铁道科学与工程学报2025，Vol.22Issue(5)：2151-2167,17.DOI:10.19713/j.cnki.43-1423/u.T20241148
纤维加筋固化轻质土力学特性及其本构模型研究
Mechanical properties and constitutive model of fiber-reinforced solidified lightweight soil
摘要
Abstract
Interfacial interaction between fiber and soil is a key factor governing the effectiveness of fiber reinforcement.Understanding the process of force generation and transfer between reinforcement/soil contact surfaces is of great practical significance for the rational and efficient use of engineering properties of fiber-reinforced soils.Firstly,by means of the proposed single/multiple fiber pull-out test method and device,the interfacial mechanical behavior between fiber and solidified lightweight soil matrix was quantitatively analyzed.Secondly,a series of triaxial shear tests were conducted on fiber-reinforced solidified lightweight soils,to reveal the effects of different fiber mixing ratios and lengths on stress-strain relationship and shear strength index.Finally,based on the structural Cambridge model,a constitutive model which can accurately characterize the effect of fiber-reinforced matrix was put forward.The feasibility of the above-mentioned model was discussed.The results show that the single-fiber tensile curves under different embedment lengths and laying angles all exhibited typical single-peak characteristics.In fact,fiber fracture damage occurs in a large number of specimens at the ages of 28 d and 60 d.Whereas,the tensile curves of reinforcement interface with multiple fiber counts show multi-peak attenuation characteristics.Furthermore,the mixed fiber can make the stress-strain relationship change from weakly softening to hardening.The shear strength envelope of basalt fiber-reinforced solidified lightweight soil is an"up-warped"fold line with an obvious turning point.On this basis,the geometric parameters that can describe the effects of solidified lightweight soil and fiber reinforcement are introduced into the structural Cambridge model(SCC).As a consequence,a modified elastoplastic constitutive model of SCC,which can reflect the hardening and softening behavior of fiber-reinforced solidified lightweight soil,is further constructed.The research results can provide theoretical references for optimized design of reinforced soil in practical engineering.关键词
纤维加筋固化轻质土(BF-SLS)/界面作用力/全曲线方程/剪切力学特性/修正SCC模型Key words
basalt fiber-reinforced solidified lightweight soil(BF-SLS)/interfacial force/full curve equation/shear mechanical properties/modified SCC model分类
建筑与水利引用本文复制引用
杨少坤,杨爱武,任鹏,任毅青..纤维加筋固化轻质土力学特性及其本构模型研究[J].铁道科学与工程学报,2025,22(5):2151-2167,17.基金项目
国家自然科学基金资助项目(42177119,42377141) （42177119,42377141）
陆军工程大学青年自主创新基金资助项目(KYXZJKQTZQ24001) （KYXZJKQTZQ24001）
