论文部分内容阅读
多圈管冻结工法已在深厚地层井筒掘砌中广泛应用,但对多圈管冻结温度场需进一步深入研究.以某冻结井筒为原型,对关键层位开展冻结管无偏斜条件下的冻结温度场模型试验、进行冻结管偏斜条件下的温度场数值计算,同时利用温度场信息可视化软件对现场实测结果进行分析.将三种测试手段获得的结果进行比较,得出冻结管偏斜对冻结壁有效厚度影响较小,但对冻结壁平均温度、冻结壁交圈时间影响都很大,且容易在冻结壁内部产生密闭未冻承压水仓,造成冻胀力聚集,对冻结壁整体稳定性及井筒开挖不利.其结果可为多圈管冻结法凿井设计与施工提供参考.
The multi-circular tube freezing method has been widely used in deep-well borehole excavation, but the multi-ring tube freezing temperature field needs further study.With a frozen well as a prototype, Temperature field model test, the numerical calculation of the temperature field under the condition of the deflection of the freezing tube is carried out, and the field measurement results are analyzed by using the visualization software of temperature field information.The results of the three test methods are compared to get the deflection of the frozen tube The effective thickness of the frozen wall has less influence on the average temperature of the frozen wall and the time of the frozen wall, and it is easy to produce a sealed unfrozen water pressure chamber inside the frozen wall, resulting in the accumulation of frost heaving force. The stability and wellbore excavation are unfavorable.The results can provide references for the design and construction of multi-ring pipe freezing drilling method.