The Research On Stability And Aseismicity Of Multistage High Slope Constituted By Loess In The Process Of Excavation

It is necessary to research the stability of typical slope engineering in the stage of excavation,this work can protect personnel property safety and optimize the construction methods,also it will improve the effective reference for similar projects.this paper based on a multistage loess high slope project in lanzhou, gansu province,deformation monitoring of excavation engineering of slope was carried out, also set up a corresponding numerical model of slope, in order to study the stability and seismic performance of slope in the process excavation.Main work include theoretical analysis and deformation monitoring as soon as comparison and analysis of numerical simulation,finally obtained the related conclusion.(1)After proceed deformation monitoring for more than a year on the multistage loess high slope in process of excavation, collected and sorted the data.Analyzed mainly the deformation in the direction of levels outward to the slope and vertical upward,reaching the deformation trend and relevant relations of the measuring points at all levels.(2)Set up support and not two numerical model under the condition of excavation by MIDAS/GTS,calculated and analyzed the shear strain,horizontal deformation,vertical deformation of two kinds of working condition in the process of excavation.Then contrast the stability of the two kinds of working conditions in the process of slope excavation, Relevant conclusions have good reference to actual construction of excavation.(3)By contrasting and analyzing the relevant conclusions of numerical simulation and the analysis results of deformation monitoring data, it was found that change rule and deformation relation sat of all levels in the direction of levels outward to the slope and vertical upward are basically identical.(4)Set up the seismic model of three typical stages in the process of excavation by MIDAS/GTS,at same time consider support and not two condition.Calculate and analysis of the deformation under the condition of earthquake,Focus on analyzing the characteristics of deformation of slope and the danger zone distribution form, the danger zone distribution form.Contrasted crosswise the stability of the slope in the process of excavation under the earthquake, The conclusions provide effective reference to similar projects in seismically active areas.(5)by contrasting analysis results of Seismic load conditions in fifth chapter and no earthquakes conditions in fourth chapter, Carried out the overall influence of support measures to improve vibration resistance when get the earthquake on the slope, also the deformation and instability of slope after the quake.finally put forward some Suggestions tothe Construction of similar projects in seismically active areas,it is useful to Understand safety of slope in project construction.The above conclusion can provide reference for similar engineering design and construction and technical support.