黄土状盐渍土洗盐前后物理力学性质的变化  

Variations of Physical and Mechanical Properties of Saline Loess before and after Desalting

作　　者：邴慧[1] 武俊杰[1] 邓津[2] 

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 [2]中国地震局兰州地震研究所,甘肃兰州730000

出　　处：《冰川冻土》2011年第4期796-800,共5页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目(40901039);国家自然科学基金创新群体项目(40821001);中国科学院"西部之光"人才培养计划博士项目(290928591)资助

摘　　要：兰州黄土是典型的硫酸盐盐渍土,土中易溶盐的存在严重影响土体物理力学性质.采用去离子水浸泡过滤的方法对兰州黄土做了洗盐处理,比较了洗盐前后土体物理力学性质的变化.由于洗盐后土体的颗粒粒组成分发生较大变化,颗粒细化,黏性土颗粒的增多,导致土体的液塑限有不同程度的升高;洗盐后黄土状盐渍土的结构性发生变化,钙质胶结程度降低,土体的抗剪强度参数和单轴抗压强度均有不同程度的增大.Lanzhou loess is the typical sulfate saline soil, and the soluble salt in the soil has a significant influence on the physical and mechanical properties of the soil. In order to study the salt effect on the physical and mechanical properties of the Lanzhou loess and compare the variations of the soil properties with and without salt, the desalting experiments on the Lanzhou loess were performed by dipping the soil into the deioned water to soak out the salt in the original soil and then to filtrate for remaining the soil particles. The Atterberg limits of the soil after desalting increase owing to the variation of soil particle composition and grain refining. The shear strength parameters and the u-niaxial compressive strength increase after desalting owing to the decrease in calcitic cementation and the variation of soil structure after desalting.

关 键 词：盐渍土 洗盐 颗粒细化 结构性 强度参数 

分 类 号：P642.131[天文地球—工程地质学]