摘要
为掌握G109项目浅埋偏压隧道施工时的隧道收敛变形演化规律,以清水2号隧道工程为背景,基于数值模拟,研究三台阶工法施工时浅埋偏压隧道的变形特征及演化规律。研究结果表明:随着隧道掘进,当隧道掘进深度小于40 m时,沉降变形量逐渐减小,沉降最大值在洞口处;当隧道进尺大于40 m后,沉降变形量先增大后减小,拱顶沉降最大值位于隧道掌子面后方15 m处,而拱肩沉降最大值出现在隧道掌子面后方20 m处;拱腰收敛最大值出现在掌子面后方10 m处;数值模拟与监测技术的有效结合,可为工程实践提供指导。
In order to master the evolution law of tunnel convergence deformation during the construction of shallow buried eccentric pressure tunnel of G109 project,taking Qingshui No.2 tunnel project as the background and based on numerical simulation,the deformation characteristics and evolution law of shallow buried eccentric pressure tunnel during the construction of three-step construction method are studied.The results show that with the tunneling,when the tunneling depth is less than 40 m,the settlement deformation decreases gradually,and the maximum settlement is at the portal;when the tunnel footage is greater than 40 m,the settlement deformation first increases and then decreases.The maximum settlement of arch crown is located at 15 m behind the tunnel face,while the maximum settlement of arch shoulder is located at 20 m behind the tunnel face;the maximum value of arch waist convergence appears at 10 m behind the tunnel face;the effective combination of numerical simulation and monitoring technology can provide guidance for engineering practice.
作者
袁毅
YUAN Yi(China Railway 22nd Bureau Group Co.Ltd.,Beijing 100043,China)
出处
《铁道建筑技术》
2022年第7期202-205,共4页
Railway Construction Technology
基金
中铁二十二局集团有限公司科技研究开发计划项目(14-C16)。
关键词
浅埋偏压隧道
三台阶法
数值模拟
现场监测
变形规律
shallow buried eccentric pressure tunnel
three-step method
numerical simulation
on-site monitoring
deformation law
