Laboratory Test for the Performance of Grouting under Hydrostatic Pressure

Kyoung-Jea Jun; Myounghak Oh; Chan-Young Yune

doi:10.7843/kgs.2017.33.10.49

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2017 Vol.33, Issue 10 Preview Page Next Page

Laboratory Test for the Performance of Grouting under Hydrostatic Pressure 정수압을 고려한 그라우팅의 성능에 대한 실험적 연구

31 October 2017. pp. 49-58

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Abstract

Grouting for soil improvement has generally been applied to the depth over water table. Recently, it is needed to develop the grouting technique for soils under greater static water pressure or greater overburden pressure in constructions such as deep excavation or harbour deepening. In this study, a laboratory apparatus was developed to control the injection pressure, load pressure, and hydrostatic pressure. A series of experiments were performed with various degrees of hydrostatic pressure using the developed equipment. As a result, injected volume increase as injection pressure increase, while the volume significantly decreased under hydrostatic pressure. Larger volume of grout bulb was shown in soils with larger granular and pore size based on the comparison result of volume changes with respect to the amount of grouting injection.

Keywords

Grouting

Water pressure

Injection pressure

Load pressure

일반적인 지반보강 그라우팅은 지하수위의 영향이 없거나 미약한 얕은 심도에서 이루어진다. 그러나 최근들어 대심 도 굴착이나 항만성능 향상을 위한 증심공법 등이 대두되면서 높은 수압과 상재압의 영향을 고려한 효율적인 그라우 팅에 대한 연구의 필요성이 점차 높아지고 있다. 이에 본 연구에서는 주입압, 상재압, 수압을 조절 가능한 그라우팅 모사장비를 개발하여 정수압을 고려한 그라우팅 성능 분석 실험을 수행하였다. 그 결과, 일반적으로 주입압을 증가시 키면 주입량도 증가하나, 수압이 작용하는 경우에는 주입량이 크게 감소하는 것으로 나타났다. 또한 그라우팅 주입량 에 따른 시료의 체적변화를 비교한 결과, 시료의 입경이 크고 간극 크기가 클수록 침투로 인한 다짐효과가 커진다는 것을 확인할 수 있었다.

References

Kim, J. C., Yoo, B. S., Kang, H. J., and Kwon, Y. S. (2014), A Fundamental Study of a Neo-grouting Technology for the Decreasing of a Ground Disaster in a High Water Pressure Conditions, Journal of Korean Society of Societal Security, Vol.7, No.1, pp.9-16.

An, J. H. (2007), Ground Deformation depending on Excavation Methods for NATM Tunnel through Thick Weathered Rock, Master’s Thesis, Hanyang University, pp.22-31.

Yang, T. S., Lee, C. H., and Kim, J. S. (2013), A Study of Effects on Caisson Structures by Reinforcements of Additional Dredging Depth in Front of the Quaywall, Journal of Construction and Environmental Research Institute, Vol.8, No.2, pp.163-174.

You, K. H. and Kim, E. H. (2010), A Study on the Stability Analysis for Grouting Reinforcement in a Subsea Tunnel, Journal of Korean Tunnelling and Underground Space Association, Vol.12, No.2, pp.145-155.

Information

Publisher :The Korean Geotechnical Society
Publisher(Ko) :한국지반공학회
Journal Title :Journal of the Korean Geotechnical Society
Journal Title(Ko) :한국지반공학회 논문집
Volume : 33
No :10
Pages :49-58
Received Date : 2017-06-28
Accepted Date : 2017-09-27
DOI :https://doi.org/10.7843/kgs.2017.33.10.49

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

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