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在黑河工程大坝施工过程中 ,为解决土石坝截流后心墙基础处理工期长的矛盾 ,采用了截流前穿过开挖层帷幕灌浆 ,截流后爆破开挖 ,然后对爆破影响深度复灌的“先灌后挖”方案 ,得出已灌浆饱和黑云母石英片岩爆破孔底以下质点振速分布规律 ,并提出水泥灌浆帷幕破坏的质点振速标准值
In the process of dam construction in Heihe, in order to solve the contradiction of long treatment time of core wall after earth-rock dam closure, curtain grouting through cut-off layer before cutoff and excavation after cut-off were adopted, and then the effect of deep reperfusion on blasting According to the scheme of “digging before digging”, the distribution law of the velocity of particles below the bottom of blasting hole of saturated biotite quartz schist was obtained, and the standard value of vibration velocity of the particle of cement grouting curtain was proposed