论文部分内容阅读
针对实际工程中影响热响应测试的诸多因素,建立了基于地埋管储热模型的瞬时模型,模拟分析了加热功率、钻孔直径、水箱容积及回填材料对岩土热物性参数测试结果的影响。通过对同一口测试井两次不同功率、测试时长的实测,验证了该模型的准确性。研究结果表明:在设定不同的加热功率下,岩土导热系数和钻孔内传热热阻的测试结果分别相差4.94%和0.32%,而每延米换热量测试结果相差24.99%,同时验证了50 h为热响应测试的最小时长;热响应测试仪的水箱容积对导热系数的影响较小,仅影响了加热流体达到稳定状态的时间;当钻孔直径为110,130,150 mm时,随着回填材料导热系数的增大,岩土导热系数的变化率逐渐减小,整体增幅均在0.09 W/(m·K)内,表明回填材料对热响应测试影响较小。
In view of many factors affecting the thermal response test in practical engineering, an instantaneous model based on buried pipe heat storage model was established and the influence of heating power, borehole diameter, water tank volume and backfill material on geothermal parameters testing was simulated . The accuracy of this model is verified by measuring two different power and test duration of the same test well. The results show that the test results of thermal conductivity of geomaterials and heat transfer resistance in boreholes differ by 4.94% and 0.32%, respectively, with different heating powers, while the test results of heat exchange per meter differ by 24.99% The minimum time for thermal response test was verified for 50 h. The tank volume of thermal response tester had little influence on the thermal conductivity, which only affected the time for the heating fluid to reach steady state. When the diameter of the hole was 110, 130 and 150 mm, The thermal conductivity of the material increases, the rate of change of geothermal conductivity decreases gradually, the overall increase is within 0.09 W / (m · K), indicating that the backfill material has little effect on the thermal response test.