Geomechanics and Engineering

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A novel laboratory method for measuring the hydraulic conductivity of dredged slurry with high water contents

  • Cong Mou (Institute of Geotechnical Engineering, Transportation College, Southeast University) ;
  • Jian-wen Ding (Institute of Geotechnical Engineering, Transportation College, Southeast University) ;
  • Jian-hua Wang (Institute of Geotechnical Engineering, Transportation College, Southeast University) ;
  • Xing Wan (Institute of Geotechnical Engineering, Transportation College, Southeast University)
  • Received : 2022.09.15
  • Accepted : 2023.03.14
  • Published : 2023.05.10
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Abstract

Accurately measuring the hydraulic conductivity of dredged slurry (HCODS) is a difficult task and usually requires highly developed experimental techniques. To resolve such problem, this paper presents a novel laboratory method, where a double drainage sedimentation test (DDST) is proposed to generate a downward seepage after the end of primary consolidation (EOP). Based on the established stress equilibrium equations, it is figured out that the determination of local hydraulic gradients requires the effective stress distribution to be measured. Accordingly, an additional single drainage sedimentation test (SDST) with the same initial water content is performed in the novel laboratory method, which can be utilized to establish the relationship between effective stress and water content for investigated slurry. Thus, HCODS can be determined via a pair of SDST and DDST, with the water contents after the EOP measured. The corresponding calculation procedure is given in details. With a simply-designed settling column, the hydraulic conductivity tests were performed on three types of dredged slurry. The results demonstrated the effectiveness of the novel laboratory method in measuring HCODS.

Keywords

Acknowledgement

The research described in this paper was financially supported by the National Natural Science Foundation of China (Grant numbers 41977243, 52278334, and 51978159) and the International Postdoctoral Exchange Fellowship Program from China Postdoctoral Council (Grant number PC2021016). The authors would like to express appreciation to the reviewers for their valuable comments and suggestions that helped to improve the quality of the paper.

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