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A Study on the Ground Improvement Effect with Grouting in Backside of Retaining Wall  

Chu, Ickchan (한양대학교 대학원 건설환경공학과)
Byun, Yoseph (한양대학교 대학원 건설환경공학과)
Baek, Seungin (한양대학교 대학원 건설환경공학과)
Chun, Byungsik (한양대학교 공과대학 건설환경공학과)
Publication Information
Journal of the Korean GEO-environmental Society / v.13, no.10, 2012 , pp. 77-83 More about this Journal
Abstract
Recently, excavations using propped walls were popularized in downtown due to reduced settlement of nearby structures. These excavations is induced strain to propped walls or settlement in near ground. In this study, the ground reinforcing effect was proven using NDS, which is an inorganic injection material. Injection tests were performed to compute optimum injection pressure and volume. Next, calibration chamber tests were performed by using computed injection pressure and volume, and wall behaviour was examined for overburden pressures of 50kPa and 150kPa. Ground reinforcing effect was shown when the material behind the propped wall was grouted. From test results, optimum injection pressure was 350kPa and the optimum volume was 10L considering economics. Calibration chamber test results show that after the material was grouted, the maximum settlement was reduced to 19% of the non-grouted condition. For overburden pressures of 50kPa and 150kPa behind the wall, the settlement of the wall increased by 58% and 57% when compared to the case of no overburden pressure.
Keywords
Excavations; Inorganic injection material; NDS method; Injection tests; Calibration chamber test;
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