地铁施工横通道转区间正线处下穿既有建筑沉降控制研究

Study on Settlement Control of Existing Building Induced by Horsehead Excavation From Transverse Gallery to Main Tunnels

中文关键词:下穿  马头门  沉降  房屋  加固

英文关键词:undercrossing  horsehead  surface settlement  building  reinforcement

中文摘要:

      以某城市地铁施工横通道转区间隧道正线马头门处下穿既有建筑物情况为例，从群洞施工工序对建筑物沉降影响的角度考虑，采用有限差分数值软件FLAC3D对不同开洞施工工况进行三维数值模拟，分析围岩变形情况，得出在横通道向区间马头门开洞施工时，必须单个逐一开洞施工至房屋基础外15 m以上，并在开洞马头门处增加有效加固措施，以保证既有建筑在地铁施工过程中的安全。

英文摘要:

      Taking the horsehead undercrossing the existing building for an example, this paper considers the settlement of the building from the construction process of group tunnels, analyzes the deformation of surrounding rock under the different construction process by using the finite difference numerical software FLAC3D. The conclusion is that horsehead construction must be completed one hole each time to more than 15 m outside the building foundation, and one by one. Mean while effective reinforcement measures must be taken in the open hole ingate place to ensure the building’s safety in the process of subway construction.