EICP加固砂土的强度及应力-应变关系研究

doi:10.11896/cldb.24070113

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Abstract It is inevitable to strengthen the sandy soil in the construction of infrastructure on desertified land. The use of the Enzyme-induced carbonate precipitation (EICP) technique, an environmentally friendly method with less carbon emissions and soil and water pollution, can effectively improve the sandy soil’s engineering properties. In this work, the effects of various factors, including relative density, cementation solution concentration, and enzyme- cement ratios, on the strength of EICP-reinforced sandy soil were investigated through unconfined compressive strength tests. The findings indicate that the strength of EICP-reinforced sandy soil is influenced by both soil sample density and calcium carbonate content. For a given density, the strength of the reinforced soil shows a high positive correlation with calcium carbonate content. An optimal parameter combination is recommended to be a relative density of 0. 7, an enzyme-cement ratio of 1∶1, and a cementation solution concentration of 1 mol/L. Combined macroscopic test results with SEM and Micro-CT tests, it is revealed that the increase in peak stress of the reinforced soil is primarily due to the bonding, bridging and pore throat-blocking effects of calcium carbonate, while the increase in residual stress is attributed to the encapsulating effect. Calcium carbonate tends to divide larger pores into several smaller ones. Through the analyzing to the stress-strain curve of EICP-reinforced sandy soil, a damage evolution model was established based on the damage mechanics system, which aligns with the strain-softening characteristics of the reinforced soil. The fitting results indicate that this model can accurately predict the stress-strain relationship of EICP-reinforced sandy soil.

Key words： EICP soil improvement scanning electron microscopy CT damage model

Published: Online: 2025-05-29

CLC number:

TU411

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	Articles by authors
	WANG Jianye
	LI Xiao
	PENG Liyun
	WANG Dongyong

Cite this article:

WANG Jianye,LI Xiao,PENG Liyun, et al. Study on the Strength and Stress-Strain Relationship of EICP-Reinforced Sandy Soil[J]. Materials Reports, 2025, 39(11): 24070113-9.

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https://www.mater-rep.com/EN/10.11896/cldb.24070113 OR https://www.mater-rep.com/EN/Y2025/V39/I11/24070113

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