Three Dimensional Geological Model Of Karst Area Established And Its Application In Blasting Design

With the continuous construction and development of society,blasting technology has become the main means of excavation of construction projects,and safety of blasting construction has been paid more and more attention.The geological conditions of the blasting area is an important factor affecting blasting effect and blasting safety,complicated geological conditions in karst region,strengthen the analysis and research of blasting area geological conditions,has important theoretical and practical significance to the safety of blasting construction.Guiyang City Chaoyang Dong Lu town of blasting engineering in the construction process,due to the presence of the cave structure caused by insufficient attention,flyrock accident.Therefore,the geological radar burst geological structure features of karst caves,karst cave area explosion was established 3D geological model structure using 3DMine mining engineering software,using ANSYS simulation analysis of the influence of different Karst Characteristics of rock blasting effect,provide technical support for the optimization design of blasting blasting area,the specific research results are as follows:1,Geological radar detection and identification of karst features.By using the GPR to detect the structure of the known karst caves,the characteristics of the karst caves are identified by means of waveform characteristics analysis,frequency spectrum analysis and time-frequency analysis.2,Establishment of 3D geological model and 3D visualization of blasting design in Karst area.Combined with the geological radar detection results of karst tectonic features and 3D surface model,establish karst virtual borehole database;3DMine mining engineering software based on 3D geological model is established considering the cave,and realize the 3D visualization design of karst structure blasting area.3,The influence of cave structure characteristics on blasting effect and numericalsimulation.Using the methods of theoretical analysis and numerical simulation of free surface condition,double bottoms dosage and packing volume calculation and discussion of the theory,and the influence of karst tectonic characteristics on blasting effect analysis.The results show that the choice of cave depth is more than 5m,the hole diameter is 70 mm,the charging structure for continuous and coupling charge:(1)when the cave structure surface inclination is 0 degrees,hole spacing that are set to4.24m;(2)when the cave structure surface inclination is 45 degrees,along inclined hole spacing suggested cave set to 3.29 m along strike recommended setting is 4.24m;(3)when the cave structure surface inclination is 90 degrees,the minimum resistance line proposal is set to 0.8m.4,Engineering verification.Combined with the engineering example,verified based on geological radar detection and karst structure,3D geological model is established considering the cave,combined with the results of numerical simulation of hole net parameter design,after blasting experiments show that after blasting effect,in order to achieve the safe,economical and efficient by blasting cave structure under the conditions of effect.