Research On The Matching Relations Of Bench Blasting Ectopic-hole Offset And Periphery-hole Loading Amount

In the process of blasting work in open pit, as the blasting working face is complex, which leads that the blasting work is not regular and the subsequent blasting working effect is undesirable. It is common condition in the process of blasting work in open pit, and it seriously influents the production efficiency and the economic benefit. So it is necessary to intensive study the ectopic holes blasting.To the common phenomenon of ectopic holes blasting in the process of blasting work in open pit, it provides the concept of the ectopic holes, analyzes the reason of the appearance of the ectopic holes, and intensive study the ectopic holes blasting in open pit with the methods of theoretical analysis, numerical simulation and mathematic fitting. According to the rock-cracking mechanism and dynamic failure theory analyze the effective stress distribution state of the blasting stress field in the rock after blasting. Simulate the five holes with the finite element software of ANSYS/LS-DYNA, and get the effective stress distribution state of the blasting stress field and the tensile strength of the rock most difficult breaking point which is 22.5Mpa of each hole. Based on the design holes model, simulates the effective stress distribution state of the middle holes who shifts 0°?22.5°?45°and 20cm?60cm?100cm?140cm?180cm and surrounding holes after blasting. Fit the numerical simulation result with the least square method, and get the matching relation between blasting load of surrounding holes and the ectopic holes who shifts 0°?22.5°?45°nd 20cm to 180cm. It has theoretical and guiding significance to cost control of drilling and blasting production and engineering blasting.