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本文首先提出了“较完整基础”的概念,即认为接触面和基岩内部结构都能保证坝体拉应力的传递。在此假定下通过有限元分析计算,研究了基岩的应力状态,并通过试验研究了重力坝的实际极限工作状态,从而认识了由脆性材料组成的“坝——坝基”这个整体的超静定结构的破坏机理。提出了在较完整岩基上,以“极限旋转”破坏模式代替传统的“抗滑稳定”和“无拉应力”破坏模式。最后用该模式复核了某坝段,与原方案进行比较,说明了该方法的合理性。
In this paper, the concept of “more complete foundation” is first proposed, which means that the contact surface and the internal structure of bedrock can ensure the transfer of tensile stress in the dam. Based on this assumption, the stress state of bedrock was studied through finite element analysis and calculation, and the actual working state of limit of gravity dam was studied through experiment. Thus, the whole “ultra-quiet dam-dam foundation” Set the structure of the destruction mechanism. This paper proposes to replace the traditional failure modes of “anti-skid stability” and “non-tensile stress” with the “limit rotation” failure mode on the more intact rock foundation. In the end, a certain dam section is checked with this model and compared with the original scheme, which shows the rationality of this method.