Rock and Soil Mechanics ›› 2023, Vol. 44 ›› Issue (10): 2833-2842.doi: 10.16285/j.rsm.2023.0846

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental study on the influence of different remediation technologies on the engineering properties of petroleum hydrocarbon-contaminated silty sand

LI Yu-ping1, 2, FAN Bao-yun1, DONG Kang-ran1, 3, WAN Jin-zhong3, AI Ying-bo1, WANG Bao-tian1, 2   

  1. 1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, Jiangsu 210024, China; 2. Engineering Research Center of Dredging Technology, Ministry of Education, Hohai University, Changzhou, Jiangsu 213022, China; 3. Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing, Jiangsu 210042, China
  • Received:2023-06-17 Accepted:2023-08-25 Online:2023-10-13 Published:2023-10-16
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (42277134), the Fundamental Research Funds for the Central Universities of China (B230201054) and the National Program on Key Basic Research Project of China (2019YFC1805700).

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Abstract:

There are many in-situ remediation technologies for the total petroleum hydrocarbon (TPH) contaminated soils, investigation of potential effects of three remediation technologies on the engineering properties of petroleum hydrocarbon-contaminated silty sand is however limited. Laboratory tests have been conducted to examine variations of physical and mechanical properties of the contaminated soils before and after remediation. The test results show that the engineering properties of the contaminated soils have been largely improved after a thermal desorption remediation, with water content and compressibility decreasing as well as average pore size and shear strength and permeability increasing. After chemical oxidation remediation, the engineering characteristics of the soil become relatively poor, and the impact of thermal desorption coupled with chemical oxidation on the engineering characteristics of the soil is between the two. It is also found that the mechanical properties of the contaminated soils are well correlated with its concentration of residual petroleum hydrocarbon and water content, and it is not affected by remediation technologies. Based on the test results, normalized equations are proposed to estimate the mechanical properties of the contaminated soils before and after remediation. The findings are expected to be useful to choose a reasonable remediation technology as well as foundation design.

Key words: contaminated soils, petroleum hydrocarbon C6-C9, remediation technology, engineering properties

CLC Number: 

  • X 53
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