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Effect of Rock Mass Condition on the Earth Pressure Against an Excavation Wall in Rock Mass: Numerical Investigation

암반지층 굴착벽체 작용토압에 대한 암반조건의 영향: 수치해석적 조사

Moorak Son1*
,
Solomon Adedokun2
손 무락1*
,
1Prof., Dept. of Civil Engrg., Daegu Univ.
2Former Graduate Student, Dept. of Civil Engrg., Daegu Univ.
*교신저자. *Corresponding Author. 
30 November 2017. pp. 83-95
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Abstract

This study examined the magnitude and distribution of earth pressure on the excavation wall in jointed rock mass by considering different groundwater conditions under various rock types, joint inclination angles, and earth pressure coefficients. Based on a physical model test (Son and Park, 2014), extended studies were conducted considering rock-structure interactions based on the discrete element method, which can consider the joints characteristics of rock mass. The results showed that the earth pressure was highly influenced by the groundwater condition as well as the rock type, joint inclination angle, and earth pressure coefficient. The results were also compared with Peck’s earth pressure for soil ground, and clearly showed that the earth pressure in jointed rock mass can be greatly different from that in soil ground.

Keywords
Rock excavation
Excavation wall
Earth pressure
Groundwater
Earth pressure coefficient
Rock type
Joint inclination angle
Rock-structure interaction

본 연구는 절리가 형성된 암반지층에서 암석종류, 절리경사각, 토압계수 및 지하수조건을 달리할 때 굴착벽체에 발생하는 토압의 크기 및 분포에 대해서 조사하였다. 모형실험(Son and Park, 2014)에 근거하여 확장연구를 수행하였으며, 이 때 암반-구조 상호작용과 암반의 절리특성을 고려하기 위하여 개별요소법을 이용한 수치해석을 수행하였다. 본 연구로부터 굴착벽체에 작용하는 토압은 암석종류, 절리경사각 및 토압계수 뿐만 아니라 지하수조건에 의해서 크게 영향을 받는다는 것을 파악하였다. 이와 더불어 본 연구로부터 조사된 토압을 토사지반에 적용되는 Peck의 경험토압과 비교하였으며, 이를 통해 절리형성 암반지층 굴착벽체에 발생하는 토압은 토사지반에서 발생하는 토압과 크게 다를 수 있다는 것을 확인하였다.

References
1
Chae, Y. S. and Moon, I. (1994), “Earth Pressure on Retaining Wall by Considering Local Soil Condition”, Korean Geotechnical Society, ’94 Fall conference paper, pp.129-138.
2
Jeong, E. T. and Kim, S. G. (1997), “Case Study of Earth Pressure Distribution on Excavation Wall of Multi-layered Soil”, Korean Geotechnical Society, ’97 spring conference paper, pp. 78-80.
3
Peck, R.B. (1969), “Deep Excavations and Tunneling in Soft Ground. State-of-the-Art report”, Proceedings of the 7th International Conference on Soil Mechanics and Foundation Engineering, Mexico City, State-of-the Art Volume, pp.225-290.
4
Son, M. (2013), “Earth Pressure on the Support System in Jointed Rock Mass”, Canadian Geotech. Journal, Vol.50, No.5, pp.493-502.
5
Son, M. and Adedokun, S. (2015), “Effect of Support Characteristics on the Earth Pressure in a Jointed Rock Mass”, Canadian Geotech. Journal, Vol.52, pp.1-12.
6
Son, M., Adedokun, S., and Hwang, Y. (2015), “Effect of the Earth Pressure Coefficient on the Support System in Jointed Rock Mass”, Journal of the Korean-Geoenvironmental Society, Vol. 16, No.2, pp.33-43.
7
Son, M. and Park, J. (2014), “Physical Model Test and Numerical Simulation of Excavation Wall in Jointed Rock Mass”, Canadian Geotech. Journal, Vol.51, No.5, pp.554-569.
8
Son, M. and Yoon, C. (2011), “Characteristics of the Earth Pressure Magnitude and Distribution in a Jointed Rockmass”, Journal of Korean Society of Civil Engineers, Vol.31, No.6, pp.203-212.
9
Tschebotarioff, G. P. (1973), Foundations, Retaining and Earth Structures. 2nd Ed., MGH.
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Universal Distinct Element Code, UDEC (2004), User’s Manual, Itasca Consulting Group, Inc., Minneapolis, Minnesota, U.S.A
11
Yoo, C. S. and Kim, Y. J. (2000), “Deep Excavation in Soil, Including Rock with Layers on Retaining Wall and Apparent Horizontal Displacement of Earth Pressure”, Journal of Korean Geotechnical Society, Vol.16, No.4, pp.43-50.
Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 33
  • No :11
  • Pages :83-95
  • Received Date : 2017-09-27
  • Revised Date : 2017-11-13
  • Accepted Date : 2017-11-14
  • DOI :https://doi.org/10.7843/kgs.2017.33.11.83
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