为克服传统冻结暗挖法联络通道施工存在的长距离施工困难、冻胀融沉造成影响等问题,依托天津地铁10号线某区间盾构法联络通道,对天津地区长距离联络通道盾构法施工的技术要点和控制方法,以及对周边环境的影响进行了分析研究。结果表明:在天津软土地区,联络通道盾构法始发与接收采用封闭套筒、微冻结加固、钢板环梁、注浆封堵及加固等措施,严格控制和适时调整盾构掘进参数,能有效防止漏水漏砂风险,减小对主隧道及周边环境影响。联络通道盾构法施工将导致沿隧道轴线方向上部土体产生U型槽型沉降变形,始发端一侧的沉降总体上大于接收端一侧的沉降,最大沉降量约10 mm,对建(构)筑物影响总体较小。主隧道作为施工作用力载体,始发端主隧道水平位移大于接收端,始发隧道将呈现先横椭圆形后竖椭圆形的收敛变形,需重点关注始发段主隧道。
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.
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