The Stugy Of Soft Rock Reology Law Under The Effect Of Temperature, Pressure And Water

The underground engineering has been more widespread, more large-scale, more deep into the ground with an unprecedented speed than ever. As the decrease of the shallow resources, the increase of the mining depth of underground minerals and the construction of the railway tunnel, more and more soft rock are present in the underground rock engineering. Soft rock is a type of engineering rock mass that would have obvious plastic deformation under the engineering pressure. The soft rock can damage the engineering stability which will lead to accidental incidents for its plasticity, dilatability, disintegration,large deformation,and rheological property.In the environment of high temperature and high pressure,with long time water corrosion, the deep mass of soft rock, for its low compressive strength, will change radically in its organization structure,behavioral characteristic and engineering response. What’s worse, the rodeway and tunnel will be unstable and even damaged for its rheological property. Hence it is critical for the research of the soft rock rheology law under the coupling effect of temperature,pressure and waterBased on many theoretical studies and by doing amount of experiments, we have compared and made statistics about the deformation of the sample of limestone under the single field and coupled field. We then made the conclusion:the rheological property manifests itself more obviously in water than under natural state; under multi-field coupling, the confining pressure can inhibit the changing rate, which will increase with the rising of temperature.Scientific computation method is widely used in various fields of engineering. In this thesis, we use finite element method to conduct the experiment. By making numerical simulation on ANSYS, we analyse the limestone sample under these circumstances:1) axial compression and confining pressure under single field;2) temperature and axial compression coupling;3) temperature and confining pressure coupling;4) temperature, axial compression and confining pressure coupling. By altering one of these variables(temperature, axial compression and confining pressure), we compared and analysed the equivalent stress nephogram, deformation diagram, time history diagram and deformation process animation of limestone under various conditions. The experiment not only verify the experimental conclusion visually, but also avoid the defects of inconvenient sampling, long period and hard working in the course of experiment.