Effect of coir fiber length on shear strength and compressive strength of soil
[Objective]Fiber material is one of the main materials for soil spraying in slope vegetation restora-tion.The aim of the study is to investigate the The influence of the length of fiber material added to the soil spray-sown substrate on the shear strength and compressive strength of soil.[Method]This paper adopted the test method of control variables.The indoor triaxial test and unconfined compression test were carried out by mixing coconut fiber and sand soil of different lengths(1,2,3,4,5 cm)at the mass ratio of 0.4%(w/w).[Result]The results of the study showed that:(1)The peak strength of the principal stress difference and the peak compressive strength of each length treatment at each circumferential pressure were greater than those of the plain soil without fiber reinforcement,and both could effectively improve the residual strength of the soil body after shear and compression damage,indicat-ing that the addition of coir fibers could effectively improve the strength and toughness of the soil body.(2)With the increase of fiber length,the principal stress difference peak strength,cohesion,internal friction angle and reinforce-ment effect coefficient all showed a trend of increasing and then decreasing,and the strength reached the peak at the length of 3～4 cm.This fully indicated that there was an optimal length for the effect of fiber length on soil stability.(3)At the same time,the peak compressive strength,the peak principal stress difference strength and the residual strength after damage all increased significantly with increasing fiber length,and the stress-strain curve gradually changed from a strain-softening type to a strain-hardening type.[Conclusion]When the content of coir fiber is 0.4%and the length of coir fiber is 3～4 cm,the shear strength and compressive strength of soil can be effectively im-proved.
万方数据
维普
