土工格室加筋非饱和土三轴试验  

Triaxial Test of Geocell Reinforced Unsaturated Soil

作　　者：尹祥霁 宋飞[1,2] 孙传迪 YIN Xiang-ji;SONG Fei;SUN Chuan-di(School of Highway,Chang'an University,Xi'an 710064,Shaanxi,China;The Key Laboratory of Intelligent Construction and Maintenance of CAAC,Chang'an University,Xi'an 710064,Shaanxi,China)

机构地区：[1]长安大学公路学院,陕西西安710064 [2]长安大学民航机场智慧建造与维养重点实验室,陕西西安710064

出　　处：《地球科学与环境学报》2025年第1期56-66,共11页Journal of Earth Sciences and Environment

基　　金：国家自然科学基金项目(52278328)。

摘　　要：为探索加筋非饱和土结构的变形和破坏特征,测试了非饱和土的土-水特征曲线;同时,基于固结排水三轴试验测得不同净围压下基质吸力分别为30、80和130 kPa时非饱和素土和土工格室加筋土的应力-应变曲线,对比分析了不同基质吸力下素土和加筋土变形模量和抗剪强度指标;此外,基于三轴试验结果分析了土工格室对非饱和土的约束围压大小。结果表明:随着轴向应变的增加和净围压的减小,土工格室加筋土的变形模量提高幅度逐渐增大;非饱和土的有效内摩擦角受土工格室加筋作用的影响较小,由于土工格室的约束作用,加筋土的黏聚力和反映基质吸力对强度贡献的内摩擦角均有提高;随着非饱和土基质吸力的增加和净围压的减小,由于剪胀趋势的增强,土工格室加筋土的变形模量和表观黏聚力提高幅度逐渐增加。In order to explore the deformation and failure characteristics of reinforced unsaturated soil structure,soil-water characteristic curves of unsaturated soil were tested;stress-strain curves of unsaturated soil and reinforced soil with matrix suctions of 30 kPa,80 kPa and 130 kPa,respectively under different confining pressures were measured based on the consolidated drainage triaxial test;deformation modulus and shear strength indexes of soil and reinforced soil under different matrix suctions were compared and analyzed;based on the triaxial test results,the confining pressure of geocell on unsaturated soil was analyzed.The results show that with the increase of axial strain and the decrease of confining pressure,the increase of deformation modulus of reinforced soil in geocell gradually increases;the effective internal friction angle of unsaturated soil is less affected by the reinforcement effect of the geocell;due to the restraint effect of the geocell,the cohesion of the reinforced soil and the internal friction angle reflecting the contribution of matrix suction to the strength increase;with the increase of matric suction and the decrease of confining pressure of unsaturated soil,the deformation modulus and apparent cohesion of reinforced soil in geocell increase gradually due to the enhancement of dilatancy trend.

关 键 词：土工格室 非饱和土 三轴试验 土-水特征曲线 基质吸力 抗剪强度 

分 类 号：U414[交通运输工程—道路与铁道工程]