Evaluation of the blast-restriction zone to secure tunnel lining safety

터널라이닝 안전관리를 위한 발파제한영역 평가

  • Published : 2009.03.27

Abstract

In urban areas, blast excavation adjacent to tunnels is carried out frequently. It is generally required to secure static and dynamic stability of nearby tunnel structures for any such activities. Although there is some national guidelines for static safety, there is little guides to risk zoning controling the dynamic behavior of the underground structures. In this study, impacts on the blast-induced vibration are investigated using numerical study. An attempt to define the restricted area of blast adjacent to subway tunnels was also made. Particular concerns were given to tunnel depth and ground types. By carrying out the parametric study on depth and ground patterns, the envelope of blast distance of which dynamic response on the lining is controlled under 1 cm/sec, is established. It is shown that the increase in depth has increased the required safety distance slightly until the distance of 3.5 times of the tunnel diameter. Despite small changes in safety distance, it can be generally said that the effects of depth and stiffness of the ground is not significant in controlling the particle velocity of the tunnel linings.

References

  1. Lysmer. J. and Wass, G. (1972), "Shear waves in plane infinite surface", Journal of the Engineering Mechanics Division, ASCE, Vol. 98, No.1, pp. 351-358.
  2. Starfield, A. M. and Pugliese, J.M. (1968), Compression waves generated in rock by cylindrical explosive charge: a comparison between a computer model and field measurements. Int. J. Roek Mech. Min. Sci. 5, pp. 65-77. https://doi.org/10.1016/0148-9062(68)90023-5
  3. 서울지하철 건설본부 (2008), "서울지하철 지반조사 보고서".
  4. 문훈기, 신종호 (2008), "발파진동이 터널구조물에 미치는 영향", 한국터널공학회논문집, Vol. 10, No.3, pp.207.219.
  5. Siskind. D. E. (2000), Vibrations from blasting, International Society of Explosive Engineers. Cleveland, OH (USA).