Displacement Monitoring And Stability Analysis Of Soil And Rock Slope In Northern FuJian Mountains

The inland area in northwest FuJian is dominated by mountains and hills.The region is in a subtropical monsoon climate,warm and wet all year round,abundant rainfall,and there are typhoons,heavy rain often infestation.However,there are few studies on the instability of high slope in mountainous areas of FuJian.According to the different types of rock and soil,there are many different conditions in the way of judging the instability of high slope.In today's relatively perfect standard technology,there are still cases of high slope instability,necessary monitoring,early detection of problems to prevent more serious consequences and economic losses.However,how to interpret the characteristics of the deep displacement curve obtained by monitoring needs further study.Based on the study of deep displacement curve type of slope rock and soil,the displacement characteristic curve and displacement value of different types of slope are roughly classified.Combined with finite element numerical analysis of the slope critical instability displacement curve type and displacement value,and the measured curve displacement trend prediction.The specific contents of this paper can be summarized as follows:(1)This paper selects the high slope monitoring project of shunshao expressway in FuJian province,extracts the typical slope types,and establishes the typical slope models of different types.The project deep displacement monitoring data were collected in situ and processed into a cumulative disposition-depth curve.The characteristics of the displacement curve were summarized,and typical slope displacement curve examples were selected for in-depth analysis.(2)Based on geological survey report data or geological data obtained from laboratory tests,Midas software was used to conduct finite element numerical simulation analysis and calculation,and the stress,strain and stability coefficients of typical slope models were calculated and analyzed,and the types of displacement curves were classified and studied.Combining with comparative analysis of measured deep displacement curve characteristics and Midas calculation and analysis results,the characteristics of two types of slope displacement curve,the sliding surface reflected by displacement curve and the safe range of displacement value are compared and summarized.(3)The cumulative displacement-depth characteristic curve analysis of the slope shows that the monitoring hole positions of the upper side of the two types of slope present a “D” type characteristic curve,with obvious potential sliding surface,and the maximum horizontal displacement is located in the upper middle part of the monitoring hole.In the monitoring hole position of the lower slope,the soil slope showed “V” type and “r” type characteristic curve,and the binary soil rock slope showed “r” type and “pendulum” type characteristic curve.The maximum horizontal displacement is located in the orifice.The deep displacement indicated by the upper displacement monitoring hole position of the slope developed to 23~28mm,and the deep displacement indicated by the lower displacement monitoring hole position developed to 15~20mm,and the slope slipped significantly,which required intensive observation.(4)Grey theory GM(1,1)model has a higher fitting degree of prediction curve and a more accurate prediction after the timely addition of new data updating model.The comparison shows that the grey models of the two types of slope have higher accuracy,but the prediction curve fitting degree of the soil slope is more accurate and applicable than that of the binary soil slope.