Point heat source mobile distributed seepage monitoring system and monitoring method thereof
A monitoring system, distributed technology, applied in the direction of measuring devices, permeability/surface area analysis, suspension and porous material analysis, etc., can solve the problems of adding measuring points, unable to eliminate the influence of seepage direction, and affecting monitoring accuracy, so as to avoid Ineffectiveness, meeting long-term monitoring needs, and solving the effect of spatial resolution problems
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[0062] Example 1
[0063] In order to verify the effectiveness of the point heat source seepage monitoring system developed by the present invention, a Picture 9 The test model shown (H1=100mm, H2=600mm, H3=600mm, B=300mm, L=800mm) carried out a calibration test under the influence of the dual factors of seepage velocity and seepage direction. The shell of the model box is spliced by 3mm thick steel plates, and a square steel tube frame is set on the outside of the box as a lateral support. There are 4 drain pipes at the bottom of the box, and valves are installed on the drain pipes to control the flow. 4 monitoring tubes 7 (PE-RT tube, outer diameter 20mm, wall thickness 2mm) are pre-embedded in the box, and their axis and infiltration direction (from top to bottom) are respectively 90°, 70°, 50°, 30 °. First, lay 10cm thick gravel at the bottom of the box as a filter layer, and then fill river sand to the design elevation. Before filling the river sand, a steel bar is ins...
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[0068] Example 2
[0069] On the basis of Example 1, using Figure 8 The improvement scheme shown is to pour pure water into the monitoring pipe 7 and perform calibration tests under different seepage speeds. Each working condition ln(λ-λ θ ) See the curve of change over time Picture 11 . It can be seen that as the seepage velocity increases, the temperature drops faster, ln(λ-λ θ ) Has a strong correlation with the seepage velocity. According to ln(λ-λ θ ) The line type of the time history curve is divided into three stages: rapid cooling section (0~200s), transition section (200s~300s), slow cooling section (300s~temperature stability). In the fast cooling section and slow cooling section, ln(λ-λ θ ) The time history curve is approximately linear. Using the data from 50s to 200s and 300s to 600s, respectively, ln(λ-λ θ ) The slope ξ of the time history curve in these two periods v1 And ξ v2 , See Table 2. ξ v1 And ξ v2 The absolute values of both increase with the inc...
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