Simulation analysis of the stability of permafrost-related slope
Climate change has altered the hydrothermal regime and physical characteristics of the active layer,reducing the stability of slopes.Currently,the stability analysis of permafrost slopes is mostly based on the limit equilibrium method.However,this method is difficult to analyze the stability of slopes under the coupled effects of the moisture field,temperature field,stress field,displacement field of the active layer.Therefore,this article integrates the Mohr-Coulomb criterion into the coupled thermo-hydro-mechanical model of unsaturated permafrost,establishes a coupled thermo-hydro-mechanical model of permafrost slopes(THM)to quantitatively analyze the impact of extreme high temperatures in summer on the stability of permafrost slopes.To validate the effectiveness of the model,a landslide in the permafrost region of the eastern Qinghai-Xizang Plateau was selected as the research object.The stability was calculated by constructing both the limit equilibrium model and the THM model,and the relationship between the simulation results and the field observation data were compared and analyzed.The research results show that the simulation results of the THM model are consistent with the calculation results of the traditional limit equilibrium method,and the location of the sliding surface,displacement magnitude,and final shape obtained from the numerical simulation are consistent with the field measurement data.Under extreme high temperature conditions in summer,when the active layer of permafrost melts to a depth of 1.45 m,the slope will become unstable along the melting front,and the sliding surface is parallel to the slope surface.The research results have a certain reference value for understanding the processes of slope collapse and thaw slumping in various engineering projects in cold regions.
NETL
NSTL
万方数据
维普
