Case Analysis of Shield Method Contact Channel Project in Rich Water Soft Soil Area

In order to overcome the long distance difficulties of construction in the construction of the traditional freezing method and the influence of freezing, swelling and subsidence, based on the shield method contact channel of Tianjin Metro Line 10, the technical points and control methods of shield method construction of long-distance contact channel in Tianjin, as well as the influence on the surrounding environment, are analyzed and studied. The results show that: In the soft soil area of Tianjin, using measures such as the closed sleeve, micro-freezing reinforcement, steel plate ring beam, grouting plugging and reinforcement measures at the starting and receiving ends of the contact channel can strictly control and timely adjust the shield tunneling parameters, which can effectively prevent the risk of water leakage and sand leakage and reduce the impact on the main tunnel and the surrounding environment. The shield construction of the contact channel will lead to U-shaped settlement deformation of the upper soil along the tunnel axis direction. The settlement of the starting end is generally greater than the settlement of the receiving end, and the maximum settlement is about 10mm, which has little overall impact on the construction (structure). As the carrier of construction force in the main tunnel, the horizontal displacement of the main tunnel at the starting end is greater than that of the receiving end. The initial tunnel will present the convergent deformation of the horizontal ellipse and then the vertical ellipse, so the main tunnel at the initial section should be focused on.