摘要
为研究多年冻土区高温冻土的变形机制,分析了高温冻土与融土在物理力学性质方面的相似性,基于高温冻土具有未冻水量高、相变剧烈、压缩性大及渗透性相对较高的特点,尝试将其变形机理考虑为固结。在文中提出了一种移动区间法用以计算冻土融化固结,基于孔隙冰、水压力相互转化的融化固结模型,采用移动区间法模拟了融化区及高温冻土区的孔隙水压力变化。数值模拟结果表明:孔隙水压力分布曲线的拐点对应于相变温度,融土区由于渗透系数较大、排水条件好而使得孔隙水压力消散较快,相应的孔隙水压力较小;高温冻土区由于渗透系数相对较小,不能及时排水,因此孔隙水压力较高。
引文
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