桂林理工大学学报2024，Vol.44Issue(2)：239-247,9.DOI:10.3969/j.issn.1674-9057.2024.02.007
含水合物土一维压缩特性
Properties of one-dimensional compression for hydrate-bearing soil
摘要
Abstract
The property of one-dimensional compression for hydrate-bearing soil is an important means to ana-lyze the deformation of hydrate-bearing strata.Based on the physical properties of sediments from SH3 boreholes in Shenhu sea area of the South China Sea,fine-grained soil was artificially prepared as hydrate occurrence me-dium,and hydrate-bearing soil samples were formed and one-dimensional compression tests were carried out.The effects of hydrate saturation and ambient temperature on the compression deformation of hydrate-bearing soil were studied.The test results show that as the saturation of hydrates increases and the ambient temperature de-creases,the soil containing hydrates becomes more difficult to compress and its compressibility decreases.The influence of hydrate saturation and ambient temperature on pre-yield compression index and swelling index is not obvious,but the increase of hydrate saturation and decrease of ambient temperature will significantly reduce the pre-yield compression index and increase the preconsolidation pressure.The formation of hydrate fills the pore space and solidifies soil particles,but the decrease of environmental temperature makes the cementation more obvious,and it is difficult for the soil particles and hydrate particles to move and rearrange,so the soil is diffi-cult to be compressed and the overall structure becomes stronger and stronger as the pre-consolidation pressure increases.According to the analysis,the empirical relationship between the preconsolidation pressure and the hydrate saturation is proposed,and the mathematical expression which can effectively describe the one-dimen-sional compression curve is given.关键词
含水合物土/一维压缩/先期固结压力/压缩指数/回弹指数Key words
hydrate-bearing soil/one-dimensional compression/preconsolidation pressure/compression index/rebound index分类
土木建筑引用本文复制引用
颜梦秋,黄永茂,顾翔,颜荣涛,杨德欢,于海浩,徐玉博,陆地..含水合物土一维压缩特性[J].桂林理工大学学报,2024,44(2):239-247,9.基金项目
国家自然科学基金项目(11962004) （11962004）
广西自然科学基金项目(2017GXNSFAA198215) （2017GXNSFAA198215）
