南昌工程学院学报2024，Vol.43Issue(3)：31-39,9.
聚丙烯纤维与土壤稳定剂联合改良煤系土的力学特性与微观机理
Mechanical properties and microscopic mechanism of improving coal bearing soil by combining polypropylene fiber and soil stabilizer
摘要
Abstract
In response to the technical challenges of coal bearing soil being prone to collapse and softening when encounte-ring water,which can cause severe settlement of the filled roadbed and slope collapse under rainfall conditions,a combina-tion of soil stabilizers and polypropylene fibers is proposed to improve the physical and mechanical properties of coal bearing soil.The microstructure changes and pore structure evolution laws of coal bearing soil improved by the combination of poly-propylene fibers and soil stabilizers with different dosages were tested by using scanning electron microscopy and low field nuclear magnetic resonance technology.The research results found that soil stabilizers can significantly improve the anti-dis-integration ability of coal bearing soil,and the dosage of soil stabilizers has a basically positive linear relationship with the shear strength of coal bearing soil.The addition of polypropylene fibers will improve the anti-disintegration ability of coal bearing soil,but there is a critical value for its dosage(0.5%in this experiment),beyond which the anti-disintegration effect of coal bearing soil will be weakened.Through microscopic analysis of SEM images and low field nuclear magnetic res-onance T2 spectrum curves,it was found that the addition of soil stabilizers and polypropylene fibers can cause soil particles in coal bearing soil to stack and rearrange in a sheet-like manner,forming a dense and stable matrix of fiber stabilizer soil particles.This coupling mechanism is the key to significantly improving the mechanical properties of coal bearing soil through joint improvement.It is feasible to combine soil stabilizers and polypropylene fibers to improve coal bearing soil,providing a new approach for improving the road properties of coal bearing soil.关键词
煤系土/联合改良/土壤稳定剂/聚丙烯纤维/核磁共振/孔隙结构演化Key words
coal bearing soil/joint improvement/soil stabilizer/polypropylene fiber/nuclear magnetic resonance/evolution of pore structure分类
建筑与水利引用本文复制引用
朱瑞,黄红元,廖良健,周子敬,张鸿..聚丙烯纤维与土壤稳定剂联合改良煤系土的力学特性与微观机理[J].南昌工程学院学报,2024,43(3):31-39,9.基金项目
国家自然科学基金资助项目(52068053) （52068053）
江西省南昌市优势科技创新团队项目(2017CXTD012) （2017CXTD012）
