Research On Technology Of Active Cooling Supporting Structure In High Temperature Road Way

It is forcasted that maximum exploitation deepth of shaft is determined by the prevention and treatment technology of shaft heat harm in the future.The main methods of shaft heat harm treatment are inceasing mine ventilation amount method of heat extraction cooling, ice-making cooling, refrigeration cooling, and other passive cooling method, the main defects of which are heavy investment, high operating cost and low production efficiency at home and abroad now. Active cooling technique is that adding insulation materials into roadway supporting structure and forming'insulation structure'.After the construction, shaft heat harm is kept away from the outside of shaft and tunnle, and emission of heat energy to shaft and tunnle is bring down, thus aim of emission reduction, cooling and energy saving could be realized.The main purpose of research is to realize energy saving of mine, reduce thermal discharge and wind temperature of roadway. Firstly, based on mine cooling theory, theory model of roadway insulation structure energy emission reduction and cooling is deduced, which can provide theory base for roadway insulation effect analysis.Secondly, through test and experiment, new type of heat insulation material about grouting and gunite which is based on vitreous micro-bead material is developed, and it is applied on high temperature roadway insulation structure to realize heat insulation, emission reduction and cooling.Finally, through field test, theory model of roadway emission reduction and cooling is deduced. Analysis model of gunite, grouting, filling and mineral type about roadway heat and wind temperature analysis is summed up in the condition test.The research can be a basis for design and application of roadwayhea (?), emission reduction and (?) and vfor cooling effect prediction of heat insulation structure.The main reseach contents and innovation:1.Heat transmission characteristic of'heat insulation structure'and 'non-insulation structure'of roadway is studied. Calculation theory model of roadway'heat insulation structure'is established, according to heat transmission and temperature field theory of'non-insulation structure'. Analytic formula of instability coefficient k'of thermal exchanging, heat reducing, wind temperature and cooling are proposed, which can provide theory basis for design of roadway 'heat insulation structure'.2.Heat compensator conducting property, mechanism and model of vesicular, fibrous, combined vitreous micro-bead and other structure materials are analyzed, which can provide theory basis for the development of new type vitreous micro-bead insulation materials.3.Two new types of materials of "grouting and heat insulation layer" and "gunite and heat insulation layer" are developed based on vitreous micro-bead in the test. Mix proportion of 9 groups of " grouting and heat insulation layer" and " gunite and heat insulation layer" materials are tested, and rock samples of heat conduction coefficient, uniaxial compressive strength, sideway limit compressive strength and seepage coefficient are made, and test data is obtained. Based on orthonormal theory, intuitive analysis and variance analysis are carried out, considering relation of primary and secondary of heat conduction coefficient and strength index. Optimal proportion of "grouting and heat insulation layer" is vitreous micro-bead, cement, sand, additive, grouting 1#=120:350:200:20, and "gunite and heat insulation layer" optimal proportion is 200:150:150:20. Test model of heat conduction coefficient, uniaxial compressive strength, sideway limit compressive strength and mixing amount in "grouting and heat insulation layer" and "gunite and heat insulation layer "materials are obtained, which can provide test parameters for the design of heat insulation structure of roadway.4.Mechanical properties and stability of structure about "gunite insulation layer" and "grouting insulation layer" are studied in theory and numerical analysis, the results show that roadway structure can satisfy mechanical characteristics.5.Field test of stability and heat insulating property about "grouting and heat insulation layer" is carried on. Though test of wind temperature in roadway end, and comparative analysis of calculated value and measured value, it can show error range of calculated value of roadway temperature and measured value is under 10%. Calculated value can fit measured value, which can be basis for design and prediction of roadway wind temperature in similar condition.6.Mechanical properties and stability of "grouting and heat insulation layer" are observed and analyzed, and confining pressure is less than sideway limit compressive strength. Relative displacement of roof and floor usually does not exceed 40mm, and relative displacement of roadway walls usually does not exceed 35mm. Surface deformation of roadway is stable. Monitoring results show that material of " grouting and heat insulation layer" can meet the requirements of mechanical properties and stability of structure.7.Equation and analysis model of gunite, grouting, filling and mineral type about roadway heat and wind temperature analysis are derived, which can be a prediction model for roadway heat and wind temperature, which can also be a basis for design, construction and parameters prediction of roadway in similar condition, and have a remarkbly practice value.8.Analysis of technical economy shows that, roadway "heat insulation structure" can produce significant economic benefit in geothermal controlling aspects. It can produce remarkable benefits if research results can be appliedResearch and development of the task can enrich shaft and tunnel active cooling theory and technology of coal mine, provide a new way for cooling technique of roadway and present experience for compiling occupation standard and technical code of active cooling.The research task is supported by the National Natural Science Foundation of China ("Research on Mine Pressure of Caving Workforce Based on Principle of the Key Block Movement", Grant No.50774078);Open fund of State Key Laboratory ("Research on Grouting Technology of Roadway Surrounding Rock " Grant No.07KF02);"Inflexibility and flexibility waterproof obfurage material and its application of underground engineering" and "Underground cavern which can absorb energy and bear pressure" of international patent are declared. Many results of this paper are used in the project of " Researching and Developing of Underground High Efficient Parking System" which obtains the first nation jinqiao prize, Certification No. JQJ2009-X-021。...