Study On Mechanical And Fluctuating Properties Of The Water Cooling High Temperature Marble And Limestone

The engineering properties of high temperature rock after cooling treatment directly affect the exploration and development of underground space and resources,storage of nuclear waste and stability evaluation of underground engineering constructions after high temperature disaster.Water cooling is generally used on high temperature rock engineering,but few studies about the water cooling high temperature rock have been carried out.This dissertation aims to carry out the researches on the change rules of the physical,mechanical and fluctuating properties of the high temperature marble and limestone samples with water cooling treatment.The main research contents are listed as follows.Firstly,the acoustic wave,uniaxial compression and physical tests had been carried out on high temperature limestone with water cooling treatment,and the physical,fluctuating and mechanical properties had been obtained.The change rules of the mechanical and fluctuating properties of the high temperature rock had been studied by comprehensively analyzing and comparing the variation of the parameters with temperature.Secondly,the acoustic wave and uniaxial compression tests had been carried out on high temperature marble after different cooling treatment,such as water cooling treatment and natural cooling treatment.The changes of the longitudinal wave velocity,dominant frequency,attenuation coefficient,peak stress and elastic modulus had been analyzed,and the mechanical and fluctuating properties under different cooling methods also had been studied.Finally,acoustic wave tests had been carried out on high temperature cube limestone sample with natural cooling treatment,the change rules of the longitudinal wave velocity vertical and parallel to the stratum of the limestone had been analyzed;moreover,the change rules of the anisotrophy after different temperature treatment had been studied.These researches can provide references for the engineering detection and stability evaluation of the water cooling high temperature rock and can also provide guidance for the choice of cooling method of the high temperature rock.