咸水区水泥土桩劣化及改性对道路复合地基的影响

doi:10.6040/j.issn.1672-3961.0.2017.580

Abstract

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 FLAC^3D. 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

WANG Zhongxiao, CUI Xinzhuang, CUI Sheqiang, ZHANG Lei, CHE Huaqiao, SU Junwei. The influence of soil-cement pile deterioration and modification in salt-water area on road composite foundation[J].JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE), 2018, 48(4): 69-77.

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

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