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  Tunnel excavation effect on pre-existing underground structure

  The scaled model tests of closely-spaced twin tunnel by using homogeneous material are per- formed and induced displacements are measured around the tunnel openings during excavation. The influence of separation distance between tunnels and the coefficient of earth pressure (K) on the behavior of closely-spaced tunnel are investigated. The results are expressed by the induced displacement vector, progress of crack and load around the tunnel openings during construction and at failure. The results show that based on the analysis of induced displacement at the crown during construction, the additional displacement of the preceding tunnel induced by the excavation of following tunnel decreases as the separation distance between twin tunnel is increased until the center to center distance is two times of tunnel diameter. Beyond this point, however the addi- tional displacement has become stabilized. The test results on the influence of coefficient of earth pressure (K) show that the general aspect of displacement and crack growth changes significantly depending on the coefficient of earth pressure. In addition, the weak zone in view of stability var- ies as well.

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