极浅埋大跨度连拱隧道地表沉降模型试验研究

Study with Geomechanical Model Test on Surface Subsidence of Extremely Shallow Large-span Double-arch Tunnel

长城岭隧道是双向6车道大跨度连拱隧道,最大埋深为5m,下穿古齐长城遗址,为了保证地表文物不受施工扰动破坏,地表沉降控制尤为重要.通过地质力学模型试验,按照施工设计开挖和支护方式对施工过程中产生的地表沉降进行预测研究,分析了施工措施对地表沉降的影响规律,得到了地表沉降的量值和分布特征.

The Great Wall tunnel was a six-lane with two-way tunnel with large span double-arch tun- nel,the maximum depth less than 5 meters and cross the Qi -Great Wall site,in order to avoid the de- struction of surface artifacts from the construction disturbance, surface subsidence control was particu- larly important. Through geomechanical model test,with the surface subsidence prediction wich gen- erated in the process of construction according to construction methods of excavation and support, and according to the results proposed to control surface subsidence control measures, the influence of the surface subsidence under the construction measures was analysisied and the magnitude and distribution of the surface subsidence were gotten, research results could provide guidance for the tunnel construc- tion.