Vol.42,No.2JournalofInnerMongoliaUniversityofScienceandTechnology第42卷第2期June,2023内蒙古科技大学学报2023年6月S型隧道施工引起的下方盾构隧道变形规律研究张利民（中铁二十局集团有限公司，陕西西安710000)摘要：S型曲线隧道上穿施工引起的既有盾构隧道变形规律及变形控制措施等尚不清楚，有待进一步研究．依托呼和浩特市新建S型隧道上穿既有盾构隧道工程工程，采用数值模拟、现场监测等研究方法，针对穿越过程中既有盾构隧道的变形规律与隆起变形控制措施进行研究。研究结果表明：综合变形控制效果与经济效益，中隔壁法+双侧砂袋压重为最优方案；采用49~87棉、2m压重高度的砂袋压重与“隔一拆二”的中隔壁拆除法,可确保安全施工；既有盾构隧道最大的拱顶竖向变形出现在右导洞贯通阶段，最大变形值为4.1mm,小于变形控制标准．预期研究成果可为类似工程提供重要的经验参考。关键词：S型隧道；穿越工程；盾构隧道；变形特征；砂袋压重中图分类号：TU93文献标识码：A文章编号：2095-2295(2023)02-0139-06D01:10.16559/j.cnki.2095-2295.2023.02.008DeformationofthelowershieldtunnelcausedbytheconstructionofaS-shapedtunnelZHANGLimin(ChinaRailway20thBureauGroupCo.Ltd,Xi'an710000,China)Abstract:Thedeformationcharacteristicsanddeformationcontrolmeasuresoftheexistingshieldtunnelcausedbytheconstructionofansuperpositionofvariouscrossingforms(S-typecrossing)arestillunclearandrequirefurtherresearch.BasedontheconstructionofthenewS-shapedtunnelcrossingtheexistingshieldtunnelinHohhotCity,numericalsimulationandon-sitemonitoringmethodswereemployedtostudythedeformationcharacteristicsoftheexistingshieldtunnelduringthecrossingprocessandthemeasuresforcontrol-lingupliftdeformation.Theresearchresultsshowthattheoptimalsolutionistocombinethemethodofmiddlepartitionandtheoneu-singsandbagsascounterweightaccordingtothedeformationcontroleffectivenessandeconomicbenefits.Byusing49to87sandbagswithaheightof2metersforcounterweightandthe“everyotherdemolition”methodforthemiddlepartition,safeconstructioncanbeensured.Themaximumverticaldeformationoftheexistingshieldtunneloccursduringthepenetrationstageofrightpilottunnel,withamaximumdeformationvalueof4.1mm,whichisbelowthede...
