洞庭湖区淤泥质黏土水泥土力学性能试验研究

发布时间：2018-11-20 16:16

【摘要】：结合湖南洞庭湖区某高速公路淤泥质黏土软基处理工程,进行淤泥质黏土水泥改良土的无侧限抗压强度试验,研究水泥土无侧限抗压强度的影响因素、水泥土的应力应变关系和变形模量的变化规律以及试样的破坏模式。研究结果表明:淤泥质黏土水泥土的无侧限抗压强度随着养护龄期和水泥掺入比的增加而增加,随着含水率的增大而减小;无侧限抗压强度增长速率随着养护龄期的增大而减小,随着水泥掺入比的增大而增大;水泥土应力应变全过程曲线可以分为加载初始阶段、塑性上升阶段、应力~应变下降阶段和残余强度阶段等4个阶段;水泥土的变形模量随着水泥土的无侧限抗压强度的增大而增大;含水率高、水泥掺入比低和龄期短的试件呈现塑性破坏,而含水率低、水泥掺入比高和龄期长的试件呈现脆性破坏。
[Abstract]:Combined with the soft foundation treatment project of a highway silt clay in Dongting Lake District, Hunan Province, the unconfined compressive strength test of the silt clay cement modified soil was carried out, and the influencing factors of the unconfined compressive strength of the cement soil were studied. The relationship between stress and strain, the variation of deformation modulus and the failure mode of cement soil. The results show that the unconfined compressive strength increases with the increase of curing age and cement ratio, and decreases with the increase of water content. The increasing rate of unconfined compressive strength decreases with the increase of curing age and increases with the increase of cement ratio. The whole stress-strain curve of cement-soil can be divided into four stages: initial loading stage, plastic rising stage, stress-strain decreasing stage and residual strength stage. The deformation modulus of cement-soil increases with the increase of unconfined compressive strength of cement-soil. The specimens with high moisture content, low cement blending ratio and short age showed plastic failure, while those with low moisture content and high cement blending ratio and long age showed brittle failure.
【作者单位】：中南大学土木工程学院;
【基金】：国家自然科学基金资助项目(50678175) 中南大学实验室开放专项基金资助项目
【分类号】：U416.1;U412.22

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