冻融循环作用下土的性质对纤维水泥土力学性质的影响

为了研究冻融循环作用下土的性质对纤维水泥土力学性质的影响,以玄武岩纤维和水泥为加固材料,选取两种不同类型土体制作成试件进行无侧限抗压强度试验和冻融循环试验。通过研究发现,玄武岩纤维的加入未必能提高水泥土的强度,土体的性质是影响水泥土无侧限抗压强度的主要因素之一。冻融循环作用下土的性质对水泥土力学性质及破坏状态具有重要的影响。随着冻融循环次数的增加,水泥土的无侧限抗压强度逐渐减低,而纤维的添加可以有效降低水泥土强度损失,提高水泥土抵抗冻融循环的能力。研究结果可为冻融循环作用下玄武岩纤维水泥土力学机理的研究提供一定的理论基础,可为纤维水泥土在季节性冻土区的应用提供一定的借鉴和参考。

Influence of Soil Properties on Mechanical Properties of Fiber Reinforced Cemented Soil under Freeze- Thaw Cycling

Fiber reinforced cemented soil is a kind of new composite material which is randomly and uniformly mixed fiber into cement soil. It has the characteristics of high strength and high toughness. In this paper, basalt fiber and cement are used as reinforcement materials. Two different types of soils are selected. And a series of unconfined compressive strength test and freeze-thaw cycling tests were conducted. From the research, it is found that the addition of basalt fiber may not improve the strength of cemented soil, and the properties of soil is one of the main factors which can affect the unconfined compressive strength of cemented soil. With the increase of the number of freeze-thaw cycling, the unconfined compressive strength of cemented soil reduced gradually, and the addition of fiber can effectively reduce the strength loss of cement soil and improve the ability of cement soil to resist freeze-thaw cycling. The research in this paper can provide a theoretical basis for the study of the mechanical mechanism of basalt fiber reinforced cemented soil under freeze-thaw cycling, which can also provide a reference for the application of fiber reinforced cemented soil in seasonal frozen soil.