| Slope is a common geological environment in engineering.Nowadays,slope has become three major geological disaster sources together with earthquakes and volcanoes.Therefore,the method that can judge the slope stability efficiently has become an important way to solve the slope problem.In this paper,the ground penetrating radar(GPR)is used as the survey equipment to survey the internal structure of the slope,and then the improved Janbu method is used as the stability analysis method to analyze the slope stability,so as to achieve the purpose of efficiently and accurately solving the slope geological disaster problem.In this paper,firstly,the analysis methods of limit equilibrium state of slope are screened,and Janbu method is determined as the main safety factor calculation method and improved slightly.The model is drawn qualitatively and quantitatively,and the control variables are classified from lithology,angle and internal abnormal structure to draw the model to analyze stability and determine the main internal factors affecting slope stability.In lithology category,rock and soil slopes encountered in engineering are analyzed,reasonable model design is carried out in the area where the slope angle is between 18.5 and 48.5,and then key factors affecting stability are screened.Since GPR can effectively survey most abnormal targets in the slope,it is necessary to design a slope model with complex internal geological structure for GPR forward modeling,and compare the forward reflection with the landslide area in the model.Of course,the actual situation has also been simulated,that is,the slope with complex internal structure is designed for radar forward modeling,and then the model is drawn in GEO-Studio.The parameters used are calculated according to radar data and obtained by consulting geological data.Finally,it is determined that some abnormal conditions are indeed the internal factors affecting slope stability.In addition,the verification and analysis of the measured data were carried out.Three survey lines were arranged on the slope of a mountain road in Anhui Province for experimental ground penetrating radar survey.The radar data obtained from all survey lines were inverted for slope structure,and the slope model was drawn according to the results.The geotechnical engineering software GEO-Studio was used for drawing,and the safety factor and stability analysis were calculated by the improved Janbu method.The landslide risk range was compared with the radar data,which confirmed the feasibility of the synergy between the two methods.Therefore,through the analysis of a large number of slope models,it is concluded that lithology has a greater impact on stability.Then,GPR is introduced as an effective means of internal structure investigation,which is very effective for the division of strata and the judgment of internal anomalies.It can determine strata,hollowed-out and broken zones,etc.,so as to conduct comprehensive stability analysis,and the final result is in line with expectations. |
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