高压条件下土的冻融试验装置研制及应用  

Development and application of a newsoil freezing-thawing test apparatus for high loading conditions

作　　者：关辉[1] 王大雁[1] 顾同欣[1] 马巍[1] 温智[1] 王永涛[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃兰州730000

出　　处：《冰川冻土》2014年第6期1496-1501,共6页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目(41071048);国家重点基础研究发展计划(973计划)项目(2012CB026106);中国科学院知识创新工程重要方向性项目(KZCX2-YW-QN307)资助

摘　　要：深部土体冻融后的物理力学性质对深部人工冻结工程意义重大.针对该问题,在以往土的冻融试验装置的基础上,设计出适用于高压条件下土的室内冻融试验装置,并给出了高压条件下土的冻融试验方法.基于该装置,对有压条件下兰州黄土在不同冷端温度下的单向冻结特征进行了试验研究.结果表明:无压单向冻结过程中土的变形以冻胀为主,而高压情况下则主要表现为压缩变形.在有压单向冻结过程中,试样内部仍然存在着明显的水分重分布过程.试验分析表明,该试验装置能够为高压条件下土的冻结特征及冻融作用后土的物理力学性质研究提供技术支持.Studies on the physical and mechanical properties of soil under freezing-thawing cycles are of great significance for the stability of deep artificial freezing engineering. Based on previous apparatuses, in the paper, a new soil freezing-thawing test apparatus for high loading conditions was developed and related test procedures were suggested. Using the apparatus, the freezing characteristics of Lanzhou loess under different cold-end temperatures were tested and analyzed. Results indicate that the soil specimen exhibits frost heaving as no loading during freezing, but exhibits compression under high external load. Besides, obvious water migration occurs during soil freezing under loading without external water supply. It is found that this new apparatus can offer an efficient technical support for studies of the physical and mechanical properties of soil under loading conditions during and after freezing-thawing cycles.

关 键 词：冻土 高压条件 冻融试验 水分迁移 

分 类 号：P642.14[天文地球—工程地质学]