砂泥岩地层地铁车站暗挖隧道施工方案比选研究被引量：2

Comparative Study of Mined Construction Schemes for Subway Stations in Sand-mudstone Strata

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摘要施工方案的合理选取对于保证隧道结构及地层安全至关重要。文章依托广西南宁轨道3号线青秀山地铁车站工程,针对下部穿越砂泥岩地层的站台层隧道,对三台阶法及CD法两种暗挖隧道施工方法进行了比选研究。研究结果表明:(1)三台阶法相对于CD法,施工速度更快,施工干扰较小;(2)三台阶法施工地表沉降达到50mm,CD法为11mm,CD法控制地表沉降较好,但均满足限值要求的60mm;(3)三台阶法施工二次衬砌压应力达到14MPa,拉应力达到1.98 MPa,CD法压应力为6.68 MPa,拉应力达到1.18 MPa,CD法控制地表沉降较好,但均满足C50混凝土的抗压强度限值32.4 MPa,抗拉强度限值2.64 MPa。综合考虑,在满足地表沉降及保证结构安全的基础上,青秀山地铁车站暗挖隧道宜采用施工速度更快的三台阶法。研究成果可为类似地铁车站暗挖施工提供参考。 Reasonable selection of construction scheme is very important to ensure the safety of tunnel structure and stratum.In the project of Qingxiushan subway station of Guangxi Nanning Rail Line 3,platform-level tunnels are excavated under sand-mudstone stratum.Two tunnel construction methods,namely the three-step method and CD method,are compared.The research results show that:(1)the three-step method has benefits such as a faster construction speed and less construction interference comparing with the CD method;(2)the surface settlement caused by three-step method and CD method is 50 mm and 11 mm,respectively.The CD method can better control the surface settlement,and both of them meet the limit requirement of 60 mm;(3)the three-step method causes a compressive stress of 14 MPa,a tensile stress of 1.98 MPa,and the CD method results in a compressive stress of6.68 MPa,and a tensile stress of 1.18 MPa,satisfying the C50 concrete compressive strength limit of 32.4 MPa and tensile strength limit of 2.64 MPa.As a summary,on the basis of satisfying the requirements for surface settlement and structural safety,the three-step method is adopted as the tunnel excavation method in Qingxiushan subway station.The research results can provide reference for similar underground station construction.

作者林锐李坤杰包逸帆秦鹏程严涛崔红利 LIN Rui;LI Kunjie;BAO Yifan;QIN Pengcheng;YAN Tao;CUI Hongli(Construction Co.,Ltd of China Railwvay Tunnel Group,Nanning 530000;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031;Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu,610031)

机构地区中铁隧道局集团建设有限公司西南交通大学土木工程学院西南交通大学交通隧道工程教育部重点实验室

出处《现代隧道技术》 EI CSCD 北大核心 2019年第S02期625-630,共6页 Modern Tunnelling Technology

基金西藏自治区重点研发与转化计划项目(XZ201801-GB-07) 中铁隧道局集团有限公司科技项目(2015-21) 云南省交通运输厅科技计划项目(云交科教便(2019)6号) 陕西省交通运输厅科技项目(下穿宝鸡秦岭32km公路隧道群建设与运营关键技术研究) 国家自然科学基金资助项目(51508475) 四川省科技厅科技创新创业项目(2018RZ0109)

关键词砂泥岩地层地铁车站数值模拟暗挖隧道施工方法地表沉降结构安全性 Sand-mudstone strata Subway station Numerical simulation Underground tunnel Construction method Surface subsidence Structural safety