The authors have carried out the experiment of the two kinds of caliber, water injection, without water to the flexible joint of the ductile cast iron pipelines under the situation of not coving soil.

• 方法对采用胶圈连接的柔性接口球墨铸铁管线，在不覆土的情见下，分别进行了两种管径、注水、不注水的静载拉拔试验。