摘要
随着隧道机械化、装配化施工的推进,探索新型结构的支护效应对于实现“双碳”目标具有重要意义。基于新型组合结构支护体系,依托某浅埋黄土隧道,探讨了传统型钢钢架与π型钢架的抗弯性能,并通过现场监测结合数值模拟,对比分析了传统支护体系与新型支护体系下的围岩变形特征及响应规律,明确了各自的支护效应。结果表明:相比传统型钢钢架,π型钢架I_(x)/I_(y)更加接近1,水平和垂直方向的抗弯能力相对平衡,稳定性更好;数值计算结果与现场监测数据的沉降趋势较为吻合,围岩变形发展均经历4个阶段,且拱顶最终沉降及周边收敛的计算平均误差分别为14.85%和15.25%,验证了数值建模方法的正确性;建立对比分析模型,与传统支护体系相比,新型组合结构支护体系下的拱顶沉降、周边收敛以及初期支护压应力分别减少53.4%、61.0%、35.2%,塑性区的扩展得到有效控制。本研究可进一步丰富黄土隧道支护结构选型,为同类工程施工提供参考。
With the mechanization and assembly of tunnels,it is important to explore the support effect of new structures to achieve the“double carbon”target.Based on the new combined structural support system,this paper discussed the flexural performance of the traditional steel frame andπ-shaped steel frame by relying on the Daijiazui tunnel.Through field monitoring and numerical simulation,the deformation characteristics and response law of surrounding rock under the traditional support system and new support system were compared and analyzed,and their support effects were defined.The results show that compared with the traditional steel frame,π-type steel frame I_(x)/I_(y) is closer to 1,the bending capacity in the horizontal and vertical directions is relatively balanced,and the stability is better.The numerical calculation results are consistent with the settlement trend of field monitoring data.The deformation development of surrounding rock has experienced four stages,and the average errors of the final settlement of vault and the surrounding convergence are 14.85%and 15.25%,respectively,which verifies the correctness of the numerical modeling method.A comparative analysis model is established.Compared with the traditional support system,the vault settlement,peripheral convergence and initial support compressive stress under the new combined structure support system are reduced by 53.4%,61.0%and 35.2%,respectively,and the expansion of plastic zone is effectively controlled.This study can further enrich the support structure selection of loess tunnel and provide reference for the construction of similar projects.
作者
蔡元成
杜可
王志超
赖金星
谢少华
Cai Yuancheng;Du Ke;Wang Zhichao;Lai Jinxing;Xie Shaohua(School of Highway,Chang'an University,Xi'an 710064,P.R.China;Seazen Holding Group Co.,Ltd.,Shanghai No.2 Branch,Shanghai 200062 P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2023年第3期921-934,共14页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(52008028)
陕西省重点研发计划(2021SF-513)
长安大学研究生科研创新实践项目(300103722002)
长安大学中央高校基本科研业务费专项资金项目(300102212204)。
关键词
黄土隧道
施工支护
抗弯刚度
围岩变形
数值模拟
loess tunnel
construction support
flexural rigidity
surrounding rock deformation
numerical simulation
