Study On Dynamic Mechanical Effect Of Rock Under Chemical Corrosion

Along with the development of deep underground engineering and high-speed railway,the research of Deep rock mass mechanics have been closely watched. multi-field couplingcomplex underground environment is the key factor which influence the stability ofsurrounding rock of roadway of the deep underground engineering, such as high temperature,seepage flow, chemical corrosion, percussive pressure of surroundings and so on. They allhave big influence on the performance and the stability of surrounding rock of roadway of thedeep underground engineering and the influences is intercoupling. Based on theabove-mentioned practical situation of deep underground engineering, the paper researchesthe influence of chemical corrosion on the dynamic mechanical property, which undergroundengineering. Firstly, we got the rock specimen and burnish them into the Laboratory specimen.rock specimen are respectively tufaceous limestone, Pink limestone and pulverous sandstone.We make them as cylinders by burnishing them. Secondly, based on the chemicalcomposition of Deep groundwater, we Prepare the solutions with different pH value anddensity and keep the rock-soils soaked in the solutions. which are respectively conserved inthe atmosphere of high temperature and low temperature. To research the time effect and thetemperature effect, The conservational times are respectively90days and150days. Thirdly, Itake the shock test on the SHPB, deal with experiment data by the method of the Two-wavemethod, get Time-stress curve, time deformation curve and the stress-strain curve. Throughanalyzing the stress-strain curve of the rock-soils in different conditions, the paper arrive atthe following review:(1) The dynamic compressive strength of the rock-soils decreases as the acidity of thesolution increases.(2) The dynamic compressive strength of the rock-soils increases as the strain rate of therock-soils increases.(3) The dynamic compressive strength of the rock-soils increases as the conservationaltemperature and the time increases.(4) After the conservation, the dynamic compressive strength of the damaged rock-soilsless than that of the undamaged rock-soils.Based on the previous constitutive model about the Dynamic destruction of the rock-soilsand the data of the experiment, the paper fit the constitutive equations about the rock-soilsused under the corrosion. But owing to the short time, small deformation of Dynamicdestruction and the homogeneity of the rock-soils materials, the randomicity of compositionprofiles, the dispersion degree experimental result is high and it is difficult to make analysis of regression.