长江科学院院报2024，Vol.41Issue(12)：147-154,8.DOI:10.11988/ckyyb.20231116
交联生物聚合物增强粉土抗压及抗剪强度的机理
Mechanism of Crosslinked Biopolymers Reinforcing Compressive and Shear Strength of Silty Soil
摘要
Abstract
Cement,currently a widely utilized soil reinforcement material,elevates soil pH and poses potential risks of groundwater contamination during application.This study employed three environmentally friendly materials,namely,γ-polyglutamic acid(γ-PGA),β-glucan,and a cross-linked γ-PGA-β-glucan mixture(γ-PGA-β-G crosslinker),to reinforce silty soil.The mechanism by which cross-linked biopolymers enhance the compressive and shear strength of silty soil was examined through unconfined compressive strength tests,direct shear tests,Fourier transform infrared spectroscopy(FTIR)characterization,and scanning electron microscopy(SEM)observations before and after reinforcement.Results indicated that the compressive and shear strengths of the silty soil reinforced with cross-linked biopolymers outperformed those reinforced with single biopolymers.The dosage of the cross-linked biopolymer and the age of maintenance significantly influenced the improvement effect.Longer maintenance periods better enhanced silty soil.Within a certain dosage range,the strength of silty soil positively correlated with the dos-age.Specifically,a 1.5％ratio provided optimal unconfined compressive strength for γ-PGA-β-G-improved silt,with the 28-day maintenance strength reaching 47.07 kPa,a 1.43-fold increase over untreated silt.The y-PGA-β-G cross-linked biopolymers effectively augmented the cohesion and internal friction angle of silt.This enhancement mechanism is attributed to the three-dimensional mesh structure formed by the crosslinks,which exhibits superior mechanical properties and envelops the silt particles,thereby significantly boosting the silt's strength.关键词
粉土/γ-聚谷氨酸/β-葡聚糖/γ-PGA-β-G交联物/无侧限抗压强度/抗剪强度Key words
silty soil/γ-polyglutamic acid/β-glucan/γ-PGA-β-G crosslinked biopolymer/unconfined compres-sive strength/shear strength分类
建筑与水利引用本文复制引用
杨海涛,谢建斌,江珊汕,张浩南,李志源,叶宗昂..交联生物聚合物增强粉土抗压及抗剪强度的机理[J].长江科学院院报,2024,41(12):147-154,8.基金项目
国家自然科学基金项目(11862024) （11862024）
