青海东部卵石层特点及隧道关键技术探讨  

Discussion on characteristics of pebble layer and key tunnel technology in Eastern Qinghai

作　　者：石波[1,2] 王永亮 肖博 李科[1,2] SHI Bo;WANG Yongliang;XIAO Bo;LI Ke(China Merchants Chongqing Communications Research and Design Institute Co.,Ltd.,Chongqing 400067,China;National Engineering Laboratory for Highway Tunnel Construction Technology,Chongging 400067,China;Qinghai Transportation Holdings Group Co.,Ltd.,Xining,Qinghai 810008,China)

机构地区：[1]招商局重庆交通科研设计院有限公司,重庆400067 [2]公路隧道建设技术国家工程实验室,重庆400067 [3]青海省交通控股集团有限公司,青海西宁810008

出　　处：《岩石力学与工程学报》2021年第S02期3295-3300,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点研发计划专项资助(2017YFC0805305);国家自然科学基金资助项目(41601574);重庆市自然科学基金(杰出青年基金)项目(cstc2021jcyj-jqX0012)。

摘　　要：为提升青海东部地区卵石层隧道建设技术,首先总结该地区分布的卵石层特点,通过1:20几何模型试验,测得隧道开挖过程中地表及洞顶位移变形规律,并结合隧道现场监测数据予以验证,揭示了卵石层隧道开挖过程中拱顶位移先期变化快、后期变化缓慢的规律:其次,根据青海东部地区卵石地层独有的沉积分布规律,总结了隧道穿越卵石层的4种方式,并分析各种方式的风险点和对策:再次,通过对该地区多个项目的建设经验总结,提出隧道建设15字核心理念,以及该地区卵石层隧道的设计和施工重难点,并通过综合比选,给出小导管和自进式锚杆各自适用范围:最后,通过peck公式给出极限状态下地表的容许最大沉降值计算公式,便于隧道地表监测控制和管理。In order to improve the construction technology of the pebble layer tunnel in the eastern part of Qinghai,the characteristics of the pebble layer distributed in the area were summarized.The surface displacement and the deformation of the tunnel roof during the excavation process were measured by the 1:20 geometric model test.Combined with the monitoring data of the tunnel site,it reveals the rule that the arch top displacement is fast in the early stage and slow in the later stage during the excavation of the pebble layer tunnel.According to the unique sedimentary distribution law of the pebble strata in the eastern part of Qinghai,four types for tunnels to crossing the pebble strata are summarized,and their risk points and countermeasures are analyzed.Based on the construction experience of many projects in this area,it is put forward that the core concepts and important difficulties in the design and construction of the pebble layer tunnel are put,and the scope of application of small pipes and self-advancing anchors is given.In the end,the calculation formula of the maximum allowable settlement value of the ground surface under the limit state through the peck formula is deduced,which is convenient to improve the tunnel construction management.

关 键 词：隧道工程 青海东部 卵石层 室内试验 现场监测 设计与施工 

分 类 号：U451[建筑科学—桥梁与隧道工程]