水泥土是指由水泥、土和水按一定比例混合的多相混合体,水泥土的残余强度是表征其力学特性的重要指标,准确地描述水泥土的残余强度具有重要意义.为定量分析水泥土的残余强度特性,引入了脆性指标,并通过室内三轴压缩试验,研究了水泥掺量、围压和龄期对水泥土抗剪强度和脆性指标的影响.试验结果表明,随水泥掺量、围压和龄期增大,水泥土峰值强度和残余强度均增大;不同水泥掺量水泥土峰值内摩擦角与残余内摩擦角相差不大;随水泥掺量和龄期增大,水泥土脆性指标逐渐增大,脆性越强,而随围压增大,脆性指标逐渐减小,塑性越明显.%The cement soil was defined by cement,soil and water were mixed according to a certain proportion of the complex mixture,the residual strength of cement soil was an important index to characterize its mechanical properties,has important significance to accurately describe the residual strength of the cement soil for the quantitative analysis of the residual strength characteristics of soil cement.In order to quantitatively analyze the residual strength of cemented soil,the brittleness index was introduced and the influence of cement content,confining pressure and age on the shear strength and brittleness index of cemented soil was studied by indoor triaxial compression test.The test results show,the peak strength and residual strength of the cement soil increased with the increase of cement content,ages and confining pressure,the difference between the peak friction angle residual friction angle are small;The brittleness index of the cement soil gradually increased with the increase of cement content and ages,the stronger brittleness are shown in the cement soil.The brittleness index of the cement soil gradually decreased with the increase of confining pressure,the cement soil tend to be plasticity.
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