Experimental Study Of Using Asphalt And Marine Sand As Soft Rock Equivalent Materials

With the continuation of the mining depth of the underground works,The stress and its mechanical system of deep rock is becoming more andmore complex. the shallow rock mechanics theory is no longer fullyapplicable to the deep rock mechanics, Because traditional simulatedmaterial can not fully reflect the viscoplastic and large deformationcharacteristics of soft rock. and the lag of experimental study methods ofsoft rock. So looking for a new, short-term, efficient and accurate similarsimulation material is inevitable to experimental study of soft rockrheology. Based on my tutor’s two National Natural Science Foundationstudies” Study on the Rheology Softening Theory of Asphalt,Rubber-plastic, and Soft Rock Material and Their SimulationExperimentation”and” Deep soft rock rheology theory and the Study ofPolymeric materials’ similar simulation”, this paper derives the similarrelationship of the modeling materials according to Similar three theorems;Through the analysis of mechanical properties and deformationcharacteristics of asphalt mixture and its comparative analysis with deepsoft rock, it is feasible for Asphalt mixed material to simulate deep softrock in theory. from the uniaxial compression tests of asphalt mixture,measures the density, initial modulus of elasticity, the strain when start toundermine and the compressive strength of different proportions of asphaltand marine sand borrow (asphalt:marine sand borrow are for1:5,1:6,1:7,1:8,1:9,1:10,1:11), and the whole stress-strain curves ofdifferent proportions of asphalt marine sand borrow mixtures.We can get the following conclusions through the experimental studies: The higher the asphalt content is, the greater the density of thespecimen is, but the overall fluctuation range is little, which between1.66~1.78g/cm3; When the asphalt’s content of asphalt mixture is11%, thecompressive strength of asphalt mixture is the largest, when asphalt’scontent is lower than this percentage, the compressive strength of thespecimen enhances with the increase of asphalt content, Otherwise, thecompressive strength decreases the increase of asphalt content; The higherthe asphalt content is, the laoger the corresponding strain of asphaltmarine sand borrow specimens is from the overall trend of the curve，themaximum can reach5%to6%; When asphalt content is higher than11%,the initial elastic modulus decreases as the asphalt content increases, whileasphalt content is lower than11%, the change of the initial elastic modulusis not obvious; Asphalt marine sand borrow mixture specimens’ wholestress strain curves include elastic deformation stage, stable elastic-plasticyield segment and non-destabilizing damage stage。Because of the discrete simulation of soft rock, this paper has reference value for the subject in the future.