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Effects of Heat Softening on Initiation of Landslides

Effects of Heat Softening on Initiation of Landslides
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摘要 Effects 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?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.
出处 《Journal of Mountain Science》 SCIE CSCD 2014年第6期1571-1578,共8页 山地科学学报(英文)
基金 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) the Research Project of Chinese Ministry of Transport (Grant No. 201331849A130)
关键词 LANDSLIDE Thermo-effect Slide surface INITIATION 热软化 引发 热影响 孔隙水压力 应变集中 滑坡 硬化效应 剪切带
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