Abstract:Compared with the traditional shallow buried underground excavation method, the horizontal cover hole method has no special requirements for the minimum soil cover thickness, solving the problem of underground excavation construction in ultra shallow buried stations. In order to deeply explore the differences between the transverse tunnel cover method and the traditional PBA construction method, a transfer station in Jinan is taken as the research object. Finally, the construction processes of the two processes are elaborated, and then numerical models of the two processes are established using finite element software. The settlement laws of the entire construction process of the transverse tunnel cover method and the PBA construction method are compared. And the influence laws of parameters such as pipe jacking stiffness and jacking range were systematically explored. The research results indicate that compared with the PBA construction method, the transverse tunnel cover method has advantages such as high construction accuracy, multiple and large working faces, low cost, fast speed, reasonable stress, and clear force transmission; The settlement of the two construction methods during the excavation of the entire pilot tunnel accounts for 87.4% and 75.6% of the total settlement, respectively, making them the focus of surface settlement control; The overall surface settlement of the horizontal tunnel cover method is smaller than that of the PBA construction method, and when the top cover soil depth is within 7 m, the horizontal tunnel cover method has obvious advantages in controlling surface settlement. Therefore, for the top of this project (with a soil cover depth of about 3.9~4.4 m), the horizontal tunnel cover method is more suitable; Overall, changing the outer diameter of the steel pipe in the horizontal tunnel cover method will not have a significant impact on surface settlement during the construction phase. As the outer diameter of the steel pipe changes, the fluctuation range of surface settlement is 0~2 mm; When increasing the lateral jacking distance, surface subsidence exhibits a pattern of first rapidly increasing and then stabilizing.