1.Jilin Jianzhu University;2.Huazhong University of Science and Technology
Project Supported by Education Department of Jilin Province (No. JJKH20200283KJ)
In order to study the influence of fiber content and fiber length on unconfined compressive strength characteristics of fiber reinforced cemented soil which was made of short—cut basalt fiber, cement and soil taken from Changchun, a series of unconfined compressive strength tests were carried out. The results show that the strength of basalt fiber reinforced cemented soil presents a generally convex curve with the increasing of fiber length, and the curve finally tends to the strength of cemented soil without fiber under the same fiber contents. It shows that the fiber distribution uniformity and fiber distribution density have great influence on the strength. The strength of basalt fiber reinforced cemented soil presents a wavy curve with the increasing of fiber content, the second wave peak value is less than the first wave peak value and the curve finally tends to a fixed value under the same fiber length. In practical engineering application, the fiber content of the first wave peak can be used in cemented soil reinforcement to achieve the expected reinforcement effect and reduce the project cost. At the same time, the impact of uneven mixing on the strength of cemented soil should be fully considered, and excessively long fibers should not be used for reinforcement. On the one hand, long fibers are easy to form cluster phenomenon; on the other hand, they are easy to be attached to the stirring apparatus.