长沙坝坝体裂缝及不对称变形原因分析

Analyses of the Reason of Changsha Dam Body Crack and Unsymmetrical Deformation

针对长沙坝坝体开裂、坝体应力及坝肩稳定不满足规范要求、坝体变形不对称等问题,结合除险加固设计,对坝体裂缝及不对称变形原因进行了分析和探讨。提出了原坝顶施工温度偏高、温度荷载及左右坝肩地质条件差异是引起坝体变形不对称的主要原因。在采取坝肩加固、裂缝灌浆、坝体(上游面或下游面)加固等综合处理措施后,坝体应力满足规范要求,坝体不对称变形可得到明显改善。

According to the crack and stress of Changsha dam body, instability of dam abutement and deformation, body crack and unsymmetrical deformation reason are analyzed and discussed, considering removing danger and reinforcement. Higher construction temperature of former dam crest, temperature load and the difference of left-right dam abutement geological conditions are the main causes. Reinforcing dam abutement, dam body (upstream face of downstream face)and grouting crack are recommended. Dam body stress should be met requirements of specification and thus unsymmetrical deformation are improved a lot.