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充填节理的破坏主要有充填物破坏和充填物与节理接触面破坏两种形式,其抗剪强度与最小抗剪部分的强度相同.当充填物破坏时,单独对充填物部分进行受力分析,得到此时的节理抗剪强度公式.讨论了充填节理强度随法向压应力及充填厚度的变化规律:随着法向压应力的增加先增大后减小,但随充填厚度的变化并不十分明显.对不同厚度的砂浆充填节理进行直剪试验.结果表明:其剪切强度与破坏模式有关;在同一破坏模式下,不同充填厚度的节理其剪切强度变化不大.
The failure of filling joints is mainly caused by the failure of filling and the failure of the interface between the filling and the joint, and the shear strength is the same as that of the minimum shear strength.When the filling is damaged, The formula of the joint shear strength at this time is obtained.The variation regularity of filling joint strength with the normal compressive stress and the filling thickness is discussed: firstly increases and then decreases with the increase of the normal compressive stress, but does not change with the filling thickness The results show that the shear strength of the mortar joints is related to the failure mode, and the shear strength of the joints with different filling thickness does not change much under the same failure mode.