溢洪道开挖爆破块度级配控制研究STUDY ON CONTROL OF FRAGMENTATION GRADATION IN EXCAVATION OF A SPILLWAY BY BLASTING
李保林,刘治峰,郭永为,张永哲
LI Bao-lin~1; LIU Zhi-feng~1; GUO Yong-wei~1; ZHANG Yong-zhe~2 (1.Hydraulic Engineering Bureau of Hebei Province;
摘要(Abstract)：
采用深孔梯段爆破进行溢洪道扩挖时 ,根据岩体的力学特性和工程要求 ,制定合理的爆破方案 ,正确选择爆破参数 ,并采取一系列技术措施控制其特征尺寸 ,使爆破石碴具有一定的块度级配。用YS— 1型压实计检测和灌水法抽验的结果表明 ,碾压 4～ 6遍后的石碴干容重大于 2 0kN/m3,达到较高的填筑密实度 ,完全满足工程要求。
On the basis of rockmass characteristics and engineering demands,through working out reasonable blasting plan,selecting correct blasting parameters and using a series of technological measures for control of fragmented rock's characteristic size,the fragmentation gradation can be controlled in excavation of a spillway by deep-hole bench blasting.The results of detection by YS-1 compactness meter and sampling inspection by water-poring method shows that the fragmented rock rolled at 4～6 times has a high compactedness and a dry density of larger than 20 kN/m~3,meeting the demands for dam construction.
关键词(KeyWords)：
深孔梯段爆破;块度级配;大块率;干容重
Deep-hole bench blasting;Fragmentation gradation;Boulder yield;Dry density
基金项目(Foundation):
作者(Authors):
李保林,刘治峰,郭永为,张永哲
LI Bao-lin~1; LIU Zhi-feng~1; GUO Yong-wei~1; ZHANG Yong-zhe~2 (1.Hydraulic Engineering Bureau of Hebei Province;