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近来国内外在具有软弱夹层基岩上修建混凝土重力坝的数量日益增多。核算大坝的抗滑稳定安全度是重力坝设计中的首要问题。目前在设计中常用等稳定法(或称等安全系数法)、剩余推力法和被动抗力法校核具有软弱夹层基岩上混凝土重力坝的抗滑稳定。本文根据大坝抗滑稳定超载模型试验,分析了具有软弱夹层基岩上混凝土重力坝滑动和失稳的机理,提出了建议的刚体平衡法。此法既留有余地又不过于保守,并且不仅可以计算设计条件下的抗滑稳定安全系数,而且可以计算出初始滑动时的超载系数和最终失稳时的超载系数,这是其他方法所不能达到的。
Recently, the number of concrete gravity dam built on bedrock with weak intercalated layers has been increasing. Calculating the stability of anti-sliding dam is the most important issue in the design of gravity dam. At present, such methods as equal stability method (or equivalent safety factor method), residual thrust method and passive resistance method are commonly used in the design to check the anti-skid stability of concrete gravity dam on soft bedrock. In this paper, according to the stability test of the dam against sliding, this paper analyzes the mechanism of sliding and instability of the concrete gravity dam with weak interlayer bedrock, and puts forward the proposed rigid body balance method. This method not only leaves room for not too conservative, and can not only calculate the safety factor of anti-slide stability under design conditions, but also calculate the overload coefficient at the initial slip and the overload factor at the final failure, which is not possible by other methods Reached.