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为了获得PVC、PPR塑料冻结管在盐水冻结的温度场分布情况,采用物理模拟实验和理论求解相结合的研究方法,研究了PVC管、PPR管和钢管的单管冻结问题,分析了3种不同材质冻结管的冻结情况,获得了冻土区温度分布规律,掌握了PVC、PPR管作为冻结管冻土的发展速率,在同种情况下PPR冻结管的速度最慢,PVC管冻结的冻土帷幕平均发展速度约为钢管冻结发展速度的0.8倍。为采用PVC管作为冻结管,确定盐水冻结时间和计算冻结壁厚度,解决盾构进出洞免拔管问题提供基本参数。
In order to obtain the distribution of PVC and PPR plastic freezing pipe in the freezing temperature field of salt water, this paper studied the single tube freezing problem of PVC pipe, PPR pipe and steel pipe by the combination of physical simulation experiment and theoretical analysis. Freezing of material frozen tube, get the law of temperature distribution in permafrost region, master the development rate of PVC and PPR tube as frozen soil permafrost, PPR freeze tube is the slowest in the same situation, PVC tube freeze frozen soil Curtain average development rate of about 0.8 times the development of frozen steel pipe. In order to provide the basic parameters for using PVC pipe as a freezing pipe, determining the freezing time of the brine and calculating the frozen wall thickness, and solving the problem of the extubation of the pipe in and out of the tunnel.