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2017 Vol.19, Issue 4 Preview Page
Bleeding characteristics of coupling materials for installation of acoustic emission (AE) sensor

AE 센서 설치를 위한 커플링 재료의 블리딩 특성

Jong-Won Lee 1
,
Hyunwoo Kim2
,
Min-Koan Kim3
,
Tae-Min Oh4*
이 종원1
,
김 현우2
,
김 경렬3
,
오 태민4*
1Researcher, Korea Institute of Geoscience and Mineral Resources (KIGAM)
Senior researcher, Korea Institute of Geoscience and Mineral Resources (KIGAM)
3Researcher, Korea Institute of Geoscience and Mineral Resources (KIGAM)
4Senior researcher, Korea Institute of Geoscience and Mineral Resources (KIGAM)
1비회원, 한국지질자원연구원, 복합재난대응연구단 연구원
정회원, 한국지질자원연구원, 복합재난대응연구단 선임연구원
3비회원, 한국지질자원연구원, 복합재난대응연구단 연구원
4정회원, 한국지질자원연구원, 복합재난대응연구단 선임연구원
*교신저자. *Corresponding Author. 
31 July 2017. pp. 635-650
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Abstract

Acoustic emission (AE) sensors have broadly used to monitor the damage of underground structures and tunnels. The reliability of measured signal is determined by the coupling condition of the AE sensors which are embedded in the target underground structure. To secure the reliability of health monitoring results, it is important to understand the characteristics of the coupling materials. In this study, laboratory tests were performed using portland cement, micro cement, and gypsum as coupling materials in order to verify the bleeding characteristics. The effective parameters for bleeding were determined to be water-cement ratio, material type, curing time, and injected volume of coupling materials. As a results of the experimental study, the bleeding rate increases with an increase in a water-cement ratio and an injected volume; for portland cement, water-cement ratio and injected volume effects are larger than the micro cement. However, curing time is not much effective for occurrence of the bleeding phenomenon. It is anticipated that this study may be useful for the selection of suitable coupling materials for installation of acoustic emission sensors.

Keywords
Acoustic emission sensor
Sensor installation
Coupling
Bleeding

도시의 발전에 따라 전력선, 통신선, 상하수도배관 등을 공동으로 수용하는 공동구의 수 요는 점점 증가할 것으로 예상되고 있으며 따라서 앞으로 TBM을 이용한 터널시공이 증가할 것으로 예상된다. TBM을 이용한 터널 건설시 굴진율 예측은 공기와 공사비 책 정의 중요한 요소이다. 현재, NTNU model, CSM model 등의 TBM 굴진율 예측방법 이 있지만, 이 방법들은 많은 입력 인자들을 필요로 한다. 본 논문은 문헌조사를 통해 다 양한 여러 지반 물성인자들 중, 경암의 취성지수 (Brittleness index)와 TBM 순굴진율 간의 관계를 도출하고자 하였다. 특히, 인장강도와 압축강도의 함수인 취성지수는 그 정 의에 따라 순굴진율과 관계가 다르고 매우 큰 분산을 가지는 것으로 나타났다. 본 연구는 TBM 순굴진율 예측에서 암반물성 중 취성도가 지니는 의미를 제시하고 있다.

키워드
AE 센서
센서 설치
커플링
블리딩
References
1
Amitrano, D., Grasso, J.R., Senfaute, G. (2005), “Seismic precursory patterns before a cliff collapse and critical point phenomena”, Geophysical Research Letters, Vol. 32, No. 8, L08314.
2
ASTM C940. (2010), Standard test method for expansion and bleeding of freshly mixed grouts for preplaced-aggregate concrete in the laboratory, ASTM International.
3
Axelsson, M., Gustafson, G., Fransson, Å. (2009), “Stop mechanism for cementitious grouts at different water-to-cement ratios”, Tunnelling and Underground Space Technology, Vol. 24, No. 4, pp. 390-397.
4
Cheon, D.S., Jung, Y.B., Park, E.S. (2014), “Development of acoustic emission monitoring system for the safety of geotechnical structures”, Journal of Korean Tunnelling and Underground Space Association, Vol. 16, No. 5, pp. 471-485.
5
Draganović, A. (2009), Bleeding and filtration of cement-based grout, Royal Institute of Technology, Ph.D. Thesis, Div. of Soil and Rock mechanics, Stockholm, pp. 59-61.
6
Ge, M., Hardy, H.R., Wang, H. (2012), “A retrievable sensor installation technique for acquiring high frequency signals”, Journal of Rock Mechanics and Geotechnical Engineering, Vol. 4, No. 2, pp. 127-140.
7
Ghourchian, S., Wyrzykowski, M., Lura, P. (2016), “The bleeding test: a simple method for obtaining the permeability and bulk modulus of fresh concrete”, Cement and Concrete Research, Vol. 89, pp. 249-256.
8
Høien, A.H., Nilsen, B. (2014), “Rock mass grouting in the Løren tunnel: case study with the main focus on the groutability and feasibility of drill parameter interpretation”, Rock Mechanics and Rock Engineering, Vol. 47, No. 3, pp. 967-983.
9
Houlsby, A.C. (1990), Construction and design of cement grouting: a guide to grouting in rock foundations, John Wiley & Sons, New York, pp. 59-60.
10
10.Lee, H.B., Oh, T.M., Park, E.S., Lee, J.W., Kim, H.M. (2017), “Factors affecting waterproof efficiency of grouting in single rock fracture”, Geomechanics and Engineering, Vol. 12, No. 5, pp. 771-783.
11
Lee, J.S., Koh, K.T., Ahn, G.H., Kang, S.T., Kwon, S.H. (2016), “Effects of diameter of cylinder and the number of strand on the bleeding of cement paste”, Journal of the Korean Recycled Construction Resources Institute, Vol. 4, No. 1, pp. 38-46.
12
Massoussi, N., Keita, E., Roussel, N. (2017), “The heterogeneous nature of bleeding in cement pastes”, Cement and Concrete Research, Vol. 95, pp. 108-116.
13
Owino, J.O., Jacobs, L.J. (1999), “Attenuation measurements in cement-based materials using laser ultrasonics”, Journal of Engineering Mechanics, Vol. 125, No. 6, pp. 637-647.
14
Pelletier, L., Winnefeld, F., Lothenbach, B. (2010), “The ternary system Portland cement–calcium sulphoaluminate clinker–anhydrite: hydration mechanism and mortar properties”, Cement and Concrete Composites, Vol. 32, No. 7, pp. 497-507.
15
Shirlaw, J.N., Kay, W., Venu. P. (2014), “Rock fissure grouting in Singapore granite for building protection during station construction”, Proceedings of the eighth International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground, Seoul, pp. 375-380.
16
Wang, H., Ge, M. (2008), “Acoustic emission/microseismic source location analysis for a limestone mine exhibiting high horizontal stresses”, International Journal of Rock Mechanics and Mining Sciences, Vol. 45, No. 5, pp. 720-728.
17
You, K.H., Jie, H.K., Seo, K.W., Kim, S.J., You, D.W. (2012), “A study on the correlation between the rock mass permeability before and after grouting & injection volume and the parameters of Q system in a jointed rock mass tunnel”, Journal of Korean Tunnelling and Underground Space Association, Vol. 14, No. 6, pp. 617-635.
18
Young, R.P., Collins, D.S. (2001), “Seismic studies of rock fracture at the Underground Research Laboratory, Canada”, International Journal of Rock Mechanics and Mining Sciences, Vol. 38, No. 6, pp. 787-799.
Information
  • Publisher :Korean Tunneling and Underground Space Association
  • Publisher(Ko) :한국터널지하공간학회
  • Journal Title :Journal of Korean Tunnelling and Underground Space Association
  • Journal Title(Ko) :한국터널지하공간학회 논문집
  • Volume : 19
  • No :4
  • Pages :635-650
  • Received Date : 2017-06-30
  • Revised Date : 2017-07-24
  • Accepted Date : 2017-07-28
  • DOI :https://doi.org/10.9711/KTAJ.2017.19.4.635
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