考虑施工步影响的层状围岩隧道力学响应特性研究  

Study on Mechanical Response Characteristics of Layered Surrounding Rock Tunnel Considering the Influence of Construction Steps

作　　者：王庆 杨永斌[1] 焦卫宁[1] 高伟政 薛文飞 WANG Qing;YANG Yongbin;JIAO Weining;GAO Weizheng;XUE Wenfei(CCCC Second Highway Engineering Co., Ltd., Xi 'an 710065, China)

机构地区：[1]中交第二公路工程局有限公司,西安710065

出　　处：《交通科技》2022年第1期71-76,共6页Transportation Science & Technology

基　　金：国家自然科学基金项目(51804107);中交第二公路工程局科技研发项目(GHTJ-07-QT-046)资助。

摘　　要：为快速、安全地进行层状软弱围岩隧道施工,文中依托彭水县H隧道建立三维有限元计算模型,依次研究施工步与围岩等级、地应力强度、侧压力系数、层间摩阻因素耦合影响下层状围岩隧道支护结构力学响应特性,并分别验证加强型、双层初期支护结构的改良效果。结果表明,与层理呈90°方向拱圈位置处最易产生挤压破坏。S1-1~S1-6施工步下测点应力及位移曲线震荡幅度均较大,且在S2-1施工步时达到峰值水平。加强型、双层初期支护措施下支护结构应力最大降幅分别为16.58%、33.68%,数值计算与现场监测结果吻合度较好。In order to carry out the construction of layered soft surrounding rock tunnel more quickly and safely,a three-dimensional finite element calculation model is established based on H tunnel in Pengshui County,the mechanical response characteristics of the support structure of the lower surrounding rock tunnel are studied under the influence factors,such as the coupling effects of construction steps and surrounding rock grade,in-situ stress strength,lateral pressure coefficient and interlayer friction etc.,and the improvement effect of reinforcement and double-layer initial support structure is verified.The results show that compression failure is most likely to occur at the arch ring with a 90°direction to the bedding.The vibration amplitude of stress and displacement curves of measuring points under S1-1~S1-6 construction steps are large,and reach the peak level in S2-1 construction step.Under the reinforced and double-layer initial support measures,the maximum stress decreases of the support structure are 16.58%and 33.68%respectively.The numerical calculation is in good agreement with the field monitoring results.

关 键 词：隧道工程 层状围岩 数值模拟 现场测试 

分 类 号：U456[建筑科学—桥梁与隧道工程]