昔格达组粉砂岩与结构接触面力学特性试验研究

    EXPERIMENTAL STUDY ON MECHANICAL BEHAVIOR OF XIGEDA FORMATION SILTSTONE AND STRUCTURE INTERFACE

    • 摘要: 以攀枝花钢铁集团西昌钒钛资源综合利用项目建设中典型的昔格达组中风化粉砂岩为对象,进行了重塑土与混凝土压密,原状土与混凝土浇筑两种不同方式形成接触关系的环剪试验。对两种工况接触面下,剪切应力-剪切位移、竖向应变-剪切位移和抗剪强度特性分析表明:接触面剪切变形引起法向变形,随着法向应力的增加剪切引起的法向变形增大,在法向应力在400kPa时,最大法向应变高达6.8%; 接触面采用浇筑形式形成时,接触面上的土体由于水泥浆的渗入形成强度较高的一个薄层土带,此时接触面破坏发生在土体内部; 当接触面采用压密形成时,摩擦角与土体的内摩擦角接近,而接触面的黏聚力近似可以忽略。

       

      Abstract: A series of ring shear tests are carried out to study the shear behavior of two types of interfaces between Xigeda siltstone and concrete. The siltstone-concrete interfaces are made by pouring cement mortar on siltstone or compacting remolded soil and cement block. Results present the interface shear behavior in forms of shear stress-shear strain curves, vertical strain-shear strain curves and shear strength parameters. Results show that shear deformation causes normal deformation. As the normal stress increases, this effect is more significant. The maximum normal strain is up to 6.8%during the normal stress in 400kPa. In pouring form of interface, the contact surface damage occurs in the internal of siltstone for penetrating grout strengthened soil. In compacting type of interface, the parameters of friction were equivalent to the internal friction angle of siltstone. The cohesion could be ignored at the interface.

       

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