| Title |
Geotechnical Characteristics of DCM-Improved Specimen Under Artesian Pressure |
| Authors |
윤대호(Yun, Dae-Ho) ; 김윤태(Kim, Yun-Tae) |
| DOI |
https://doi.org/10.12652/Ksce.2022.42.2.0187 |
| Keywords |
피압; 연약지반; 동수경사; 페놀프탈레인 Artesian pressure; Soft ground; Hydroulic gradient; Phenolphthalein |
| Abstract |
This study investigated the effect of artesian pressure on mechanical properties of deep cement mixing (DCM)-improved specimens.
Various laboratory tests such as unconfined compression test and scanning electron microscope (SEM) were conducted on DCM specimens which curied in a water tank with different artesian pressures. The artesian pressure was determined in consideration of the laboratory scale and the hydraulic gradient in field conditions. Results of experimental tests indicated that unconfined compressive strength, secant modulus, and unit weight of specimen decreased and water content tended to increase as an artesian pressure increased.
The stress-strain behavior changed brittle to ductile behaviors as an artesian pressure increased. The outflow water from the water tank
reacted with the phenolphthalein solution due to the leaching phenomenon of the improved specimen. SEM analysis also confirmed that a small amount of ettringite was formed between soil particles in the specimens with artesian pressure. |