Thixotropic Consolidation Of Remolded Soils Based On Deep Learning

With the steady progress of the development of Marine resources and utilization of Marine space,China’s "Reply to the 14 th Five-Year Plan for Marine Economic Development" put forward the goal of coordinating the protection and development of Marine resources and speeding up the building of a maritime power with Chinese characteristics.In the process of Marine construction,should be on the seabed foundation construction of Marine engineering building,in the process of construction,buildings and structures after injection of the seabed foundation,the foundation soil disturbance into completely reshape state,the follow-up time of soil at the same time is affected by the double thixotropic effect and consolidation,thixotropic effect caused by the increase of soil strength cannot be ignored in the engineering practice.Many researches have been done on the mechanism of strength increase in thixotropic process by domestic and foreign scholars,among which scanning electron microscopy can reveal the essential reason behind the macroscopic mechanical properties of soil.However,in the research process,SEM image segmentation is mainly based on threshold,object and manual segmentation,which has low efficiency and is restricted by subjective and image shooting conditions.In addition,the microstructure of soil subjected to thixotropy and consolidation at the same time was not studied in the past.To sum up,how to improve the microscopic research efficiency of soil and explore the relationship between microscopic parameters and mechanical properties of soil under the dual action of thixotropy and consolidation from the macro and micro level has important engineering value in the design and construction process,which is in line with the goal of building a maritime power with Chinese characteristics.In this study,the strength of ocean soil under different thixotropic conditions was measured by means of a falling cone instrument,the compression process of soil under different thixotropic conditions was simulated by one-dimensional consolidation test,and the soil micromorphology images under various working conditions were obtained by scanning electron microscope to form a database.The full convolutional neural network was built based on tensorflow platform,and trained through the database obtained by scanning electron microscope experiment.Finally,it was applied to the subsequent microscopic image analysis to conduct qualitative and quantitative analysis of the microscopic morphology and arrangement of soil in the thixotropic process and consolidation process of Marine soil,kaolin and bentonite.The microcosmic evolution mechanism and the relationship between microcosmic parameters and macroscopic mechanical characteristics of soil during thixotropic and consolidation processes are analyzed.The research results are as follows:A database consisting of 600 SEM images including Marine soil,bentonite and kaolin was obtained through scanning electron microscope experiment,and artificial image segmentation was completed.Three labels of soil pores,structural units and element segmentation boundaries were marked for the full convolutional neural network model training.Through the Tensorflow platform,we build a variety of deep learning semantic segmentation models such as U-net-Mobilet model,Deeplab-Xception model and PSPnet model based on lightweight network.Through the established image database training,the Deeplab-Xception model is concluded that the performance is best in the clay SEM image semantic segmentation task,and is used for subsequent microscopic image analysis,which will provide a new research idea for microscopic soil research.Thixotropic tests were carried out on Marine soil,bentonite and kaolin with different moisture content.The results show that kaolin has no obvious thixotropic characteristics,and the thixotropic strength ratio of bentonite is the highest when the water content is 0.75 times of liquid limit,reaching about 2 times of remodeling strength.The thixotropic strength ratio reaches the maximum at about 0.75 times water content and about 1.7 times remodeling strength.Through indoor soil in one-dimensional consolidation test on 3 different compression under the condition of thixotropic characteristics are studied,to obtain the microstructure of soil and the pore structure unit cell parameters and micro arrangement with load change trend,with the compression coefficient change tendency and analyzes the strength of soil mass under the effect of thixotropic ascend the microscopic mechanism of thixotropic effect in the process of the consolidation and the microscopic mechanism of influence.