充泥管袋筑堤的施工速度主要受制于管袋充填后的排水固结效率, 后者与所充填土料的级配有关, 土颗粒粒 径越小排水固结效率越低。我国东南沿海地区广泛分布的小粒径充进管袋后淤堵严重, 传统的管袋充填施工工艺 已经不再适用。通过室内试验对比, 发现细颗粒含量较高的土料充填后会在管袋表层形成软弱泥层, 难以固结; 而 在管袋表层开设排泥口后可以有效排除管袋表层的细颗粒泥浆, 提高了排水的效率。通过吊袋沉淀试验发现, 不同 级配的土料沉淀后粒径较大的土颗粒大部分于吊袋底部, 粒径较小的细颗位于吊袋表层; 管袋表层开设排水口不会 造成粗颗粒土料的损失。

The co nstr uction speed of embankment with mud2f illed tubes is constra ined by the co nso lidatio n drainag e efficiency af2 ter the filling o f tubes, w hich is r elated to the g radatio n of the f illing soil mater ial. Smaller soil par ticle size r esult s in smaller co nso lidatio n dra inag e efficiency. I n the southeaster n co astal area o f China, ther e a re a lot o f so il mater ial w ith small gr ain size, which can cause ser ious clog g ing w hen they ar e filled into the tubes, and therefo re t he traditio nal co nstr uctio n scheme o f tube filling is no lo ng er applicable. The compar ativ e study of laborat ory tests showed that f illing the tubes w ith the soil mat erial of high content of fine2gr ained part icles can fo rm a soft clay layer at the surface o f tubes and cause difficulty for consolidation. However , o pening o f mud drainag e mo ut h at the surface o f tubes can remov e the mud with fine2gr ained par ticles and then in2 cr ease the dr ainage efficiency. The punching bag precipitation tests also sugg est ed t hat most o f the so il materia l w ith co arser2 gr ained particles appear in the bottom of the bag s while the soil mater ial w ith finer2g rained par ticles occur at the surface of the bag s. The ex istence of drainag e pipe o pening at the surface of the bags w ill not cause loss of coar ser2gr ained so il mater ial.

国家科技支撑计划课题( 2012BAB03B02)