banner.jpg 10.3850/9789810844554-0102 The Optimum Distance of Roof Umbrella Method for Soft Ground by Using PFC Yusuke Doi^1,a, Tatsuhiko Otani² and Masato Shinji¹ Doi, Yusuke; Otani, Tatsuhiko; Shinji, Masato ¹Graduate School of Science and Engineering, Yamaguchi University, Yamaguchi, Japan. ^adoi@rock.civil.yamaguchi-u.ac.jp ²Nishimatsu Construction CO., LTD., Tokyo, Japan.

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