increase linearly. With the increase of dry density, the yield stress increases linearly, and the plastic compression parameters and rebound index decrease linearly. Through microscopic test analysis, with the increase of consolidation pressure, the particle aggregates with weak cementation ability are crushed to form new particle aggregates, the soil skeleton is reorganized to form a secondary structure dominated by flocculation, the number of particles reduces, the circularity increases, and the orientation is enhanced. the particle orientation probability entropy has the greatest influence on the compressibility of loess. (iii) Percolation test result showes that:the saturated permeability coefficient decreases with the increase of dry density. Through microscopic test analysis, with the increase of dry density, the number of overhead pores in the microstructure of the permeable loess decreases, the mosaic pores and intergranular pores increase, and the pore connectivity becomes worse. The number, area ratio, roundness, abundance and large pore area ratio of pores have a significant positive correlation with the saturated permeability coefficient, and the pore area ratio has the highest correlation among them.

Key words： remolded loess shear strength compression deformation permeability microscopic mechanism

Published: 10 February 2025 Online: 2025-02-05

CLC number:

TU443

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	ZHANG Lingkai
	DING Xusheng
	FAN Peipei

Cite this article:

ZHANG Lingkai,DING Xusheng,FAN Peipei. Experimental Study on Mechanical Properties and Microscopic Mechanism of Remolded Loess in Northern Xinjiang[J]. Materials Reports, 2025, 39(3): 23090060-10.

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http://www.mater-rep.com/EN/10.11896/cldb.23090060 OR http://www.mater-rep.com/EN/Y2025/V39/I3/23090060

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