Research On Optimization Of Solidified Soil Lining Structure On Saline-channel Monitoring

The western part of Jilin Province is located in the seasonal frozen soil area and the saline-alkali soil area.The construction of large water conservancy projects such as "from Nen River to Baicheng City" and "Da’an Irrigation District",channel projects are increasing day by day,providing excellent conditions for grain production.Channel channel when the water in the summer,is probably the channels to meet the water soak in water for a long time,in the soil salt dissolve into the water,and go with the flow,the channel to meet phenomenon dissolve in the water,winter canal base soil mass under the effect of frost heave,the loose caused by soil structure damage,soil erosion,the channel slope cracks,safety stability is reduced,greatly affected the efficiency of farmland irrigation.In this paper,a prototype monitoring test was arranged in the test section of The Test station channel of Qian ’an City,Songyuan City,Jilin Province as the research object.The temperature,humidity,soil pressure,groundwater level and frost heave amount of the foundation soil of the three-layer canal were monitored in real time for a hydrological year.SPSS software was used to analyze the monitoring data and fit the nonlinear regression equation.The finite element model of the prototype channel was established by ABAQUS software,and the numerical simulation was carried out by using the sequential thermal coupling method,which was compared with the results of the prototype test to verify the rationality of the model.The most reasonable structure of solidified soil lining was obtained by numerical simulation and economic analysis of different thickness of solidified soil lining channels.The main research results are as follows:(1)The prototype monitoring test was arranged in the test area,and the temperature,humidity,frost heaving force and frost heaving amount of the saline-alkali soil prototype channel were monitored in three layers in real time,and data were obtained through the "knowledge cloud" platform.Through curve fitting and nonlinear regression analysis,the nonlinear regression equations of the frost heave of the three-layer canal foundation soil with respect to temperature,humidity and frost heave force were obtained respectively.(2)Through data analysis,the variation of temperature,humidity,frost heaving force and frost heaving amount with time was obtained.SPSS software was used for correlation analysis,the correlation between the influencing factors and the amount of frost heave of canal subsoil is obtained in turn:humidity>temperature>frost heaving force.Through curve fitting and nonlinear regression analysis,the nonlinear regression equations of the frost heave of the three-layer canal foundation soil with respect to temperature,humidity and frost heave force were obtained respectively.(3)The channel model of solidified soil lining with different thickness was established,and the deformation and stress fields were optimized by sequential thermal coupling method,the results show that the frost heaving displacement,normal frost heaving force and tangential freezing force of lining slabs with different thickness vary from small to small.Aim for minimum frost heave,The solidified soil lining board with slope foot of 10～12cm is the most suitable.On the premise of ensuring the safe and stable operation of the channel and combining with the analysis of engineering economy,8～10cm solidified soil lining board is selected as the optimal structure.