Surface subsidence induced by underground coal mining in Indonesia

H. Takamoto, J. Oya, Takashi Sasaoka, Hideki Shimada, K. Matsui

Research output: Contribution to specialist publicationArticle

Abstract

The following are summarised by the analysis of subsidence at line 1 and line 2: 1) The time for reaching the complete subsidence of longwall mining in the area in Indonesia meets the cases dependent on the depth of cover in Japan. It is considered that this match is caused by similar longwall width and weak rocks on the roof which falls soon after longwall passes. 2) Limit angle: the measured data show 34° at line1 and 55° degree at line 2. It is known that in general subsidence having weak rocks overburden has bigger limit angle. It is hard to be acceptable that subsidence at line 1 has 34°, considering very small rock strength, e g UCS 1-4 Mpa. Thus, it is considered that subsidence at line 1 was affected by the gob of room and pillar mining which was made before starting longwall mining. It is expected that the limit angle of the subsidence in the area has around 55° like line 2, similar with it in Japan and UK. 3) Subsidence profile: since the subsidence at the centre of the panel at both line 1 and line 2 could not be measured from the beginning of the longwall mining, the predictions of the profile were made by several methods. However, the predicted profile could not be verified due to a lack of the most important subsidence data of the centre of the panel. Whether the NCB model can be applied to the subsidence in Indonesia should be examined by accumulating the subsidence data through mining practices in future.

Original languageEnglish
Pages37-41
Number of pages5
Volume261
No.5
Specialist publicationCoal International
Publication statusPublished - Sep 2013

Fingerprint

Subsidence
coal mining
Coal mines
subsidence
Longwall mining
longwall mining
weak rock
Rocks
Room and pillar mining
pillar
overburden
Roofs
roof

All Science Journal Classification (ASJC) codes

  • Fuel Technology
  • Geotechnical Engineering and Engineering Geology
  • Energy Engineering and Power Technology
  • Mechanical Engineering

Cite this

Surface subsidence induced by underground coal mining in Indonesia. / Takamoto, H.; Oya, J.; Sasaoka, Takashi; Shimada, Hideki; Matsui, K.

In: Coal International, Vol. 261, No. 5, 09.2013, p. 37-41.

Research output: Contribution to specialist publicationArticle

@misc{a4b4801c83f44df39bd0bf29de25ff09,
title = "Surface subsidence induced by underground coal mining in Indonesia",
abstract = "The following are summarised by the analysis of subsidence at line 1 and line 2: 1) The time for reaching the complete subsidence of longwall mining in the area in Indonesia meets the cases dependent on the depth of cover in Japan. It is considered that this match is caused by similar longwall width and weak rocks on the roof which falls soon after longwall passes. 2) Limit angle: the measured data show 34° at line1 and 55° degree at line 2. It is known that in general subsidence having weak rocks overburden has bigger limit angle. It is hard to be acceptable that subsidence at line 1 has 34°, considering very small rock strength, e g UCS 1-4 Mpa. Thus, it is considered that subsidence at line 1 was affected by the gob of room and pillar mining which was made before starting longwall mining. It is expected that the limit angle of the subsidence in the area has around 55° like line 2, similar with it in Japan and UK. 3) Subsidence profile: since the subsidence at the centre of the panel at both line 1 and line 2 could not be measured from the beginning of the longwall mining, the predictions of the profile were made by several methods. However, the predicted profile could not be verified due to a lack of the most important subsidence data of the centre of the panel. Whether the NCB model can be applied to the subsidence in Indonesia should be examined by accumulating the subsidence data through mining practices in future.",
author = "H. Takamoto and J. Oya and Takashi Sasaoka and Hideki Shimada and K. Matsui",
year = "2013",
month = "9",
language = "English",
volume = "261",
pages = "37--41",
journal = "Coal International",
issn = "1357-6941",
publisher = "Tradelink Publications Ltd.",

}

TY - GEN

T1 - Surface subsidence induced by underground coal mining in Indonesia

AU - Takamoto, H.

AU - Oya, J.

AU - Sasaoka, Takashi

AU - Shimada, Hideki

AU - Matsui, K.

PY - 2013/9

Y1 - 2013/9

N2 - The following are summarised by the analysis of subsidence at line 1 and line 2: 1) The time for reaching the complete subsidence of longwall mining in the area in Indonesia meets the cases dependent on the depth of cover in Japan. It is considered that this match is caused by similar longwall width and weak rocks on the roof which falls soon after longwall passes. 2) Limit angle: the measured data show 34° at line1 and 55° degree at line 2. It is known that in general subsidence having weak rocks overburden has bigger limit angle. It is hard to be acceptable that subsidence at line 1 has 34°, considering very small rock strength, e g UCS 1-4 Mpa. Thus, it is considered that subsidence at line 1 was affected by the gob of room and pillar mining which was made before starting longwall mining. It is expected that the limit angle of the subsidence in the area has around 55° like line 2, similar with it in Japan and UK. 3) Subsidence profile: since the subsidence at the centre of the panel at both line 1 and line 2 could not be measured from the beginning of the longwall mining, the predictions of the profile were made by several methods. However, the predicted profile could not be verified due to a lack of the most important subsidence data of the centre of the panel. Whether the NCB model can be applied to the subsidence in Indonesia should be examined by accumulating the subsidence data through mining practices in future.

AB - The following are summarised by the analysis of subsidence at line 1 and line 2: 1) The time for reaching the complete subsidence of longwall mining in the area in Indonesia meets the cases dependent on the depth of cover in Japan. It is considered that this match is caused by similar longwall width and weak rocks on the roof which falls soon after longwall passes. 2) Limit angle: the measured data show 34° at line1 and 55° degree at line 2. It is known that in general subsidence having weak rocks overburden has bigger limit angle. It is hard to be acceptable that subsidence at line 1 has 34°, considering very small rock strength, e g UCS 1-4 Mpa. Thus, it is considered that subsidence at line 1 was affected by the gob of room and pillar mining which was made before starting longwall mining. It is expected that the limit angle of the subsidence in the area has around 55° like line 2, similar with it in Japan and UK. 3) Subsidence profile: since the subsidence at the centre of the panel at both line 1 and line 2 could not be measured from the beginning of the longwall mining, the predictions of the profile were made by several methods. However, the predicted profile could not be verified due to a lack of the most important subsidence data of the centre of the panel. Whether the NCB model can be applied to the subsidence in Indonesia should be examined by accumulating the subsidence data through mining practices in future.

UR - http://www.scopus.com/inward/record.url?scp=84887219174&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84887219174&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:84887219174

VL - 261

SP - 37

EP - 41

JO - Coal International

JF - Coal International

SN - 1357-6941

ER -