Numerical investigation on gate-entry stability of trial panel in indonesia longwall coal mine

Pisith Mao, Takashi Sasaoka, Hideki Shimada, Akihiro Hamanaka, Sugeng Wahyudi, Jiro Oya, Naung Naung

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

抄録

Indonesia is known for its abundant coal reserve. However, weak geological condition is one of the most common challenges in Indonesian coal mine. The study area of this research is PT Gerbang Daya Mandiri (GDM) mine which is situated in East Kalimantan. Stratigraphy of this area comprises of claystone as dominant rock and multiple coal seams with the thickness ranging from 0.15 m to 9.8 m. In this mine, the longwall mining method attempts to be applied for coal seam extraction. Recently, GDM begun their development of trial panel for depth around 100 m to 150 m to understand the behavior of the rock for the real longwall operation. Based on rock mechanical analysis of core sample from drill holes, the competence of claystone is increasing according to the depth. This analysis also shows that for the depth up to 100 m, claystone is generally weaker than coal. Thus, by leaving part of coal seam on top and bottom of the excavated entry-gate would help to retain its stability. For 150 m depth on the other hand, the competence of claystone is increased to somewhat similar to those of coal. This paper uses numerical simulation by FLAC3D to investigate the optimum remain coal thickness (RCT) for stability of the entry-gate of trial panel for 100 m depth. This work also seeks to identify appropriate roof support for both 100 m and 150 m depths. The outcome results show that the optimum RCT is 1 m on roof and on the floor for 100 m depth. SS540 with 1 m spacing is appropriated for adopting for this trial panel except the case of high stress ratio, which required stronger support capacity by narrowing the support spacing or incorporating rock bolt.

本文言語英語
ホスト出版物のタイトルProceedings of the 28th International Symposium on Mine Planning and Equipment Selection, MPES 2019
編集者Erkan Topal
出版社Springer
ページ499-507
ページ数9
ISBN(印刷版)9783030339531
DOI
出版ステータス出版済み - 2020
イベント28th International Symposium on Mine Planning and Equipment Selection, MPES 2019 - Perth, オーストラリア
継続期間: 12 2 201912 4 2019

出版物シリーズ

名前Springer Series in Geomechanics and Geoengineering
ISSN(印刷版)1866-8755
ISSN(電子版)1866-8763

会議

会議28th International Symposium on Mine Planning and Equipment Selection, MPES 2019
Countryオーストラリア
CityPerth
Period12/2/1912/4/19

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Mechanics of Materials

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