带裂缝重力坝并缝效果研究

Research on the effects of joints conjunction of concrete gravity dams with joints

运用有限元混合法，研究了带缝重力坝的应力和变形性态．详细讨论了带缝重力坝的并缝问题，发现并缝对改善带缝坝体的受力状态效果明显。特别是自缝顶沿缝深度实施多点并缝，其水平位移基本接近于整体呗．并缝后坝体的控制应力由缝底转移到缝顶，控制应力特别是拉应力明显减小．但并缝导致缝顶应力集中，需要在缝顶周围采用高强混凝土。同时并缝的作用是有限的，它只能作为带缝坝补救措施，而不能取代灌浆。

This paper studies the stress and deformation behavior of the concrete gravity dam with joints by means of mixed approach using finite element methods. The problem of joints conjunction of the concrete gravity dam with joints has been discussed in great details. The calculation results clearly show that the conjunction of joints improves the stress condition to a greater degree, and especially the engineering measures implementing the multiple joints conjunctions from the joint top along the joints depths makes the horizontal deformation of a dam close to that of a monolithic structure. After joints conjunction, the position of control stress changes form the bottom of the joints to the top, and the control stress, especially tensile stress, decreases obviously. However, joints conjunction causes stress concentration, and high strength concrete should be used around the top parts of joints simultaneously, the effectiveness of joints conjunction is limited, so joints conjunction is only a compensation measure for concrete gravity dam with joints and can't substitute grouting.