冻融循环下煤渣改良土细观结构演化研究

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Abstract Research purposes: In order to study the effect of freeze-thaw cycles on the micro-structure of cinder improved soil (CIS), CT scanning tests and triaxial tests of CIS under different freeze-thaw conditions were carried out, and the pore development laws and elastic modulus evolution laws of CIS under different freeze-thaw cycles, freezing temperature and initial moisture content were obtained. The development law of each area was analyzed through the zoning observation of the sample section. The relationship between meso-structure evolution and elastic modulus was established.
Research conclusions: (1) With the increase of freeze-thaw cycles, the area of high-density zones decreased gradually, the area of medium-density and low-density zones increased gradually, and the area of pore zone basically remained unchanged. The first five freeze-thaw cycles had a great influence on the structure of CIS. (2) With the decrease of freezing temperature, the area of high-density zones decreased slightly, and the area of medium-density and low-density zones increased slightly, but the change degree is not significant. The area of pore zone remained basically the same. The change of high-density, medium-density and low-density zones were more sensitive in the range of -5℃ ~-15℃. (3) With the increase of moisture content, the area of high-density zones decreased gradually, the area of medium-density and low-density zones increased, and the area of pore zone also increased to a certain extent, and the development of each zone showed an accelerated trend. Under the condition of single factor, the number of freeze-thaw cycles had the greatest influence on the sample, followed by the initial moisture content of the sample, and the freezing temperature had the least influence. (4) The damage evolution model established according to the freeze-thaw damage factor had a certain accuracy, and can better reflect the relationship between meso-structure evolution and elastic modulus under freeze-thaw, which can provide a reference for the prevention and control of subgrade frost damage in cold region.

Key words： subgrade engineering cinder improved soil freeze-thaw cycles meso-structure CT scanning

Received: 30 June 2021

PACS:

U419.92

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	REN Kun
	WANG Haitao

Cite this article:

REN Kun,WANG Haitao. Research on the Meso-structure Evolution of Cinder Improved Soil under Freeze-thaw Cycles[J]. Journal of Railway Engineering Society, 2022, 39(7): 12-17.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I7/12

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