Deterioration Process And Mechanism Of Slate And Phyllite Following Water-Hot Process In The Middle Reaches Of Bailong River

This thesis takes two types of low-grade metamorphic rocks,such as slope slate and phyllite,which are closely related to landslides,debris flows and collapses in the middle reaches of Bailong River,with water-normal temperature,water-low temperature,water-high temperature and water-low temperature-high temperature.The water-thermal environment is the research background.The geological camps of slope surface slate and phyllite are used as the research center,and the deterioration process and deterioration mechanism in different water-thermal environments are the research centers,and the slope slate and phyllite are adopted.Correlation with typical geological disasters such as landslides and debris flows in the middle reaches of the Bailong River,physical and mechanical properties of the two types of low-grade metamorphic rocks,such as slope slate and phyllite,both internal and external geological forces and different water-heat processes.In the aspect of microscopic observation,the water-heat-induced process and mechanism of low-grade metamorphic rocks in the surface slate and phyllite of the slopes in the middle reaches of the Bailong River are studied.The main contents are as follows:Deterioration process and mechanism of slate and phyllite in slopes under the influence of geological and military forces.Firstly,through the correlation analysis of the geological hazard distribution of slate,phyllite and landslide,mudslide and other geological hazards in the study area,the research background is proposed.Secondly,the research is from “physical,acoustic,mechanical deterioration law and surface topography”.In the four aspects of the degradation law,the micro-degradation law of structure and mineral composition,and the micro-crack meso-fracture expansion process,the deterioration law of the two types of low-grade metamorphic rocks,such as slope slate and phyllite,is studied..Through density experiments,water content samples,sonic experiments,and rebound experiments,the density,water content,wave velocity,and springback of slate and phyllite in different depths are analyzed to obtain physics,acoustics,and mechanical properties of slate and phyllite.The law of change in depth.Through the polarized light microscopy experiment,the variation of the microstructure of the low-grade metamorphic rocks between slate and phyllite was obtained.The multi-dimensional X-ray diffraction(XRD)test reveals the microscopic deterioration of mineral composition of low-grade metamorphic rocks in slate,phyllite and phyllite.Scanning electron microscopy reveals the mesoscopic deterioration of slate and phyllite surface morphology.Analysis of internal and external geological forces of the slate and phyllite in the surface of the slope caused by the study area.The analysis of the internal and external geological forces that cause the deterioration of slate and phyllite in the slope of the study area is the basic premise for studying the degradation process and mechanism of low-grade metamorphic rocks such as slate and phyllite in the slope.The deterioration of two types of low-grade metamorphic rocks,such as slope slate and phyllite,is closely related to the topography,geological structure,stratum lithology,hydrogeology,earthquake,meteorological characteristics and other conditions.Through the systematic analysis of the meteorological data of the study area and the monitoring of the surface temperature of the slope,the water-thermal process leading to the deterioration of the slate and phyllite in the slope is systematically analyzed,and five different water-thermal processes are summarized,which are caused by rainfall.The “water-normal temperature” process,the “water-low temperature” process caused by rainfall and surface low temperature,the “water-high temperature” process caused by rainfall,evaporation and surface high temperature,caused by heavy rainfall,strong evaporation and high surface temperature.The “water-high temperature” process,as well as the “water-high temperature-low temperature” process caused by rainfall,evaporation,surface high temperature,and surface low temperature.Degradation process and simulation of two types of low-grade metamorphic rocks in slope surface under different water-heat interactions.From the two aspects of "deformation of macroscopic morphology,physical,acoustic,mechanical degradation,and finite element simulation",the degradation of two types of low-grade metamorphic rocks,including slate and phyllite in the slope of five water-heat processes,is studied.law.Through the macroscopic observation,the variation of the macroscopic morphology of slate and phyllite under five kinds of water-heat effects was obtained.Five kinds of water-heat were analyzed by density experiment,water content sample,sonic experiment and uniaxial compression test.After the process,the surface slate,phyllite macroscopic morphology,physical,acoustic and mechanical properties were changed under five kinds of water-heat effects;through the simulation of finite element software,the samples were obtained under five kinds of water-heat.The internal stress distribution and deformation characteristics effectively complement the indoor test.Deterioration mechanism of two types of low-grade metamorphic rocks in slope surface under different water-heat interactions.The study studied the surface slate and phyllite of five kinds of slopes under the action of water and heat from three aspects: the deterioration of the surface morphology of the sample,the change of mineral and chemical composition,and the microscopic crack propagation process.Deterioration of low-grade metamorphic rocks.Through the rock thin slice(slice)polarized light microscopy experiment,the microstructure changes of two kinds of low-grade metamorphic rocks of slate and phyllite in five different water-heat processes were analyzed.Through multi-functional X-ray diffraction(XRD)test,the changes of mineral composition,content,chemical composition and content of slate and phyllite low-grade metamorphic rocks after five different water-heat treatments were analyzed to reveal slate,The deterioration of microscopic materials of phyllite and two types of low-grade metamorphic rocks under different water-heat effects.The environmental scanning electron microscopy(SEM)experiments were carried out to analyze the surface topography of two types of low-grade metamorphic rocks in slate and phyllite under five different water-heat effects,revealing the mesoscopic deterioration of slate and phyllite surface morphology..Study on the degradation mechanism of slate and phyllite structures on slopes under different water-heat interactions.Firstly,the numerical simulation method was used to obtain the internal stress distribution and deformation characteristics of the sample under the action of five kinds of water-heat.The internal structural changes and minerals of the sample under five water-heat tests were compared with the results of laboratory tests.The change of composition has a serious impact on its physical and mechanical properties.Secondly,through qualitative judgment,the deterioration mechanism of the five kinds of water-heating samples is revealed.Finally,the damage variable based on porosity is established and passed through the damage variable.Establish a good regression relationship with macroscopic physics,mechanical parameters,microscopic mineral composition and chemical composition,and quantitatively determine the deterioration mechanism of slate and phyllite.