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.
作者
李文勇
LI Wenyong(Shanghai Rail Transit Line 18 Development Co.,Ltd.,Shanghai 200120,China;Shanghai Shentong Metro Group Co.,Ltd.,Shanghai 200120,China)
出处
《建井技术》
2018年第2期50-53,共4页
Mine Construction Technology
基金
国家自然科学基金资助项目(51208004)
关键词
浅埋地铁通道
冻胀控制
冻结法
数值模拟
shallow buried subway passage
frost heave control
freezing method
numerical simulation
