[논문]암반 그라우팅 주요 계획인자의 기준값에 관한 기초연구

김종민; 이응기

doi:10.7843/kgs.2022.38.2.15

[국내논문] 암반 그라우팅 주요 계획인자의 기준값에 관한 기초연구
A Fundamental Study on the Criteria of Basic Parameters for Planning Rock Grouting 원문보기

韓國地盤工學會論文集 = Journal of the Korean geotechnical society, v.38 no.2, 2022년, pp.15 - 27

김종민 (세종대학교 건설환경공학과) , 이응기 ((주)제일엔지니어링 철도부)

초록
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암반 그라우팅은 시설물 지반의 안정성을 향상시키는 보강 및 재해방지 대책으로서의 적용성이 날로 증가하고 있으나, 현장에서의 그라우팅은 대부분 경험에 의존하는 바 가이드라인으로 사용할 수 있는 주요 계획인자에 대한 최소 기준값이 필요한 실정이다. 본 연구에서는 암반 그라우팅 계획에 있어 중요한 인자인 주입조건(물-시멘트비, 주입압, 단위 시멘트 주입량)과 그라우팅 효과(변형계수와 투수성)에 대한 기준값을 제시하였다. 제시된 기준값들은 국내외 수압파쇄시험 및 암반 투수시험 자료, 국내외 17개 현장의 그라우팅 시험시공 자료, 그리고 국내외 기준 및 연구를 분석한 결과이다. 또한 그라우팅 효과를 제고하기 위한 안정한 주입재의 조건에 부합하도록 국내의 높은 물-시멘트비는 조정되어야 하며, 조정된 물-시멘트비 적용에 따른 기준값 조정방안도 살펴보았다. 본 연구의 결과 역시 경험의존적인 측면이 있지만, 현재 기준 보다 합리적인 그라우팅 계획의 기준을 제시를 위한 향후 세부연구의 기초자료로 활용할 수 있을 것이다.

Abstract ▼ AI-Helper

Despite the increasing applicability of rock grouting as a method for strengthening or disaster prevention by improving the stability of ground, criteria for planning parameters which can be used as minimum guideline are required since the current practice is mainly dependent on experience. In this study, the fundamental criteria for important parameters of rock grouting in terms of injection conditions such as water-cement ratio, injecting pressure, cement take and resulting effects such as deformation modulus and permeability are proposed. Those criteria are the results of analyses of a series of hydraulic fracturing tests and Lugeon tests, in-situ grouting tests at 17 sites in Korea and other countries, combined with the literature analyses of standards and previous research. In addition, the method for modifying proposed criteria according to water-cement ratio is also addressed since that in Korean practice is too high and therefore, should be adjusted to satisfy the conditions of balanced stable grouting. The results of this study can be used as a fundamental reference for more refined research in the future although they are still somewhat experience-dependent.

Keyword

표/그림 (13)

표 Table 1. Parameters measured at each site used for study (arranged from Lee, 2015)
그림 Fig. 1. Rheology of Bingham fluid (after Wikimedia, 2013)
그림 Fig. 2. Stability of grouting (US Army Corps of Engineers, 2017)
표 Table 2. Comparison of criteria for limiting injection pressure
$Fig. 3. Typical injection pressure-time curve of hydrofracturing test$ 그림 Fig. 3. Typical injection pressure-time curve of hydrofracturing test
$Fig. 4. Hydraulic fracturing and jacking pressure versus surcharge pressure$ 그림 Fig. 4. Hydraulic fracturing and jacking pressure versus surcharge pressure
표 Table 3. Characteristics of sites and result of injection test (arranged from Lee, 2015)
그림 Fig. 5. BIPS image and p-q-t chart of injection hole A-1 and A-3 (Lee, 2015)
표 Table 4. Proposal of limiting injection pressure according to rock condition
그림 Fig. 6. Cement take versus Lugeon
그림 Fig. 7. Increment in the modulus of deformation by grouting
표 Table 5. Proposal of increment ratio of modulus of deformation
표 Table 6. Permeability and flow types after grouting (arranged from Lee, 2015)

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