岩土力学2025，Vol.46Issue(11)：3410-3420,11.DOI:10.16285/j.rsm.2024.1497
微生物加固珊瑚砂动剪切模量与阻尼比特性研究
Experimental investigation on dynamic shear modulus and damping ratio of biocemented coral sand
摘要
Abstract
The microbially induced calcite precipitation(MICP)technique can effectively enhance the mechanical properties of coral sand.To investigate the small-strain dynamic characteristics of MICP-treated coral sand,resonant column tests were conducted on specimens with varying biocementation cycles Nb and effective confining pressures σʹ0 and the development laws of dynamic shear modulus G and damping ratio λ were comparatively analyzed.The test results reveal that:at small strains,the dynamic shear modulus G increases significantly with both Nb and σʹ0.The maximum dynamic shear modulus Gmax exhibits a linear correlation with Nb and a power-law correlation with σʹ0.A significant power-law relationship exists between Gmax and unconfined compressive strength(qucs).As Nb increases,the reference strain γ0 decreases gradually while the G/Gmax-γd curves shift downward,indicating enhanced nonlinearity.Both minimum and maximum damping ratios increase,with the λ-γd curve moving upward and characterized by greater energy dissipation.In contrast,increasing σʹ0 produces opposite trends in both G/Gmax-γd and λ-γd curves,exhibiting reduced nonlinearity and energy dissipation.Empirical relationships are established to quantify the nonlinear dynamic behavior and energy dissipation characteristics of MICP-treated coral sand.Scanning electron microscope(SEM)observations reveal that stiffness improvement primarily results from three mechanisms:contact cementation between sand grains,grain coating by calcite precipitates,and matrix supporting through pore filling.关键词
珊瑚砂/微生物诱导碳酸钙沉淀/共振柱试验/动剪切模量/阻尼比Key words
coral sand/microbially induced calcite precipitation/resonant column tests/dynamic shear modulus/damping ratio分类
建筑与水利引用本文复制引用
刘璐,李帅学,张鑫磊,高洪梅,王志华,肖杨..微生物加固珊瑚砂动剪切模量与阻尼比特性研究[J].岩土力学,2025,46(11):3410-3420,11.基金项目
国家自然科学基金(No.52008207,No.52108324).This work was supported by the National Natural Science Foundation of China(52008207,52108324). （No.52008207,No.52108324）
