麦秸秆加筋土的合理布筋位置和抗剪强度模型  

REASONABLE REINFORCEMENT POSITION AND SHEAR STRENGTH MODEL OF REINFORCED SALINE SOIL WITH WHEAT STRAW AND LIME

作　　者：李敏[1] 柴寿喜[2] 杜红普[3] 魏丽[2] 石茜[1] 

机构地区：[1]兰州大学西部灾害与环境力学教育部重点实验室,甘肃兰州730000 [2]天津城市建设学院天津市软土特性与工程环境重点实验室,天津300384 [3]河北工业大学土木工程学院,天津300401

出　　处：《岩石力学与工程学报》2010年第A02期3923-3929,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(40772166);天津市自然科学基金资助项目(07JCYBJC12900)

摘　　要：利用三轴压缩试验,研究上部均匀布筋、整体均匀布筋和下部均匀布筋3种布筋位置的麦秸秆加筋石灰土的应力应变和抗剪强度特性。同时,借助WU模型理论探讨麦秸秆加筋土的强度模型。结果表明:(1)麦秸秆的3种布筋位置均能提高石灰土的抗剪强度和抗变形能力;(2)不同的布筋位置对加筋土的内摩擦角改变较小,对黏聚力的增长影响较大;(3)下部均匀布筋加筋土的抗剪强度指标高于整体均匀布筋的和上部均匀布筋的,将麦秸秆置于下部土中有利于加筋作用的发挥;(4)麦秸秆加筋土的强度模型显示,强度的提高与麦秸秆的分布方式有关。研究结果对认识天然纤维加筋土的强度增长和抗变形机制具有指导作用。Triaxial compression tests of reinforced saline soil with wheat straw and lime,reinforced uniformly at upper,lower and whole positions,were carried out to research the effect of reinforced position on stress-strain and shear strength characteristics. Moreover,strength model of reinforced saline soil with wheat straw and lime was discussed by WU model theory. The results show as follows：（1） Shear strength and anti-deformation capacity of lime soil in three reinforced positions are improved. （2） Reinforced position is related to the increase in cohesion, but has little effect on the internal friction angle. （3） Shear strength of reinforced saline soil with reinforcement in lower position is larger than that in whole and upper positions;and the reinforcement of lower position is helpful to the reinforcement function. （4） Strength model of reinforced soil with wheat straw shows that strength of reinforced soil is closely related to the distribution pattern of wheat straw. The research results are of important guidance for understanding the reinforcement mechanism of reinforced soil with natural fiber material.

关 键 词：土力学 加筋位置 强度模型 加筋土 应力–应变 抗剪强度 麦秸秆 

分 类 号：TU443[建筑科学—岩土工程]