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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。本文针对连云港疏浚土,采用土工离心模型试验技术,研究充填土袋堤体与地基的变形和整体稳定性。试验结果表明:充填土袋堤沉降主要发生在施工期,竣工后沉降变化很小,在堤体范围内沉降呈堤中心大、两边小的锅形分布。充填土黏粒含量对堤身的压缩变形影响较大,充填黏性土与充填砂性土相比,竣工期堤身压缩变形约高11%,竣工一个月后堤身压缩变形约高13%。堤体与地基失稳破坏为圆弧滑动破坏型式,充填黏性土堤稳定安全系数为1.19,充填砂性土堤的稳定安全系数为1.41,表明充填黏粒含量高达32.5%的黏性土筑堤能满足整体稳定要求。
Embedding technology of geotextile bags using dredged soil and puffed mud as filler has drawn great attention. In this paper, for the dredged soil in Lianyungang, the geotechnical centrifuge model test technique is used to study the deformation and overall stability of embankment and foundation in filling bags. The test results show that the settlement of filling bag embankment mainly occurs during the construction period. After the completion of settlement, the settlement has little change. In the embankment, the sedimentation of the embankment is large with the center of the embankment and the small boiler-shaped distribution on both sides. The clay content of the filling soil has a great influence on the compression deformation of the bank. Compared with the sandy soil, the compression deformation of the bank is about 11% higher than that of the filling sandy soil. After one month of completion, the compression deformation of the bank is about 13% . The failure instability of the embankment body and the foundation is a circular sliding failure type. The safety factor for filling the clay embankment is 1.19, and the safety factor for filling the sandy embankment is 1.41, indicating that the clay with clay content up to 32.5% Dike to meet the overall stability requirements.