1. 1) Japan coal energy center, “Kouwan kouji ni okeru sekitanbai kongou zairyou no yuukouriyou gaidorain” (2011).
2. 2) Public works research center, “Kensetsu hasseido riyou gijyutsu manyualu”, pp.27-34 (1997).
3. 3) N. Nakajima, S. Yokota, H. Kuroyama, K. Sasabe and Y. Oiki, “The application of rotary crushing mixture (twister) method to geo-environmental field”, Proceedings of the Seventh National Symposium on Ground Improvement, pp.159-162 (2006).
4. 4) Y. Kikuchi, T. Mizutani, T. Nagatome and T. Hatal, “Study on applicability of micro-focus x-ray CT scanner for geomaterials”, technical note of the port and airport research institute, No.1125 (2006).
5. 5) Public works research institute, “Kensetsu odei saisei riyou-manyualu”, pp.214-216 (2003).