CAJ | 학술논문

针对青藏铁路冻土路基工程中广泛应用的低温热管,研究了其工作的能量条件和工作效果.依据观测数据对低温热管的降温效果进行了分析研究,并采用有限元方法,在实测数据作为边界条件的基础上对低温热管的30年长期工作效果的变化趋势进行了数值模拟研究.对实测数据的分析以及数值模拟计算的结果都反映出相同的趋势:热管的应用有效地降低了土体温度,并在长期工作中能够持续降低土体温度.研究表明,在气温升高趋势下,低温热管应用于寒区工程的能量基础条件未有重大改变,并能够在30年的寿命期内持续地发挥作用,使应用这种热管的冻土区路基工程热稳定性得到保证.
침대청장철로동토로기공정중엄범응용적저온열관,연구료기공작적능량조건화공작효과.의거관측수거대저온열관적강온효과진행료분석연구,병채용유한원방법,재실측수거작위변계조건적기출상대저온열관적30년장기공작효과적변화추세진행료수치모의연구.대실측수거적분석이급수치모의계산적결과도반영출상동적추세:열관적응용유효지강저료토체온도,병재장기공작중능구지속강저토체온도.연구표명,재기온승고추세하,저온열관응용우한구공정적능량기출조건미유중대개변,병능구재30년적수명기내지속지발휘작용,사응용저충열관적동토구로기공정열은정성득도보증.
Low-temperature heat pipe is widely applied for stabilizing the permafrost foundation of Qinghai-Tibet railway. The mechanism and fundamental conditions of its application are analyzed. A field test of cooling effect of heat pipe was conducted to study the energy conditions of typical cold region and structural characteristics of heat pipe. A numerical simulation by finite element method with the actually measured boundary conditions is carried out to predict the thirty years long term cooling of heat pipe in permafrost foundation. All results show that the heat pipe lowers the soil temperature effectively at the beginning and can keep lowering the temperature continuously in a long period. Thus the conclusion can be drawn that the fundamental energy conditions of the application of low-temperature heat pipe in permafrost region would not change severely under the background of global climate warming-up, and the heat pipe will be able to keep working during all its life of thirty years, ensuring the stability of the permafrost foundation.