纤维对水泥土加固效果影响的试验研究

将短切玄武岩纤维和水泥掺入取自长春地区的黄土中，进行无侧限抗压强度试验。主要研究纤维掺量、纤维长度对纤维水泥土无侧限抗压强度特性的影响。试验结果表明：同一纤维质量掺入比下，随着纤维长度的增加，纤维水泥土抗压强度大体呈上凸型曲线形式，曲线最终趋于无纤维掺入的水泥土强度，说明纤维分布均匀性和纤维分布密度对强度影响较大；同一纤维长度下，纤维水泥土强度随纤维质量掺入比的增大呈波浪型曲线形式发展，第1次波峰值大于第2次波峰值，曲线最终趋于某个固定值，在实际工程应用中，可采用初次波峰的掺入量进行水泥土加固，达到预期加固效果的同时，能够大幅降低工程造价；同时，要充分考虑搅拌不均匀性对水泥土强度带来的影响，且不宜采用过长的纤维进行加固，一方面容易形成集束现象，另一方面容易连挂在搅拌器械上。

Experimental study on the reinforcement effect of fiber on cemented soil

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 increase of fiber length, and the curve finally tends to be 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 increase of fiber content under the same fiber length, the second wave peak value is less than the first wave peak value and the curve finally tends to a constant value. 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. Meanwhile, the impact of uneven mixing on the strength of cemented soil should be fully considered, and excessively long fibers should not be used. On the one hand, long fibers are easy to produce cluster phenomenon; on the other hand, they are easy to be attached to the stirring apparatus.