基于核磁共振技术探究细粒土中孔隙水的分布

Distribution Mechanism of Pore Water in Fine-grained Soil Based on Nuclear Magnetic Resonance Technology

细粒土中孔隙水分布特征影响其物理力学性质,厘清细粒土的孔隙水分布特征及其影响因素对深刻认识细粒土的力学特性尤为重要。为探究细粒土颗粒孔隙水水分布机制,利用核磁共振技术进行了一系列试验,研究了细粒土颗粒物理化学性质和初始含水率对孔隙水分布的影响。随着含水率的增加核磁共振分布曲线向右侧移动,而高岭土表现得最为明显;对比不同细粒土饱和后发现,高岭土的弛豫时间要大于膨胀土和红黏土,饱和后高岭土的孔径较大。

The distribution characteristics of pore water in fine-grained soils affects its physical and mechanical properties.It is very important to clarify the distribution characteristics of pore water in fine-grained soils and its influencing factors to understand the mechanical properties of fine-grained soil.In order to explore the distribution mechanism of pore water in fine grained soil,a series of experiments were carried out,using nuclear magnetic resonance technology,to study the effects of physical and chemical properties of fine-grained soil and initial water content on pore water distribution.The NMR distribution curve moves to the right with the increase of water content,and kaolin is the most obvious.Different fine soilssaturated,the relaxation time of kaolin is larger than that of expansive soil and red clay,and the pore size distribution of kaolin is larger.