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利用自行研制开发的剪切蠕变细观试验装置与软弱煤岩细观力学特性测控软件,对边坡潜在滑移面关键区红砂岩进行系统剪切蠕变试验研究,分析红砂岩在不同载荷水平的剪切蠕变作用下细观裂纹扩展的时空演化规律及破坏后破裂面形态特征与剪切蠕变强度之间的关系,初步探讨边坡的滑移机制。结果表明:剪切蠕变作用下,红砂岩宏观蠕变变形与细观裂隙扩展同步进行;红砂岩裂纹扩展方向与剪切应力方向具有一定偏差,且出现多次分岔;裂纹多为绕晶体边缘扩展,扩展路径的不规则性受到岩体晶体分布特征的影响;岩体不同成分之间的应力响应差异、变形不协调和微裂隙之间的相互作用促进了裂隙的萌生和扩展,裂隙多在张拉和剪切共同作用下形成;破裂面粗糙度与剪切蠕变强度呈非线性递增关系,曲率呈先增大后减小趋势。
Using the shear creep mesoscopic test device developed by ourselves and the meso-mechanical characteristics measurement and control software of weak coal and rock, systematic shear creep tests are conducted on the red sandstone in the key sliding surface of the potential slip surface. The effects of different load The relationship between the spatiotemporal evolvement of mesoscale crack growth and the morphological characteristics of rupture surface and the shear creep strength under horizontal shear creep, and the slip mechanism of the slope are discussed preliminarily. The results show that the macroscopic creep deformation of red sandstone coincides with the propagation of meso-cracks under the action of shear creep. The propagation direction of red sandstone cracks has some deviation from the direction of shear stress and appears multiple bifurcations. The irregularity of edge extension and extension path is affected by the distribution characteristics of rock mass. The difference of stress response, the deformation uncoordination and the interaction between micro-cracks promote the initiation and propagation of cracks, Formed under the joint action of tension and shear. The roughness and shear creep strength of the rupture surface presented a non-linear increasing relationship, and the curvature increased firstly and then decreased.