中文摘要：

基于太平洋C-C矿区的深海稀软底质土,选取4种膨润土（S1,S2,S3和S4）与水按调和配制出最佳模拟土;通过固结排水三轴压缩蠕变试验测得该模拟土在相同围压、不同轴压下的蠕变曲线,并采用不同的流变模型对其蠕变曲线进行参数识别,以确定该模拟土压缩蠕变本构模型。研究结果表明：模拟土S3为最佳模拟土,其在相同围压、不同轴压下的三轴压缩蠕变曲线具有相同变化趋势,均可分为瞬时蠕变、非稳定蠕变、稳定蠕变3个阶段,瞬时蠕变变形和非稳定蠕变阶段时长均随着轴压的增大而增大;K-H模型能精确地反映该模拟土的三轴压缩蠕变特性,取蠕变参数的平均值作为材料参数来建立深海稀软底质模拟土的压缩蠕变本构方程,可为深海集矿机的沉陷预测与安全评定提供依据。

英文摘要：

Based on the deep-sea sediment collected from the Pacific C-C mining area, four kinds of different bentonites（S1, S2, S3 and S4） were mixed with water to prepare the best simulative soil for the deep-sea sediment. Triaxial compressive creep curves under the same confining pressure and different axial compressive stresses were obtained by the consolidated-drained triaxial compressive creep test of the best simulative soil and fitted by different rheological models to determine a precise rheological model for the simulative soil. The results show that the simulative soil S3 is the best simulative soil for deep-sea sediment, and its triaxial compressive creep curves under the same confining pressure and different axial compressive stresses can be divided into transient creep,unstable creep and stable creep, where the transient creep deformation and the unstable creep time are both increased with the increase of the axial compressive stress. K-H model can describe triaxial compressive creep characteristics of the simulative soil with high precision. The average values of compressive creep parameters of the simulative soil are used as material constants to establish the compressive constitutive equation of the simulative soil for deep-sea sediment, which can provide basis for subsidence prediction and safety assessment of the deep-sea mining machine.