红黏土与混凝土接触面剪切特性试验研究

发布时间：2018-08-26 17:43

【摘要】：采用大型直剪仪进行红黏土与混凝土接触面的单向直剪试验,研究不同法向应力与混凝土表面、不同粗糙度条件下接触面的力学特性,对红黏土与混凝土接触面的应力、应变及破坏形式进行分析。研究结果表明:随着接触面粗糙度的增大,接触面的抗剪强度以及残余强度增大,黏聚力增大,内摩擦角减小;在剪切初始,法向位移随着切向位移的增大而减小,表现为剪缩,之后随着切向位移的继续增大,法向位移增大,表现为剪胀,剪胀速率基本相同;在剪缩阶段,剪缩速率随着法向应力或粗糙度的增大而增大;在剪胀阶段,剪胀速率也随着粗糙度的增大而增大,随着法向应力的增大,剪胀速率基本不变。
[Abstract]:The unidirectional direct shear test of the interface between red clay and concrete was carried out by using a large direct shear apparatus. The mechanical properties of the interface under different normal stresses and concrete surfaces and different roughness conditions were studied, and the stresses of the red clay and concrete interface were studied. Strain and failure form are analyzed. The results show that the shear strength and residual strength of the contact surface increase, the cohesion force increases and the internal friction angle decreases with the increase of the roughness of the contact surface, and at the initial shear, the normal displacement decreases with the increase of the tangential displacement. The normal displacement increases with the increase of tangential displacement, and the shear expansion rate is basically the same; in the shearing contraction stage, the shear shrinkage rate increases with the increase of normal stress or roughness; in the shearing expansion stage, the shear shrinkage rate increases with the increase of normal stress or roughness; in the shear expansion stage, the shear expansion rate increases with the increase of normal stress or roughness. The shear expansion rate also increases with the increase of roughness, and with the increase of normal stress, the shear expansion rate is basically unchanged.
【作者单位】：中南大学土木工程学院;中铁第五勘察设计院集团有限公司;
【基金】：国家自然科学基金资助项目(51378514) 高速铁路建造技术国家工程实验室基金资助项目(2008G031-Q)~~
【分类号】：TU446

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