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金塔县位于河西走廊中段的北部边缘,属季节性冻土地区,多年平均气温8.0℃,1月份平均气温-13.8℃,平均冻结深度1.15m,最大冻结深度1.41m。六十年代初期,我县最初开展混凝土渠道衬砌试验,由于对基士的性质、水、冰冻、气候等因素的影响认识不足,建成的渠道未经通水,进入冬季就遭受冻胀破坏。为了研究冻胀过程规律,消除冻胀变形,1964年开始,利用当地材料在东干渠进行试验。经多年的试验和实践认识到,水、土、温度为渠道防渗衬砌冻胀破坏的三个因素,同时发现,冻胀一般多发生在渠侧坡二分之一到三分之一之间,在渠线经过耕地时冻胀强烈。现将本县混凝土衬砌渠道采用的一些抗冻措施介绍于后。
Quinta County is located in the northern margin of the middle section of the Hexi Corridor, belonging to the seasonal frozen soil region. The average annual temperature is 8.0 ° C. The average temperature in January is -13.8 ° C. The average freezing depth is 1.15m and the maximum freezing depth is 1.41m. In the early 1960s, our county initially carried out concrete channel lining test. Due to lack of understanding of the influence of factors such as the nature, water, ice and climate of Kishi, the channels built did not pass through the water and suffered frost heaving damage in winter. In order to study the law of frost heaving process and eliminate the frost heave deformation, beginning in 1964, using the local materials to test in the trunk canal. After many years of experiments and practice, we know that water, soil and temperature are the three factors that prevent the canal lining from freezing and destructing. At the same time, it is found that the frost heaving usually takes place between one half and one third of the side slope , The frost heave is intense when the canal passes through the arable land. Now the county concrete lining channels used in some antifreeze measures introduced in the post.