工程地质学报2017，Vol.25Issue(5)：1293-1298,6.DOI:10.13544/j.cnki.jeg.2017.05.015
纳米碳酸钙影响下红黏土强度特性试验研究
EXPERIMENTAL STUDY ON STRENGTH CHARACTERISTICS OF RED CLAY UNDER INFLUENCE OF NANO-CaCO3
摘要
Abstract
This paper explores the mechanism of Nano-CaCO3 on the mechanical properties of Guilin red clay. Triaxial shearing test under unconsolidated-undrained conditions is carried out using TSZ-1 type triaxial tester.The influence of the amount of Nano-CaCO3 on cohesive force,internal friction angle,shear strength and stress-strain curve of remolded red clay under different dry density conditions is analyzed.The mechanism of the influence of Nano-CaCO3 on the mechanical strength of red clay is explained from the point of view of collochemistry character of red clay mineral grain.The result of the experiment shows that with the increase of Nano-CaCO3 content,the cohesion,internal friction angle and shear strength of red clay show a tendency to decrease first and then increase. The incorporation of Nano-CaCO3 to change the original dielectric charge PH value changes the adsorption balance of the original iron oxide cementation to a new calcium cemented aggregate.It changes the strength characteristics of red clay.When the initial dry density is 1 .4g·cm-3 ,the stress-strain curve of the remolded red clay sample changes from an elastic ideal plastic strain type to a strain hardening type after adding Nano-CaCO3 .关键词
纳米碳酸钙/桂林红黏土/抗剪强度/应力-应变曲线Key words
Nano-CaCO3/Guilin red clay/Shear strength/Stress-strain Curve分类
天文与地球科学引用本文复制引用
陈学军,胡舒伟,黄耀意,白汉营..纳米碳酸钙影响下红黏土强度特性试验研究[J].工程地质学报,2017,25(5):1293-1298,6.基金项目
国家自然科学基金项目(41762022),广西岩溶动力学重点实验室开放课题基金(KDL201604),广西高校科学研究项目(KY2015YB119),广西重点实验室基金(11-kf-02)(12-A-01-02)(11-CX-01),桂林理工大学博士(后)启动基金项目资助. （41762022）
