CRD法和台阶法施工对地铁隧道围岩变形的影响

Influence of Subway Construction by CRD Method and Bench Method on Surrounding Rock Deformation

以西安地铁三号线太白南路—吉祥村暗挖区间隧道工程为依托,采用台阶法和交叉中隔墙法(CRD法)对隧道施工时的围岩变形进行实时监测,并对数据进行回归处理,应用FLAC3D软件对2种施工方法进行模拟分析,系统研究了2种开挖方法的隧道围岩变形规律。研究结果表明:采用CRD法能够有效控制拱顶沉降及水平收敛量,减小施工对围岩的扰动程度,对于保持软弱围岩的自持能力及稳定性有明显作用;在进行西安地铁隧道施工时,应采用台阶法实现隧道的快速开挖,而对于地层条件复杂或施工要求较高的区段建议选择CRD法进行施工,以便更好地控制围岩变形,保持围岩稳定性。

Authors studied the tunnel deformation of South Taibai Road-Auspicious Village Tunnel for Xi＆#39;an Metro Line Three during constructed by using bench method and cross diaphragm method （CRD method） through the real-time monitoring and the regression on the data and the simulation analysis of both methods by FLAC3D software .Meanwhile ,the change law of surrounding rock deformation of the two excavation method was systematicall studied . Research results show that in Xi＆#39;an Metro tunnel construction ,the CRD method can effectively control the vault crow n settlement and horizontal convergence ,effectively reduce the disturbance degree of construction to the surrounding rock ,and has the obvious effect to maintain the self-sustaining capability and the stability of soft surrounding rock . In Xi＆#39;an Metro tunnel construction ,fast excavation in tunnel by bench method is achieved ,and it is recommended to choose the CRD method for the construction in complex geological conditions and construction higher requirements ,so as to control the deformation of surrounding rock better and maintain the stability of surrounding rock .