小型灌区渠道抗冻胀方案探讨

摘要

季节性冻土地区的基土冻胀破坏会降低渠道水利用系数.在抗冻胀设计中,常用的防止冻胀措施为预制C15混凝土+砂砾石垫层弧底梯形渠和预制C15混凝土+聚笨乙烯泡沫板弧底梯形渠两种衬砌形式.通过在小型灌区渠道改建设计中对比两种措施分别在两种常见的断面型式下投资直接费用,得出在小型渠道抗冻胀措施中砂砾石垫层方案投资经济具有一定的优势.%On seasonally frozen ground area,frost heave damages of base soil will reduce channel water uti-lization coefficient.In the frost heave resistance design,the frost heave resistance measures commonly used have two lining forms,which are trapezoidal channel with arc bottom of prefabricate C15 concrete plus sand and gravel stratum and of prefabricate C15 concrete plus polystyrene foam board.The comparison of direct investment cost of two different measures respectively under two commonly sectional forms from designs of channel reconstruction of small-sized irrigation area indicates that the sand and gravel stratum program in the frost heave resistance measure of small-sized channel has a certain advantage in investment economy.