Abstract
The mechanism of lowering temperature using slope protection of crushed stone is introduced in this paper. Through the field test of subgrade for Qinghai-Tibet railway, the variation and the evolution law of ground temperature field at the observed section, before and after the construction are discussed. The observed result shows the slope protection of crushed stone has a certain effect on lowering temperature. In additional the effect of various dimension of slope protection on the stability of subgrade is analyzed and the optimal dimension of slope protection using crushed stone is set up preliminarily. Namely, for the subgrade with height of about 1.5m the thickness of the right and the left slope protection using crushed stones with the diameter particle of 10cm were 1.3m and 0.8m, respectively. With regard to correcting the offset of ground temperature, that the thickness ratio between the left and the right slope protection is 1.7:1 is optimal.
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