Upper-bound Limit Analysis Of Stability And Reinforcement Of Single And Two Stage Slope

Seismic action is very important in slope engineering.So far,many studies have analyzed the stability of single-stage slope affected by earthquake,but the stability analysis of multi-stage slope is rare,which is affected by earthquake especially the complex seismic waves.With the development of high slope engineering,the graded slope is becoming more and more common.As the foundation of multi-stage slope,the stability analysis of the two-stage slope has been widely studied.Based on the upper-bound theorem of limit analysis,this paper has introduced the seismic action to analyze the single-stage slope and the two-stage slope,and comprehensively evaluates the stability of the two-stage slope considering the pile load and pile-anchor support of the actual project.The main research contents are as follows:Considering that rock slope is widely used in slope engineering.Hoek-Brown criterion,which is one of the nonlinear failure criterion,is adopted to analyze single-stage slope failure mechanism under the action of quasi-static method.Runge-kutta numerical method is used to solve the sliding surface shape,and the expression of slope stability coefficient is derived according to the upper bound theorem of limit analysis.The influence of hoek-Brown failure criterion parameters on slope stability coefficient and slope failure area is studied,and the influence of seismic force coefficient on slope stability coefficient is analyzed.For the two-stage slope,considering the homogeneous isotropic and heterogeneous soil materials,the quasi-dynamic method is used to analyze the stability of the slope.The mass function and velocity function of the slope are derived by using the relationship between the horizontal micro element and geometry,and the analytical formula of the seismic inertia force power of the secondary slope under the action of the quasi-dynamic method is obtained.The expression of internal energy dissipation of heterogeneous slope is analyzed,and the energy consumption balance is established by upper bound theorem of limit analysis method.Finally,the expression of stability coefficient of slope under pseudo-dynamic method is obtained.The influence of shape and depth coefficient and internal friction Angle on the stability coefficient of homogeneous slope is analyzed,and the influence of heterogeneous parameters on the stability coefficient of slope is also analyzedIn view of the support measures of the secondary slope,the single anti-slide pile model and pile-anchor combined support model are introduced to analyze,and the pile load affected by earthquake effect is added to the slope top according to the actual situation of the project to carry out comprehensive calculation.Based on the upper bound theorem of limit analysis method,considering the internal energy dissipation rate of anti-slide pile and the power of anchor force,the upper bound solution of resistance required by single anti-slide pile and pile-anchor combined support is derived and the influence of parameters of pseudo dynamic force and pile load on resistance coefficient and anchoring coefficient is analyzed.Based on Shenzhen High slope project,the most unfavorable slope surfaces in three practical projects are calculated and analyzed theoretically,and the results of theoretical calculation are verified by numerical simulation using finite element software.Finally,the anchor and anti-slide pile are optimized for supporting slope,and the optimization scheme is given.There are 82 figures,20 tables and 96 references.