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通过对门楼水库溢流坝段不同位置、不同深度、不同岩石风化程度在不同混凝土强度和不同含水率情况下近百块试块的室内直剪试验,研究了岩石和混凝土胶结面的抗剪强度与混凝土强度、岩石的风化破碎程度和含水率的关系。结果表明,混凝土的强度对胶结面的抗剪强度具有明显的影响;对于块状及次块状结构类型岩体,胶结面抗剪强度参数基本相同,但裂隙块体强度降低很多,部分块体破坏形态已不在是沿胶结面破坏,而是部分迁就胶合面,部分追随岩体内的结构面,并形成较大的起伏;随着含水率的增加,凝聚力和内摩擦角都明显降低。试块的抗剪强度只代表试验点的强度,为了得到建基面的抗剪强度,将岩石和混凝土的抗剪强度看作随机变量,引入区域化内变量和变异函数反映抗剪强度的随机性和结构性,通过克里格方程求得各个样本的权值,进而求出不同建基面的抗剪参数。
Through the indoor direct shear test of almost 100 blocks with different locations, different depths and weathering degrees of overflow spillway in Miaolu reservoir, the shear strength of the cemented surface of rock and concrete is studied. Relationship with concrete strength, degree of weathering and crushing of rock and water content. The results show that the strength of concrete has a significant effect on the shear strength of the cemented surface. The shear strength parameters of the cemented surface are the same for the massive and sub-massive rock masses, but the strength of the fractured block is greatly reduced. Damage morphology is no longer along the cement surface damage, but part of the migration to the glued surface, part of the body to follow the rock surface structure, and the formation of large ups and downs; with the increase of water content, cohesion and internal friction angle are significantly reduced. The shear strength of the test block represents only the strength of the test point. In order to obtain the shear strength of the foundation, the shear strength of the rock and concrete are regarded as random variables. The internal variables and the variation function are introduced to reflect the shear strength randomly Sexual and structural, through the kriging equation to obtain the weight of each sample, and then find the shear parameters of different building surface.