直线形单排管冻土帷幕平均温度计算方法  

Average Temperature Calculation for the Straight Single-Row-Pipe Frozen Soil Wall

作　　者：胡向东[1,2] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092

出　　处：《冰川冻土》2010年第4期778-785,共8页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目(50578120);国家高技术研究发展计划(863计划)项目(2006AA11Z118)资助

摘　　要：冻土帷幕平均温度是人工地层冻结工程设计、施工和安全管理的重要参数.为了确定单排管冻土帷幕的平均温度,进而确定冻土的力学参数和冻土帷幕的承载能力,为冻土帷幕的安全状态作出评价.以单排管冻土帷幕温度场的巴霍尔金解析解为基础,建立了直线形单排管冻土帷幕的平均温度的两种计算模型——等效梯形法和等效三角形法模型,该模型以冻土帷幕某一横截面厚度上的等效梯形法或等效三角形法计算的平均温度来等效整体冻土帷幕的平均温度.在实际工程中可能出现的冻结管平面布置参数变化范围中,全面考察了冻土帷幕平均温度等效梯形法和等效三角形法计算结果与依据巴霍尔金解析解数值积分计算结果的误差.结果表明,等效梯形法和等效三角形法计算的冻土帷幕平均温度误差很小,优于流行的计算方法.In the process of design,construction and safety management of artificial ground freezing engineering,average temperature is an essential parameter.It is the base of calculation of frozen soil＇s mechanical parameters and further predicting of bearing capacity and,after all,the safety evaluation of the frozen soil wall.Regarding the average temperature of single-row-piped frozen soil wall,several current calculation methods and their shortcomings are summarized in this paper.Further on,on the base of Bakholdin＇s analytical solution for temperature field under linear single-row-piped freezing,two new calculation models,namely equivalent trapezoid model and equivalent triangle model,are proposed.The two approaches,equivalent trapezoid and equivalent triangle,are used to calculate the average temperature of a certain section which indicates the condition of the whole frozen soil wall.For possible parameter range of freezing tube layout that might be applied in actual construction,the average temperatures of frozen soil wall obtained by the equivalent trapezoid method and by the equivalent triangle method are compared with that by numerical integration of Bakholdin＇s analytical solution.The result shows that the discrepancy is favorably small and the two new approaches are better than currently prevailing methods.

关 键 词：冻结法 单排管冻结 冻土帷幕 平均温度 等效梯形法 等效三角形法 巴霍尔金解 

分 类 号：TU472.9[建筑科学—结构工程]