Comprehensive Analysis Of Deformation And Monitor Of High Slope With The Form Of L In Collapsible Loess Area

With the advancement of the national economic development strategy,during the construction of the western and northern regions of my country,we faced many problems of loess slope engineering.Loess has obvious characteristics such as loose structure,vertical joint development and collapsibility.Under the action of external environment,the slope has unique engineering characteristics.The monitoring contents specified in the existing slope safety monitoring codes are universal and empirical,which makes the application of the codes have certain limitations.In this paper,the law of slope response under load is studied in depth,which provides theoretical basis and implementation method for slope safety monitoring.In this paper,under the engineering background of the construction of a new campus of university in Yan'an New District,Shanxi,the high slope formed during the construction process is taken as the research object,and the filling process of the slope,the road driving process on the top of the slope,and the rainfall infiltration process are used as the analysis conditions.The deformation mechanism and stress situation of the slope body are analyzed.And on this basis,guide the design and implementation of the slope safety monitoring system.The research work mainly involves the following:The FLAC3 D software is used to establish the numerical model of the slope to realize the layered filling process of the slope soil.Calculating and analyzing the deformation law and stress of the slope soil to determine the potential failure mode and sliding trend after the slope is filled.Combined with the strength reduction method,the overall slope stability coefficient is calculated to evaluate the slope stability.After the slope filling is completed,the deformation of the slope soil under long-term micro-dynamic load is calculated,and the distribution of the plastic zone of the slope body and the dynamic response law are analyzed.The results show that the dynamic load mainly affects the top of the slope and the shallow soil on the slope,and it is easy to form the exfoliated landslide on the slope.Based on the saturated-unsaturated seepage theory,the fluid-solid coupling calculation under the condition of rainfall infiltration was carried out,and the influence of rainfall intensity and duration on the slope deformation was analyzed.The results show that: when rainfall occurs,the possibility of sudden landslides is greatly increased,and the rainfall duration and rainfall intensity make the slope soil deformation amount increase and the deformation speed increase.Guided by the law of slope deformation,the slope safety monitoring system was designed and applied to the slope project of Yan'an New District.At the same time,the on-site monitoring data provides quantitative indicators for the safety evaluation of slope engineering,and provides help for slope early warning.Comparing the data from on-site monitoring and numerical simulation,the results show that the numerical simulation results are basically consistent with the on-site monitoring data,indicating the reliability of the numerical model analysis results.In order to predict the slope deformation trend,the method of combining EEMD and BP neural network was used to establish the slope deformation prediction model.The model realizes the modal decomposition of the deformation law,coupled with the superiority of the neural network for describing non-linear features,the prediction results are accurate.