浅埋大断面土质隧道下穿明长城施工安全控制技术研究

Shallow-Buried Large-Section Soil Tunnel Passing Under the Great Wall of the Ming Dynasty

针对西河口浅埋大断面隧道下穿明长城施工难点,为有效保护文物,确保施工安全,文章提出了采用水泥-水玻璃双液地表注浆加双层大管棚的洞内外预加固措施、双侧壁导洞超短台阶施工工法及支护参数局部优化的综合安全控制技术。通过模型试验论证了方案的可行性,给出了确保下穿明长城安全施工的地表沉降控制标准,并通过现场监测评价了方案的合理性。

Aimed at the construction difficulties of the Xihekou shallow-buried large-section tunnel that passes under the Great Wall of the Ming dynasty, this paper proposes a comprehensive safety control technology, i.e., pre-reinforcement by cement-water-glass grouting on the ground and a double-layer pipe-roof support in the tunnel; construction by double-side drift with a short bench; and locally optimizing the support parameters. Based on a model test, the feasibility of the scheme was verified and control standards of ground settlement were deter- mined. Scheme rationality was assessed in light of field monitoring.