为了寻求防渗效果好、造价低廉的防渗方法,六十年代初,在河北省房涞涿灌区的总干渠上采用当地粘土和砂卵石进行了粘砂混合土渠道防渗试验,并在水利水电科学院做了材料性能试验。该防渗工程历经24年干湿冻融循环的考验,全部防渗渠段基本上仍保持着良好的防渗效果。实践证明,粘砂混合土确实是一种就地取材、造价低廉,适于大中小型渠道采用的良好防渗材料。一、衬砌简述粘砂混合土防渗试验渠段,长1.88公 In order to seek for a seepage control method with good impermeability and low cost, in the early 1960s, local clay and sand and pebbles were used to prevent and cure seepage in the mixed channel of sand and sand in the main trunk canal of Fangjiaduan Irrigation District in Hebei Province. Hydropower College made a material performance test. The anti-seepage project after 24 years of wet-dry freeze-thaw cycle test, all impermeable canal basically still maintain a good anti-seepage effect. Practice has proved that sticky sand mixed soil is indeed a kind of local materials, low cost, suitable for large medium and small channels using a good impermeable material. First, a brief lining of sand mixed seepage test impermeable canal section, 1.88 km long