Consideration of Engineering Strength and Filling Characteristics for Rubble-Ground Modification Method with Grout Injection

Hyeong-Ki Kim; Jin-Gyu Han; Jeong Eun Kim; Yong-Sun Ryu; Anh Dan Nguyen; Gyeong-O Kang; Young-Sang Kim

doi:10.7843/kgs.2022.38.5.47

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2022 Vol.38, Issue 5 Preview Page Next Page

Research Article

Consideration of Engineering Strength and Filling Characteristics for Rubble-Ground Modification Method with Grout Injection 그라우트 주입식 사석기초 보강 공법의 개량체 강도 및 충전성에 대한 실험적 검토

31 May 2022. pp. 47-59

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Abstract

A series of experiments were performed to investigate the design and application of a rubble-ground modification method with grout injection. A small-sized injection machine was designed, and the grouts with various mix proportions were injected into 25 mm aggregate using the designed small-sized injection machine. With the compressive strength of the grout ranging from 20 to 80 MPa, the uniaxial compressive strength of the grout-filling bodies with clean gravels was higher than 1/6th of the strength of grouts themselves. However, this fraction may reduce depending on the interface conditions. The erosion resistance of the hardened grout was evaluated, and it was determined that the grout with a strength greater than 15 MPa did not require erosion consideration. Moreover, a full-scale injection test was performed for 25 cm-sized rubbles in cages with a diameter greater than 1 m and a height of 1.2 m to evaluate the filling characteristics of the grout. Results from this test indicated that the grout flowability sensitively influenced the filling characteristics.

Keywords

Engineering strength

Erosion

Filling characteristics

Ground modification

Grout

본 연구에서는 사석지반 충진을 위한 그라우트 주입공법의 설계 및 시공에 대한 일련의 기초 실험을 진행하였다. 먼저 소형 그라우트 주입장치를 설계제작해 25mm 단입도 골재에 수중주입 하였다. 이 축소실험 결과, 그라우트의 압축강도 범위가 20-80MPa 수준일 때, 표면이 깨끗한 자갈을 그라우트로 보강한 개량체의 일축압축강도는 그라우트 자체의 강도에 비해 약 1/6 수준이었다. 하지만, 이 개량체의 강도는 골재 계면의 조건에 따라 크게 감소할 수 있음을 확인하였다. 또한, 개량체용 그라우트의 수중마모 저항성을 평가하였으며, 실험결과 15MPa 이상의 그라우트는 유수에 의한 마모를 고려하지 않아도 되는 것으로 확인 되었다. 마지막으로 25cm 크기의 사석부에 지름 약 1m 높이 1.2m 수준의 대형 구근을 제작해 충전성을 검토하였으며, 이 결과 그라우트의 유동성에 의해 사석 충전성능이 크게 영향 받는다는 것을 알 수 있었다.

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Information

Publisher :The Korean Geotechnical Society
Publisher(Ko) :한국지반공학회
Journal Title :Journal of the Korean Geotechnical Society
Journal Title(Ko) :한국지반공학회 논문집
Volume : 38
No :5
Pages :47-59
Received Date : 2022-05-03
Revised Date : 2022-05-19
Accepted Date : 2022-05-20
DOI :https://doi.org/10.7843/kgs.2022.38.5.47

Journal of the Korean Geotechnical Society ISSN:1229-2427(Print) 2288-646X(Online) 한국지반공학회 논문집

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