长期冻融循环下固化铅锌镉复合重金属污染土抗剪强度及浸出特征研究

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Abstract In order to evaluate the shear strength and leaching characteristics of the solidified composite heavy metal contaminated soil after long-term freeze-thaw cycles (up to 90days (times)), triaxial compression test and toxicity characteristic leaching procedure test were carried out on the lead-zinc-cadmium composite heavy metal contaminated soil after solidification/stabilization with composite curing agent of cement, quicklime and fly ash. The results show that the angle of internal friction only increased significantly to 3 freeze-thaw cycles, and the increase rated was as high as 96.3%; while the overall trend of cohesion continued to decline by 30 freeze-thaw cycles, and there was no significant change afterwards, and the final decline rate reached 54.23%; the leaching concentration of Pb²⁺, Zn²⁺, Cd²⁺, and the EC value of the extract is proportional to the number of freeze-thaw cycles; the pH value of the extract decreases after long-term freeze-thaw cycles. And through scanning electron microscopy, we further explored the degradation mechanism of the shear strength and leaching characteristics of solidified contaminated soil under long-term freeze-thaw cycles. The results show that a large amount of delayed ettringite is formed in the solidified soil at the end of the freeze-thaw cycle, and its expansion during the formation process is the main reason for the loss of shear strength and the increase of heavy metal leaching concentration.

Key words： long-term freeze-thaw cycle composite heavy metal contaminated soil shear strength leaching characteristics degradation mechanism

Received: 20 December 2021

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X53

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	WANG yao
	YANG Zhong-ping
	ZHOU Yang
	CHANG Jia-zhuo
	LI Deng-hua
	LUO Jun

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WANG yao,YANG Zhong-ping,ZHOU Yang等. Shear strength and leaching characteristics of solidified lead-zinc-cadmium composite heavy metal contaminated soil under long-term freeze-thaw cycles[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(7): 3276-3284.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I7/3276

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