盾构隧道下穿高铁路基变形影响规律及加固优化研究  被引量:4

Research on the Deformation Law and Reinforcement Optimization of Shield Tunnel when It Goes down Through the High-speed Railway Foundation

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作  者:王立新[1,2] 王强 苗苗 汪珂 李储军[1] 邱军领 WANG Lixin;WANG Qiang;MIAO Miao;WANG Ke;LI Chujun;QIU Junling(China Railway First Survey and Design Institute Group Co.,Ltd.,Xi'an 710043,China;School of Civil Engineering and Architecture,Xi'an University of Technology,Xi'an 710048,China;School of Highway,Chang'an University,Xi'an 710064,China;Shaanxi Huashan Road and Bridge Group Co.,Ltd.,Xi'an 710016,China)

机构地区:[1]中铁第一勘察设计院集团有限公司,西安710043 [2]西安理工大学土木建筑工程学院,西安710048 [3]长安大学公路学院,西安710064 [4]陕西华山路桥集团有限公司,西安710016

出  处:《铁道标准设计》2024年第2期126-134,142,共10页Railway Standard Design

基  金:国家自然科学基金项目(52078421);陕西省“特支计划”青年拔尖人才(陕组通字[2018]33号);中铁第一勘察设计院集团有限公司科研项目(院科19-75-01)。

摘  要:为研究盾构隧道下穿高铁路基施工时对路基的影响规律,探究在隧道开挖过程中运用不同加固措施对既有高铁路基的影响程度。以西安市某地铁工程为依托,利用室内模型试验对比分析盾构隧道下穿高铁CFG桩复合路基过程中,无加固、超前管幕工法加固与地表袖阀管注浆加固3种隧道施工条件下,地表沉降值和沉降槽的空间分布规律;采用数值模拟分析验证超前管幕工法加固工况下盾构隧道下穿时,高铁路基、道床的位移变化规律。室内模型试验结果表明:盾构隧道施工中采用管幕工法加固后复合地基正上方的地表沉降最大值减小28.6%,采用袖阀管注浆加固后减小18.0%,并且采用两种加固措施后的CFG桩最大附加轴力均减小20%以上。因此,在隧道掘进过程中采用一定加固措施,可改善围岩稳定性,其中管幕工法加固效果更为显著。数值模拟分析表明:采取管幕工法加固施工与不采取加固措施相比,路基最大沉降量减少33.78%,道床最大沉降量减少45.08%。因此,管幕工法加固能够有效减小对既有高铁路基的影响。In order to study the influence law of the railway bed during the construction of the shield tunnel down through the high-speed railway foundation,and to explore whether the use of different reinforcement measures in the tunnel excavation process can effectively reduce the impact on the existing high-speed railway foundation,indoor model tests are used,with reference to a subway project in Xi'an,to compare and analyze the surface settlement value and the spatial distribution of settlement trough during the process of shield tunnels passing down the high-speed rail CFG pile composite subgrade.The tunnels are constructed with three construction methods:no reinforcement,pipe-curtain advanced reinforcement and sleeve-valve pipe grouting reinforcement on the surface.At the same time,numerical simulation is employed to analyze and verify the displacement change law of subgrade and track bed of high-speed railway,when the shield tunnel is reinforced by pipe-curtain advanced reinforcement method when crossing the high-speed railway downward.The results of the indoor model test show that the maximum surface settlement directly above the composite foundation will be reduced by 28.6% if the pipe-curtain advanced reinforcement method is used in the construction of the shield tunnel,and it will be reduced by 18.0% if the sleeve valve tube grouting is used for reinforcement,and the maximum additional axial force of CFG piles after adopting two kinds of reinforcement measures is reduced by more than 20%.Therefore,the stability of surrounding rock can be improved by adopting certain reinforcement measures during tunnel excavation,and the reinforcement effect of pipe-curtain advanced reinforcement method is more significant.Numerical simulation analysis shows that the maximum settlement of the roadbed is reduced by 33.78%,and the maximum settlement of the track bed is reduced by 45.08% compared with the construction without reinforcement measures.Therefore,the use of pipe-curtain advanced reinforcement method during shield tunnel

关 键 词:盾构隧道 高铁路基 管幕工法 模型试验 数值模拟 变形规律 加固措施 

分 类 号:U238[交通运输工程—道路与铁道工程] U213.1[建筑科学—桥梁与隧道工程] U455.43

 

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