针对南水北调中线干线工程焦作1段工程建设中出现挤塑聚苯乙烯（XPS）保温板导热系数检测结果不符合技术要求的问题，为了明确XPS保温板导热系数对渠系防冻胀作用的影响程度，协调项目法人、设计、监理、施工等参建单位各方矛盾，在分析检测报告、检测方法和检测仪器的基础上，根据相关的国家标准和行业标准要求，对初步设计报告中提供的保温板铺设厚度进行了反推演。计算结果显示，渠系防冻胀设计用XPS保温板导热系数范围0.067～0.090 W/(m?k)。根据实际保温板铺设厚度和渠道保温板的防冻胀目的，建议XPS保温板导热系数性能指标数值选用平均温度25℃下≤0.039W/(m?k)，10℃下≤0.028 W/(m?k)，检测单位应该在相应平均温度下进行检测，使得原材料质量控制为工程安全运行和正常功能发挥提供有效保障。

The testing results of thermal conductivity of the extruded polystyrene (XPS) insulating board during the construction of Jiaozuo 1st engineering project in the Middle Route of South-to-North Water Diversion Project did not meet the technical requirements. In order to determine the effects of thermal conductivity of the XPS insulating board on channel anti-frost-heavy and to coordinate the relationships between project entity, design, management, and construction, the thickness of XPS insulating board was inversely calculated based on the analysis of test report, method, and instrument and the related national and industrial standards. The results showed the r thermal conductivity values of XPS insulating board in the channel anti-frost-heavy practice range from 0.067 to 0.090 W/(m?k). According to the actual thickness of insulating board and the anti-frost-heavy practice, the suggested thermal conductivity values of XPS insulating board were 0.039 W/(m?k) when the mean temperature was below 25℃ and0.028 W/(m?k) when the mean temperature was below 10℃. The scientific assignment to thermal conductivity is the key to ensure the project quality.

国家科技支撑计划项目“重点领域气候变化影响与风险评估技术研发与应用”（2012BAC19B03）