中文摘要：

总结了钢衬钢筋混凝土坝后背管管坝接缝面的构造方式，分析了接缝面的破坏机理，指出地震作用组合工况下接缝面主要有沿缝面的剪切破坏模式和垂直缝面的受拉破坏模式。针对这两种破坏模式，建立了基于接缝面应力状态的极限状态设计表达式，用于对接缝面做结构设计和安全评价。算例分析表明，高烈度地震作用使接缝面呈现较大的拉剪应力状态，采用台阶形键槽并配置适量锚筋可使接缝面满足安全要求，管道与坝体能可靠地联合承载。

英文摘要：

The construction mode at the joint between steel lined reinforced concrete penstock on downstream surface of dam is summarized; and the failure mechanisms of the joint are analyzed. Two types of failure modes, shear failure along joint and tension failure perpendicular to joint, are indicated to be the main failure modes under high-intensity earthquake. Based on limit state method,expressions corresponding to the failure modes are established, which can be used to evaluate joint safety. An example is given for interpreting usage of the expressions, which shows that there exists an unfavorable combination stress state in the joint under high-intensity earthquake; and the joint can be safety when employing stepped keyslot and proper quantities of anchor bar.