盾构出洞水平冻结加固杯形冻土壁温度场监测分析-《郑州大学学报(工学版)》

文章信息/Info

Title:: Survey Analysis of Temperature Field in Cup—-shaped Frozen Soil Wallof Horizontal Freezing Reinforcement for Shield Tunnelling

作者:: 夏江涛; 杨平.; 淮阴工学院,建筑工程学院,江苏,淮安,223001;南京林业大学,土木工程学院,江苏,南京,210037, 南京林业大学,土木工程学院,江苏,南京,210037

Author(s):: XIA Jiangtao; YANG Ping; 1．School of Architecture and Civil Engineering，Huaiyin Institute ofTechnology，Huai’an 223001，China；2．School of Civil En·gineering，Nanjing Forestry University，Nanjing 210037，China

Keywords:: shield tunnelling; horizontal freezing; cup—shaped frozen soil wall; temperature field

摘要:: 依托于某地铁车站盾构出洞水平冻结加固工程,通过实时监测对杯型冻土壁温度场,分析了盐水温度、冻结区不同区域土体温度的发展特征,并计算了冻结区不同区域冻土壁交圈时间和发展速度.监测结果分析表明,同一测温孔内埋深较深的测点与埋深较浅的测点相比,板块加固体区的冻土交圈时间较长,发展速度较慢,而圆柱体加固区的冻土交圈时间与发展速度变化并不明显;冻土与地下连续墙闻界面处,板块加固区的冻土平均发展速度明显比圆柱体加固区快,圆柱体加固区冻土壁交圈时间为31 d,其平均发展速度为20.9 mm/d,而板块加固区不同区域冻土壁平均发展速度差异明显,最快发展速度为60.5 mm/d,最慢发展速度为35.3 mm/d.

Abstract:: Based on horizontal freezing reinforcement project for a subway station，a study on the developmentof temperature field in cup—shaped frozen soil wall was carried out by site monitoring．The development char—acteristies of salt—water temperature and soil temperature in freezing zone were analyzed．And the time of fro—zen soil wall closure and the velocity of the growth were calculated during the primary freeze period．Accordingto site monitoring analysis，compared with temperature sensor of the shallower depth in the same observationhole，time of frozen soil wall closure of temperature sensor of the deeper depth was longer and its velocity wasslower in plate reinforced zone，while time of frozen soil wall closure and average velocity of the growth did notchange significantly in cylinder reinforced zone；Average velocity of the growth of frozen soil in plate reinforcedzone was faster than that of cylinder reinforced zone in the inerface between frozen soil and underground con—tinuous wall obviously．Time of frozen soil wall closure was 3 1 d and average velocity of the growth was 20．9mm／d in cylinder reinforced zone．Growth velocity displayed a marked difference in plate reinforced zone，thefast velocity was 60．5mm／d and the slowest one was 35．3mm／d．