Criterion And Displacement Analysis Of Highway Rock Slope

This article is mainly based on the bedding rock slope with weak structural plane as the research object.At present,the main problems in the stability analysis of rock slopes are the diversity and uncertainty of rock slope instability criteria,which makes the rationality of the calculated stability coefficient questioned,especially in the analysis of strength reduction by finite element method.When the stability of soft rock slopes is lacking,the applicability of relevant instability criteria is lacking;the complexity and uncertainty of factors affecting slope stability and the insignificance of discrimination of sensitive factors;the failure of rock slopes is A very complicated,highly nonlinear and divergent problem,the displacement of which is uncertain and accidental,and the criterion of slope instability is very limited.Therefore,this paper uses ABAQUS numerical analysis software,combined with the local element reduction method of the finite element strength reduction method for rock slope instability criteria with weak structural planes,sensitivity factors for rock slope stability,and periodic displacement of rock slope monitoring.The research is carried out in three aspects with the mutation criterion.The main contents and conclusions are as follows:(1)Research on the yield criterion of geotechnical materials and the inference of the conversion relationship between the criteria.It is recommended to use the inscribed circle DP4criterion(association criterion)and the MC matching criterion DP5(non-association criterion)when analyzing the slope plane problem In the 3D analysis of the slope,the MC criterion isometric circle DP3 criterion is used.(2)In the stability analysis of the bedding rock slope with weak structural plane,through the rock slope calculation example,compare the three types of commonly used instability criterion,improved instability criterion and stress mutation criterion,and obtain each stability coefficient To find the most suitable instability criterion.(1)In the numerical analysis,the stability coefficient obtained by the conventional slope characteristic point mutation criterion is too small,and the ratio mutation curve of displacement increment and reduction coefficient increment ratio is proposed to determine the stability coefficient of rock slope.The catastrophe criterion is very close to the plastic zone penetration criterion and the calculation non-convergence criterion,and it is more reasonable.At the same time,when this improved criterion is adopted,the stability point can be obtained within the range of the slope sliding body.(2)The stability coefficient of the rock slope is analyzed by the rock slope stress mutation criterion and the plastic zone penetration rate criterion.The rock slope stability coefficients obtained by the two criteria are the same,indicating that the rock slope has a sudden stress change during the instability Before the displacement mutation.(3)Finally,the relationship between the stability coefficients of a rock slope under different working conditions is compared,and the impact of rainfall + water level changes on the stability of the rock slope is analyzed to provide a theoretical reference for similar rock slopes.(3)In combination with the reconstruction and expansion of the G316 Fuzhou Zixi Huashanjie to Nancheng Huangshidu section of the highway,the 7 factors included in the internal parameters,geometry,and external load of the rock slope are used as stability-sensitive analysis objects.The sensitivity of the evaluation index factors is determined by the finite element strength reduction method and the single factor analysis method,and the relative importance relationship between the two factors is obtained.The analytic hierarchy process is used to combine qualitative and quantitative analysis to determine the weight of each factor reasonably.Based on the relationship between the original data of rock slopes,the entropy method is used to determine the variability and weight of each factor.Finally,the weight of each factor is weighted by the subjective and objective combination weighting method to determine the most sensitive to the slope stability.Factors in order to provide a reference for slope management and optimization design.(4)Aiming at the uncertainty and randomness of the actual slope monitoring displacement under the disturbance of external factors(water level rise and fall,rainfall intensity,etc.),a comprehensive criterion combining slope analysis with periodic analysis and catastrophe theory is proposed.Based on this,periodic analysis and displacement mutation criterion analysis of the monitoring displacements of the case of the Qiangtang landslide project are combined with the combination of the displacement mutation magnification criterion to comprehensively determine the stable state and stability trend of the slope.The feasibility of the criterion method in this paper is demonstrated.Sex.Finally,the combined weighting method is used to analyze the weighting analysis of the stability factors of the engineering case,which provides a reference for further governance and optimization design.