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在重力坝沿地基软弱夹层折面的抗滑稳定计算中,系将图2a所示的岩块ADB视作一个整体的刚体去进行的。这样就遇到了岩块下部滑动面AD和DB上的应力分布状态问题,以及稳定问题。现有的计算方法,对这两个问题均未作出准确的回答。为了弥补这一缺陷,将引用前人提出的用“瞬时中心法”计算坝基折面的应力状态的基本概念,并对其加以论证和扩大,同时提出在坝连同岩块ADB失去稳定性之初的一瞬间,系绕其受力变形后的瞬时中心“O”而转动的概念,来回答稳定问题。
In the calculation of the anti-sliding stability of the weak foundation folded along the foundation of the gravity dam, the rock mass ADB as shown in Fig. 2a is treated as a whole rigid body. In this way, the problem of the stress distribution on the sliding surfaces AD and DB at the lower part of the rock and the stability problem are encountered. The existing calculation methods do not give an accurate answer to both of these questions. In order to make up for this defect, the basic concepts of the stress state of the dam foundation fold calculated by the predecessors will be quoted and expanded. At the same time, it is proposed that when the dam and the rock mass ADB lose their stability For a moment, the concept of rotation around its instantaneous center “O” after deformation and deformation, to answer the question of stability.