Combination effect of seasonal freezing and artificial freezing onfrost heave of silty clay

来源期刊：中南大学学报(英文版)2010年第1期

论文作者：于琳琳 徐学燕 马琛

文章页码：168 - 173

Key words：seasonal freezing; artificial freezing; combined freezing; sine-freezing; freezing-temperature models; frost-heave degree

Abstract: To investigate the frost-heave properties of silty clay under the combination action of seasonal freezing and artificial freezing, and verify the feasibility of combined freezing, eight combined freezing experiments were performed on silty clay with water content (mass fraction) of 23.5% and 28.0%, through developed frost-heave test apparatus, in closed or open system. Two sorts of freezing temperature models, namely, constant and sine models, were applied to artificial freezing. The experimental results indicate that the frost-heave degree in seasonal freezing stage accounts for over 90% of the total in open system and it is up to 95% in closed system; the change of artificial sine-freezing temperature has no influence on the frost-heave degree in closed system, however, slight influence in open system. It is found that the variation of temperature gradient of sine-freezing specimen lags behind that of sine-freezing temperature with half phase; sine-freezing temperature model can reduce frost-heave degree of soil. Brand new technology is proposed for the application of artificial ground freezing and new study field of artificial freezing is created.

基金信息：the National Natural Science Foundation of China
Science Studies and Development Plan Foundation of Railway Ministry