A study on the change of strength parameters reinforced rock bolt in the ground around tunnel

Sang-Hwan* Kim; Gyu-Min Bang

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2005 Vol.7, Issue 1 Preview Page Next Page

A study on the change of strength parameters reinforced rock bolt in the ground around tunnel 록볼트로 보강된 터널주변지반의 강도정수 변화에 대한 연구

31 March 2005. pp. 51-61

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Abstract

In general the strength parameter of the ground will be changed by reinforcing the ground around tunnel. In this case, the concept of tunnel design, such as supporting system, excavation, lining and so on, should be modified based on the failure criteria of the ground changed by the reinforcement. This paper presents the variation mechanism of strength parameters and new failure criteria of the reinforced ground. In order to perform this research, theoretical and experimental works were carried out. It was clearly founded that the cohesion of strength parameters is only increased by reinforcement of ground, especially by rock bolting.

Keywords

Strength parameter

reinforced ground behavior

simple tunnel support/reinforcement design system

new failure criteria

rock bolt

터널의 주변지반을 보강할 경우 지반의 강도정수는 변화한다. 그러므로 보강된 터널주변지반의 지보, 보조 및 보강, 굴착설계 시 보강된 주변지반의 강도기준에 대하여 고려하여야 할 것이다. 따라서 본 논문에서는 터널의 주변지반을 보강할 경우 터널주변지반의 복합거동에 대한 연구로써 간편 터널 지보/보강 설계법과 보강된 주변지반의 강도정수변화에 대하여 이론적 및 실험적으로 연구하였으며, 또한 터널주변 강도정수 변화 결과에 따른 복합항복함수에 대해서도 제시하였다. 연구결과, 록볼트의 경우에는 터널주변지반의 내부마찰각의 증가보다는 점착력의 증가에 많은 영향을 준다는 것을 알 수 있었다.

키워드

강도정수

복합지반거동

간편 터널 지보/보강 설계법

복합항복함수

록볼트

References

1. Bischoff, J.A, Smart, J.D, (1975), A method of computing a rock reinforcement system which is structurally equivalent to an internal support system. proc. of the 16th US Symp. on Rock Mechanics., pp. 114～119.

2. Bjurstrom, S., (1973). Bergbultforband isprucket berg. Fortifikationsforvaltningen, Forskningsbyran, Rapprot nr 121:3, Stockholm. (in swedish).

3. Dulacska, H., (1972). Dowel action of reinforcement crossing cracks in concrete. J. of the Am. concrete Inst., Proc., Vol. 69, No. 12, pp. 754～ 757.

4. Gerrard. C. M., (1983), Rock bolting in theory, Paper to be presinted to the Int. Symp. on Rock Bolting, Abisco, Sweden , Sept.

5. Pande, G. N. and Gerrard, C. M., (1983), The behaviour of reinforced jointed rock masses under various simple loading states, Proc. Fifth Congr. Int. Soc. for Rock Mech. Melbourne, pp. F217～F223.

6. Abdi, R., de Buhan, P. and Pastor, J., (1994). “Calculation of the critical height of a homo-genized reinforce soil wall: A numerical approach.” I. J. Num. & Anal. Meth. Geomech., Vol. 18, pp. 485～ 505.

7. Hausmann, M. R., (1990). Engineering principles of ground modification, McGrow-Hill.

8. American Society for Testing and Materials (1994). Annual Book of ASTM Standards, Vol. 04.08, Philadelphia. Pa.

Information

Publisher :Korean Tunneling and Underground Space Association
Publisher(Ko) :한국터널지하공간학회
Journal Title :Journal of Korean Tunnelling and Underground Space Association
Journal Title(Ko) :한국터널지하공간학회 논문집
Volume : 7
No :1
Pages :51-61

Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

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