Abstract
Long-term measurements of ground movements were made at three different sections above an earth pressure balance shield tunnel driven through the Yurakucho lower clay, with special reference to influence of grouting for filling the tail void on settlements above the shield. The settlement data were separated into three periods, passage of the shield, tail void formation, and subsequent settlement. The results showed that the grouting significantly reduced the magnitude and rate of settlement during tail void formation, but had little influence on the rate of settlement during the subsequent settlement.
