【摘要】 为了提高隧道用水泥土的力学性能，选择P.O42.5硅酸盐水泥为基体，掺入不同条件的聚乙烯醇(PVA)纤维进行加强，并开展无侧限抗压强度实验分析。研究结果表明：纤维水泥土孔隙在水化产物作用下填充效果更佳，组织更致密，外部载荷不易对整体结构造成影响，抗压缩变形效果表现更佳。掺入不同比例的PVA纤维后含水量基本处于30%上下，初始孔隙率变化区间为0.805～0.868。向水泥土中将不同比例纤维掺入后，其压缩系数增大。相比较素水泥土，掺入PVA纤维水泥土压缩系数均发生明显最低。综合考虑，选取掺入9 mm是较为优秀的。当提高PVA纤维比例时，最高压缩模量Es先增大再降低，PVA纤维水泥土的Es值对应0.75%掺入比时到达最大值。本研究开发了一种新型纤维水泥土，对加强水泥土综合性能具有很好的应用价值。更多还原

【Abstract】 In order to improve the mechanical properties of cement soil in the tunnel, P.O42.5 Portland cement was selected as the matrix, and polyvinyl alcohol(PVA) fibers under different conditions were added for strengthening, and unconfined compressive strength test was carried out. The results show that the porosity of fiber cement soil is better filled with hydration products, the structure is more compact, the external load is not easy to affect the overall structure, and the anti-compression deformation effect is better. The water content of PVA fiber was basically around 30%, and the initial porosity varied from 0.805 to 0.868. When different proportions of fiber are added to cement soil, its compression coefficient increases. Compared with plain soil-cement, the compression coefficient of soil-cement mixed with PVA fiber is obviously the lowest. Overall consideration, the selection of 9mm is more excellent. When the proportion of PVA fiber is increased, the maximum compression modulus Es first increases and then decreases, and the Es value of PVA fiber cement soil reaches the maximum value corresponding to 0.75% incorporation ratio. In this study, a new type of fiber cement soil was developed, which has a good application value to strengthen the comprehensive properties of cement soil.更多还原