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A series of Laboratory studies were carried out on the cooling effects of crushed rock layers with different particle sizes under closed and open tops. The thicknesses of crushed-rock layers are 130 cm and the mean particle sizes are 8.3 cm, 14.8 cm, 22.1 cm and 27.1 cm, respectively. The experimental results indicate that the cooling effects of the crushed-rock layers with open tops are less than...
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