丰满大坝溢流面裂缝和渗水及冻融与冻胀对坝体结构安全影响分析

Safety Analysis on the Spillway Cracking & Water Penetrating and Freeze-thaw & Frost Heave Effecting the Dam Structure in Fengman Hydraulic Power Station

丰满大坝由于施工质量差，混凝土强度低，在1986年泄洪时12～14号坝段溢流面被冲毁。分析认为冲毁主要原因是混凝土冻胀破坏引起的，为此对大坝进行了全面补强加固。加固后不久溢流面出现裂缝，1997年发现溢流面渗水，2006年和2007年针对溢流面存在的问题，进行了坝体灌浆防渗技术研究和溢流面化学灌浆处理。根据大坝溢流面加固前后的混凝土质量对比，对坝体结构的安全进行分析。

Because of poor construction quality and low strength of concrete, 12 to 14 dam sections were damaged during the flood discharge in 1986. Analysis shows that this is caused by frost heave of the concrete. As a result, an overall reinforcement of the dam is put into action. Soon after that, cracks appears on the spillway, and penetrating occurs in 1997. In 2006 and 2007, studies are made on grouting and penetration-proof technology and chemical grouting processing are carried out upon on the spillway against the exiting problems of the spillway. Safety analysis on the dam body is made by comparison between the concrete quality before and after the reinforcement.