盾构隧道下穿河流对地表沉降影响和控制措施
The Influence and Control Measures on the Surface Subsidence of the Shield Tunnel Running through the River

盾构法作为一种新型的地铁隧道施工工法，以其安全性较高、适应各种不同地层、对周边环境影响较小等优点，应用越来越广泛。当盾构长距离下穿河流时，施工对土体的扰动较大，施工风险和施工难度也随之加大。为保障盾构下穿河流过程中的施工安全，以此地层为工程背景，通过Midas软件对注浆压力、掘进压力和覆土厚度进行了数值模拟，研究它们对地表沉降影响进行了分析，发现在不同参数下，地表沉降和变形是不同的，最终确定了盾构参数的安全取值范围；提出了降低相关施工风险的控制措施。
As a new type of subway tunnel construction method, the shield method is more and more widely used due to its advantages of high safety, adaptability to various strata, and less impact on the surrounding environment. When the shield tunnel runs down the river for a long distance, the construction will disturb the soil mass greatly, and the construction risk and construction difficulty will also increase. In order to ensure the construction safety of the shield tunneling through the river, with the stratum as the engineering background, the grouting pressure, the driving pressure and the thickness of the covering soil were numerically simulated by Midas software, and their influence on the surface subsidence was analyzed. Under different parameters, the surface settlement and deformation are different. Finally, the safe value range of shield parameters is determined. Control measures to reduce related construction risks are proposed.