汶川地震中沙牌拱坝震情验证研究

本文针对汶川地震中沙牌拱坝的抗震表现,从推求坝址地震复原波、测定坝体混凝土材料实际强度两个方面力求使地震反应分析中的计算条件接近汶川地震中沙牌拱坝的实际情况,并在计算分析中通过调整拱坝接缝的初始强度取值,比对沙牌拱坝在汶川地震震后调查所体现的震损情况以推断震时实际的缝面强度。计算分析与实际抗震表现均验证了沙牌拱坝-地基体系具有较高的实际抗震能力,依据沙牌拱坝抗震表现分析了高拱坝体系较高抗震潜能的主要来源,说明遵照我国抗震规范精心设计施工的高拱坝—地基体系具有较大的抗震潜能。

Verification of the seismic performance of Shapai Arch Dam during Wenchuan Earthquake

The study focuses on the seismic performance of Shapai Arch Dam during Wenchuan Earthquake. We try to make the calculation conditions close to the actual situation of Wenchuan earthquake for Shapai Arch Dam by two ways: one is ascertaining the real earthquake wave at the site of Shapai Dam; the other is to determine the actual strength of the dam concrete through material test on large dynamic universal testing machine. The study inquiries into the real strength of the joints in the arch dam by comparing the calculating results of the joints opening to the actual opening of the joints during the earthquake. Calculation analysis and actual seismic performance has verified that Shapai arch dam-foundation system has a rather satisfying seismic capacity. Through the analysis of the main source of the potential seismic capacity for high arch dam system, the study indicates that high arch dam foundation system designed and constructed according to Chinese seismic code for hydraulic structures has a large potential seismic capacity.