Mechanical properties and microscopic mechanism of improving coal bearing soil by combining polypropylene fiber and soil stabilizer
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.
coal bearing soiljoint improvementsoil stabilizerpolypropylene fibernuclear magnetic resonanceevolution of pore structure
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