›› 2016, Vol. 37 ›› Issue (S1): 215-225.doi: 10.16285/j.rsm.2016.S1.028

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental study of stress-strain properties of lead-contaminated soils treated by magnesium phosphate cement

ZHANG Ting-ting, LI Jiang-shan, WANG Ping, LI Zhen-ze   

  1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China
  • Received:2015-11-10 Online:2016-06-16 Published:2018-06-09
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51479194), the Cross-disciplinary Collaborative Teams Program for Science, Technology and Innovation, the Chinese Academy of Sciences (Y426011C01), the Wuhan High and New Technology Achievements Transformation and Industrialization Project (2013060803010403) and the State Key Laboratory of Geomechanics and Geotechnical Engineering funding issues (Z015003).

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Abstract: Magnesium phosphate cement(MPC) is used to stabilize/solidify lead-contaminated soils. Unconfined compressive strength tests are conducted to investigate the variation of stress-strain properties of MPC treated lead-contaminated soils along with MPC dosage, curing time, water content and lead concentration. The results show that stress-strain curves of lead-contaminated soils can be divided into three stages: compaction stage, elastic stage and destruction stage. The qu, and E50 increase significantly with MPC dosage and curing time, while the εf change oppositely. There are threshold values for water content and lead concentration in terms of its influence on qu and E50, where qu is the threshold value of 0.45 and E50 is the threshold value of 500 mg/kg. The qu, and E50 increase with the lead concentration and water content before they reach the threshold value. The qu decreased as power function with the increase of εf. E50 increase linearly with qu while decrease monomially with εf, where below the critical value.

Key words: solidification/stabilization(S/S), lead contaminated soil, unconfined compressive strength, deformation modulus, failure strain

CLC Number: 

  • TU 473.1
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