Analysis of load sharing behavior for piled rafts using normalized load response model

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Tunneling under roadway/railroad in a busy urban area is not an easy work due to a hostile environment involving weak ground and a shallow embedded condition and resulting in a great possibility of tunnel face stability problems. Divided Shield Method (DSM) is one of techniques to reduce the instability of the tunnel face using divided steel plates as a shield for tunneling. This study investigated the effectiveness of layers of the horizontal pipe grouting at the face of DSM tunneling on the stability and construction speed. The investigation was undertaken by the test chamber and its numerical verification. Surface deflection of the chamber fill and the stability of the tunnel face were measured with the excavation sequence. Numerical analyses of the chamber test were conducted to predict further behaviors of DSM tunneling. The results of the study show that DSM tunneling reinforced by horizontal pipe grouting reduced the ground movement and construction time, and enhanced the stability of the tunnel face significantly. Using the test and analysis results, the potential development of a new method that can reduce the construction period was discussed in detail.

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