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冻土帷幕厚度是冻结法施工过程中人为进行冻结控制的重要参考因素。施工中常采用巴霍尔金公式根据现场实测的测温点温度数据,结合温度场公式来反算冻土帷幕厚度。本文基于双排管巴霍尔金公式,对测温点位置的变化对冻土帷幕厚度的影响进行敏感度分析。理论分析结果表明,测温点布置在主面上靠近冻土帷幕边缘和双排管之间的中心附近位置时能得到比较准确计算结果(本文仅从理论上对测温点位置变化对帷幕厚度影响进行分析,工程实际一般不在双排管之间布置测温点);界面上与主面上的误差变化规律基本相同,且误差相对主面来说更小。故根据本文的计算结果,将测温点布置在界面上靠近冻土帷幕边缘和双排管之间的中心位置,能够使测温点位置对冻土帷幕厚度的推算误差影响最小,有利于保证工程施工质量和安全。
The thickness of permafrost curtain is an important reference factor for artificial freezing control during the construction of freezing method. In the construction, the Barholtz formula is often used to calculate the thickness of the frozen soil curtain according to the measured temperature data of the field and the temperature field formula. In this paper, the sensitivity analysis of the influence of the change of the temperature-measuring point on the thickness of the frozen soil curtain is carried out based on the double-tube Barholmetric formula. The results of theoretical analysis show that the temperature measurement points are arranged on the main surface close to the edge of the permafrost curtain and near the center between the two rows of tubes can get a more accurate calculation results (in this paper, only theoretical changes in the temperature point of the curtain thickness The impact of the analysis, the actual project is generally not arranged between the double-row pipe temperature measurement point); interface with the main surface of the error variation is basically the same, and the error is smaller than the main surface. Therefore, according to the calculation results in this paper, the temperature measurement point is arranged at the interface near the edge of the frozen soil curtain and the center of the double-row pipe, which can minimize the influence of the temperature measurement point on the estimation error of the frozen soil curtain thickness, Construction quality and safety.