土工膜防渗技术及其在湿陷性黄土渠道中的应用

Impervious technique by geomembrane and its application in canales Made of Collapsible Loess

针对西北地区干—湿与冻—融交替循环的特殊气候条件和宁夏扬黄灌区多为湿陷性黄土渠道的特点,在渠道防渗工程中提出了混凝土板—膜结合的土工膜铺衬型式.在此基础上,探讨了混凝土板—膜防渗技术的可行性及其施工方法、施工工艺和应注意的问题.通过对实施土工膜防渗技术后的固海扬水灌区渠道的检测分析,结果表明,用混凝土板—膜结合的土工膜防渗技术防渗效果明显,可以在湿陷性黄土渠道的老化改造工程中推广应用.

The surfacing model of concrete slabs covered with geomembrane in canal impervious project was proposed according to the special climate conductions of dry-wet and freezing-thawing alternation in northwestern China and the characteristics of most canals made of collapsible loess in pumping irrigation area in Ningxia.Then the feasibility of concrete slabs covered with geomembrane,the construction technique and problems noted were conferred.Through detection and analysis of the canals in Guhai pumping irrigation area after using impervious technique by geomembrane,the results showed that the effect was obvious by using concrete slabs covered with geomembrane for seepage control.The technique could be applied in the project for reforming the aging canals made of collapsible loess.