大跨度黄土隧道施工对明长城沉降影响研究

Study on Influence of Construction of Large-span Loess Tunnel on Subsidence of Great Wall Built in Ming Dynasty

山西省山平高速公路二道梁隧道地表上方有明代古长城段,挖掘过程必将对古长城安全产生影响。结合该隧道黄土地质工程实际,采用邓肯-张非线性弹性本构关系,运用有限元分析软件MIDAS/GTS模拟三台阶法和双侧壁导坑法施工对明长城的影响,研究结果表明:采用双侧壁导坑施工法能有效地减少明长城沉降;最大沉降量能控制在规范允许范围内,有效保护了省级重点文物(明长城)的安全。

Taking Erdaoliang Tunnel of Shanyin-Pinglu Highway in Shanxi Province as the engineering background, the excavation inevitably affects the safety of the Great Wall built in Ming Dynasty which is above the tunnel. Combining with the the engineering practice of loess geology at the tunnel, how the construction by three-step method and double side drift method affects the Great Wall is simulated with non-linear elastic Duncan-Chang model and finite element analysis software MIDAS/GTS. The study result shows that double side drift method could reduce the subsidence of the Great Wall effectively with the maximum settlement to be controlled within a permitted standard range so that the province-level major cultural relic （the Great Wall built in Ming Dynasty） is protected effectively.