PREDICTIVE ANALYSIS TO EVALUATE BEHAVIOR OF CLOSELY CONSTRUCTED PARALLEL SHIELD TUNNELS.

Presented is an analytical method to predict the behavior of the lining of the existing tunnel when a new tunnel is constructed parallel and close to it. In the analysis, driving forces in the longitudinal and the lateral direction and the change of the earth pressure due to the construction of the new tunnel are evaluated separately. The behavior of the lining of the existing tunnel is computed and compared with the result of the measurement. The analysis shows good agreement with the measurement, hence the proposed method is effective for the design of the construction of closed parallel shield tunnels. K eywords: parallel shield tunnels, closed construction, pseudo-three dimensional analysis of segment rings