Research On Vibrating Response Characteristics Of Rockmass Induced By Blasting Excavation In Underground Oil Storage Cavern

Underground fuel depots have some noteworthy characteristics of large span(19m),high sidewall(24m),long axis(934m).The sealing plug(516m3)is one of the key structures to ensure tightness caverns in the entire project.And the underground oil storage caverns supporting engineering is different from that using to support mine tunnels.The basic principle of mine tunnels supporting engineering is to ensure workers safety by supporting incompetent rock in time.And the support structures can be repaired in time even if they were damage.But the underground caverns are different,which often are beyond repair if the supporting body or the surrounding rock damage occurs during production operation.So it is important to control the influence of blasting vibration on surrounding rock and supporting engineering in the process of blasting excavation.It is a good idea to control blasting vibration intensity by smooth blasting and pre-split blasting,which also creates a problem of safety distance in supporting engineering.Taking a underground oil storage cavern as the background,around the theme of blasting vibration control and the response of rock vibration,the regression of blasting vibration velocity,main vibration frequency and vibration acceleration attenuation is conducted by the methods of indoor rock mechanics experiments,blasting vibration monitoring and dates analysis.The response characteristics of underground structure vibration were studied by analyzing the three indexes.Finally,analytic solution and illustration solution of the sealing plug engineering and the safe distance of support engineering are got,which is convenient to use for workers on the site.Around this research,the paper carries out the following research work in three areas:1.The rock mechanical properties of granite,granite aplite and grey greenstone are got by indoor rock mechanics experiments.The reservoir rock mass quality is graded by the Q system through engineering geological survey and geological sketch,which can provide the basis for the choice of supporting parameters.2.Blasting vibration measurement program is designed and conducted,which obtains a total of 49 set of valid data.Those dates are processed and analyzed by using nonlinear curve fitting functions of ORIGIN software.Finally,the regression of blasting vibration velocity,principal frequency and acceleration is analyzed by the linear fitting function of ORIGIN software,which provides the basis for determining the safe distance of concrete project.3.Based on regression analysis,the analytical solution of safety distance of concrete engineering is got and the appropriate graphs are drawn.These works will provide a reliable basis for the corresponding engineering,optimize the construction design and improve the operational efficiency.