矿山法隧道穿越天桥变形影响及控制方法

The Influence and Control Methods of Deformation of Overpass Crossing in Mining Method Tunnels

浅埋暗挖法因其施工工艺简单、地面干扰少、地层适应性强,成为了城市繁华地段地铁隧道建设的主要工法,然而其施工必然会对邻近建构筑物产生影响。依托北京地铁22号线某隧道CRD法施工工程,采用数值模拟方法,精细化模拟了施工竖井和横通道、CRD法双线隧道全施工过程,提出了天桥的变形控制指标,研究施工影响下邻近既有人行天桥的变形规律及其控制措施。

The shallow buried and concealed excavation method has become the main construction method for subway tunnels in bustling urban areas due to its simple construction process,low ground interference,and strong geological adaptability.However,its construction will inevitably have an impact on adjacent buildings.Based on the CRD method construction project of a tunnel on Beijing Metro Line 22,numerical simulation methods were used to finely simulate the entire construction process of the vertical shaft and horizontal passage,as well as the CRD method double track tunnel.The deformation control indicators of the overpass were proposed,and the deformation laws and control measures of adjacent existing pedestrian overpasses under the influence of construction were studied.