Mechanical Properties Analysis And Fractional Derivative Creep Model Of Diatom Mudstone

The mechanical properties of diatomaceous mudstone is an important research subject in the soft soil layer characteristics of diatoms,through appropriate technical means,systematic study of diatomaceous mudstone from the material composition,macro and micro structure,physical properties,strength characteristics,mechanics and mechanics of frozen soil characteristics,study the physical and mechanical properties and deformation,so as to strengthen the understanding this kindofspecialregional soil.The X-ray optical microscope is used to reconstruct the data image,and the whole scanning image of the sample and the information of three different directions are extracted.By analyzing the two-dimensional gray scale of the cube element,the percentage of the volume of the extracted mineral particles is calculated.Through analyzing the pore characteristics of core,the porosity,total pore volume,maximum pore volume,average pore volume and other parameters were obtained,and the pores with different equivalent diameters were sieved.Finally,the volume fraction of connected pores and unconnected pores is obtained byanalyzing the porosity of the sample surface,andtheseepageprocessofconnected poresis simulated.Based on the experiments in diatomaceous mudstone under different confining pressures,and the use of Excel nonlinear programming,the shear strength index were obtained,draw Mohr failure stress circle and strength envelope,and compared with the actual results,through artificial drawing calculation calculation error and linear programming method.Find the absolute error in the0.2~0.4kPacohesion,internalfrictionangleoftheabsoluteerrorinthe0.2~0.5 degrees.In the study of diatom mudstone at low temperature,the relationship between compressive strength and elastic modulus and temperature is studied respectively.The uniaxial compression process of frozen diatomite mudstone is simulated by FLAC3 D software.And through the analysis of the creep curve of diatomaceous mudstone,found the whole process of creep simulation of fractional derivative Xiyuan model simulated annealing algorithm can be used to freeze diatom soil layer,canbeapplied toengineeringpracticebetter.