Stability Analysis Of Han Yan Canal Dike With Implanted Bridge Pile Foundation

With the introduction and implementation of the national "All Along" initiative,the road traffic industry will usher in a new big development during the "Thirteen-Five-year" period,and Ningxia,as an important node of the Silk Road Economic Belt,has greatly improved its construction in the field of transportation and faces a large number of slope engineering problems.According to the actual slope engineering problems encountered in the reconstruction and extension project of Yinchuan,this paper uses the strength reduction method to study the stability of Han Yan Canal dike slope under the whole process of the proposed Bridge foundation across Han Yan Canal,and uses abaqus FEM simulation software to analyze the excavation depth of different pile foundations and The influence of the depth of implant and the placement of different pile foundation and different water level on the slope stability of Han Yan Canal embankment in late stage.The main research contents and results are as follows:(1)According to the construction drawing and geological investigation report of Han Yan Canal Bridge,the types and characteristics of slope of Han Yan Canal dike are analyzed,and the two-dimensional finite element model is established.The influence of excavation depth of different pile foundation on the slope stability of canal embankment is analyzed by Abaqus.The results show that the displacement of slope is consistent with that of producing plastic penetrating zone,when the excavation position of pile Foundation is outside the fracture surface of slope,the safety factor FV of slope is floating around 1.64,at this time,the excavation depth of different pile foundation does not affect the stability of the slope of canal Embankment obviously,In the process of pile foundation excavation,there is no need to artificially reinforce the slope.Therefore,it is suggested that the design of pile position should be arranged on the inner slope of the canal dike(i.e.the sliding surface),which can shorten the main span span and reinforce the slope.(2)Using the Mohr-Coulomb constitutive model embedded in Abaqus,the influence of the pile foundation with different depths and different positions on the stability of the embankment slope is analyzed.The results show that the placement of pile Foundation has a great influence on the stability of the slope,when the pile foundation is arranged outside the fracture surface of the slope,such as the design of pile position,the reinforcement of the slope is not obvious,but the layout of the slope on top of the fracture surface,it will have a clear reinforcement effect,and the slope anti-slide pile has a similar effect.However,when the pile foundation reaches a certain depth,the reinforcement effect of the slope is no longer obvious,and the safety factor of the slope will stabilize near a certain value.(3)The paper introduces three kinds of modes of water level drop,discusses the difference and discriminant basis of water level sag and slow drop,and calculates the safety factor of canal dike slope under two situations of water level plunge and slow drop by using Abaqus.The results show that the impact of water level on slope stability is greater at the initial stage of decline,and the effect of slope stability is gradually weakened.In the whole process of water level change,slope safety coefficient is lower than slow drop,the slope stability is the highest when water level is slow down,and the slope stability is the lowest.On the whole,the minimum safety factor(slump)of the slope is fv1=1.357>1,its influence on the slope stability is limited,and it does not cause the slope damage.Based on the above research,this paper reveals the mechanism of the pile foundation in the early stage of the pile foundation excavation to the slope stability of the canal embankment,the changes of slope stability along with the depth of pile foundation excavation,the depth of implantation and the drop of water level after pile Foundation are analyzed,which provides an important basis for project design of relying on engineering.It can provide some reference for the design and construction of similar projects.