雁鹅山深埋公路隧道溶洞处置措施及有限元分析  

Analysis of Disposal Measures and Finite Element of Karst Caves in Yan'e Mountain Deep-buried Highway Tunnel

作　　者：程敬克 CHENG Jingke(The Fifth Engineering Co.,Ltd.,China Railway 15^(th) Bureau Group,Tianjin 300133,China)

机构地区：[1]中铁十五局集团第五工程有限公司,天津300133

出　　处：《兰州工业学院学报》2023年第1期16-21,共6页Journal of Lanzhou Institute of Technology

基　　金：国家自然科学基金(U1604135);中铁十五局集团有限公司A类科研课题(2019A01);河南省科技厅产学研合作项目(2015HNCXY011)。

摘　　要：针对雁鹅山深埋隧道开挖过程中揭穿大量溶洞的问题,为保证隧道施工安全顺利进行,综合分析区域内地质环境及溶洞特征,提出开挖所遇各类型溶洞处置措施。以安全风险较高的YK21+347~YK21+339区段拱顶位置较大溶洞处置方案为例建立有限元模型,分析处置前后围岩位移、锚杆轴力及塑性区变化规律,同时选择典型断面监测围岩变形情况。结果表明:溶洞处置后,围岩最大隆起位移降低83.9%,最大沉降位移降低89.5%,锚杆轴力峰值降低17.2%,溶腔洞壁及围岩塑性区范围减小,其发展得到有效控制。隧道施工安全顺利进行,证明了洞壁加固+护拱处置方案的可行性,可为类似工程提供借鉴参考。Aiming at the problem of a large number of karst caves exposed in the process of the excavation of the Yan'e Mountain deep tunnel,in order to ensure the safe and smooth progress of the tunnel construction,the geological environment and the characteristics of the karst caves in the region are analyzed comprehensively,and the disposal measures for various types of karst caves encountered in the excavation are proposed.In this paper,a finite element model is established by taking the larger-scale karst cave disposal scheme at the vault position of the YK21+347~YK21+339 section with high safety risk as an example.The variation law of surrounding rock displacement,bolt axial force and plastic zone before and after disposal is analyzed.At the same time,a typical section is selected to monitor the deformation of surrounding rock.The results show that after the disposal of karst cave,the maximum uplift displacement of the surrounding rock is reduced by 83.9%,the maximum settlement displacement is reduced by 89.5%,and the peak axial force of the bolt is reduced by 17.2%.The range of the cave wall and surrounding rock plastic zone is reduced,and its development is effectively controlled.The tunnel construction is carried out safely and smoothly,which proves the feasibility of the tunnel wall reinforcement and arch protection disposal scheme,which can provide reference for similar projects.

关 键 词：深埋公路隧道 溶洞处置 开挖模拟 有限元分析 

分 类 号：U455[建筑科学—桥梁与隧道工程]