摘要
冻胀破坏是制约季节性冻土地区渠道衬砌与防渗工程建设的关键因素,采用非冻胀性材料置换渠道冻胀性土壤是有效防止渠道冻胀破坏的措施之一。针对北方寒冷地区渠道冻胀破坏的特点及置换防冻胀技术应用中存在的问题,提出了混凝土衬砌渠道置换防冻胀标准化结构形式,明确了其适用条件和范围,确定了置换层施工的技术要求,并基于热阻等效原理建立了置换层厚度的计算公式,根据工程实例数据确定了计算修正系数,并利用新疆冲乎尔灌区渠道置换防冻胀试验进行了验证,最终的置换层厚度计算值与最佳设计值之间最大误差仅为4.3%,表明该计算公式有较高精确度,对渠道置换防冻胀工程的设计建设可起到一定参考作用。
Frost heave damage is a key constraint factor for the concrete lined canal construction in seasonal frozen soil areas.Using non-heaving material to replace frost-heaving soil is one of the effective measures to prevent the frozen damage of concrete lined canal.According to the characteristics of the canal frost heave damage and the problems in replacement frost heave prevention,this paper puts forward a standardized structure pattern of the replacement frost heave prevention technology for the concrete lined canal,gives its conditions and scopes,and also confirms the technical requirements of the replacement layer construction.Meanwhile,based on the thermal equivalence principle,this paper establishes the calculation formula of replacement layer thickness,which is verified by the practical project.The final results show that the maximum error between calculated value and the best design value is only 4.3%,which proves that the formula has a high accuracy and can play a reference role for the design and construction of the concrete canal replacement frost heave projects.
出处
《节水灌溉》
北大核心
2015年第4期79-83,共5页
Water Saving Irrigation
基金
国家"十二五"科技支撑计划课题(2012BAD08B01)
水利部科技推广计划项目(TG1214)
关键词
混凝土衬砌渠道
置换防冻胀
标准化模式
热阻等效原理
concrete lined canal
replacement frost heave prevention
standardization mode
thermal equivalence principle
