摘要
为探明上鼓变形机理,采取控制上鼓变形的有效措施,保障列车运行安全。依据某铁路隧道的现场勘测结果,发现引起隧底结构上鼓变形的主要原因为:隧底结构形状和地质因素。通过数值模拟分析可知:隧底结构形状的异形会使隧底结构抗上鼓变形能力大幅降低;高地应力是引起隧底结构上鼓变形的主要地质因素;围岩蠕变引起的隧底上鼓变形也不容忽视;采用开挖泄压洞,并施作锚杆能有效控制隧底结构上鼓变形。
In order to explore the deformation mechanism of the upper drum,effective measures to control the deformation of the upper drum are obtained to ensure the safety of train operation.Relying on the site survey of a railway tunnel,it is concluded that the main factors causing the deformation of the upper drum of the tunnel bottom structure are the shape of the tunnel bottom structure and geological factors.Through numerical simulation analysis,it is found that the shape of the tunnel bottom structure will greatly reduce the resistance of the tunnel bottom structure to the deformation of the upper drum.High geostress is the main geological factor causing the deformation of the upper drum of the tunnel bottom structure,and the deformation of the upper drum of the tunnel bottom caused by the creep of the surrounding rock cannot be ignored.The use of excavation of pressure relief holes and bolting rods can effectively control the deformation of the upper drum of the tunnel bottom structure.
作者
罗勇
LUo Yong(The 5th Engineering Co.,Ltd.,China Railway 11th Bureau Group,Chongqing 400037,China)
关键词
隧底结构
上鼓变形
变形机理
控制措施
tunnel bottom structure
upper drum deformation
deformation mechanism
control measures
