盾构始发水泥土加固后水平冻结温度实测研究  

Measurement and Research of the Horizontal Freezing Temperature After Cement Soil Reinforcement in a Shield Launch Shaft

作　　者：王杰[1] 杨平[1] 王许诺[1] 鲍俊安[1] 

机构地区：[1]南京林业大学土木工程学院,南京210037

出　　处：《现代隧道技术》2011年第6期99-104,共6页Modern Tunnelling Technology

基　　金：苏州市科技局苏州轨道交通专项课题(Zxj0802)

摘　　要：依托于苏州地铁二号线火车站东风井2﹟洞门盾构始发水平冻结加固工程,通过实时监测杯型冻土壁温度场,分析了不同阶段的盐水温度规律,以及在不同深度、不同土质和不同冻结区域的土体温度发展特征;并计算了不同土质冻土壁厚度、交圈时间和发展速度。监测结果分析表明,在整个冻结期间,任意时间都是板块体加固区测温孔温度低于圆柱体加固区测温孔温度;同一测温孔中,冻结前期水平入土越深温度越高,冻结后期水平入土越深温度越低;在相同冻结能量和冻结时间内,水泥土加固粉砂土比粉质粘土温度要低;水泥土加固粉质粘土释放潜热的天数是水泥土加固粉砂土的2倍;在冻结效果方面,包括冻土壁交圈时间、冻结壁厚度、冻结壁平均发展速度、冻结壁平均温度,水泥土加固粉砂土比水泥土加固粉质粘土更好。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.

关 键 词：水平冻结 水泥土加固 盾构始发 温度 

分 类 号：U455.49[建筑科学—桥梁与隧道工程]