NaCl侵蚀环境下水泥固化铅污染土强度及微观特性试验研究

doi:10.13722/j.cnki.jrme.2014.0929

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Abstract Under the groundwater environment that is rich in sulfate and chloride ions，solidified/stabilized heavy metal contaminated soils may suffer secondary pollution and resulting in the deterioration of solidification effectiveness. Thus，the strength and microstructure characteristics of cement solidified/stabilized lead contaminated soils under the secondary pollution by sodium chloride solution were studied. A systemic experiment program was performed on the cement solidified/stabilized Pb2+ contaminated soil. Test results show that the unconfined compressive strength of solidified soils decreased and compressibility increased with the increased in concentration of sodium chloride solution. The strength reached minimum and compressibility reached maximum when specimens soaked for 7 days. After soaking for more than 7 days，with the immersion time increased，the strength enhanced and the compressibility decreased. The results of triaxial compression test show that the stress-strain curves of solidified soils can be divided into three different sections：elastic deformation stage，plastic yielding stage and failure stage. Scanning electron microscopy(SEM) results indicate that erosion of sodium chloride solution leaded to porosity increased and loose structure of the solidified soils. Particles of the sample that soaked 28 and 90 days arranged more compactly and steadily than that soaked 7 days.

Key words： soil mechanics solidification/stabilization method sodium chloride erosion lead contaminated soil strength microstructure

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	ZHA Fusheng
	LIU Jingjing
	HAO Ailing
	CUI Kerui

Cite this article:

ZHA Fusheng,LIU Jingjing,HAO Ailing, et al. EXPERIMENTAL STUDY OF STRENGTH AND MICROSTRUCTURE CHARACTERISTICS OF CEMENT SOLIDIFIED LEAD CONTAMINATED SOIL ERODED BY SODIUM CHLORIDE SOLUTION[J]. , 2015, 34(S2): 4325-4332.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.0929 OR https://rockmech.whrsm.ac.cn/EN/Y2015/V34/IS2/4325

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