RJP高压旋喷法及冻结法在盾构接收端头的组合运用  

Combined Application of Rodin Jet Pile Method and Freezing Method to Shield Receiving End Soil

作　　者：陈松 CHEN Song(China Railway First Survey ＆ Design Institute Group Co.,Ltd.XVan 710000,Shaanxi,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,陕西西安710000

出　　处：《隧道建设（中英文）》2018年第6期1037-1043,共7页Tunnel Construction

摘　　要：为解决复杂周边环境及软弱富水地质条件下的盾构接收难题,以天津地铁5号线某车站盾构接收端头加固工程为例,提出RJP高压旋喷法+冻结法组合加固方法。结合理论计算和工程实际,给出RJP工法及冻结法的加固方案和工艺参数,并对冻土温度、地表及管线位移进行实测分析,得到如下结论:1)同一测温孔中间位置温度低于两端,同一深度处内圈测温孔温度低于外圈,冻结壁由中间向两端、由内圈向外圈发展;2)管线在土体冻结及解冻过程中均未发生明显位移,说明RJP工法改良土体可有效抑制冻结引起的冻胀融沉;3)地表最大沉降17.4 mm,管线最大沉降6.2 mm,均满足位移控制要求,证明RJP工法及冻结法组合加固方案合理可行。In order to solve the problem of shield receiving in complex surrounding environment and soft water-rich condition,the combined method of Rodin jet pile（RPJ） method and freezing method are put forward based on end soil reinforcement of a metro station on Tianjin Metro Line No. 5. The reinforcement scheme and technological parameters are presented by combining theoretical calculation and engineering practice; and the frozen soil temperature and settlement of ground surface and pipelines are monitored and analyzed. The study results show that：（1） The center temperature of a thermometer hole is lower than surrounding one; the inner ring temperature is lower than outer one at same depth of thermometer hole; and the frozen soil wall develops from middle to both ends and from inner ring to outer ring.（2） Obvious displacement does not occur to pipelines during soil freezing and unfreezing period,which indicates that the soil improvement can effectively control freezing-induced thawing settlement.（3） The maximum settlements of ground surface and pipelines are 17. 4 mm and 6. 2 mm,respectively,which meet relevant requirements and illustrate the rationality and feasibility of the combined method of RPJ and freezing method.

关 键 词：盾构接收 端头加固 RJP工法 冻结法 冻胀 融沉 

分 类 号：U457.3[建筑科学—桥梁与隧道工程]