Stability Evaluation And Prediction Of Huluding Bridge-Yinghua Bridge Section Landslidel On The North Bank Of Yongjiang River In Nanning City

In recent years,Nanning has successively carried out river regulation,and built Laokou hydropower station and Yongning cascade water conservancy project.After these projects are completed,the water level of Yongjiang river will reach 67.0m,and the rising water level will affect the stability of bank slope.There are bad geological conditions such as collapse,landslide,expansion soil and soft soil on the bank slope of Huluding bridge and Yinghua bridge on the north bank of Yongjiang river in Nanning city.The surface of the landslide is filled with thick,uncompacted,loose structure,Low shear strength,and composition of clay shale is medium swell-shrink,swell water loss contraction,repeatedly swell-shrink are prone to fracture,long-term affected by rivers,is the key area for the collapse of the landslide geological disasters,If the prevention and control measures are not taken,it will seriously affect the "Yongning hub flood control treatment project",Yinghua bridge revetment project,Nanning Liusha peninsula Binjiang ring road phase II project slope treatment project,Yongjiang comprehensive control and development and utilization project and other projects and endanger the serenity coast of the peninsula eastern district people's life and property safety.Therefore,it is of great theoretical and practical significance to carry out landslide stability evaluation,prevention and predictionimmediately,provide theoretical basis and technical support for dealing with bad geology,minimize the risk of landslide damage,and ensure the safety of people's lives and propertyThis paper through the extensive collection and review of the relevant literature in the north bank of Yongjiang river,first of all,from the landslide's engineering geological environment and basic characteristics as a starting point to carry out the stability evaluation;Secondly,simplified Bishop method is used to calculate landslide stability safety coefficient.;Thirdly,the influence factors of the landslide stability are analyzed by using the method of Dengjulong grey relational degree;In addition,according to the evaluation conclusion of landslide instability and the factors that affect the stability of landslide,four landslide prevention and control measures of ecological protection and mechanical balance in the drainage engineering of slide-belt soil were put forward;Finally,the gray system theory is used to predict the vertical displacement of anti-slide pile after the landslide control project is completed,and the grey Verhulst model is constructed with time-cumulative displacement value,and the predicted value is compared with the measured value,confirming that Verhulst model can accurately predict the change law of initial displacement value of anti-slide pile;According to the relevant deformation monitoring specifications and the measured displacement data of anti-slide pile,the conclusion that the landslide control effect is good and in a stable state is obtained.Through the study of landslide stability evaluation and prediction,and to further safeguard "Yongning hub flood control processing special" project,the Yinghua bridge revetment engineering,Nanning Liusha peninsula Binjiang loop II phase slope engineerings and Yongjiang river comprehensive improvement and smooth implementation of the development and utilization of engineering projects such as the use of safe and nearby buildings.Changing the human-water relationship from "harmful" to "beneficial" can provide valuable reference andreference for improving the natural ecological environment of river banks,which has higher theoretical and practical significance.