Analysis of requirement of oil contaminated level for solidified parameters
LI Min1，2，WANG Chen1，XIE Shoubin3
(1. School of Civil Engineering and Transportation，Hebei University of Technology，Tianjin 300401，China；2. Hebei Research Center of Civil Engineering Technology，Tianjin 300401，China；3. Zhonghangtian Construction Engineering Co.，Ltd.，
Beijing 100071，China)
Abstract：Based on the problems existed in the complex environmental geotechnology caused by oil contaminated saline soil，lime and fly ash was chosen as solidified materials，triaxial shear strength and scanning electron microscope(SEM) experiments were carried out to analyze the requirement mechanism of solidified parameters to different oil contaminated level. Results indicated that：(1) Cohesion(c) of solidified soil was improved more remarkable than that of internal friction angle(φ). With lengthen of curing periods，soil deformation modulus and deviator stress was gradually increased，and the failure form was changed from strain hardening to strain softening. (2) Oil contamination had less effect on curing reaction as it was slight(contaminated level ≤4%)，and the suitable solidified parameters were lime of 6%+fly ash of 20%+curing period of 28 d. In addition，the c，φ were affected obviously by oil characteristics in the initial curing，and the problems of expansion and the slide action was caused by the increase of lime and fly ash content. (3) As regards oil contamination level of 4%–8%，shear strength was degraded by oil contamination，and the suitable solidified parameters were lime of 8%+fly ash of 25% +curing period of 28 d. There was dynamic variation among transition point of oil lubricity to viscosity，lime content and oil contaminated level in the initial curing. (4) For oil contamination level of 8%–12%，oil viscosity was decreased with the increasing of lime content，and then the extent and rate of pozzolanic reaction was delayed by the physical containment of oil. As an incomplete crystallization，strength was increased continually in later curing. Therefore，it suggested increasing the lime and fly ash content to solve the problem of oil obstruction on solidified material and of blocking on water migration as to heavily oil contaminated soil.
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2019, Vol. 38 
