浅埋地铁通道加固冻胀控制区设计与应用
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摘要
利用数值模拟方法,建立地铁通道温度场-应力场耦合模型。利用单因素分析,得出控制冻胀作用主要因素由大到小顺序为:改变盐水降温梯度、强制解冻、分期冻结。提出了包含卸压孔、测温孔、强制解冻孔3部分冻胀控制区设计参数,总结出改变盐水降温梯度、分期冻结、及时解冻、合理卸压的浅埋地铁通道冻胀控制方法。利用地表位移监测,证明了冻胀控制措施的有效性。
The coupling model for temperature and stress fields of subway passage was established by numerical simulation.According to the single factor analysis,it was concluded that the order of the main factors controlling frost heave from large to small is as follows:changing the gradient cooling of brine,artificial thawing and freezing by stages.The design parameters of frost heave control zone were put forward,the zone includes three parts:pressure release hole,temperature measuring hole and artificial thawing hole;and the frost heave control method of shallow buried subway passage was proposed,which includes changing the gradient cooling of brine,freezing by stages,timely thawing and reasonably releasing pressure.The effectiveness of frost heave control method was proved by the surface displacement monitoring.
The coupling model for temperature and stress fields of subway passage was established by numerical simulation.According to the single factor analysis,it was concluded that the order of the main factors controlling frost heave from large to small is as follows:changing the gradient cooling of brine,artificial thawing and freezing by stages.The design parameters of frost heave control zone were put forward,the zone includes three parts:pressure release hole,temperature measuring hole and artificial thawing hole;and the frost heave control method of shallow buried subway passage was proposed,which includes changing the gradient cooling of brine,freezing by stages,timely thawing and reasonably releasing pressure.The effectiveness of frost heave control method was proved by the surface displacement monitoring.
引文
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[2]黄继辉,夏才初,韩常领,等.寒区公路隧道冻胀力荷载的分布形式和简化计算方法[J].现代隧道技术,2016,53(5):63-70.
[3]杜江涛,俞蔡城,黄耀庆,等.地铁新建线路下穿既有线路车站方案研究及风险分析[J].施工技术,2016,45(S1):409-415.
[4]王彦洋,唐华瑞,李顺群,等.考虑温度梯度变化的地铁联络通道冻结法施工三维数值模拟[J].现代隧道技术,2015,52(6):135-140.
[5]冯欢欢,王助锋.流砂地层盾构始发土体加固盐水冻结技术研究[J].施工技术,2015,44(21):88-91.
[6]付财,韩圣铭,韩玉福.浅覆土条件下地铁出入口冻结法暗挖施工技术[J].施工技术,2014,43(7):91-93.
[7]王志良,申林方,谢建斌.人工冻结法单管冻结引起周围土体温度场变化的研究[J].现代隧道技术,2014,51(1):110-116.
[8]孙成伟,仇培云.广州地铁隧道联络通道冻结法施工技术研究[J].现代隧道技术,2012,49(3):161-165.
[9]魏龙海,郭小红,乔春江,等.南京纬三路大直径越江盾构隧道冻结法出洞方案研究[J].现代隧道技术,2011,48(3):80-86.
[10]竺维斌,张志,陈智辉,等.广佛线盾构隧道管片处理中冻结法封水的监测分析[J].现代隧道技术,2011,48(1):99-102.
[11]李方政.市政冻结技术的应用与展望[J].建井技术,2017,38(4):55-60.