Dagangshan large hydropower spandrel slot height, steep upper slope, gradually slows down the entire slope complex genlogic, al conditions, fractured joints, mainly in Ⅲ、Ⅳ class rock rock, local rock for the Class Ⅱ rock, the overall slope stability is good, but because of dykes, faults and fracture zones cutting joined, and locally cover the rock quality is poor, there is partial spandrel groove slope instability. Construction blasting parmneters through optimization methods to reduce damage to the arch of the shoulder slot.%大岗山水电站拱肩槽高差大、坡度上部较陡，往下逐渐变缓，整个坡面地质条件复杂，节理裂隙发育，主要以Ⅲ、Ⅳ类岩体岩体，局部为Ⅱ类岩体岩体，边坡的整体稳定性好，但由于岩脉、断层破碎带和节理裂隙切割，且局部有覆盖层。岩体质量较差，拱肩槽边坡存在局部不稳定问题。施工中要通过优化爆破参数等方法降低对拱肩槽的破坏。
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