水体赋存状态及转化对湛江组结构性粘土结构性的影响

Soil is an integrated system formatted from the development process of nature history. Its engineering geological properties depend on micro-structure, meso-structure, macro-structure and interaction between different levels. A lot of researches have been done on the micro-structure and macro-structure of engineering geological properties of structured clay of Zhanjiang Formation formed under different depositional environments lead to regional differences. However, little study has been done on the meso-structure level of engineering geological properties. This project will focus on the meso-structure level of occurrence and transformation of pore water in structured clay of Zhanjiang Formation by using Nuclear Magnetic Resonance (NMR) techniques which can quickly and accurately capture the morphology and distribution of water in the soil. In order to study the influences of the state and nature of water in the soil on the structural properties of structured clay will be studied based on occurrence and transformation of the water in the soil before and after the disturbance in different regions. This research will study the micro-structure effect on the macro-structure properties of the structured clay from the meso-structure level view point which can contribute to the development of new research methods and ideas for the comprehensive understanding of the mechanical properties of structured clay of Zhanjiang Formation. This research will also be very useful of completing the research of the mechanical properties of structured clay of Zhanjiang Formation.

土体是一个在自然历史发展过程中形成的综合体系，其工程地质性质的形成包含了微观结构、细观结构及宏观结构层次之间的相互关联、相互作用。针对湛江组结构性粘土由于地质成因的区域差异导致不同沉积环境下形成的土体有着不同的工程地质特性的现象，已有研究从微观结构及宏观特性上进行了较多的分析，细观结构层次上的土体特性的研究相对较少。本项目将立足于细观层次上土中孔隙水的赋存状态及转化对湛江组结构性粘土进行研究，基于核磁共振技术能快速准确的捕获土中水的形态及分布的测试手段，辅助于相关室内试验，对不同区域结构性粘扰动前后土中水赋存状态及转化过程进行研究，探讨土中水的状态及性质对粘土结构性的影响，进而解释其区域特性的差异。项目从细观角度将结构性粘土的微观结构对宏观性质的影响进行诠释，为全面认识湛江组结构性粘土的力学特性提供全新的研究方法及思路，促进湛江组结构性粘土工程特性研究的完善。

岩土介质作为一种工程材料，其中水分的物理状态、水与岩土体的相互作用等对其岩土工程特性的影响不容忽视。随着无损测试技术的迅猛发展，核磁共振技术已经被广泛地应用于多种学科。水是一种含氢量较高的物质，在核磁共振中具有很强的信号及敏感性，所以核磁共振已经开始引入岩土工程中水分问题的解决。本项目利用核磁共振这一特性，通过对雷北河流相湛江组结构性粘土进行核磁共振试验，研究了土体中的水分赋存状态，并结合压汞试验分析了土体内孔隙分布规律。同时，辅助于相关室内试验，对不同区域结构性粘扰动前后土中水赋存状态进行了研究，探讨土中水的状态及性质对粘土结构性的影响。核磁共振技术为全面认识湛江组结构性粘土的力学特性提供全新的研究方法，促进湛江组结构性粘土工程特性研究的完善。