Advances in slope stability study on Permafrost area of Qinghai-Tibet Platean

Instability of natural and artificial slope for Permafrost area of Qinghai-Tibet Plateau is a kind of geological disaster phenomenon along with Qinghai-Tibet construction and operation.According to landslide environment,landslide of permafrost region will be divided into landslide of freezing soil and thawing soil,thaw slumping is representative thawing soil landslide.Taking thaw slumping as example,landslides mechanism of lubrication effect on sluggish water is put forward.Through similar model experiment,it is observed that deformation vertical to slope surface is composed of deformation of partially thaw settlement and frost heave.Frost heave deformation is not very obvious.Numerical simulation model of temperature field,deformation field has been built up.Deformation regulation of different depth in the course of freezing-thawing recycle is analyzed.It is observed that deformation mainly exists in shallow depth.Applying effective stress principle has derived safety factor unity formula.On this condition,stability analysis diagram of infinite slope of different slope angle,different water content condition has been drawn.As a result,two kinds of different evaluation methods of permafrost slope stability will be established.Finally,during the course of studying the topic and research direction have been pointed out.