Stability Analysis Of Jointed Rock Slope Based On Point Safety Factor Method

The stability of rock slope is an important problem in the prevention and control of geological hazards in China.Whether the slope is stable or not is a great potential safety hazard for the loss of national economic property and the safety of the people.China is a mountainous country,especially in the southwest mountainous areas,where the geological environment of rock slope is relatively complex and there are a large number of structural planes.The structure and development characteristics of rock and soil are important factors affecting the stability of rock slope.The traditional limit equilibrium method can't effectively simulate the three-dimensional structural characteristics of the slope,and can't t separate the relative stability of each part of the slope.Based on the shortcomings of the above methods,this paper uses the point safety factor method as the judgment method,uses the three-dimensional finite difference software,Flac3 D,discrete element software.3DEC and data visualization software,Tecplot,to analyze the slope stability,calculates the stress and strain of different slopes and the distribution of point safety factor,and finds out the difference between the two calculation methods.The main work is as follows:1.By reading the relevant literature,the current rock slope stability analysis method is summarized.Because this method can't perform local stability analysis on each point on the slope,the point safety factor method proposed by Yang Tao et al.The rationality of the method is determined by two-dimensional example.The unstable region calculated by the point safety factor method is basically consistent with the reference through-sliding surface area.The overall point safety factor value is similar to the safety factor calculated by the limit balance method.It can be considered that it is reasonable and feasible to use the point safety factor method to evaluate the stability of jointed rock slopes.2.The paper relies on the foundation slope of the high-speed railway line of the Yukun high-speed railway line as the engineering background.With the point safety factor method based on the displacement iso-surface and the point safety factor method based on the structural plane,the stability calculation results are compared and analyzed.There is a big difference in the stress-strain state of the slope body in the two calculation modes.The camber structure surface exacerbates the instability of the slope body.For the slope body which is not particularly large,the inclined structure surface is It is beneficial to the stability of the slope to a certain extent.It verifies the important influence of the existence of the structural plane on the stability of the slope.The point safety factor method can reasonably reflect the influence of the structure on the stability of the slope.3.Selecting the bridge base slope with typical characteristics,grouping the slope angle of the slope,the inclination angle and the spacing of the structural plane,and analyzing the different stress-strain states and point safety factors between different group slopes,it is found that The existence of structural planes has a relatively large influence on the distribution of potential unstable regions of slopes.For continuous rock simulations of jointed rock slopes with high slope angles and high structural angles,large errors may occur,while for inwardly inclined structural planes The use of continuous medium simulation for rock slopes is conservative.