ブックタイトル竹中技術研究報告書No70

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竹中技術研究報告書No70

TAKENAKA TECHNICAL RESEARCH REPORT No.70 2014竹中技術研究報告No.70 2014range, about one inch.3) The ratio of the load carried by the piles to the effective load in the tributary area of the instrumented piles (αp’), was foundto be quite stable after E.O.C. While the value ofαp’at the end of the observation varied from 0.43 to 0.93, it was foundthat the value ofαp’generally decreased as the pile spacing ratio was increased, as described in the previous paper(Yamashita et al., 2011a).ACKNOWLEDGEMENTSThe authors are grateful to Mr. T. Hashiba (Power Facilities Engineering Department), Mr. H. Ito (International Department),Messrs. H. Abe, H. Matsuzaki, H. Watanabe, Y. Yamaguchi and H. Nagaoka (Tokyo Main Office), Messrs. S. Yamamoto and H.Ikeda (Osaka Main Office) and Messrs. Y. Soga, K. Shimono, M. Yamada and T. Yokonami (Nagoya Branch Office) ofTakenaka Corporation for their contribution to the foundation design and the field monitoring.REFERENCES1）Poulos, H.G.: Piled raft foundations: design and applications, Geotechnique 51, No. 2, 95-113, 2001.2）Katzenbach, R., Arslan, U. and Moormann, C.: Piled raft foundation projects in Germany, Design applications of raftfoundations, Hemsley J.A. Editor, Thomas Telford, 323-392, 2000.3）Mandolini, A., Russo, G. and Viggiani, C.: Pile foundations: Experimental investigations, analysis and design, Proc. of the16th ICSMGE, Vol. 1, 177-213, 2005.4）Yamashita, K., Yamada, T. and Hamada, J.: Investigation of settlement and load sharing on piled rafts by monitoring fullscalestructures, Soils & Foundations, Vol. 51, No. 3, 513-532, 2011a.5）Yamashita, K., Hamada, J. and Yamada, T.: Field measurements on piled rafts with grid-form deep mixing walls on softground, Geotechnical Engineering Journal of the SEAGS & AGSSEA, Vol. 42, No. 2, 1-10, 2011b.6）Yamashita, K.: Field measurements on piled raft foundations in Japan, Proc. of the 9th Int. Conf. on Testing and DesignMethods for Deep Foundations: IS-Kanazawa 2012, 79-94, 2012.7）Mendoza, M.J., Romo, M.P., Orozco, M., Dominguez, L.: Static and seismic behavior of a friction pile-box foundation inMexico City clay, Soils & Foundations 40 (4), 143-154, 2000.8）Yamashita, K., Yamada, T. and Kakurai, M.: Simplified method for analyzing piled raft foundations, Proc. of the 3rd Int.Geotechnical Seminar on Deep Foundations on Bored and Auger Piles BAPⅢ, 457-464, 1998.9）Kakurai, M., Yamashita, K. and Tomono, M.: Settlement behavior of piled raft foundation on soft ground, Proc. of the 8thAsian Regional Conf. on SMFE, 373-376, 1987.10）Yamashita, K. and Kakurai, M.: Settlement behavior of the raft foundation with friction piles, Proc. of the 4th Int. Conf.on piling and Deep Foundations, 461-466, 1991.11）Yamashita, K., Kakurai, M. and Yamada, T.: Investigation of a piled raft foundation on stiff clay, Proc. of the 1 3th Int.Conf. on SMFE, Vol. 2, 543-546, 1994.12）Yamashita, K., Hashiba, T., Ito, H. and Tanikawa, T.: Performance of piled raft foundation subjected to strong seismicmotion, Geotechnical Engineering Journal of the SEAGS & AGSSEA, Vol. 45, No. 2, 33-39, 2014.13）Yamashita, K., Hamada, J., Onimaru, S. and Higashino, M.: Seismic behavior of piled raft with ground improvementsupporting a base-isolated building on soft ground in Tokyo, Soils & Foundations, Special Issue on Geotechnical Aspectsof the 2011 off the Pacific coast of Tohoku Earthquake, Vol. 52, No. 5, 1000-1015, 2012.14）Yamashita, K., Wakai, S. and Hamada, J.: Large-scale piled raft with grid-form deep mixing walls on soft ground, Proc. ofthe 18th ICSMGE, 2637-2640, 2013a.15）Yamashita, K., Hamada, J., Wakai, S. and Tanikawa, T.: Long-term monitoring of piled raft foundations with grid-formdeep mixing walls on soft ground, Takenaka Technical Research Report, No. 69, 29-44, 2013b.16）Kunugi, T., Aoi, S., Suzuki, W., Nakamura, H., Morikawa, N. and Fujiwara, H.: Strong motions of the 2011 Tohoku-OkiEarthquake, Natural Disaster Research Report, No. 48, 63-72, 2012 (in Japanese).17）Hashimura, H., Uryu, M., Yamazaki, T., Nakanishi, R., Kirita, F. and Kojima, K.: A study on the response characteristicsof base-isolated structures for earthquake motion (Part 1 & Part 2), Proc. Annual Meeting of AIJ, 621-624, 2011 (inJapanese).40