关键词: 地下洞室, 水封石油洞库, 顶拱层, 爆破试验, 爆破振动速度, 爆破单段药量

Abstract: Safety control of blasting construction is a crucial problem in the excavation of large underground oil (gas) storage cavern. With the excavation of vault layer of Zhanjiang underground water-sealed cavern as engineering background, we evaluated the safety of surrounding rock of cavern under the impact of blasting load based on monitored data of surrounding rock vibration and damage obtained from field blasting tests. Test results showed that the linear density of the charge of smooth blasting holes as well as the drilling and blasting parameters in the test are generally reasonable as no obvious burst cracks were found in the hole wall after blasting, half-hole ratio conforming well to technical requirements, blasting vibration velocity smaller than safety control standard, and blasting influence depth well controlled. Interlacing blasting excavation of chamber is beneficial to controlling the influence of blasting vibration of the main cavern excavation on adjacent caverns. The maximum charge weight of single delay should be within 34 kg to better control the blasting vibration. The research results offer reference for the blasting design and construction of large-scale underground water-sealed caverns.

Key words: underground cavern, water-sealed underground oil storage, vault layer, blasting test, blasting vibration velocity, charge weight of single delay