单排管冻结巴霍尔金温度场控制参数敏感度分析

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，结合冻结孔布置方案来反算冻土帷幕厚度。为了使反算结果更加准确，针对巴霍尔金公式中的测温点位置、测温点温度及冻结管外表面温度3个参数对冻土帷幕厚度反算值影响的敏感度进行分析。结果表明：3个参数对冻土帷幕厚度的测算均有较大影响；测温点位置布置在冻土帷幕边界附近时能得到比较准确的计算结果；测温点温度的测量误差越大计算结果的误差也越大；冻结管外表面温度产生较大波动也会导致计算结果产生较大波动。

Sensitivity analysis of control parameters of Bakholdin solution in single row pipe freezing

During the construction,according to the site measured temperature data and the layout of the freezing holes,Bakholdin formula is used to calculate the thickness of frozen soil.In order to obtain more accurate results,the sensitivity analysis was conducted about three parameters,including location of the temperature measuring points,temperature of measuring points and outer surface temperature of frozen pipes,influent the result of the calculated frozen wall thickness in Bakholdin model.The results show that the three parameters all have great influence on the calculation of the frozen wall thickness;more accurate results can be obtained if temperature measuring points are arranged near the boundary of the frozen wall;the greater the error of measuring point temperature,the greater the error of calculation results;big fluctuation of the outer surface temperature of freeze pipes may lead to huge fluctuation of the result.