不同含盐量的石灰粉煤灰固化石油污染土抗剪性能试验研究

Experimental research on shear strength performance of lime-fly ash solidified petroleum-contaminated soil with different salt contents

为研究石油污染土的剪切特性,以不同含盐量的固化石油污染滨海盐渍土为研究对象,对石灰、粉煤灰稳定碎石固化石油污染土进行力学强度性能试验与微观分析。研究结果表明:随含盐量的增大,石灰粉煤灰固化石油污染土(简称污染土)的黏聚力和内摩擦角均先增大后减小;含盐量相同,污染土的黏聚力和内摩擦角均随石灰、粉煤灰质量分数的增大而先增大后减小,随石油质量分数的增大而减小;含盐量为1%,石油、粉煤灰、石灰质量分数分别为4%、20%、10%时,污染土的黏聚力和内摩擦角最大;污染土的应力-应变曲线在不同石灰、粉煤灰、石油质量分数下均先增大后减小并趋于稳定;不同含盐量下,污染土的微观结构特征和宏观土样抗剪强度参数的变化规律一致。

To study the shear characteristics of petroleum-contaminated soil,using coastal saline soil with different salt contents as the research object,mechanical strength performance tests and microscopic analysis are conducted on stone-stabilized petroleum-contaminated soil with lime and fly ash.The research results indicate that with increasing salt content,the cohesion and internal friction angle of lime-fly ash stabilized petroleum-contaminated soil(referred to as contaminated soil)first increase and then decrease.At the same salt content,the cohesion and internal friction angle of contaminated soil first increase and then decrease with increasing mass fractions of lime and fly ash,while decreasing with increasing oil mass fraction.As the salt content is 1%with oil,fly ash,and lime mass fractions of 4%,20%,and 10%respectively,the cohesion and internal friction angle of contaminated soil are maximized.The stress-strain curve of contaminated soil increases and then decreases and stabilizes under different lime,fly ash,and oil mass fractions.The microstructural characteristics of contaminated soil under different salt contents are consistent with the variation of macroscopic shear strength parameters.