浅议墨玉灌区衬砌渠道防冻体垫层的设计

Design of Bedding Cushion for Preventing Frostbite of the Lining Ditch in Moyu Irrigated Area

墨玉灌区是新疆南部古老的灌区,地处塔克拉玛干沙漠南缘腹地,干旱、风沙夏热冬寒是灌区最显著的自然特征。灌区水资源非常缺乏,在水资源有限的情况下,如果要扩大绿洲面积,只有靠节水,目前渠道防渗是该灌区最常用的节水措施,而渠道冻胀破坏是影响渠道安全运行的一个重要因素,在资金有限的情况下,需要采取合理的工程防渗、防冻胀等措施,控制工程造价。依据该地区地面气候资料,结合规范的规定,计算渠道的设计冻深,确定渠道设置防冻体垫层的临界水深,判断衬砌渠道是否设置防冻体垫层。

The Moyu irrigated area is the old irrigated area in the south of Xinjiang province, it located in the south hinterland of the Taklimakan Desert. The marked natural feature of the irrigated area is drought and sand storm, hot in the summer and cold in the winter. The water resources are very short in the area. Water-saving is the only method to enlarge the area of the oasis under the condition of limited water resources. Anti-seepage of irrigation ditch is common means in this area,hut the damage from frost is the important factor for safe handling of ditch. The proper methods should be taken in anti-seepage and protection of frost to control the construction cost under the limited fund. This article discusses through the record of climate on ground in this area, combining the code, calculating design frost-depth of the ditch, confirming the critical value of stage to install bedding cushion for preventing frostbite, installing bedding cushion for preventing frostbite for the lining ditch.