Study On Fracturing Characteristics Of Hydraulic Fracturing And Analysis Of Rupture Effect Of Proportioning Coal

Hydraulic fracturing technology is widely used in many engineering fields and has been effectively developed.In coal mining.Hydraulic fracturing technology by injecting high pressure water into the coal seam and Broken coal,Infiltrated coal,To promote the impact of coal to the depth of the impact of the transfer,To achieve the purpose of effectively mitigate the impact of ground pressure.However,due to the site of hydraulic fracturing technology with non-repeatability,In recent years,scholars will focus on the laboratory,However,the lack of laboratory experiments,reliability and lack of evaluation of the results of this research focus.This paper uses theoretical research,experimental research and numerical simulation analysis method to experimental study on hydraulic fracturing,On the one hand,the hydraulic fracturing experiment is supplemented,On the other hand,the reliability of the experiment is verified by the comparison of theoretical analysis and numerical simulation and exploratory evaluation of the experiment,Mainly including the following:(1)Laboratory hydraulic fracturing experiment through the rational layout of the instrument and the experimental pre-treatment to ensure that the sample can be carried out smoothly,at the same time through the same material with different ratio of different uniaxial compressive strength of the sample,With the increase of uniaxial compressive strength,the fracturing pressure of the specimen is increased.(2)Water pressure detection and sample initiation process during hydraulic fracturing experiment,The relationship between the wall penetration of the specimen at different stages of hydraulic fracturing and the stages of the hydrodynamic change process was obtained,at the same time,the time characteristics of the water pressure rise,initiation and rupture of the samples with different proportions were observed.(3)Through the ANSYS simulation software output data and experimental data at each stage of the calculation results less error,was 1.33%?0.98%?0.87%,So the experimental results can be considered to be more accurate and the experiment did not damage the fracture mechanical properties of the test,Proved the exact letter of the experiment.(4)Data collection and recording through multiple sets of experiments,through the energy method and Fractal dimension to prove that The initiation effect of the same sample was increased with the initiation pressure,the more complete the energy release,the greater the fractal dimension of the fracture surface area,the better the fissure development effect.