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以北京大兴国际机场场地为对象开展“锅盖效应”现场试验,在试验地区的地下深度250 cm的范围内布设传感器,对冬季地温变化进行监测。监测数据显示浅部的地温变化幅度大于深部的地温变化幅度,深部的地温变化较浅部迟滞。通过计算露点位置,认为冬季新机场试验区“锅盖效应”的最大影响深度为50 cm,并且“锅盖效应”影响深度会随着温度场而发生变化。
In the field of Beijing Daxing International Airport, the “lid effect” field test was carried out. Sensors were installed within a depth of 250 cm in the test area to monitor the change of winter ground temperature. Monitoring data show that the magnitude of the change in the ground temperature in the shallow part is larger than that in the deep part, and the change in the ground temperature in the deep part lags behind in the shallow part. By calculating the location of the dew point, it is considered that the maximum depth of influence of the “lid effect” in the new airport pilot area in winter is 50 cm, and the influence of the “lid effect” will vary with the temperature field.