水在渠道防渗工程冻害中的作用及防治冻害对策

我国东北、华北、西北等寒冷地区的渠道防渗工程，因多为薄板式结构，裸露面很大，同时经常与水接触，甚至在冬季负温下仍要输水运用，故其冻胀破坏更为严重，影响了工程效益的充分发挥。本文在简述水在渠道防渗工程冻害中的作用后，从渠道防渗工程的设计、施工和管理运用方面，提出了保证防渗层工程质量、降低基上水分、防止外水渗（流）入渠基、降低地下水位和管理运用等防治冻害较为具体的对策。

Effects of Water on Frost Damage of Canal linings and ways for Damage Control in north Chine

In northern China,the canal seepage controlling works generally suffer from serious frost damage because the slab linings are abroadly adopted and the canals usually are operated in winter. In this paper,the effects of water on the frost damage of canal lining is discussed and then with a view id the design of seepage controlling works and the construction, management and operation of the canals,ways for prevention of damage caused by water are put forward, including ensuring the quality of construction, reducing moisture of uderlying soil,preventing infiltration into subgrade,lowering ground water level,and optimum management and operatioll of the canals etc.