Study on appropriate support system and control criteria for main roadway under weak geological conditions in Indonesia

Takashi Sasaoka, Pongpanya Phnthoudeth, Akihiro Hamanaka, Hideki Shimada, Hiroshi Takamoto, Jiro Oya

研究成果: 書籍/レポート タイプへの寄稿会議への寄与

抄録

Indonesia is the second largest coal exporter to Japan, accounting for about 30 Mt annually. They produced over 400 Mt in 2015, over 99% of which is from open-cut mines. However, the conditions of surface mining are becoming worse year by year: the stripping ratio is increasing, the economy is worsening, and the infrastructure for coal transportation from inland mining areas is not being maintained. To meet the demand for coal in Indonesia and the rest of the world, underground mines have to be developed. In consideration of growing need, our research program is conducting a study on the potential for an underground coal mine in Indonesia. This research is being done through the roadway heading research program, which is looking into developing an underground coal mine from an open pit highwall. The greatest challenge for underground coal mine development in Indonesia is the maintaining the safety of the mine roadway during heading because the roof rock is exceptionally weaker. There is a potential for heading below mobile, unconsolidated soft sediment, and instead mining a deep area. This increases the likelihood for problems in the stability of the support system due to increasing ground pressure. The ground behavior around the roadway was measured using telltales, extensometers, and convergence measurements. Moreover, rock property tests were also conducted on exploration drilling cores. Based on the geological dates and monitoring data, a series of numerical analyses were conducted in order to assess support needs in the main roadway under different depths. Results of numerical analyses indicate that the current arch support design is effective when the mining depth is lower than 100m. However, if the mining depth is larger than 100m, the current arch support design should be changed to include the application of higher yield strength material, shorter spacing, etc. Moreover, bolting may also be useful if ground pressure is high locally. Based on a series of measurement data of ground and support behavior, a control criterion for main roadways under weak geological conditions is proposed in this paper.

本文言語英語
ホスト出版物のタイトルProceedings of the 36th International Conference on Ground Control in Mining, ICGCM 2017
編集者Michael Murphy, Brijes Mishra, Kyle Perry, Heather Lawson
出版社Society for Mining, Metallurgy and Exploration (SME)
ページ220-230
ページ数11
ISBN(電子版)9780873354561
出版ステータス出版済み - 1月 1 2017
イベント36th International Conference on Ground Control in Mining, ICGCM 2017 - Morgantown, 米国
継続期間: 7月 25 20177月 27 2017

出版物シリーズ

名前Proceedings of the 36th International Conference on Ground Control in Mining, ICGCM 2017

会議

会議36th International Conference on Ground Control in Mining, ICGCM 2017
国/地域米国
CityMorgantown
Period7/25/177/27/17

!!!All Science Journal Classification (ASJC) codes

  • 地球化学および岩石学

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