高拱坝坝基断层加固力研究

高拱坝坝基断层的处理是拱坝建基面设计中重要的一环,该处应力复杂,确定置换体、锚固体所应承受加固力比较困难。本文运用变形加固理论对高拱坝坝基断层的加固机理进行研究。变形加固理论揭示了自承力、加固力、外荷载、结构稳定性和变形之间内在的联系,指出在给定外荷载作用下,结构的加固区域就是出现不平衡力的区域,为抑制破坏所需加固力即为不平衡力的反向力。研究结果表明:坝基断层为不平衡力集中区,断层的不平衡力与断层受力相比为小量,但它关系到断层的稳定性;不平衡力的大小、方向和分布有助于确定断层的加固区域及制定合理的加固方案。

Research on reinforcement forces for faults of foundation of high arch dams

The reasonable treatment for faults of dam foundation is important in design of monolithic stability of arch dams.The stress in dam foundation is complicated and it is difficult to determine reinforcement force supported by replacement bodies or anchorage bodies.In this paper,deformation reinforcement theory is used to analyze the faults reinforcement of dam foundation.By applying this theory,the relationship among self-bearing force,reinforcement force,loads,stability and deformation of structure can be revealed.Under the action of a given load,the area where unbalanced forces exist is the location of initial failure occurred.The reinforcement force to restrain the failure is just the opposite direction of the unbalanced force.It may be concluded that faults of dam foundation is the concentrated area of unbalanced force,by contrast with supported force of faults,the unbalanced force is small but has an important role for monolithic stability of faults.So that the analysis on the magnitude and the distribution of unbalanced force of faults is useful to determine the reinforcement area and reasonable reinforcement scheme.