Effect of different fibers on small-strain dynamic properties of microbially induced calcite precipitation–fiber combined reinforced calcareous sand
Effect of different fibers on small-strain dynamic properties of microbially induced calcite precipitation–fiber combined reinforced calcareous sand
复制标题
不同纤维对微生物诱导方解石沉淀—纤维复合增强钙质砂小应变动力性能的影响
DOI：
10.1016/j.conbuildmat.2022.126343
复制
发表时间：
2022-03
影响因子：
7.4
通讯作者：
Jitong Zhao
中科院分区：
文献类型：
--
作者：
Yi Shan;Junling Liang;Huawei Tong;Jie Yuan;Jitong Zhao
微生物诱导方解石沉淀(MICP) -纤维复合加固是一种新型、自然、绿色的地基加固技术，可有效提高水泥土的力学性能。然而，这种方法的小应变动态特性仍未被探索。采用共振柱试验、扫描电镜（SEM）和原子力显微镜（AFM）研究了不同聚酯纤维和大麻纤维含量（0%、0.1%、0.2%和0.4%）对micp -纤维复合增强灰质砂小应变动态性能的影响。小应变下mmic -纤维复合增强钙质砂的最大动剪切模量随纤维含量的增加而增大；两种纤维的加入均增加了试样动剪切模量比的刚度退化率，大麻纤维的加入大大提高了阻尼比的增加率。SEM结果表明，分布在砂粒之间的过量纤维占据了细菌的成核位点，阻碍了砂粒之间的结合，最终影响了样品的动剪切模量参数。AFM结果表明，大麻纤维的表面粗糙度比聚酯纤维大得多。因此，大麻纤维掺杂micp纤维复合增强钙质砂的阻尼比变化率远大于聚酯纤维掺杂样品。本文首次报道了不同纤维含量和类型的micp -纤维复合增强钙质砂小应变动态特性的基本机理。为改善砂土的动力特性从而进行加固的相关研究提供了新的理论依据。
Microbially induced calcite precipitation (MICP)–fiber combined reinforcement through the addition of fibers during the MICP process is a novel, natural, and green technique for foundation improvement, which can effectively enhance the mechanical properties of cemented soil. However, the small-strain dynamic properties of this method remain unexplored. The effects of different polyester fiber and hemp fiber contents (0%, 0.1%, 0.2%, and 0.4%) on the dynamic properties of the MICP–fiber combined reinforced calcareous sand under small-strain conditions were studied using resonant column tests, scanning electron microscopy (SEM), and atomic force microscopy (AFM). The maximum dynamic shear modulus of the MICP–fiber combined reinforced calcareous sand under small-strain increases with the fiber content; the stiffness degradation rate of the dynamic shear modulus ratio of the test sample increases with the addition of two types of fibers, and the addition of hemp fibers greatly boosts the increase rate of the damping ratio. The SEM results indicate that excessive fibers distributed between the sand particles occupy the nucleation sites of bacteria, hinder the bonding between sand particles, and ultimately affect the dynamic shear modulus parameters of the sample. The AFM results show that the hemp fiber has much greater surface roughness than the polyester fiber. Therefore, the change rate of the damping ratio of the hemp fiber-doped MICP–fiber combined reinforced calcareous sand is much greater than that of the polyester fiber-doped sample. This is the first report on the basic mechanism of the small-strain dynamic properties of the MICP–fiber combined reinforced calcareous sand with different fiber contents and types. Furthermore, it provides a new theoretical basis for related research on improving the dynamic properties of sand thus reinforced.
登录
查看更多内容
影响因子：
2.7
作者：
W. V. Wijngaarden;F. Vermolen;G. V. Meurs;C. Vuik
通讯作者：
W. V. Wijngaarden;F. Vermolen;G. V. Meurs;C. Vuik
影响因子：
2.3
作者：
Whiffin, Victoria S.;van Paassen, Leon A.;Harkes, Marien P.
通讯作者：
Harkes, Marien P.
影响因子：
4
作者：
A. Morsy;M. Salem;H. Elmamlouk
通讯作者：
A. Morsy;M. Salem;H. Elmamlouk
影响因子：
5.8
作者：
Giretti, D.;Fioravante, V.;Dickenson, S.
通讯作者：
Dickenson, S.
DOI：
10.1061/(asce)mt.1943-5533.0002841
发表时间：
2019-09-01
影响因子：
3.2
作者：
Choi, Sun-Gyu;Hoang, Tung;Chu, Jian
通讯作者：
Chu, Jian