【作者】 陈金玉；

【导师】 吕康成；

【作者基本信息】 长安大学 ， 桥梁与隧道工程， 2007， 硕士

【摘要】 随着我国高速公路的快速发展,特别是西部大开发和振兴东北老工业基地政策的进一步落实,在西部高海拔与东北部寒冷地区也将出现更多的公路隧道,这些隧道由于受寒冷气候的影响,极易产生隧道冻害现象。隧道衬砌开裂、剥落、挂冰和路面冒水、结冰等病害,严重消弱了隧道的使用功能和寿命。为了整治这些隧道冻害,管理者曾投入了大量的人力、物力、财力,然而效果却不尽人意。针对这一现状,本文以吉林省新交洞隧道为依托工程,对寒区公路隧道的保温防冻问题进行了研究。论文在对国内外寒区隧道应用的抗防冻措施的调研分析的基础上,通过对隧道温度场的测试和冻害机理特征的多角度分析,揭示了隧道围岩的温度场随时间的各种变化规律及隧道冻害产生的直接或间接的原因、条件,并针对这些原因、条件阐述了对应的各种防治措施。而后针对寒区隧道的这些特点,提出以防排水为主的综合保温防冻措施。其中,采取的在衬砌下隅角背后设置保温层与在衬砌紧靠防水层一侧设置环向电加热带的措施,在国内尚属首次,为我国寒区隧道保温防冻技术开辟了新途径,具有重大的工程实际意义和广阔的应用前景。本文还通过对新交洞隧道洞内外环境的气温、二次衬砌背后及不同深度的围岩体的温度进行监测和分析,得到了隧道内不同部位的温度场分布规律,为防冻保温层的设计提供了依据;针对温度场分布的情况,根据热传导的原理,通过计算分析确定保温层的厚度公式,并且通过实例对公式进行了验证,又根据新交洞的实际情况,对其采用的保温层进行了厚度计算;最后将加热措施这一实际问题简化为热学模型,根据虚拟热源法,计算出有电加热带影响下的围岩温度场分布。更多还原

【Abstract】 As the rapid development of our country’s highway, and the implementation of the state’s the policy of the Great Development of the Western Regions and the northeast old industrial base promotion, a lot of tunnels will be built in elevations areas or circumpolar areas in the big west. These tunnels suffer easily cold damages. Cold damages of the lining surface, peeling off, ice covering, watering and freezing of the road surface in tunnels have been greatly weakening the service capacity and life. The managers cost a lot for the cold damage control project, but the result doesn’t satisfying. Aiming at the present situation, taking Jilin XinJiaoDong tunnel as actual background, this paper studies on the problem of heat preservation and antifreeze in the tunnel in cold areas.On the base of investigating and analyzing all kinds of anti-freezing measurements applied in the worldwide, by means of monitoring and analyzing of temperature field and characters of cold damages mechanics, discovered the regularity of temperature field as the time and all kinds of the reasons of cold damages. Moreover, aiming at characters of highway tunnels in cold areas, this paper puts forward comprehensive heat preservation and antifreeze measures by the most of waterproof and drainage. Among those, adopting the measures of setting up thermal insulating layer on the back of lining at the bottom corners and installing electro-thermal wires between the water-proof layer and the lining has been the first application at home, and discovered a new way to solving the cold damage problems in tunnels in cold areas, this has major meaning of engineering practice and a great construction application prospect.By means of monitoring and analyzing of air temperature, temperature backside secondary linings and temperature of surrounding rock within certain depth, the paper gets variation laws of temperature of different position inside XinJiaoDong Tunnel, and provided the basis for the design of the anti-freezing layer. Aiming at characters of temperature field, by the principle of adiabatic, we calculated and decided the thickness of the layer by way of equivalent conversion. It is verified by actuality, and by the real situation, the thickness of insulating layer is caculated. At last, the realistic with heating measure is simplified to heat model, by assumptive heat source method; we can determine the temperature distribution of surrounding rock with the electro-thermal wire.更多还原