常州砂性地层联络通道解冻规律研究
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摘要
人工冻结联络通道施工常采用跟踪注浆解决软弱地层工后融沉问题,为此必须掌握解冻温度场的变化规律。以常州市轨道交通1号线某隧道联络通道冻结法施工为背景,将冻结阶段现场实测与温度场数值模拟进行对比,验证数值模拟方法正确性,并通过数值模拟对自然解冻与强制解冻规律进行分析。结果表明,60℃～90℃循环热水强制解冻周期为33.5～22 d,较自然解冻周期的160 d缩短了5～7倍,不同温度的强制解冻解冻周期大致呈线性变化。强制解冻完成次序依次为上部结构、冻结管内侧土体、冻结管外侧土体、集水井底部。冻结壁厚度不同工程可采用不同温度热水循环进行强制解冻,冻结壁厚度较薄时可适当降低热水温度;强制解冻融沉注浆前期应将重点放在联络通道上部结构侧边及顶部,后期应将重点放在底部。
In the construction of artificial freezing contact channel,track grouting is often used to solve the problem of thaw settlement in soft stratum. Therefore,it is necessary to grasp the law of thawing temperature field.With the background of freezing method construction in the connecting passage of a tunnel on Changzhou City Metro Line 1,the measurement with temperature field numerical simulation in the freezing stage was compared to verify the correctness of the numerical simulation method. Then the law of the natural thawing and freezing of forced by numerical simulation was studied. The results showed that the forced thawing cycle of circulating hot water 60℃ ～90℃ were 33.5 ～ 22 days,about 5 ～ 7 times was shortened comparing with the160 days of natural thawing cycle. The time of forced thawing at different temperatures is approximately linear. The order of forced thawing is the upper structure,the inner of the freezing pipe,the outer of the freezing pipe,and the bottom of the collecting well is thawed finally. For different thickness of frozen wall,hot water with different temperature can be used for forced thawing. For the thinner thickness of freezing wall,the hot water temperature can be reduced properly. In the early stage of forced thaw grouting,the emphasis shall be placed on the upper structure's side and top,and the latter shall be placed at the bottom.
In the construction of artificial freezing contact channel,track grouting is often used to solve the problem of thaw settlement in soft stratum. Therefore,it is necessary to grasp the law of thawing temperature field.With the background of freezing method construction in the connecting passage of a tunnel on Changzhou City Metro Line 1,the measurement with temperature field numerical simulation in the freezing stage was compared to verify the correctness of the numerical simulation method. Then the law of the natural thawing and freezing of forced by numerical simulation was studied. The results showed that the forced thawing cycle of circulating hot water 60℃ ～90℃ were 33.5 ～ 22 days,about 5 ～ 7 times was shortened comparing with the160 days of natural thawing cycle. The time of forced thawing at different temperatures is approximately linear. The order of forced thawing is the upper structure,the inner of the freezing pipe,the outer of the freezing pipe,and the bottom of the collecting well is thawed finally. For different thickness of frozen wall,hot water with different temperature can be used for forced thawing. For the thinner thickness of freezing wall,the hot water temperature can be reduced properly. In the early stage of forced thaw grouting,the emphasis shall be placed on the upper structure's side and top,and the latter shall be placed at the bottom.
引文
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[11]肖朝昀.人工地层冻结冻土帷幕形成与解冻规律研究[D].上海:同济大学,2007.(Xiao Zhaojun.Research on the forming and thawing of frozen soil walls by artificial ground freezing method[D].Shanghai:Tongji University,2007.(in Chinese))
[12]袁云辉,杨平,王海波.人工水平冻结冻土帷幕强制解冻温度场数值分析[J].南京林业大学学报(自然科学版),2011,35(4):117-120.(Yuan Yunhui,Yang Ping,Wang Haibo.Thermal field numerical analysis of artificial thawing of horizontal freezing soil wall[J].Journal of Nanjing Forestry University(Natural Science Edition),2011,35(4):117-120.(in Chinese))
[13]袁云辉,杨平.冻结加固盾构端头土体温度场数值分析[J].地下空间与工程学报,2010,6(5):1053-1059.(Yuan Yunhui,Yang Ping.Numerical analysis of soil thermal field in freezing reinforcement of shield arriving[J].Chinese Journal of Underground Space and Engineering,2010,6(5):1053-1059.(in Chinese))
[14]樊文虎,杨平,蒋大有,等.全断面注浆管棚矩形冻结加固技术与实测分析[J].地下空间与工程学报,2017,13(2):551-558.(Fan Wenhu,Yang Ping,Jiang Dayou,et al.Rectangular freeing reinforcement technology of full-face grouting pipe-roof and measuring analysis[J].Chinese Journal of Underground Space and Engineering,2017,13(2):551-558.(in Chinese))
[15]杨平,陈瑾,张尚贵,等.软弱地层联络通道冻结法施工温度及位移场全程实测研究[J].岩土工程学报,2017,39(12):2226-2234.(Yang Ping,Chen Jin,Zhang Shanggui,et al.Study on whole range monitoring for temperature and displacement field of the cross-passage by AGF in soft soil[J].Chinese Journal of Geotechnical Engineering,2017,39(12):2226-2234.(in Chinese))
[16]陈成,杨平,张婷.高承压富含水层人工强制解冻温度场数值分析[J].郑州大学学报(工学版),2012,33(2):81-85.(Chen Cheng,Yang Ping,Zhang Ting.Numerical analysis of artificial thawing temperature field in high-confined aquifer reinforcement[J].Journal of Zhengzhou University(Engineering Science),2012,33(2):81-85.(in Chinese))
[17]杨平,张婷.城市地下工程人工冻结法理论与实践[M].北京:科学出版社,2015.(Yang Ping,Zhang Ting.Theory and practice of artificial freezing method in urban underground engineering[M].Beijing:Science Press,2015.(in Chinese))
[2]肖朝昀,胡向东,张庆贺.多排管局部冻结冻土壁温度场特征[J].岩石力学与工程学报,2007,26(增1):2694-2700.(Xiao Zhaoyun,Hu Xiangdong,Zhang Qinghe.Characters of temperature field in frozen soil wall with multirow freeze-tubes and limited depth freezing[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(Supp.1):2694-2700.(in Chinese))
[3]胡俊,杨平.大直径杯型冻土壁温度场数值分析[J].岩土力学,2015,36(2):523-531.(Hu Jun,Yang Ping.Numerical analysis of temperature field within large-diameter cup-shaped frozen soil wall[J].Rock and Soil Mechanics,2015,36(2):523-531.(in Chinese))
[4]覃伟,杨平,金明,等.地铁超长联络通道人工冻结法应用与实测研究[J].地下空间与工程学报,2010,6(5):1065-1071.(Qin Wei,Yang Ping,Jin Ming,et al.Application and survey analysis of freezing method applied to ultra-long connected aisle in metro tunnel[J].Chinese Journal of Underground Space and Engineering,2010,6(5):1065-1071.(in Chinese))
[5]Yu L L,Xu X Y,Ma C.Combination effect of seasonal freezing and artificial freezing on frost heave of silty clay[J].Journal of Central South University of Technology,2010,17(1):163-168.
[6]Chen Y L,Azzam R,Wang M,et al.The uniaxial compressive and tensile tests of frozen saturated clay in Shanghai area[J].Environmental Earth Sciences,2011,64(1):29-36.
[7]Waston G H,Slusarchuk W A,Rowley R K.Determination of some frozen and thawed properties of permafrost soils[J].Canadian Geotechnical Journal,1973,10(4):592-606.
[8]曹红林.地铁隧道冻结法施工融沉控制方案及实施[J].地下空间与工程学报,2010,6(2):387-390,395.(Cao Honglin.Thawing settlement control of subway tunnel construction by artificial ground freezing[J].Chinese Journal of Underground Space and Engineering,2010,6(2):387-390,395.(in Chinese))
[9]袁云辉.盾构进出洞水平冻结冻土帷幕解冻方式及解冻规律研究[D].南京:南京林业大学,2010.(Yuan Yunhui.Study on thawing styles and laws of artificial horizon freezing wall in shield starting and arriving construction[D].Nanjing:Nanjing Forestry University,2010.(in Chinese))
[10]肖朝昀,胡向东.人工地层冻结冻土自然解冻与强制解冻实测分析[J].长江大学学报(自然科学版),2009,6(3):92-95.(Xiao Zhaojun,Hu Xiangdong.Analysis of natural thawing and forced thawing of frozen ground in artificial stratum[J].Journal of Yangtze University(Natural Science Edition),2009,6(3):92-95.(in Chinese))
[11]肖朝昀.人工地层冻结冻土帷幕形成与解冻规律研究[D].上海:同济大学,2007.(Xiao Zhaojun.Research on the forming and thawing of frozen soil walls by artificial ground freezing method[D].Shanghai:Tongji University,2007.(in Chinese))
[12]袁云辉,杨平,王海波.人工水平冻结冻土帷幕强制解冻温度场数值分析[J].南京林业大学学报(自然科学版),2011,35(4):117-120.(Yuan Yunhui,Yang Ping,Wang Haibo.Thermal field numerical analysis of artificial thawing of horizontal freezing soil wall[J].Journal of Nanjing Forestry University(Natural Science Edition),2011,35(4):117-120.(in Chinese))
[13]袁云辉,杨平.冻结加固盾构端头土体温度场数值分析[J].地下空间与工程学报,2010,6(5):1053-1059.(Yuan Yunhui,Yang Ping.Numerical analysis of soil thermal field in freezing reinforcement of shield arriving[J].Chinese Journal of Underground Space and Engineering,2010,6(5):1053-1059.(in Chinese))
[14]樊文虎,杨平,蒋大有,等.全断面注浆管棚矩形冻结加固技术与实测分析[J].地下空间与工程学报,2017,13(2):551-558.(Fan Wenhu,Yang Ping,Jiang Dayou,et al.Rectangular freeing reinforcement technology of full-face grouting pipe-roof and measuring analysis[J].Chinese Journal of Underground Space and Engineering,2017,13(2):551-558.(in Chinese))
[15]杨平,陈瑾,张尚贵,等.软弱地层联络通道冻结法施工温度及位移场全程实测研究[J].岩土工程学报,2017,39(12):2226-2234.(Yang Ping,Chen Jin,Zhang Shanggui,et al.Study on whole range monitoring for temperature and displacement field of the cross-passage by AGF in soft soil[J].Chinese Journal of Geotechnical Engineering,2017,39(12):2226-2234.(in Chinese))
[16]陈成,杨平,张婷.高承压富含水层人工强制解冻温度场数值分析[J].郑州大学学报(工学版),2012,33(2):81-85.(Chen Cheng,Yang Ping,Zhang Ting.Numerical analysis of artificial thawing temperature field in high-confined aquifer reinforcement[J].Journal of Zhengzhou University(Engineering Science),2012,33(2):81-85.(in Chinese))
[17]杨平,张婷.城市地下工程人工冻结法理论与实践[M].北京:科学出版社,2015.(Yang Ping,Zhang Ting.Theory and practice of artificial freezing method in urban underground engineering[M].Beijing:Science Press,2015.(in Chinese))