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中文摘要：
研究岩体的临界破碎损伤阈值对于划分岩体的破碎状态和确定爆破岩体可开挖范围有重要意义。根据爆破作用过程和岩体破碎机制,分析钻爆条件下岩体的破碎状态,提出保留岩体与可开挖岩体的分界面处于一种临界破碎状态。基于岩体的声波特性和损伤理论,利用岩体损伤变量来表征岩体的破碎程度,并将岩体损伤分为初始损伤和爆破损伤。依托白鹤滩水电站工程项目,在坝肩爆破开挖区进行大量的声波测试试验,分析不同深度岩体的损伤状态,试验结果表明,爆后岩体临界破碎损伤变量在0.8左右。搜集国内外有关项目的声波实测数据,统计临界破碎状态岩体的损伤变量,并最终确定其损伤阈值为0.75~0.85。
英文摘要：
It is important to investigate the damage threshold of critical broken rock mass for the classification of different broken states and the scope of excavated zone in rock blasting. The broken states of the remaining rock mass under blasting loading were analyzed through the study of fragmentation process and the mechanism of rock mass breakage. The idea that the interface between the remaining rock mass and the excavated rock mass is in a critical broken state was put forward. According to the rock damage theory, the damage variable combined with the acoustic velocity in rock was used to indicate the broken states of rock mass. Rock damage was divided into the initial damage and the blast induced damage. Rock broken states were Validated with a large quantity of acoustic tests in the blasting excavation zone at Baihetan power station, and the results showed that the damage variable of critical broken rock mass was about 0.8. Finally, some more engineering experiments were collected to ascertain that the statistic damage threshold was in the range of 0.75 - 0.85.
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