九华山隧道穿越段明城墙沉降的三维数值分析

为减小穿越引起的明城墙不均匀沉降甚至城墙开裂,采取了城墙基础加固和超前支护等控制措施.采用三维数值方法,选取典型城墙基础断面,计算了未采取控制措施与采取控制措施后明城墙的沉降,并与部分实测数据对比.分析结果表明:采取控制措施后沉降量可以减少38%;隧道在通过城墙下部时,沉降量增加较快,应加强变形监测;计算值与实测值吻合较好.工程成功穿越明城墙证明,采取有效的超前支护和加固措施对地表建筑物变形控制具有重要的作用.

3-D numerical analysis of settlement of City Wall of Ming Dynasty of Jiu-huashan tunnel traversing position

The methods of foundation reforcement and leading supporting were adopted to reduce settlement and cracking of City Wall of Ming Dynasty. The settlement of the typical cross section of City Wall of Ming Dynasty with and without control methods was calculated by 3-D numerical method. Analysis shows that the settlement is reduced by about 38% with control methods, and the settlement increases quickly with tunnel through the cross section. The settlement calculated corresponds to the settlement monitored. The project traversing successfully City Wall of Ming Dynasty show that the methods of reforcement and leading supporting play an important role in controlling displacement of the building on the ground.