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敷设在下游坝面的高水头大直径钢衬钢筋混凝土压力管道是近年来发展起来的一种新型管道布置方式及结构型式。笔者通过对李家峡水电站下游坝面压力管道的原型仿真材料结构模型试验,研究了在内水压力作用下压力管道的钢衬、钢筋、混凝土的应力状态及混凝土的弹性变形,以及管道的开裂特征和破坏机理。研究成果表明,压力管道在开裂前,钢材处于低应力状态,混凝土承担大部分内水压力;压力管的钢材、钢筋、混凝土能够可靠协调地联合作用;作为下游坝面压力管道的设计,不一定强求初裂荷载大于设计工作荷载,否则会增加材料用量;混凝土微裂纹对开裂的影响及微观机理,尚须进一步研究。
The high head and large diameter steel lined reinforced concrete pressure pipe laid on the downstream dam surface is a new type of pipe layout and structure developed in recent years. Based on the prototype simulation of the pressure pipelines in the downstream of Lijiaxia hydropower station, the author has studied the stress state of the steel linings, steel bars and concrete and the elastic deformation of the concrete under the pressure of the internal water pressure and the cracking characteristics of the pipelines. Damage mechanism. The research results show that before cracking, the steel is in a low stress state and the concrete takes most of the internal water pressure. The steel pipe, the steel bar and the concrete in the pressure pipe can work together reliably and harmoniously. As the design of the pressure pipe in the downstream dam, it is not necessarily Forcing the initial load is greater than the design load, otherwise it will increase the amount of material; Concrete microcracks on the cracking and micro-mechanism, still need further study.