工程截流裹头设计及防护

Design and Protection of Closure Wraps

拉哇水电站工程截流采用单戗宽戗堤从左向右单向进占立堵截流,截流戗堤宽度为40 m,龙口布置于右岸,右岸戗堤堤头稳定与否,直接关系到工程截流的成败。针对电站河床深厚软弱覆盖层、地层抗冲能力弱的特点,裹头采用大块石、特大块石、钢筋石笼联组结构防护措施,取得了良好的效果。本文主要对工程截流前右岸戗堤裹头设计及防护进行简述,供类似工程参考。

River closure in Lawa Hydropower Station is realized through vertical occupation of single wide embankment and blocking from left to right bank.The closure embankment is 40m in width and the closure gap is arranged on the right bank,so the stability of the embankment head on the right bank is directly related to the successful closure of the project.In view of the characteristics of deep and weak overburden in the riverbed and the low anti-scour capacity of the stratum,large boulders,extra-large boulders together with reinforced gabions are used for protection of the head wraps,and good results have been achieved.This paper briefs the design and protection of the closure wraps on the right bank of the river before closure,and the experience accumulated can be referenced by similar projects.