Abstract Based on the practice of horizontal freezing construction at the Dongfengjing #2 tunnel portal of the railway station on the shield-driven Suzhou metro line 2, this paper studies the law of saline water temperature development at various stages using real-time monitoring of the temperature field of the cup-shaped frozen wall, calculations regarding the wall thickness of various frozen soils, closuring time and development speed. The monitoring results show that the temperature of the testing hole in the plate reinforced zone was lower than that of the cylinder reinforced zone during the whole freezing time. For the same observation hole, the temperature was higher at greater depths during the prephase of the freezing time, while the temperature was lower during the later stage of freezing. For the cement-reinforced silt, the temperature was lower than that of the silty clay within the scope of the same freezing energy and time, and its time to release potential heat is two times that of the silt. The freezing effect of cement-reinforced silt is better than that of cement-reinforced silt clay in terms of the closuring time, the thickness of the frozen wall, the average development speed and the average temperature of the frozen wall.
Abstract：
Based on the practice of horizontal freezing construction at the Dongfengjing #2 tunnel portal of the railway station on the shield-driven Suzhou metro line 2, this paper studies the law of saline water temperature development at various stages using real-time monitoring of the temperature field of the cup-shaped frozen wall, calculations regarding the wall thickness of various frozen soils, closuring time and development speed. The monitoring results show that the temperature of the testing hole in the plate reinforced zone was lower than that of the cylinder reinforced zone during the whole freezing time. For the same observation hole, the temperature was higher at greater depths during the prephase of the freezing time, while the temperature was lower during the later stage of freezing. For the cement-reinforced silt, the temperature was lower than that of the silty clay within the scope of the same freezing energy and time, and its time to release potential heat is two times that of the silt. The freezing effect of cement-reinforced silt is better than that of cement-reinforced silt clay in terms of the closuring time, the thickness of the frozen wall, the average development speed and the average temperature of the frozen wall.
WANG Jie-1,
Yang-Ping-1,
WANG Xu-Nuo-1 etc
.Measurement and Research of the Horizontal Freezing Temperature After Cement Soil Reinforcement in a Shield Launch Shaft[J] MODERN TUNNELLING TECHNOLOGY, 2011,V48(6): 99-104
2011, Vol. 48 