Proposal of the Unsupported Span of Openings in the Domestic Underground Limestone Mines

Choon Sunwoo

doi:10.7474/TUS.2018.28.4.358

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2018 Vol.28, Issue 4 Preview Page Next Page

Original Article

Proposal of the Unsupported Span of Openings in the Domestic Underground Limestone Mines 국내 지하 석회석광산 갱도의 무지보 폭을 위한 제안

31 August 2018. pp. 358-371

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Abstract

The stability of openings in the underground mine is major concern in the operation of mines that must ensure productivity and safety. Among many rock conditions affecting cavities stability, the width and height of the opening is an important design factor. In this paper, we consider to determine the maximum unsupported span of a opening in a limestone mine by using the Q system among several rock classification schemes. In order to determine the span of the unsupported opening in the limestone mine, rock mass classifications were carried out at over 200 sites in the underground limestone mines. The relationships by using the Q system and the stability graph proposed by Mathews to determine the maximum span of the unsupported opening were derived and compared. We propose a new classification method that combines GSI and RMR rock classification systems to make it easy to use in a field.

Keywords

Critical span

Stability graph method

Rock mass classification

Q system

Stability of underground opening

지하광산에서 갱도나 공동의 안정성은 생산성과 안전을 확보해야 하는 광산운영에 있어서 가장 중요한 관심사이다. 공동의 안정성에 영향을 주는 많은 암반조건 중 공동의 폭과 높이는 중요한 설계요소가 된다. 이 논문의 주된 목적은 암반분류법 중에 Q시스템을 이용하여 무지보로 유지할 수 있는 최대 무지보 갱도 폭을 국내 석회석 광산현장에서 용이하게 결정하기 위한 것이다. 국내 석회석 광산에서 무지보갱도 규격에 대한 고찰을 위해 여러 석회석 지하광산 200여개의 측점에서 암반분류 측정이 이루어졌다. Q 시스템을 이용한 무지보 갱도폭을 결정하는 관계식과 안정성 그래프법을 이용한 최대 무지보 갱도 폭을 결정하는 관계식을 유도하여 비교검토가 이루어졌다. 또한 현장에서 사용하기 쉽도록 GSI와 RMR을 결합한 새로운 방식의 분류법을 제안한다.

키워드

한계 갱도폭

안정성 그래프법

암반분류

Q 시스템

지하공동의 안정성

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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 :4
Pages :358-371
Received Date : 2018-07-11
Revised Date : 2018-08-03
Accepted Date : 2018-08-03
DOI :https://doi.org/10.7474/TUS.2018.28.4.358

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

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