Study On Stability Of Canal Dike In Jiaozuo Section Of Middle Route Project Of South-to-North Water Diversion

With the attention of countries around the world to the rational application of water resources,many large-scale water conservancy projects have been built one after another.Once the slope of these projects is unstable,it will cause serious harm to the country and the people.Due to the uneven distribution of water resources in the north and south of China,in order to alleviate the water shortage in the north,the South-to-North Water Diversion Project was built.The Jiaozuo urban section of the Middle Route of the South-to-North Water Diversion Project is the only canal section across the urban area,but the instability will seriously endanger the safety of Jiaozuo people.In this paper,the canal embankment of Jiaozuo urban section of the Middle Route Project of South-to-North Water Diversion is taken as the research object.Combined with the local engineering geological conditions,the two-dimensional and three-dimensional models of the effective and failure lining of the canal embankment are established by using numerical simulation software,and various working conditions are set up to study the stability of the canal embankment,so as to provide theoretical support for preventing embankment failure accidents.The main research contents are as follows :(1)Briefly introduce the characteristics of South-to-North Water Diversion Project and Jiaozuo urban section project.Combined with the survey report,the geological background of the study area is introduced in detail.(2)Based on the limit equilibrium theory in Geostudio software,the typical section of canal embankment in Jiaozuo urban area is selected to establish the model of canal embankment,and the stability of the model in the natural state when the lining is effective and ineffective is calculated.Then,the stability of canal embankment under water level fluctuation and earthquake is numerically simulated,and the stability of typical canal embankment under different working conditions is analyzed.The numerical simulation results show that the effectiveness of the lining has a great influence on the stability of the canal embankment.When the lining is effective,the stability of the canal embankment decreases under the action of water level fluctuation and earthquake,and the canal embankment remains stable.However,once the lining fails,the stability of the canal embankment drops sharply,and the water level fluctuation and earthquake action will make the canal embankment unstable.(3)Based on the strength reduction method in FLAC3 D numerical simulation software,a typical section of Jiaozuo urban area was selected to establish a three-dimensional model for the effective and failure of the dike lining,and the stability of the dike was calculated under the natural state,water level rise,water level fall and seismic action,and the results were analyzed in terms of deformation,shear strain increment and main stress characteristics.The numerical simulation results show that the lining greatly affects the stability of the embankment,and once the lining fails,the water level rise and fall and seismic action will increase the deformation of the embankment and make it unstable.(4)The simulation results of Geostudio and FLAC3 D in natural state,water level rise,water level drop and earthquake action are compared.The stability results of the two are similar,which proves the validity of the model.(5)In order to ensure the safety of this section of the channel,on the basis of the original proposed to strengthen the channel lining,seepage control,drainage,seepage control and other aspects to improve the safety of the relevant measures.