设缝高拱坝的破坏机理研究

对设周边缝，底缝高拱坝的破坏机理进行了阐述，采用增大水重度和降低坝基交界面或缝面材料强度储备两种方法；对未设缝高拱坝，设部分周边缝高拱坝和底缝高拱坝的破坏形式。破坏过程进行研究，寻找设缝拱坝的可能破坏形式和破坏机理，研究结果表明，三种坝型的整体安全度由大到小的顺序为未设缝拱坝，部分周边缝拱坝和底缝拱坝，破坏均是从坝体与垫座交界面上游侧开始开裂，向下游扩展，最终下游侧屈服破坏。

Failure mechanism of high arch dam with joints

Failure mechanism of a high arch dam with joints is presented. In order to seek the possible failure modes and its mechanism of an arch dam with joints, two methods, which one is overload method by increasing water gravity density, the other is reducing strength storage of material along the interface of dam foundation or joints, are used to study the failure modes and failure processes for the high arch dam without joints,with partial perimetrical joints and with base joints respectively. Degree of safety and failure modes for the abovementioned three types of dams are analyzed. The results demonstrate that in order of degree of safety the arch dam without joints ranges first ,then, the dam with perimetrical joints, and the dam with base joints last. Cracking failure first occurs at the upstream side of interface between the dam body and the cushion,then expands to the downstream and yielding failure occurs at the downstream face at last.