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Abstract Aiming at horizontal freezing engineering of double-route metro，an integrated model experiment system is established based on similarity theory. Frost heaving and thawing settlements of the metro are analyzed by model test under freezing wall¢s intensity is guaranteed. Experimental results indicate that the connecting time of freezing wall ties up with frost heaving of soil，and strong moisture migration makes frost heaving of soil comparatively larger for prior freezing of uplink tunnel. Two thawing modes are contrastively analyzed in the test. In forcible thawing condition，thawing settlement phenomenon of soil is not obvious，and thawing settlement of near ground in forcible thawing condition is only 47 percent of thawing settlement of near ground in natural thawing condition. The phenomenon shows that the forcible thawing mode can reduce thawing settlement of soils.
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Received: 28 March 2009
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