浅埋偏压连拱隧道穿越古建筑施工控制研究  

Research on the Construction Control of Shallow-buried Unsymmetrical Pressure Double-arch Tunnel Crossing Ancient Buildings

作　　者：朱正国[1] 方智淳 马超义 杨梦雪 王志伟[2] 韩智铭 孙明磊 朱永全[1] ZHU Zhengguo;FANG Zhichun;MA Chaoyi;YANG Mengxue;WANG Zhiwei;HAN Zhiming;SUN Minglei;ZHU Yongquan(State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuag Tiedao University,Shijiazhuang,Hebei 050043,China;State Key Laboratory for Track Technology of High-speed Railway,China Academy of Railway Sciences,Beijing 100081,China;Hebei Technical and Innovation Center on Safe and Effective Mining of Metal Mine,Shijiazhuang,Hebei 050043,China)

机构地区：[1]石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室,石家庄050043 [2]高速铁路轨道技术国家重点实验室(中国铁道科学研究院),北京100081 [3]河北省金属矿山安全高效开采技术创新中心,石家庄050043

出　　处：《铁道工程学报》2021年第5期71-76,108,共7页Journal of Railway Engineering Society

基　　金：国家自然科学基金项目(51978424);高速铁路轨道技术国家重点实验室(中国铁道科学研究院)开放课题基金资助(2019YJ196);河北省人才工程培养经费资助项目(A201802005)。

摘　　要：研究目的:浅埋偏压连拱隧道具有围岩级别差、土层压力分布不均以及隧道断面大等特点,使得其在施工过程中易对结构严重风化、变形能力差的古长城墙体造成破坏。为探究浅埋偏压连拱隧道穿越古长城施工过程中变形规律与受力特征,本文以荣乌高速黄土岭隧道为背景,采用数值模拟对施工过程中隧道受力和变形进行分析,选出最合理施工方案,以期为偏压连拱隧道下穿既有建筑相关工程提供一定的理论指导。研究结论:(1)左右洞用侧壁导坑法进行开挖较CRD法以及CRD+CD法而言可有效降低地表沉降与拱顶沉降量,对施工而言最安全;(2)三种施工方法所形成的围岩应力数值不大,均处于安全状态;(3)三种施工工序下,导洞上方地表沉降与隧道拱顶沉降基本相同,但两侧导洞同时开挖可加快施工进度;(4)两侧导洞同时开挖时,中墙承受的应力最小;(5)为保证古长城不被破坏,最终沉降控制标准定为20 mm,爆破振速安全阈值为2 cm/s;(6)本研究成果可为浅埋偏压连拱隧道的施工提供一定借鉴。Research purposes: The shallow-buried unsymmetrical pressure double-arch tunnel has the characteristics of poor surrounding rock grade, uneven soil pressure distribution and large tunnel section, which makes it easy to damage the wall of the ancient Great Wall with severe weathering and poor deformability during the construction process. In order to explore the deformation law and stress characteristics of shallow bias double-arch tunnel crossing the ancient Great Wall in the construction process, this paper takes Huangtuling tunnel of Rongcheng-Wuhai expressway as the background, uses numerical simulation to analyze the stress and deformation of the tunnel in the construction process, and selects the most reasonable construction scheme, so as to provide some theoretical guidance for the bias double-arch tunnel crossing the existing buildings.Research conclusions:(1)Compared with CRD method and CRD + CD method, the side heading method can effectively reduce the surface settlement and vault settlement, which is the safest for construction.(2) The stress values of surrounding rock formed by the three construction methods are small, and they are in a safe state.(3) Under the three construction procedures, the ground settlement above the pilot tunnel is basically the same as that of the tunnel vault, but the construction progress can be accelerated by simultaneously excavating the pilot tunnels on both sides.(4) When the pilot tunnels are excavated at the same time, the stress on the middle wall is the minimum.(5) In order to ensure that the ancient Great Wall will not be damaged, the final settlement control standard is set at 20 mm, and the safety threshold of blasting vibration velocity is 2 cm/s.(6) The research results can provide some reference for the construction of shallow bias double-arch tunnel.

关 键 词：隧道工程 超浅埋 施工技术 地表沉降 数值模拟 

分 类 号：U455[建筑科学—桥梁与隧道工程]