3 results about "Thermal impact" patented technology

The present application relates to geotechnical engineering, tunnel construction and underground engineering monitoring technical field, disclose a kind of based on shield docking curtain grouting-freezing stratum temperature dissipation prediction method, comprising: calculating maximum temperature rise and thermal influence radius determine temperature sensor layout position, and utilize temperature sensor to collect stratum temperature and draw monitoring temperature time curve, and divide stratum temperature change stage after grouting, determine stage conversion point time and grouting end time, and construct segmented temperature dissipation prediction equation;According to the error between maximum temperature rise and measured temperature rise, correct maximum temperature rise as temperature threshold value to determine target temperature, and match segmented temperature dissipation prediction equation to output stratum temperature dissipation time after grouting;Stratum temperature dissipation time after grouting is used to determine freezing start plan;According to the geological condition parameters of grouting area, output cross-project data migration library.The present application can realize the quantitative prediction of stratum temperature at any time in the future and the time required to reduce to target temperature.

The present application relates to a kind of energy wall thermal influence prediction methods based on thermal bridge intensity gradient under heat and humidity coupling, constructs energy wall geometric model, adds multi-physics field module, and is coupled by heat and humidity multi-physics field module, obtains heat and humidity coupling transient numerical model;After initialization, mesh is divided, the temperature, humidity of grid node is obtained, energy wall outlet temperature is predicted, heat exchange capacity is calculated, indoor side wall surface temperature, relative humidity, heat flow density, wet flow density, thermal bridge effect intensity are predicted;Data monitoring line is added in the central axis of indoor side wall surface, thermal bridge intensity gradient is predicted, and then the maximum influence length area of thermal bridge effect is predicted.The present application is based on heat and humidity coupling transmission principle, can accurately predict the heat exchange capacity of energy wall, improve the accuracy of energy wall heat exchange capacity evaluation result in water-containing humid stratum;At the same time, clear quantitative index is proposed for the degree of influence of indoor side, provides reliable support for engineering design, optimization and risk assessment.

The invention provides a multi-stage pressure-relief permeability-increasing gas extraction promoting method for a low-permeability coal seam, and relates to the technical field of coal mine gas extraction. According to the multi-stage pressure relief and permeability increasing gas extraction promoting method for the low-permeability coal seam, a single permeability increasing means is abandoned, and multi-scale systematic transformation of the low-permeability coal body is achieved through the synergistic effect of four-stage physical fields including macroscopic cavity pressure relief, frost heaving damage, liquid nitrogen gasification explosion impact fracturing and thermal impact damage. The serialization and synergism of multiple physical fields (mechanics, low temperature, explosive shock waves and heating power) realize step-by-step pressure relief and damage superposition from macroscopic to microscopic, and obviously and enduringly improve the overall permeability of the coal seam. Compared with traditional anti-reflection technologies such as explosive blasting, the safety is remarkably improved. The phase change explosion energy caused by the liquid nitrogen and the high-temperature steam is controllable, the action range is mainly concentrated in a preformed cavity and a freezing ring, severe disturbance to surrounding rock, a top plate and a bottom plate is small, and the risk of inducing a top plate accident or coal and gas outburst is reduced.