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通过对人工劈裂的节理试件进行水泥灌浆加固处理,并进行一系列室内压剪试验,总结了灌浆节理面压剪全过程剪应力-剪切位移的典型曲线形式,分析了充填度和法向应力对灌浆节理的变形、强度特点的影响规律,总结了由充填度决定的灌浆节理两种压剪破坏形式,揭示了其破坏机制.研究结果表明,低法向应力下灌浆节理面表现出脆性破坏特点,峰值剪切强度大于无灌浆节理面的,而在高法向应力条件下,灌浆节理面有一定的延性,峰值剪切强度小于紧密闭合且吻合系数较高的无灌浆节理面的;当充填度大于1.0时,各个充填度的灌浆节理面剪切强度差异较小.研究成果加深了对灌浆节理压剪破坏特性的认识,并具有一定的工程指导意义.
By means of cement grouting reinforcement of artificial splitting joint specimens and a series of indoor compression shear tests, the typical curve forms of shear stress-shear displacements during the whole compression-shear process of grouted joints are summarized. The influence of stress on the deformation and strength characteristics of grouting joints was summarized, and the two forms of pressure-shear failure of grouting joints, which were determined by filling degree, were summarized and the failure mechanism was revealed. The results show that the grouting joint surface under low normal stress Brittle failure characteristics, the peak shear strength is greater than the non-grouted joints, and under high normal stress conditions, the grouting joints have a certain ductility, the peak shear strength is less than the tight closure and high coincidence coefficient without grouting joints When the filling degree is greater than 1.0, the difference of the shear strength of the grouting joints at each filling degree is small.The research results deepen the understanding of the characteristics of the compressing and shearing failure of the grouting joints and have certain engineering guiding significance.