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Effect of Step-Wise Excavation Depth on the Earth Pressure against an Excavation Wall in Rock Mass

암반지층 굴착벽체 발생토압에 대한 단계별 굴착깊이의 영향

Moorak Son1*
,
Solomon Adedokun2
손 무락1*
,
아데도쿤 솔로몬2
1Prof., Dept. of Civil Engrg., Daegu Univ.
2Graduate Student, Dept. of Civil Engrg., Daegu Univ.
1대구대학교 토목공학과 교수
2대구대학교 토목공학과 박사과정
*교신저자. *Corresponding Author. 
28 February 2014. pp. 43-52
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Abstract

This paper examined the effect of step-wise excavation depth on the earth pressure against an excavation wall in rock mass. Numerical parametric studies were conducted based on the Discrete Element Method (DEM) to carry out the problems in rock mass. Controlled parameters included step-wise excavation depth, rock types, and joint conditions (joint shear strength and joint inclination angle). The magnitude and distribution characteristics of the induced earth pressure in a jointed rock mass were investigated and compared with Peck's earth pressure for soil ground. The results showed that the earth pressure against an excavation wall in rock mass were highly affected by different rock and joint conditions, and the effect of step-wise excavation depth increased as a rock type is deteriorated more. In addition, it was found that the earth pressure against an excavation wall in rock mass might be considerably different from Peck's empirical earth pressure for soil ground.

Keywords
Rock excavation
Earth pressure
Step-wise excavation
Rock type
Joint condition

본 논문은 암반지층에 설치되는 굴착벽체에 발생하는 토압에 대한 단계별 굴착깊이의 영향을 조사한 것이다. 암반지층에서 발생하는 문제들을 다루기 위해 개별요소법에 근거한 수치해석적 매개변수해석을 수행하였다. 수치해석은 매개변수로서 단계별 굴착깊이, 암반종류 및 절리조건(절리면의 전단강도 및 절리경사각)을 고려하였다. 암반지층에서 발생된 토압과 토사지반에서의 경험토압인 Peck토압이 서로 비교되었다. 비교결과 암반지층에서 발생된 토압은 암반의 종류 및 절리조건에 따라서 크게 영향을 받았으며, 단계별 굴착깊이의 영향은 암반상태가 나빠질수록 증가하는 것으로 나타났다. 더불어, 암반지층에 설치된 굴착벽체에 발생하는 토압은 토사지반에 대한 Peck의 경험토압과는 크게 다를 수 있다는 결과를 얻었다.

References
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13
Received : September 27th, 2013
14
Revised  : November 19th, 2013
15
Accepted : February 3rd, 2014
Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 30
  • No :2
  • Pages :43-52
  • Received Date : 2013-09-27
  • Revised Date : 2013-11-19
  • Accepted Date : 2014-02-03
  • DOI :https://doi.org/10.7843/kgs.2014.30.2.43
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