Improvement of Cohesive Strength of Local Clay Using Geotextile by Sandwich Technology

Abstract

This Improvement Of Cohesive Strength Of Local Clay Using Geotextile By Sandwich Technology paper presents a series of consolidated-undrained triaxial compression tests for investigating the shear behavior of geotextile-reinforced clay and generating excess porewater pressure during undrained loadings.

The experimental results revealed that nonwoven geotextile as a permeable material reduced consolidation time during consolidation; however, it induced a higher volume change.

Using the additional confinement approach, modified porewater pressure parameters, A * and B *, were proposed for reinforced clay. Parameters A * and B * can be used to quantitatively evaluate the influence of soil and reinforcement on the generation of excess porewater pressure, respectively.

The A * value for unreinforced soil is close to the porewater pressure parameter A for Skempton. The B * is defined as the difference in the porewater pressure ratio to the additional confining pressure.

A comparative study is conducted on the suitability of the use of geotextiles in Kaolinite clay and sand. The impact of the number of geotextiles and the spacing of reinforcement in the strength of clay material is also studied.

Conclusion

Due to interface failure, reinforcement strength may be largely underused when used with cohesive soils by geotextiles. The particles in sand are less likely to be rearranged during shearing due to the high frictional characteristics of sand.