A Study on the Stratum Thickness Arrangement and Roof Bolt Support Design using Robust Design

Myoung Hwan Jang

doi:10.7474/TUS.2018.28.2.14

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Case Study

A Study on the Stratum Thickness Arrangement and Roof Bolt Support Design using Robust Design 강건설계를 이용한 층서두께 배열과 루프볼트 지보설계에 관한 연구

27 April 2018. pp. 142-155

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Abstract

The OO mine has irregularly developed stratum around the ore body. The purpose of this study is to array irregular stratum thickness systematically for effective roof bolting and to implement a supporting system corresponding to it. The number of 81 cases combined with stratum thicknesses was limited to 9 cases by robust design. For each case, the load height which can act as a roof load was determined by the characteristics of stratum and RMR. The load range due to the load height is calculated assuming block shaped and arch shape. The support load of the roof bolt was considered as the average load of the two methods. Numerical analysis results of the support design showed that the cable bolt was more effective for the roof supporting fully grouted than the anchoring type. As a result of the construction, it was possible to control the roof, but all of the roof was gradually sinking downward due to the deformation of the side wall of the mine tunnel.

Keywords

Roof bolt

Stratum thickness

Robust design

Roof load

Fully grouted

OO광산은 광체주변에 미고결된 층서가 불규칙하게 발달되어 있다. 본 연구는 효율적인 루프볼트(roof bolt) 시공을 위하여 불규칙한 층서의 두께를 체계적으로 배열하고 이에 대응하는 지보시스템을 제시한 것이다. 층서별 두께를 조합한 81개의 경우의 수를 강건설계에 의하여 9개의 사례로 한정하여 지보설계를 하였다. 각 사례에 대하여 천반하중으로 작용할 수 있는 하중고를 층서의 특성과 RMR에 의하여 결정하였다. 하중고에 의한 하중범위를 블록형상과 아치형상으로 가정하여 계산하였다. 두 방법의 평균하중으로 루프볼트의 지보력을 감안한 지보설계를 하였다. 지보설계에 대한 수치해석 결과 케이블 볼트는 선단정착 방식보다 전면접착 방식이 천반유지에 더 효과적인 것으로 분석되었다. 시공결과 천반의 컨트롤은 가능하였으나 갱도측벽의 변형으로 천반 전체가 하부로 조금씩 침강하는 현상을 보였다.

키워드

루프볼트

층서두께

강건설계

천반하중

전면접착

References

Klein, S., 2001, An Approach to the classification of weak rock for tunnel projects, 2001 RETC proceedings, 793-805.

Madhav S. P., 1989, Quality Engineering Using Robust Design, 334p.

Dennis R. Dolinar1 and Lewis A. Martin, 2000, Cable Support in Longwall Gate Roads; Proceedings; New Technology for Coal Mine Roof Support, CDC Stacks, 165-191.

Simpson T.W., 2001, Taguchi’s Robust Design Method, IE 466-Concurrent Engineering, 9p.

Ceballos F., Olalla C., Jiménez R., 2014, Relationship between RMR and GSI based on in situ data, EUROCK 2014, 375-380.

Ünal E., 1984, Empirical approach to calculate rock loads in coal mine roadways, Proceedings of the Fifth International Conference on Ground Control in Mining, Morgantown, 232-246.

Information

Publisher :Korean Society for Rock Mechanics and Rock Engineering
Publisher(Ko) :한국암반공학회
Journal Title :Tunnel and Underground Space
Journal Title(Ko) :터널과 지하공간
Volume : 28
No :2
Pages :142-155
Received Date : 2018-03-09
Revised Date : 2018-04-09
Accepted Date : 2018-04-10
DOI :https://doi.org/10.7474/TUS.2018.28.2.14

Tunnel and Underground Space ISSN:1225-1275(Print) 2287-1748(Online) 터널과 지하공간

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