Creep Failure Of Sandstone And Monitoring Of Landslide Process And Theoretical Models

Landslide is an important geological hazard that affects people's production and life.Its induction mechanism is directly related to the creep process of rock mass.The complete process of landslide includes two processes: landslide sliding(fast instability or slow sliding)and post sliding stabilization.However,in the actual engineering,the monitoring of landslides pays more attention to the process leading to landslides,and the monitoring data and results of the post sliding stability process are few,which lacks a complete understanding and description.Based on this,this paper uses sandstone creep failure experiments and on-site monitoring of landslides,and combines the two results to characterize landslides and their stabilization processes,and develops two time-dependent processes for rock mass creep instability and damage and post-slide stability.Describe the creep theory model.The sandstone creep failure process was systematically tested and studied..Through continuous loading and grading loading tests,the peak sand strength and long-term strength of the test sandstone were tested and statistic,and the loading stress level of the sandstone creep failure test was determined accordingly.Through experiments,the uniaxial compressive creep failure process of sandstone under different loading levels is comparatively analyzed,which indicates that the creep failure of sandstone will undergo a typical three-stage evolution.Combining the calculation of strain rate and strain acceleration evolution time history,a detailed analysis of this process is carried out,which shows the critical power law singularity characteristic of sandstone failure,whose singularity index is about-1.On-site monitoring of two landslide processes in Sichuan Province shows that the stability processes of different regions of the same landslide are similar while showing differences.That is to say,there are two phases of rapid slope inclination development and stability in different areas of the slope.At the end of the rapid slope inclination,the rate of inclination change approaches zero,and then enters the stable phase.Theoretical models of creep failure process,actual landslide and stability process ofsandstone were carried out.The unsteady seven-element model combining ordinary elements and non-linear elements is used to describe the three-stage evolution process.The model results and experimental data are studied.Based on the comparison between the monitoring data and the model results,it is shown that the unsteady seven-element model can better describe the stability process after sliding.According to the comparative analysis of landslide monitoring data and sandstone creep failure test results and theoretical model descriptions,it shows that the landslide and post-slide stability process is similar to the creep development process.