Study On Mechanical Behavior Of Soft Rock In Coupled Effect Of High Temperature, High Pressure And Seepage

As world energy and safety situation growing tense day after day, more and moreunderground engineering develop one after another. Underground fuel depot takingstrategic energy reserve as goal and underground military installation taking thenational defense as the goal changes over to depth underground one after anotherbecause the missile technology progress. The rock mass project is in the more complexenvironment field (high temperature, high pressure and seepage). Because three fieldshas the complex coupling function, therefore, it has the important theory significanceand the application value to study on mechanical behavior of soft rock in coupledeffect of high temperature, high pressure and seepage.This article embarks from three universal principles, the law of conservation ofmass, the line momentum balance principle and the law of conservation of energy.According to three fundamental equations, equation of continuity, line momentumbalance equation (equation of motion or equation of static equilibrium) andenergy-conservation equation as well as corresponding natural equation deducedtemperature field-seepage field-distortion field three coupling function controlsystem of equations for the saturated rock mass.In base of theory research to the theological model of the predecessor, building atheological model which not only to illustrate the influence of horizontal loading, butalso to show the creep deformation of accelerating phase, at the same time, thetraditional model of porous medium was to be improved, and the factor of temperaturewas to be draw into, a model of porous medium that considering factor of temperaturewas to be built, which has been had application in soft rock, at last we got the creepmodel of soft rock in deep part of underground that considering the temperature.From infinitesimal body angle, this article gives the theoretical analysis to rockmechanics performance and creep performance occurring change which as a result ofthe water influence. This article establishes a set of foundation rock creep constitutiveequation method in situation of considering water influence.Through three axle creep experiment contained the temperature and the water hasconfirmed the creep theory. And further obtains the conclusion that the creep strainincrease along with the temperature increase and the creep speed also increases alongwith the temperature increase. Soft rock bearing capacity and the elasticity coefficientall reduce along with the moisture increase. The creep deformation and the maximumcreep speed increases along with the moisture increase.Carries on the value simulation with the ANSYS software to some projectexample, the article visually present bottom drum phenomena of tunnel adjacent underthe thermal-stress coupling. And confirm the experimental conclusion once more.