大坝岸坡震后抗震加固技术措施研究

Study on Technical Measures for Seismic Reinforcement of Dam Bank Slope after Earthquake

某大坝砌石护坡结构在一次地震中受到严重损坏,震后对其进行抗震加固是保证大坝正常运行的重要一步。为了观测地震过程中浆砌石护坡结构与干砌石护坡结构的实际震动反应状态,研究这两种护坡结构对堆石坝坡的防护加固效果和机制,通过设计模型震动试验,采用不同振动幅度、不同震动次数来开展试验,分析两者的震动规律,对比分析两种护坡结构的效果。结果表明,浆砌石护坡对堆石坝可以起到较好抗震加固效果,其约束效果比干砌石护坡结构的约束效果强;随着震动次数的增加,浆石护坡结构能够较好削弱持续震动带给坝坡的损害,而砌石护坡结构的这种效果较差;对于大坝坝坡和坝身表面砌石护坡抗震最薄弱处(大于3/4坝高的部位),可以选择浆砌石护坡代替干砌石护坡的形式。

The stone masonry slope protection structure of a dam was seriously damaged in an earthquake.The seismic reinforcement of it after the earthquake is an important step to ensure the normal operation of the dam.In order to observe the actual vibration response state of the masonry slope protection structure and the dry masonry slope protection structure during the earthquake,and study the protection and reinforcement effect and mechanism of the two slope protection structures on the rockfill dam slope,through the design of model vibration test,the test is carried out with different vibration amplitude and different vibration times,the vibration law of the two is analyzed,and the effect of the two slope protection structures is compared and analyzed.The results show that the masonry slope protection has a good seismic reinforcement effect on the rockfill dam,and its restraint effect is stronger than that of the dry masonry slope protection structure;with the increase of vibration times,the masonry slope protection structure can well weaken the damage caused by continuous vibration to the dam slope,while the masonry slope protection structure has a poor effect;for the weakest anti-seismic part of the dam slope and the stone masonry slope protection on the dam body surface(the part greater than 3/4 of the dam height),the mortar masonry slope protection can be selected to replace the dry masonry slope protection.