珊瑚礁灰岩水下钻孔爆破破裂特征试验研究  

Experimental Study on Fracture Characteristics of Underwater Drilling and Blasting of Coral Reef Limestone

作　　者：钟冬望[1,2] 熊伟 孟庆山[3] 司剑峰[1,2] 伍岳[1,2] ZHONG Dong-wang;XIONG Wei;MENG Qing-shan;SI Jian-feng;WU Yue(College of Science,Wuhan University of Science and Technology,Wuhan 430065,China;Hubei Province Research Center of Intelligent Blasting Engineering Technology,Wuhan University of Science and Technology,Wuhan 430065,China;Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China)

机构地区：[1]武汉科技大学理学院,武汉430065 [2]武汉科技大学湖北省智能爆破工程技术研究中心,武汉430065 [3]中科院武汉岩土力学研究所,武汉430071

出　　处：《爆破》2021年第2期24-31,共8页Blasting

基　　金：国家自然科学基金项目(51574184、41877267);中国科学院战略性先导科技专项(A类)(XDA13010200)。

摘　　要：在海洋的开发建设过程中,往往涉及到水下珊瑚礁岩的爆破开挖。为研究珊瑚礁灰岩水下钻孔爆破的破裂特征,选用4种类型的珊瑚礁灰岩模拟了3种水深情况下的单孔爆破试验,分析了不同水深条件下礁灰岩试样炮孔附近的破坏、径向裂纹和块度分布。结果表明:礁灰岩炮孔周围破坏情况与岩石强度有关,珊瑚灰岩和珊瑚砾块灰岩试样炮孔周围观察不到明显的破坏现象,生物砂砾块灰岩炮孔周围表面能观察到明显的崩落;爆破后试件表观裂纹的数量和宽度会随着水压的增加而减少;天然裂隙的存在会导致爆炸应力波的传播路径和作用方式发生改变从而阻断裂隙的扩展;水下珊瑚砾屑灰岩爆破的大块率会随着水深的增加而增加,且块度分布符合swebrec分布函数。In the process of ocean development,blasting excavation of underwater coral reef limestone is often involved.In order to study the fracture characteristics of coral reef limestone after underwater drilling and blasting,four types of coral reef limestone were used to simulate single hole blasting tests under three water depth conditions.The failure zone around the hole,radial crack and fragmentation distribution of reef limestone specimens under different water depth were analyzed.The results show that no obvious failure zone around the hole is observed in coral limestone and coral gravel limestone specimens.For the biological gravel limestone,obvious cavity can be observed on the surface around the blast hole.The number and width of apparent cracks of the specimen after blasting decreases with the increase of the water pressure.The boulder yield increases with the increase of water depth,and the block size distribution of underwater drilling and blasting of coral reef limestone conforms to the swebrec distribution.

关 键 词：水下钻孔爆破 珊瑚礁灰岩 外观分析 径向裂纹 块度分布 Swebrec分布函数 

分 类 号：TV135.6[水利工程—水力学及河流动力学]