玻璃纤维改良流态固化土的力学强度与水稳性研究
Study on the Mechanical Strength and Stability of Glass Fiber Modified Fluidized Solidified Soil
於德美 1邵玉玲 2冯超 2张恒春 3张峰 3王耀 4付腾飞2
作者信息
- 1. 福建农林大学交通与土木工程学院,福州 350108;中建海峡建设发展有限公司,福州 350015
- 2. 福建农林大学交通与土木工程学院,福州 350108
- 3. 中建海峡建设发展有限公司,福州 350015
- 4. 中建海峡建设发展有限公司,福州 350015;中国建筑股份有限公司,北京 100029
- 折叠
摘要
流态固化土因具有良好的流动性可应用于狭小空间的回填,外掺玻璃纤维可有效改善其力学性能和水稳性.为了解纤维加筋流态固化土的固化效果,在流态固化土中分别外掺0.1％～0.5％g/cm3的玻璃纤维,并对掺纤维试件进行抗压、抗折强度试验、水稳性试验和SEM微观测试.结果表明:随着玻璃纤维掺量的增加,流态固化土的流动度逐渐下降;当玻璃纤维掺量为0.4％g/cm3时,28 d抗压、抗折强度达到峰值,比同龄期未掺纤维的试件抗压和抗折分别提升了 13.4％、58.1％;玻璃纤维掺量为0.3％g/cm3时,28 d水稳系数达到峰值,比同龄期未掺纤维试件的水稳系数提高了23.1％;纤维交错搭接形成纤维网状结构和纤维对土体的锚固力是纤维增强土体力学性能的作用机制.
Abstract
The fluid solidified soil can be used in the narrow space because of its good fluidity,and the external fiber can effectively improve its mechanical properties and water stability.In order to understand the curing effect of fiber reinforced fluidized solidified soil,0.1％～0.5％glass fiber was mixed into the fluidized solidified soil,and compressive and flexural strength tests,water stability tests and SEM microscopic tests were carried out on the fiber-doped specimens.The results show that with the increase of glass fiber content,the fluidity of fluidized solidified soil decreases gradually.When the glass fiber content was 0.4％,the compressive strength and flexural strength of 28 d reached the peak,which were in-creased by 13.4％and 58.1％respectively compared with the specimens without fiber at the same age.When the glass fi-ber content was 0.3％,the 28-day water stability coefficient reached the peak,which was 23.1％higher than that of the unmixed fiber specimens of the same age.The staggered overlapping of fibers forms a fiber network structure and the an-choring force of fibers on soil is the mechanism of action of fiber-enhanced soil mechanical properties.
关键词
流态固化土/流动度/力学强度/水稳性/微观结构Key words
solidified soil/fluidity/mechanical strength/water stability/microstructure引用本文复制引用
出版年
2024
NETL
NSTL
万方数据