冻结管新型排布方式温度场敏感性分析
|
摘要
运用有限元软件建立三维数值模型,对不同深浅型冻土壁温度场的发展与分布规律进行研究,分析不同因素对该温度场的影响规律及其降温规律。数值计算表明,在设计冻结方案下,深浅不同的冻土帷幕满足加固范围要求,形成闭合帷幕的时间为12d;导热系数的变化也影响温度场的发展,随着导热系数的增加,土体达到冻结温度的时间逐渐缩短;随着比热的增大,土体降温速度减缓,最终的冻结温度也有所升高;相变潜热对温度场的发展没有显著的影响。在实际工程中,只要这种深浅冻结管达到等同的效果,就可以为以后的发展节约资金和材料,得到的结论可以为以后的工程提供相关的理论依据。
The finite element software is used to establish a three-dimensional numerical model to study the development and distribution law of the temperature field in different depth frozen soil walls,and to analyze the influence law and cooling law of different factors on the temperature field.The numerical calculation shows that under the design freezing scheme, frozen soil curtains with different depths meet the requirements of the reinforcement range, and the time to form the closed curtain is 12 days. The change of thermal conductivity also affects the development of temperature field. with the increase of thermal conductivity, the time for soil to reach freezing temperature is gradually shortened.With the increase of specific heat, the cooling rate of soil slows down and the final freezing temperature also increases. The latent heat of phase change has no significant influence on the development of temperature field. In actual projects, as long as the depth-depth freezing pipes achieve the same effect, they can save funds and materials for future development. the conclusions obtained can provide relevant theoretical basis for future projects.
The finite element software is used to establish a three-dimensional numerical model to study the development and distribution law of the temperature field in different depth frozen soil walls,and to analyze the influence law and cooling law of different factors on the temperature field.The numerical calculation shows that under the design freezing scheme, frozen soil curtains with different depths meet the requirements of the reinforcement range, and the time to form the closed curtain is 12 days. The change of thermal conductivity also affects the development of temperature field. with the increase of thermal conductivity, the time for soil to reach freezing temperature is gradually shortened.With the increase of specific heat, the cooling rate of soil slows down and the final freezing temperature also increases. The latent heat of phase change has no significant influence on the development of temperature field. In actual projects, as long as the depth-depth freezing pipes achieve the same effect, they can save funds and materials for future development. the conclusions obtained can provide relevant theoretical basis for future projects.
引文
[1]胡俊,王效宾,袁云辉.盾构隧道端头杯型冻结壁温度场发展与分布规律研究[M].北京:中国水利水电出版社,2015.
[2]胡俊.高水压砂性土层地铁大直径盾构始发端头加固方式研究[D].南京:南京林业大学,2012.
[3]胡俊,杨平,董朝文,等.盾构始发端头化学加固范围及加固工艺研究[J].铁道建筑, 2010, 15(2):47-51.
[4] HU JUN,WANG XIAOBIN, JIANG BIRONG. Numerical analysis of temperature field of vertical frozen soil wall reinforcement at shield shaft[C]//2014 3rd International Conference on Micro Nano Devices, Structure and Computing Systems(MNDSCS 2014),Singapore,2014,(3):4-10.
[5] JUN HU, YONG LIU, HONG WEI, et al. Finite-element analysis of the heat transfer of the horizontal ground freezing method in shield-driven tunneling.[J]International journal of geomechanicsASCE, 2017, 17(10):04017080.
[6] YONG LIU, JUN HU, HONG WEI, et al. A direct simulation algorithm for a class of beta random fields in modelling material properties[J]. Computer methods in applied mechanics and engineering,2017,326:642-655.
[7] JUN HU, YONG LIU, YUPING LI, et al. Artificial ground freezing in tunnelling through aquifer soil layers:a case study in Nanjing Metro Line 2[J].KSCE Journal of civil engineering, 2018, Published online.
[8]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.
[9]胡俊.盾构隧道端头垂直冻结加固不同冻结管直径的温度场数值分析[J].铁道建筑,2014,19(9):57-60.
[10]胡俊,刘勇,曾晖.新型管幕冻结法不同管幕填充形式的温度场数值对比分析[J].森林工程,2015,31(6):135-141.
[11]胡俊,卫宏,刘勇.冻土帷幕设置加热限位管时温度场数值分析[J].隧道建设,2016,36(6):688-694.
[12]胡俊,刘勇.加热限位管对冻土帷幕厚度的影响研究[J].森林工程,2016,32(2):69-74.
[13]胡俊.水泥改良前后土体冻结温度及力学特性试验研究[J].铁道建筑, 2013, 18(4):156-159.
[14]李岩,刘波,张建,新.竖向直排冻结条件水平冻胀力试验研究[J]岩土力学,2014,35(11):3200-320.
[15]吴雨薇,胡俊,汪树成.中空圆环形冻结管单管冻结温度场数值分析[J].海南大学学报(自然科学版),2018,36(1):41-48.
[16]吴雨薇,胡俊,汪树成.不同盐水温度下单管冻结温度场数值分析[J].森林工程,2017,33(6):60-66.
[2]胡俊.高水压砂性土层地铁大直径盾构始发端头加固方式研究[D].南京:南京林业大学,2012.
[3]胡俊,杨平,董朝文,等.盾构始发端头化学加固范围及加固工艺研究[J].铁道建筑, 2010, 15(2):47-51.
[4] HU JUN,WANG XIAOBIN, JIANG BIRONG. Numerical analysis of temperature field of vertical frozen soil wall reinforcement at shield shaft[C]//2014 3rd International Conference on Micro Nano Devices, Structure and Computing Systems(MNDSCS 2014),Singapore,2014,(3):4-10.
[5] JUN HU, YONG LIU, HONG WEI, et al. Finite-element analysis of the heat transfer of the horizontal ground freezing method in shield-driven tunneling.[J]International journal of geomechanicsASCE, 2017, 17(10):04017080.
[6] YONG LIU, JUN HU, HONG WEI, et al. A direct simulation algorithm for a class of beta random fields in modelling material properties[J]. Computer methods in applied mechanics and engineering,2017,326:642-655.
[7] JUN HU, YONG LIU, YUPING LI, et al. Artificial ground freezing in tunnelling through aquifer soil layers:a case study in Nanjing Metro Line 2[J].KSCE Journal of civil engineering, 2018, Published online.
[8]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.
[9]胡俊.盾构隧道端头垂直冻结加固不同冻结管直径的温度场数值分析[J].铁道建筑,2014,19(9):57-60.
[10]胡俊,刘勇,曾晖.新型管幕冻结法不同管幕填充形式的温度场数值对比分析[J].森林工程,2015,31(6):135-141.
[11]胡俊,卫宏,刘勇.冻土帷幕设置加热限位管时温度场数值分析[J].隧道建设,2016,36(6):688-694.
[12]胡俊,刘勇.加热限位管对冻土帷幕厚度的影响研究[J].森林工程,2016,32(2):69-74.
[13]胡俊.水泥改良前后土体冻结温度及力学特性试验研究[J].铁道建筑, 2013, 18(4):156-159.
[14]李岩,刘波,张建,新.竖向直排冻结条件水平冻胀力试验研究[J]岩土力学,2014,35(11):3200-320.
[15]吴雨薇,胡俊,汪树成.中空圆环形冻结管单管冻结温度场数值分析[J].海南大学学报(自然科学版),2018,36(1):41-48.
[16]吴雨薇,胡俊,汪树成.不同盐水温度下单管冻结温度场数值分析[J].森林工程,2017,33(6):60-66.