SEM Microstructure and Chemical Foamed-Soil Modification Tests for Swelling Red Strata in Subway Shield Tunneling Engineering

A difficult problem for tunneling in red strata soils in Guangzhou subway is that the mud cakes are easily formed in the cut face of shield machine. It has frequently induced ground failures and collapse accidents. The microstructures of red soil are studied using SEM (scanning electron microscope). The SEM tests disclose the important microstructures of red strata minerals such as micro-lamina tactoid, petal-shape and micro-porosity. The mechanism of water-induced red strata swelling damage and high-viscosity characteristics are then investigated. The disclosed microstructure and micro-porous properties provide the evidence for understanding the mechanical behavior of Guangzhou swelling red strata soils. Furthermore, the chemical foamed-soil modification tests for red soils are presented. Experiments on foam modified red soils disclose the relationship between permeability and fluidity for foamed red soils and sandy soils in subway engineering. This research is helpful for applying foamed soil to stabilize the tunneling face and to prevent ground seepage damage in shield tunneling construction.

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 20-26
  • Monograph Title: Recent Advancement in Soil Behavior, In Situ Test Methods, Pile Foundations and Tunneling: Selected Papers From the 2009 GeoHunan International Conference

Subject/Index Terms

Filing Info

  • Accession Number: 01140966
  • Record Type: Publication
  • ISBN: 9780784410448
  • Files: TRIS
  • Created Date: Sep 15 2009 3:47PM