JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2018, Vol. 48 ›› Issue (4): 69-77.doi: 10.6040/j.issn.1672-3961.0.2017.580

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The influence of soil-cement pile deterioration and modification in salt-water area on road composite foundation

WANG Zhongxiao1, CUI Xinzhuang1,2*, CUI Sheqiang1, ZHANG Lei1, CHE Huaqiao1, SU Junwei1   

  1. 1. School of Civil Engineering, Shandong University, Jinan 250061, Shandong, China;
    2. Shenzhen Research Institute, Shandong University, Shenzhen 518057, Guangdong, China
  • Received:2017-11-22 Online:2018-08-20 Published:2017-11-22

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Abstract: In order to reveal the influence of soil-cement pile deterioration and modification in salt-water area on road composite foundation, the physical and chemical properties of soil and water in the Yellow River Delta were analyzed through laboratory experiments, and the mechanical properties of salty soil-cement were studied. Based on Mohr-Coulomb constitutive model and strength reduction method, the influence of soil-cement pile deterioration and modification on the settlement and load-bearing properties of composite foundation were stimulated by FLAC3D. Research showed that, groundwater was basically saltwater with a salinity greater than 5 g/L and the salt was mainly chloride. The corrosion of salt caused deterioration of soil-cement with reduced strength. The deterioration of soil-cement pile increased the settlement of composite foundation and reduced the bearing capacity of pile. It could be effectively improved the bearing capacity of pile and reduced the settlement of composite foundation by using slag powder to modify soil-cement pile. Therefore, in the design of composite foundation, fully considering the deterioration effect of soil-cement pile is the key to ensure that the subgrade has sufficient strength and stability throughout its life cycle.

Key words: salt-water area, material modification, composite foundation, numeric simulation, soil-cement pile deterioration, road engineering

CLC Number: 

  • TU472.3
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