Empirical model of concrete block fragment behavior under explosion loads  

作　　者：YANG Shuai NING JianGuo REN HuiLan XU XiangZhao 

机构地区：[1]State Key Laboratory of Explosion Science and Safety Protection,Beijing Institute of Technology,Beijing 100081,China

出　　处：《Science China(Technological Sciences)》2024年第8期2515-2529,共15页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 12032006 and 12372350)。

摘　　要：Concrete structures undergo integral fragmentation under explosion loads. The fragmentation degree and particle-size distribution of concrete blocks under explosion loads must be considered during mining to ensure safety. In this study, the impulse is calculated based on the relationship between overpressure and time, and the impact energy of the explosion wave is obtained based on blast theory. Subsequently, the Mohr-Coulomb shear strength fracture criterion is introduced to determine the ultimate shear stress of the concrete materials, and an empirical model that can effectively calculate the energy consumption of concrete blocks under explosion loads is established. Furthermore, concrete fragments with different particle sizes under explosion scenarios are quantitatively predicted with the principle of energy conservation. Finally, explosion tests with different top standoff distances are conducted, and the concrete fragments after the explosion tests are recovered, sieved, weighed, and counted to obtain experimental data. The effectiveness of the fragment empirical model is verified by comparing the model calculation results with the experimental data. The proposed model can be used as a reference for civil blasting, protective engineering design, and explosion-damage assessment.

关 键 词：concrete structures explosion loads fragment behavior empirical model 

分 类 号：TU37[建筑科学—结构工程] TU312.1