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一、关于纵向接缝 (一)纵缝功能混凝土重力坝的纵缝属于临时性接缝,其功能首先是防止混凝土坝段在上下游方向的开裂。美国H.C.J.三氏在坝工学中指出:混凝土坝段在上下游方向的收缩,是个较麻烦的问题,而对于混凝土大坝尤其如此。设置纵缝,可防止因混凝土收缩和基岩约束作用而引起的开裂,也便于热量的发散,还可以人为地控制开裂的位置和裂缝延伸的方向,以避免它任意发展。纵向裂缝还有可能与最大剪力面接近或吻合,其危害尤甚。例如我国有一宽缝重力坝,坝段长为16.0米,底宽为54.5米。由于没有设置纵缝,各坝段普遍存在贯穿性的纵向裂缝,每
First, on the longitudinal joints (A) longitudinal seam function Longitudinal joints of concrete gravity dam is a temporary joint, its function is to prevent the concrete dam in the upstream and downstream direction cracking. American H.C.J. Sanji pointed out in the dam engineering: concrete dam contraction in the upstream and downstream directions, is a more troublesome problem, but especially for concrete dams. Set the longitudinal seam, to prevent cracks caused by concrete shrinkage and bedrock constraints, but also facilitate the dissipation of heat, you can also artificially control the location of cracks and crack extension direction to avoid its arbitrary development. Longitudinal cracks may also be close to or coincide with the maximum shear surface, which is particularly harmful. For example, China has a wide-gap gravity dam, dam length of 16.0 meters, the bottom width of 54.5 meters. Because there is no longitudinal seam, there is a common longitudinal cracks in every dam