黏粒含量对充填泥袋沉积和排水的影响研究

Laboratory study on influence of clay content on sedimentation and drainage behavior of soil-filled geotextile bag

以连云港30万吨级航道建设工程为依托,针对黏粒含量对充填泥袋沉积和排水特性的影响,开展了泥水混合物沉积试验和充填泥袋的排水试验。试验结果表明:1泥水混合物的沉积过程大致可以分为两个阶段,即快速下沉阶段和平稳下沉阶段,快速下沉阶段持续时间较短,平稳下沉阶段持续时间很长,该阶段土体逐渐自重固结;2充填淤泥的黏粒含量越小,沉淀速率越大,沉淀持续时间越长;3充填泥袋的排水率随时间的延长而增大,随着黏粒含量的增加而减小;4从工程安全角度考虑,充填材料的黏粒含量不应大于18%。

Based on the three hundred thousand tons waterway engineering in Lianyungang Harbour, sedimentation test of clay and water mixture and drainage test of mud-filled bag are carried out to study the influences of clay content on the sedimentation and drainage behavior of soil-filled geotextile bag. The results show that：the sedimentation process could be divided into rapid sedimentation stage and steady sedimentation stage approximately, and the rapid subsidence stage has a shorter duration, the later stage has a longer duration, in which the soil consolidates gradually;the smaller the clay content is, the larger the sedimentation rate is and sedimentation duration is longer;the drainage rate of soil-filled bag increases with time and decreases with the incre-ment of clay content;taking account of the engineering safety, the clay content of filled soil should be controlled under 18%.