Abstract
In this study, to explore the microstructure deformation mechanism of marine soft marine soil under cyclic loading, we analyzed the dynamic properties of soft marine soil under cyclic loading via dynamic consolidation compression testing. Then, using Image-Pro Plus (IPP) 6.0 image analysis software, and according to the dynamic consolidation compression test results and the images from a scanning electron microscope (SEM), we determined the weakening effect of soft soils under different consolidation confining pressures, different cyclic stress ratios, and different over-consolidation ratios. After dynamic consolidation and compression, the pore structure of undisturbed soft marine soil tends to compact, the degree of soil particle fragmentation intensifies, small pores increase, large pores decrease, the pores become more regular, and the distribution of pores is directional. Subsequently, for undisturbed soft marine soil, the higher the consolidated confining pressure, cyclic dynamic stress ratio, and over-consolidation ratio, the greater the damage to the pore structure, and the more obvious the structural weakening effect exhibited under cyclic loading.
Highlights
With ongoing economic development, the resulting increased construction of large infrastructure is facing significant challenges when soft soil is encountered
When reviewing the studies above, we found that research on the dynamic characteristics of soft marine soil under cyclic loading is scarce, and that research on the coupling analysis of the macroscopic dynamic response and microscopic internal characteristics is relatively rare
To explore the laws governing soft marine soil macroscopic mechanical behavior and microscopic characteristics, we used microstructure parameters to qualitatively analyze the dynamic characteristics of the changes in soils through dynamic consolidation compression and scanning electron microscope (SEM) tests
Summary
The resulting increased construction of large infrastructure is facing significant challenges when soft soil is encountered. Ding et al [17] researched the microscopic characteristics of frozen-thawed soft marine soil under cyclic loading using a scanning electron microscope and explained the potential reasons for the change in the macroscopic dynamic characteristics from the microscopic point of view. When reviewing the studies above, we found that research on the dynamic characteristics of soft marine soil under cyclic loading is scarce, and that research on the coupling analysis of the macroscopic dynamic response and microscopic internal characteristics is relatively rare. To explore the laws governing soft marine soil macroscopic mechanical behavior and microscopic characteristics, we used microstructure parameters to qualitatively analyze the dynamic characteristics of the changes in soils through dynamic consolidation compression and SEM tests. The research results help explain the microscopic deformation mechanism of undisturbed soft marine soil under cyclic loading, which is of reference value for theoretical exploration and engineering practice
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