1. |
Akihiro Hamanaka, Takashi Sasaoka, Hideki Shimada, Shinji Matsumoto, Evolution of Plant Growth with Mixture of Fly Ash to Acidic Soil for Rehabilitation of Disturbed Land in Open-cut Mines, 3rd International Symposium on Land Reclamation and Ecological Restoration, 2021.10. |
2. |
Akihiro Hamanaka, Yoshimitsu Makabe, Ken-ichi Itakura, Takashi Sasaoka, Hideki Shimada, Nuhindro Priagung Widodo, Budi Sulistianto, Gota Deguchi, Study on Generating Acoustic Emission with Heating Coal for Application as Monitoring System for Underground Coal Gasification, The 11th Asian Rock Mechanics Symposium, 2021.10. |
3. |
Akihiro HAMANAKA, Fa-qiang SU, Ken-ichi ITAKURA, Kazuhiro TAKAHASHI, Jun-ichi KODAMA, Gota DEGUCHI , Large-scale Laboratory Experiment on Development of Underground Coal Gasification with Horizontal Well , The 5th ISRM Young Scholars' Symposium on Rock Mechanics & International Symposium on Rock Engineering for Innovative Future, 2019.12, Underground coal gasification (UCG) is a technique to recover coal energy by the in-situ conversion of coal into gaseous products. In this study, an application of co-axial UCG system with a horizontal well is discussed by means of the model UCG experiment with a large-scale simulated coal seam which the size is 550 × 600 × 2,740 mm. A horizontal well which has 45 mm diameter is used as an injection/production well. The effect of injection rate is evaluated by using the results of gas compositions, temperature profile, and acoustic emission monitoring. During the experiment, the changes of temperature field and product gas compositions were observed by changing the position of an injection pipe, meaning that it is possible to control gasification area and the quality of product gas by controlling the injection position. Additionally, the increase of injection rate attribute to improve the calorific value of product gas while the higher flow rate may cause to move the gasification area rapidly when the coal with higher ash is gasified.. |
4. |
Akihiro HAMANAKA, Han Huor OENG, Kazuki MAEHARA, Takashi SASAOKA, Hideki SHIMADA, Toru SATO, Effects of Lubricants in Over-cutting Area of Pipe Roof Method on Reducing Surface Settlement, VCRES 2019 international symposium, 2019.11. |
5. |
Akihiro HAMANAKA, Hiroto YAMASAKI, Takashi SASAOKA, Hideki SHIMADA, Shinji MATSUMOTO, Application of Fly Ash to Acidic Soil to Improve Plant Growth in Disturbed Land of Open-cut Mining, 18th Symposium on Environmental Issues and Waste Management in Energy and Mineral Production, 2018.11, The amount of fly ash disposed as industrial wastes is increasing with increasing coal demands all over the world. Although fly ash is generally disposed by landfill, the demand of effective utilization of them is increasing because of the limitation of the disposal site. 80 % of coal ash is utilized such as a material for cements though less of them are disposed by landfill. Considering the preparation of landfill area and environmental issues, it is very meaningful to discuss the utilization of fly ash except a cement usage. Most of coal is mined by open-pit mining method in Indonesia. A broad post-mining area is built after the mining operation. The broad area has to be revegetated in terms of environmental conservation. However, soil acidification caused by mixing acid sulfate rocks or soils mined in the operation influences the revegetation. As the plant growth is inhibited under the acidic conditions, the utilization of fly ash which has higher neutralizing capacity due to its alkalinity is expected in order to improve the conditions of seedbed in the revegetation area. In this paper, the utilization of fly ash for preparation of seedbed in disturbed land in Indonesian open cut coal mine is discussed by means of laboratory pot trials by using simulated acidic soil with a mixture of pyrite, fly ash which has higher alkalinity, and Acacia mangium which is a typical species planted for fast growing tree in Indonesia. The results suggested that the appropriate mixture of fly ash to neutralize the acidic soil can be improved the plant growth under the acidic condition.. |
6. |
Akihiro HAMANAKA, Ken-ichi ITAKURA, Fa-qiang SU, Gota DEGUCHI, Jun-ichi KODAMA, Estimation of Gasification Area of Underground Coal Gasification by using Acoustic Emission Monitoring, 10th Asian Rock Mechanics Symposium, 2018.10. |
7. |
Akihiro HAMANAKA, Ken-ichi ITAKURA, Fa-qiang SU, Jun-ichi KODAMA, Gota DEGUCHI, Several Considerations on Application of Underground Coal Gasification (UCG) with High Efficiency and Safety, 25th World Mining Congress, 2018.06. |
8. |
Akihiro HAMANAKA, Ken-ichi ITAKURA, Fa-qiang SU, Kazuhiro TAKAHASHI, Kohki SATOH, Jun-ichi KODAMA, Gota DEGUCHI, Experimental Study on The Compact Underground Coal Gasification System with A Horizontal Well, 26th International Symposium on Mine Planning and Equipment Selection, 2017.08. |
9. |
Akihiro HAMANAKA, Ken-ichi ITAKURA, Faqiang SU, Gota DEGUCHI, Jun-ichi KODAMA, Application of Acoustic Emission Monitoring during Underground Coal Gasification, 2017 ISRM Young Scholars’ Symposium on Rock Mechanics (YSRM 2017) & 2017 International Conference on New Development in Rock Mechanics and Geotechnical Engineering (NDRMGE 2017), 2017.05. |
10. |
Akihiro HAMANAKA, Ken-ichi ITAKURA, Fa-qiang SU, Kazuhiro TAKAHASHI, Kohki SATOH, Yukio HAMA, Wenyan ZHANG, Jun-ichi KODAMA, Gota DEGUCHI, Field Underground Coal Gasification (UCG) Experiment: Trial 1, Joint Seminar on Environmental Science and Disaster Mitigation Research 2017, 2017.03. |
11. |
Akihiro HAMANAKA, Ken-ichi ITAKURA, Faqiang SU, Kazuhiro TAKAHASHI, Kouki SATOH, Gota DEGUCHI, and Jun-ichi KODAMA, Model Experiment for Co-axial Underground Coal Gasification System Development, 24th World Mining Congress (Sustainability in mining), 2016.10. |
12. |
Akihiro HAMANAKA, Ken-ichi ITAKURA, Faqiang SU, Gota DEGUCHI, Jun-ichi KODAMA, Underground coal gasification with monitoring technique by using acoustic emission, 6th International Symposium on Energy Challenges and Mechanics, 2016.08. |
13. |
Akihiro HAMANAKA, Ken-ichi ITAKURA, Faqiang SU, Numerical Simulation on Product Gas of Underground Coal Gasification Based on Laboratory Scale Experiment, First International Conference Mining in Europe, 2016.05. |
14. |
Akihiro HAMANAKA, Ken-ichi ITAKURA, Faqiang SU, Gota DEGUCHI, Preparation of Field Underground Coal Gasification (UCG) Test, Joint Seminar on Environmental Science and Disaster Mitigation Research 2016, 2016.03. |
15. |
Akihiro HAMANAKA, Ken-ichi ITAKURA, Faqiang SU, Kouki SATOH, Kazuhiro TAKAHASHI, Gota DEGUCHI, Jun-ichi KODAMA, Koutarou OHGA, Development of Compact Underground Coal Gasification (UCG) System as a Local Energy Resource, International Symposium on Earth Science and Technology 2015, 2015.12. |
16. |
Akihiro HAMANAKA, Hideki SHIMADA, Takashi SASAOKA, Yasuhiro YOSHIDA, Shuichi FUJITA, Material for construction of seabed structures using fly ash-surfactant mixtures, 23rd International Symposium on Mine Planning and Equipment Selection, 2015.11. |
17. |
Akihiro HAMANAKA, Hideki SHIMADA, Takashi SASAOKA, Study on method for minimizing soil erosion in open-cut mines in tropical regions, 34th International Conference on Ground Control in Mining (China 2015), 2015.10. |
18. |
Akihiro HAMANAKA, Hideki SHIMADA, Shunta OGATA, Takashi SASAOKA, Ikuo MIYAJIMA, Utilization of Coal Ash for Preparation of Seedbed in Disturbed Land in Indonesian Open Cut Coal Mine, 19th Conference on Environment and Mineral Processing, 2015.06. |
19. |
Akihiro HAMANAKA, Naoya INOUE, Hideki SHIMADA, Takashi SASAOKA, Kikuo MATSUI, Ikuo MIYAJIMA, Assessment of Soil Erosion at Rehabilitation Area in Tropical Regions Based on Laboratory Experiment, International Symposium on Earth Science and Technology 2014, 2014.12. |
20. |
Akihiro HAMANAKA, Amarsailhan TSEDENDORJ, Naoya INOUE, Takashi SASAOKA, Hideki SHIMADA, Kikuo MATSUI, Current Geotechnical Issues in Open Cut Mining in Desert Area in Mongolia, 33rd International Conference on Ground Control in Mining (China), 2014.10. |
21. |
Akihiro HAMANAKA, Naoya INOUE, Hideki SHIMADA, Takashi SASAOKA, Kikuo MATSUI, An Experimental Study for Assessment of Soil Erosion at Rehabilitation Area in Indonesian Coal Mine, Beijing International Symposium Land Reclamation and Ecological Restoration, 2014.10. |
22. |
Akihiro HAMANAKA, Naoya INOUE, Shinji NATSUMOTO, Hideki SHIMADA, Takashi SASAOKA, Kikuo MATSUI, Ikuo MIYAJIMA, Revegetation for Utilization of Disturbed Land by Paper Mulberry in Indonesian Open Cut Mine, 18th Conference on Environment and Mineral Processing, 2014.05. |
23. |
Akihiro HAMANAKA, Naoya INOUE, Hideki SHIMADA, Takashi SASAOKA, Kikuo MATSUI, Ikuo MIYAJIMA, Several Considerations on Soil Erosion at the Rehabilitation Area in Indonesian Coal Mine, International Symposium on Earth Science and Technology 2013, 2013.12. |
24. |
Akihiro HAMANAKA, Naoya INOUE, Hideki SHIMADA, Takashi SASAOKA, Kikuo MATSUI, Ikuo MIYAJIMA, Study on Backfilling of Soil for Revegetation at the Rehabilitation Area in Indonesian Coal Mine, 22nd Mine Planning and Equipment Selection, 2013.10. |
25. |
Akihiro HAMANAKA, Naoya INOUE, Hideki SHIMADA, Takashi SASAOKA, Kikuo MATSUI, Ikuyo MIYAJIMA, Fundamental Study on Revegetation of Post Mine Surface by Paper Mullberry in Open Cut Mine, 8th International Forum on Strategic Technology 2013, 2013.06. |
26. |
Akihiro HAMANAKA, Hideki SHIMADA, Takashi SASAOKA, Kikuo MATSUI, Shuichi FUJITA, Ikuo MIYAJIMA, Effect of Mixture Materials Using Waste Rock and Flyash for the AMD Prevention and Vegetation, 21st International Symposium on Mine Planning and Equipment Selection, 2012.11. |
27. |
Akihiro HAMANAKA, Hideki SHIMADA, Takashi SASAOKA, Kikuo MATSUI, Shuichi FUJITA, Ikuo MIYAJIMA, Effect of mixture materials using waste rock and flyash for the AMD prevention and vegetation, The 9th International Symposium on Novel Carbon Resource Science, 2012.11. |
28. |
Akihiro HAMANAKA, Sri MARYATI, Jin OKAZAKI, Hideki SHIMADA, Takashi SASAOKA, Kikuo MATSUI, The Experimental Study for Prediction of Soil Erosion in the Rehabilitation Area of Indonesia Coal Mine, International Symposium on Earth Science and Technology 2012, 2012.09. |
29. |
Akihiro HAMANAKA, Ginting Jalu KUSUMA, Candra NUGRAHA, Takashi SASAOKA, Hideki SHIMADA, Ikuo MIYAJIMA, Shuichi FUJITA, Kikuo MATSUI, Fundamental Study on Application of Paper Mulberry for Rehabilitation of Surface Coal Mine in Indonesia, International Symposium on Earth Science and Technology 2011, 2011.12. |
30. |
Akihiro HAMANAKA, Nay Zar LIN, Takashi SASAOKA, Hideki SHIMADA, Kikuo MATSUI, Hiroshi TAKAMOTO, Eco Underground Coal Mining Systems for Ultra-Thick Coal Seam - Utilisation of Flyash and CO2 Storage, 2nd International Future Mining Conference 2011, 2011.11. |
31. |
Akihiro HAMANAKA, Takashi SASAOKA, Hideki SHIMADA, Kikuo MATSUI, Hiroshi TAKAMOTO, Application of Punch Mining System to Indonesian Coal Mining Industry, 20th International Symposium on Mine Planning and Equipment Selection, 2011.10. |
32. |
Akihiro HAMANAKA, Takashi SASAOKA, Hideki SHIMADA, Kikuo MATSUI, Hiroshi TAKAMOTO, Pinyo MEECHUMNA, Pipat LAOWATTANABANDIT, Study on Applicable Highwall Mining System for Thick and Weak Coal Seams, 5th International Workshop and Conference on Earth Resources Technology, 2011.05. |
33. |
Akihiro HAMANAKA, Takashi SASAOKA, Hideki SHIMADA, Kikuo MATSUI, Hiroshi TAKAMOTO, Pinyo MEECHUMNA, Pipat LAOWATTANABANDIT, Application of Multi-Slicing Highwall Mining System with Stowing at Surface Coal Mine in Thailand, International Symposium on Earth Science and technology 2010, 2010.12. |
34. |
Akihiro HAMANAKA, Takashi SASAOKA, Hideki SHIMADA, Kikuo MATSUI, Hiroshi TAKAMOTO, Pinyo MEECHUMNA, Pipat LAOWATTANABANDIT, Application of Multi Slicing Highwall Mining System with Stowing at Surface Coal Mine at Thailand, 19th International Symposium on Mine Planning & Equipment Selection, 2010.12. |
35. |
Akihiro HAMANAKA, Takashi SASAOKA, Hideki SHIMADA, Kikuo MATSUI, Hiroshi TAKAMOTO, Pinyo MEECHUMNA, Pipat LAOWATTANABANDIT, Application of Highwall Mining System at Surface Coal Mine in Thailand, 29th International Conference on Ground Control in Mining, 2010.07. |
36. |
Akihiro HAMANAKA, Takashi SASAOKA, Hideki SHIMADA, Kikuo MATSUI, Hiroshi TAKAMOTO, Pinyo MEECHUMNA, Pipat LAOWATTANABANDIT, Application of Highwall Mining System at Surface Coal Mine in Thailand, 4th International Workshop and Conference on Earth Resources Technology, 2010.05. |