한국지반공학회논문집 (Journal of the Korean Geotechnical Society)

한국지반공학회 (Korean Geotechnical Society)
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절리형성 암반지층 굴착벽체에 작용하는 토압에 대한 절리군의 영향

Effect of Joint Sets on the Earth Pressure against the Support System in a Jointed Rock Mass

  • 투고 : 2015.10.07
  • 심사 : 2015.12.09
  • 발행 : 2015.12.31
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초록

본 연구는 절리형성 암반지층 굴착벽체에 작용하는 토압에 대한 암반종류 및 절리조건 (전단강도 및 절리경사각)뿐만아니라 절리군의 수에 대한 영향을 조사하였다. 모델실험 및 그에 대한 시뮬레이션결과를 토대로 다양한 수치해석적 매개변수연구가 수행되었다. 해석결과, 굴착벽체에 발생하는 토압은 절리군에 포함된 절리경사각에 큰 영향을 받았지만, 절리군의 수 자체만으로는 토압에 큰 영향을 주지는 않았다. 연구결과는 또한 토사지반에서의 토압인 Peck 토압과 상호 비교되었으며, 이를 통해 절리가 형성된 암반지층 굴착벽체에 발생하는 토압은 토사지반에서 발생하는 토압과 크게 다를 수 있다는 것을 파악하였다. 본 연구를 통해서 향후 암반지층에 설치되는 굴착벽체 설계시 적용하는 토압은 암반종류 및 절리조건과 더불어 절리군에 포함된 절리경사각을 고려하여 산정해야 할 것으로 판단된다.

This study examined the magnitude and distribution of earth pressure on the support system in a jointed rock mass due to the different joint sets as well as varying the rock type and joint condition (joint shear strength and joint inclination angle). Based on a physical model test and its numerical simulation, a series of numerical parametric analyses were conducted using a discrete element method. The results showed that the induced earth pressure was affected significantly by a joint set depending on the inclusion of the joint inclination angle, which induces a joint sliding condition, but the number of joint sets alone was not important, even though the earth pressure could be increased slightly as the number of joint sets is increased. In addition, the study results were compared with Peck's earth pressure for soil ground, which indicated that the earth pressure in a jointed rock mass could be considerably different from that in soil ground. The study suggests that the effects of joint sets as well as rock type and joint condition are important factors affecting the earth pressure in a jointed rock mass and they should be considered when designing a support system in a jointed rock mass.

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참고문헌

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