Abstract
ABSTRACT The construction of shallow urban tunnels inevitably will affect the foundations of nearby structures due to the resulting settlement of the soil. This paper reports the results of a parametrical study that was conducted to assess the extent of the settlement problem near piles. The numerical model used in this assessment was FLAC 2D. In this study, the pile settlement results were studied by changing the rock parameters, such as elastic modulus, cohesion, tensile strength and friction angle where the pile is situated. We also studied the effects of changing the vertical and lateral distances between the piles and tunnel. From this numerical study, it was concluded that rock parameters, such as elastic modulus, affect the settlement results. Cohesionaffected the settlement results when it was lowerthan a certain fixed value, while other parameters had no effect. Changes in the lateral and vertical distances of the plies from crown of the tunnel affected the settlement results. Various parameters related to tunnel construction were used to develop a descriptive matrix. The construction of the matrix was based on Rock Engineering System(RES), and the parameters included the dimensions of the tunnel, overburden, and the lateral and vertical offsets of the piles. Further research is needed to determine the numerical values for each matrix term.
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