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Effects of Heat Softening on Initiation of Landslides
Xiong CX; Lu XB(鲁晓兵); Huang WD; Wang, CH; Xiong, CX (reprint author), Fuzhou Univ, Sch Environm & Resources, Fuzhou 350108, Peoples R China.
AbstractEffects of heat softening on the initiation of slide surface (shear banding) in clayey slopes during fast deformation were discussed. Controlling equations considering heat, pore pressure and mechanical movement were presented. By perturbation method, the instability condition of localized zone (i.e. criterion for initiation of shear banding) for thermal related soils, such as clayey slope, was obtained. It is shown that slide surface initiates once the thermal-softening effects overcome the strain-hardening effects whether it is adiabatic or not. Without strain hardening effects, strain rate hardening obviously plays a role in initiation of shear band. During initiating process, heat is trapped inside the shear band, which leads rapidly to a pore pressure increase and fast loss of strength. The localized shear strain is concentrated in a narrow zone with a width of several centimeters at most and increases fast. This zone forms the sliding surface. Temperature can increase more than 2 degrees C, pore pressure can increase 160% in about 0.1s inside this zone. These changes cause the fast decrease in friction-coefficient by about 36% over the initial value. That is how shear band initiated and developed in clayey slopes.
KeywordLandslide Thermo-effect Slide Surface Initiation
Subject AreaEnvironmental Sciences & Ecology
Indexed BySCI
WOS IDWOS:000345621100019
Funding OrganizationThis study was funded by the National Natural Science Foundation of China (Grant No. 11272314; No. 51239010), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20133514110004), and the Research Project of Chinese Ministry of Transport (Grant No. 201331849A130).
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorXiong, CX (reprint author), Fuzhou Univ, Sch Environm & Resources, Fuzhou 350108, Peoples R China.
Recommended Citation
GB/T 7714
Xiong CX,Lu XB,Huang WD,et al. Effects of Heat Softening on Initiation of Landslides[J]. JOURNAL OF MOUNTAIN SCIENCE,2014,11(6):1571-1578.
APA Xiong CX,鲁晓兵,Huang WD,Wang, CH,&Xiong, CX .(2014).Effects of Heat Softening on Initiation of Landslides.JOURNAL OF MOUNTAIN SCIENCE,11(6),1571-1578.
MLA Xiong CX,et al."Effects of Heat Softening on Initiation of Landslides".JOURNAL OF MOUNTAIN SCIENCE 11.6(2014):1571-1578.
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