An Analysis On Static,Dynamic Mechanical Characteristic And Mesoscopic Numerical Simulation Of Cement Solidified Coastal Aeolian Sands

Aeolian sand particles are loose, poor self-stability and difficult to compaction. If the material is used as roadbed filler, the roadbed is especially prone to distortion, collapse, instability and other problems in the course of the project. Cement can successfully solidify sandy soil. If aeolian sand cured with appropriate dose of cement, the the strength, water stability and anti-shrinkage properties of aeolian sand can be improved. The problem of curing aeolian sand has become one of the important research in engineering and academic fields.This article get the particle morphology characteristic of coastal aeolian sand by the grain shape and grain size analyzer firstly. Then, this article researches macroscopic mechanical properties of cement solidified coastal aeolian sands. Finally, this article made the static load and cyclic load numerical simulation test test of cement solidified coastal aeolian sands. We obtaining the spatial distribution and statistical average of microscopic fabric parameters of cement solidified coastal aeolian sands during loaded, when the numerical model proved to be reliable by analysising and comparing laboratory and simulation results. This provides evidence to explore cement solidified coastal aeolian sands’ microscopic mechanism of macro mechanics.Research indicates:Zhang Pu coastal aeolian sand particles are obvious irregularities, less angular shape and nearly circular features. They belong to poor graded sand.The static triaxial tests show that: With increasing the doses of cement, the cement solidified coastal aeolian sands’ peak intensity and initial modulus increases, but the reduced peak strain. The cyclic loading tests show that:With increasing the doses of cement, sample’s liquefaction vibration times significantly increased, pore pressure surge stages grow faster, access the slow growth phase of hole pressure faster, but the later stage of pore pressurerise stage rise slowly, eventually leading to liquefaction strength of the sample increases. The numerical simulation of particle flow basically reproduces the curve characteristic of stress-strain and excess pore water pressure-vibration times of cement solidified coastal aeolian sands’ laboratory test. It can qualitatively reflect the microscopic fabric evolution of the cement solidified coastal aeolian sands in the process of static load damage,liquefaction undermine. Static loading simulation test show that: Sand particles’ movement trend changed after the initial yield state due to the cement cementation. specimen appears directional distribution of shear displacement field in the peak state and eventually forms shear band. With solidified by the cement, aeolian sand sample internal structure is more stable,the transformation of energy is more difficult to affect by the confining pressure, plastic deformation dissipated energy and frictional dissipation energy of the specimen increase. cyclic loading simulation experiments show that: The total number of particles’ contacts is significantly reduced when the sample initial liquefaction, and then changes to fluctuate and reduce slowly.When the sample received cyclic loading, the number of sheets of bond damage basically is not affect by cement dose. But the number of bond shear failure significantly increases and and the distribution of the sample’s bond destroyed becomes more uniform when the doses of cement increasing.