水泥土剪切破坏特性与剪破角试验研究  

Study on Characteristic of Shear Fracture and Inclination Angle of Shear Band of Cement-soil

作　　者：钱财富[1] 宋新江[1] 徐海波[1] 吴杰[1] 周文渊[1] 

机构地区：[1]安徽省(水利部淮河水利委员会)水利科学研究院,安徽蚌埠233000

出　　处：《水电能源科学》2017年第3期130-133,共4页Water Resources and Power

基　　金：安徽省自然科学基金项目(1408085ME99);水利部公益性行业科研专项(201401022)

摘　　要：为了解不同条件下水泥土的剪切破坏特性和剪破角的变化规律,通过无侧限抗压强度试验、CD试验和平面应变试验对其进行研究。结果表明,水泥土无侧限抗压强度试验的试样以劈裂破坏为主,破坏应变略大于1%,残余强度较低,破坏剪切面呈不规则形状;CD试验破坏强度、破坏应变和残余强度均随围压的增加而增大,试样为剪切破坏,剪切面规则且较光滑,剪破角与围压近似呈线性关系;平面应变试验水泥土强度约为CD试验的1.4~1.6倍,破坏应变和残余强度较CD试验偏小,试样为剪切破坏,剪切面规则且较光滑,剪破角与围压近似呈幂函数关系。对比分析三种剪破角计算理论值与实测值,认为Mohr-Coulomb理论较Roscoe理论和Arthur经验公式更适合预测水泥土的剪破角,研究结果为以后水泥土剪切破坏特性与剪破角研究提供了借鉴。In order to study the shear failure characteristics and change law of inclination angle of shear band in cement-soil,unconfined compressive strength tests,plane-strain tests and CD tests were carried out.The results show that the failure mode of cement-soil is splitting;failure strain is more than 1%,the residual strength is lower,the surface of shear is irregular shape;under the consolidated drained triaxial（CD）tests,fracture strength,fracture stress and the residual strength increase with the increasing of confining pressure.Under the CD and plane strain conditions,the failure mode is sheared;the surface of shear is regular shape.The inclination angle of shear band has a linear negative correlation with confining pressure under CD condition and has a lower power function correlation with confining pressure under plane strain state.The strength of cement-soil under plane strain state is 1.4-1.6times under CD condition.The middle principle stress has a positive correlation with inclination angle of shear band in the same condition.The Mohr-coulomb theory is more suitable for predicting the failure angle of cement-soil than the Roscoe theory and Arthur empirical formula.The research results can provide reference for similar study on shear fracture and inclination angle of shear band of cementsoil.

关 键 词：水泥土 无侧限抗压强度试验 CD试验 平面应变试验 剪切破坏 剪破角 

分 类 号：TU502.61[建筑科学—建筑技术科学]