风化砂岩的力学特性及本构关系研究.pdf

第30卷增刊岩土力学 Supp. 2009年8月 Rock and SoilMechanics 文章编号l1000--7598一(2009)增l一0033—04 风化砂岩的力学特性及本构关系研究张卫中1’2,陈从新2,余明远1 (,武汉430074;,武汉430071) 麓蔓:以不同风化程度的砂岩试件为研究对象,对其单轴、三轴力学强度进行了试验研究。结果表明,随着风化程度的增加,砂岩的力学强度逐渐降低;三轴曲线的主应力差(仉一氓)对砂岩强度的影响基本呈线性;不同风化程度的砂岩试件的内摩擦角随着风化程度的增加,摩擦角逐渐增大;而凝聚力则随着风化程度的增加而减小。建立了岩石三轴受力的抛物曲线一线弹性-,模型能够正确反映砂岩三轴受力变形特点。关键词:风化;砂岩;强度;5段式模型中图分类号。Tu 431 文献标识码:A Study ofmechanical properties and constitutive relation ofweathered sandstone ZHANG ,CHEN Cong—xin2,YU ( andAdministration,ZhongnanUniversityofEconomics andLaw(ZUEL),Wuhan430074,China; andSoilMechanics,ChineseAcademyofSciences,Wuhau430071,China) Abstract:Both uniaxialand uiaxial mechanical strengths ale studiedunder different weathering degrees show thatsandstone strength decreases astheweathering degree increases;the effect on thestrength ofsandstone caused by principal stress difference linearessentially;intemai friction angle ofsandstone increases and cohesion decreases as the weathering degree increases;the constitutive relafion of5segments curves ofsandstone better inreflecting the characteristics oftriaxialstrength experiment. Key words:weathering;sandstone;strength;model of5segments 1 引言地壳中的岩石,无时无刻不遭受着来自太阳辐射能量、风力、水等的作用,因而容易