长沙坝水库除险加固关键技术

Key technologies of danger removal and reinforcement of Changshaba Reservoir

长沙坝水库大坝为浆砌石拱坝,经过30多年运行,存在诸多安全问题,需进行除险加固。经过对主要技术问题的计算分析,采取锚固、加厚坝体、灌浆等针对性加固措施后,大坝坝体应力满足规范要求。左右岸不对称变形、右坝肩绕坝渗漏问题已得到较好的控制,消力池及左岸危岩体对大坝安全的威胁也已消除。工程恢复蓄水后,经过近4 a的观测,水库各项监测指标正常,除险加固效果明显,工程安全可靠。

After 30-years operation,the problems of Changshaba Reservoir are threatening its normal operation and benefit realization.Through analysis and calculation,the reinforcement measures are adopted accordingly including anchoring,thickening the dam body and grouting.Therefore,the stress of dam body can meet the requirement of the standard;the asymmetric deformation of left and right banks and the seepage around the right dam abutment are controlled;the problems such as the dangerous rock mass at the left bank and stilling pool are eliminated.Through 4-year monitoring after re-impoundment of the reservoir,the relative indexes are normal and the effects of danger removal and reinforcement are obvious.The danger removal and reinforcement of this masonry arch dam can be referenced to the similar projects since the lack of experience in this field.