An Experimental Study on the Prediction of Progressive Cracking around Tunnel Fallout

터널 변상부 주변 진행성 예측에 관한 실험적 연구

  • Published : 2009.10.30


An estimation method of the fallout volume of a tunnel under construction is proposed based on an empirical method called bulking factor. For this, the main causes of the tunnel fallout are investigated and the scale of the fallout which is not accessible is considered. The calculated height of the fallout area is compared with borehole core data and the accuracy and efficiency of the proposed method is demonstrated. Another experimental approach on the detection of a progressive cracking around the tunnel fallout is provided based on an acoustic emission method. From the field tests near the tunnel fallout, it is shown that additional progressive cracking of the reinforced area is not foreseen and the effectiveness of the reinforcement is proven.


  1. 이희중, 정용복, 최성웅(2008), "지반침하 거동특성 분석을 위한 암반의 부피팽창률에 관한 연구," 터널과 지하공간, 제18권, pp.33-43
  2. Eberhardt, E.(1998), 'Brittle Rock Fractures and Progressive Damage in Uniaxial compression,' Ph.D.dissertation, University of Saskatchewan
  3. Eberhardt, E., Stead, D., Stmpson, B. (1999), "Quantifying progressive pre-peak brittle fracture damage in rock during uniaxial compression," Int. J. Rock Mech. Min. Sci., Vol. 36, No. 3, pp. 361-380
  4. Hong, J.S., Lee, H.S., Lee, D.H., Kim, H.Y., Choi, Y.T., Park, Y.J.(2006), "Microseismic event monitoring of highly stressed rock mass around underground oil storage cavens," Tunnelling & Underground Space Technology, No. 214
  5. Meglis, I.L., Chow, T.M., Young, R.P.(1995), "Progressive Microcrack Development in Terst on Lac du Bonnet Granite - I. Acoustic Emission Source Location and Velocity Measurements," International Journal of Rock Mechanics and Mining Sciences 32, pp. 741-750
  6. Yoshikawa, S., Mogi, K.(1981), "A new Method for Estimation of the Crustal Stress from cored Rock Samples: Laboratory study in the case of Uniaxial Compression," Technophysics, 74, pp. 323-339