In order to explore the mechanism of recompression deformation of clay under constant stress state,a new consolidation device was designed.A one-dimensional consolidation recompression test,nuclear magnetic resonance test,and electron microscopy scanning test were conducted on saturated samples,quan-titatively analyzing the changes in pore water and microstructure during the recompression process.The re-sults show that the newly developed device has less influence on the test results,that free water is continu-ously discharged during recompression,which is macroscopically manifested as an increase in the deforma-tion of the specimen and a larger coefficient of consolidation,and that the coexistence of bound water dis-charge and formation phenomena leads to a nonlinear change in its content.With the recompression,the pore water decreases,and the specimen evolves from skeleton-flocculation structure to more compact agglomera-tion-flocculation structure,the medium pore space decreases,and the number of small pores increases.The results can explain the engineering phenomena better,and provide theoretical basis for solving the enginee-ring problems of foundation settlement control.
clayrebound and recompressionpore watermicrostructure
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