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Abstract: The fragile Nichinan Group is distributed in southern Miyazaki Prefecture, Japan. The Higashi Kyushu Expressway Yoshinomoto Tunnel is a two-lane tunnel with a length of 1,880m, which is planned in this fragile Nichinan Group. The authors applied Center Drift Advancing method using the drift with high rigidity support to the Yoshinomoto tunnel. As a result based on the measurement at the time of...