玻璃纤维对湿陷性黄土力学性能的影响研究

Study on the Influence of Glass Fibre on the Mechanical Properties of Collapsible Loess

以青海东部的湿陷性黄土为研究对象,研究玻璃纤维掺量、水泥掺量、养护期龄和土壤含水率对湿陷性黄土力学性能的影响。结果表明,相同含水率条件下,湿陷性黄土的抗压强度、劈裂抗拉强度和静力弹性模量随玻璃纤维掺量的增加先增大后减小,玻璃纤维掺量为2%时均达到最大值,超过2%时,各养护龄期的黄土力学性能开始下降;土壤含水率超过40%时,水泥掺量越高黄土力学性能越好;影响黄土力学性能的主要因素为玻璃纤维掺量>水泥掺量>养护期龄>土壤含水率;玻璃纤维掺量、水泥掺量分别为2%、7%,含水率为40%,养护期龄为28 d时,湿陷性黄土力学性能最佳。

Taking collapsible loess in eastern Qinghai as the research object,the effects of glass fibre content,cement content,curing period and soil moisture content on the mechanical properties of collapsible loess are studied.The results show that,(a)under the same water content,the compressive strength,splitting tensile strength and static elastic modulus of collapsible loess increase first and then decrease with the increase of glass fibre content,and the mechanical properties of loess reach maximum values when the glass fibre content is 2%and begin to decline when the glass fibre content exceeds 2%at various curing period;(b)when the soil moisture content exceeds 40%,the higher the cement content,the better the mechanical properties of the loess;(c)the influence of the main factors affecting the mechanical properties of loess in descending order is as follows:glass fibre content,cement content,curing age,and soil moisture content;and(d)when the glass fibre content,cement content,water content and curing age are 2%,7%,40%and 28 d respectively,the mechanical properties of collapsible loess reach the best.