Study On The Strength Characteristics Of Natural Fiber Reinforced Soil

The mechanical strength of soil is an important factor in engineering safety.It has always been paid attention by researchers in the field of civil engineering.How to improve the mechanical strength of soil has become a keen research topic.Reinforced earth technology provides many excellent solutions for solving various technical problems in engineering practice and is widely used.In this paper,wheat straw,straw and basalt fiber reinforced materials are taken as the research objects,and the unconfined compressive strength test is used to compare the optimal reinforcement method,deformation failure characteristics and reinforcement mechanism of different materials reinforced soil The results are as follows:(1)Wheat straw,straw and basalt fiber reinforced soil all have the optimal mix ratio.According to the unconfined compressive strength test results,the optimal reinforcement rate of wheat straw reinforced soil is 0.3%,the optimal The reinforced length is 20mm;the optimal reinforcement rate of straw-reinforced soil is 0.2% and the optimal reinforcement length is 20mm;the optimal reinforcement rate of basalt fiber-reinforced soil is 0.4% and the optimal reinforcement length is 16 mm.(2)The stress-strain curves of the reinforced soil are softened under different reinforcement conditions.The three reinforced materials all increase the unconfined compressive strength of the soil and effectively limit the tendency of soil deformation and failure.(3)Comparing the stress-strain and failure characteristics of the three types of reinforced soil,basalt fiber has the strongest energy absorption capacity,followed by wheat straw,and straw.Basalt fiber reinforced soil has the strongest resistance to deformation and the most significant improvement effect on soil.(4)For the unevenness and roughness of the surface of the three kinds of reinforced materials,SEM images of different materials show that straw is the roughest,followed by wheat straw,and the basalt fiber is relatively smooth.However,due to the strong adsorption of basalt fibers,the contact with the clay particles is the best.(5)Through the two-factor analysis of variance,we can see that the reinforcementratio and length have a significant effect on the compressive strength index,but the two-factor interaction of straw and wheat straw materials has little effect,and the basalt fiber is more significant.(6)The mechanical properties and corrosion resistance of basalt fibers are better than wheat straw and straw,and more suitable for soil improvement in complex geological environments,while wheat straw and straw are suitable for soil that can achieve the expected consolidation effect in a short period of time.body.