充填土袋受力和变形特性离心模型试验研究

利用疏浚土及吹填泥作为充填料的土工织物充填袋筑堤技术得到极大关注.针对连云港疏浚土,采用土工离心模型试验技术,研究黏粒含量对充填土袋受力和变形的影响以及充填袋水平排水效果.试验结果表明,充填土袋沉降主要发生在施工期,竣工后沉降变化很小,施工期充填土的孔隙水压力和充填袋的应变明显增大,竣工期达到最大,随后缓慢减小,不排水强度随深度增大.沉降和孔隙水压力随粘粒含量的增加而增大,不排水强度随粘粒含量的增加而减小.充填袋水平排水效果达10%~15%,充填土袋筑堤,充填土的黏粒含量应小于20%.

Centrifugal Model Test on Stress and Deformation Behaviors of Soil-filled Geotextile Bags

Great attentions have been dams and embankments using dredged clay content on stress and deformation paid to the application of large geotextile bags to fill. Centrifugal model tests are carried out to stu of soil-filled geotextile bag and the lateral drainage the construction of dy the influence of effect of geotextile bag in Lianyungang Harbor. Results show that the settlement of soil-filled geotextile bag occurs mainly in construction and very little after completion of construction. The pore pressure in filled soil and strain of geo- textile bag increase obviously during construction and reach the peaks at the completion of construction~ and then decrease slowly. The undrained shear strength of filled soil increases with depth. As clay content of filled soil increases, the settlement and pore pressure increase while undrained shear strength decreases. The lateral drainage effect of geotextile bag is about 10%- 15%. The clay content of filled soil should be con- trolled lower than 20% in the construction of embankment with soil-filled geotextile bags.