Changes in Pore Water and Microstructure During the Rebound and Recompression Process of Clay
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
NETL
NSTL
万方数据
