一、前言浙江青田石郭一级坝,坝高51米,坝顶长110米,是我国最早采用定向爆破技术堆筑的大坝之一。1959年11月爆破成功后,随即进行坝面整理,反滤料和粘土斜墙的填筑,1960年汛期蓄水。其枢纽布置见图1。由于爆破设计对岸坡渗漏影响估计不足,和地形的限制,爆破药室仅比坝顶高12～1米,采用的爆破指数偏大,装药量折合标准炸药为299.2吨。加以坝区地质条件复杂,构造 I. INTRODUCTION Zhejiang Qingtian Shiguo first-class dam with a height of 51 meters and a crest of 110 meters is one of the earliest dams to be built by directional blasting in China. After the successful blasting in November 1959, dam consolidation, filter materials and clay sloping walls were completed, and the 1960 flood storage. The hub layout shown in Figure 1. Due to the underestimated impact of blasting design on the slope on the slope and terrain, the blasting medicine room is only 12 to 1 meter higher than the crest. The blasting index used is too large, and the charge is equivalent to 299.2 tons of standard explosives. Geological conditions to dam complex, structure