石油烃污染土原位修复技术众多，但不同修复技术对石油烃污染粉质砂土工程特性影响的差异性尚不清楚。针对热脱附修复、化学氧化修复和热脱附耦合化学氧化修复3种不同修复技术修复完成后的石油烃污染土，分别开展了相关室内工程特性试验，对比分析了不同修复技术对石油烃污染粉质砂土工程特性的影响并作定量评价。试验结果表明：经热脱附修复完成后的土体整体工程特性显著提高，具体体现在含水率降低、平均孔径增大、抗剪强度和渗透性增加以及压缩性降低；化学氧化修复后土体的工程特性则相对变差，热脱附耦合化学氧化修复对土体工程特性的影响介于两者之间。进一步分析发现，污染土修复前后各力学指标与其残余石油烃浓度以及含水率存在较好的相关关系，不受修复技术的影响。在此基础上，提出了不同修复技术下污染土各力学指标的统一估算方法。该研究成果为石油烃污染场地在不同修复技术下的安全再利用提供设计指导。Thereare many in-situ remediation technologies for the total petroleum hydrocarbon(TPH) contaminated soils

investigation ofpotential effects of three remediation technologies on the engineeringproperties of petroleum hydrocarbon-contaminated silty sand is howeverlimited. Laboratory tests have been conducted to examine variations of physicaland mechanical properties of the contaminated soils before and afterremediation. The test results show that the engineering properties of thecontaminated soils have been largely improved after a thermal desorption remediation

with water content and compressibility decreasing as well as average pore sizeand shear strength and permeability increasing. After chemical oxidation remediation

the engineering characteristics of the soil become relatively poor

and theimpact of thermal desorption coupled with chemical oxidation on the engineeringcharacteristics of the soil is between the two. It is also found that themechanical properties of the contaminated soils are well correlated with itsconcentration of residual petroleum hydrocarbon and water content

and it isnot affected by remediation technologies. Based on the test results

normalizedequations are proposed to estimate the mechanical properties of thecontaminated soils before and after remediation. The findings are expected tobe useful to choose a reasonable remediation technology as well as foundationdesign.