Effects of heat softening on initiation of landsli

Authors: Chuanxiang Xiong Xiaobing Lu Weida Huang Chenghua Wang

Publish Date: 2014/11/29

Volume: 11, Issue: 6, Pages: 1571-1578

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Abstract

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 ie 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 thermalsoftening effects overcome the strainhardening 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 01s inside this zone These changes cause the fast decrease in frictioncoefficient by about 36 over the initial value That is how shear band initiated and developed in clayey slopes

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