高寒地区公路隧道防寒泄水洞设置技术研究
发布时间：2018-10-17 09:31
【摘要】：鉴于青藏高原高寒多年冻土地区特长公路隧道防寒泄水洞设置技术研究不足的现状，论文结合西部交通建设科技项目“高寒公路隧道多年冻土力学特性及变形控制技术研究”，以国道214线共和至玉树公路，洞口标高4300米的姜路岭特长隧道防寒泄水洞为依托工程，通过对温度场和结构受力情况的大批量现场实测，基于有限元理论的理论分析和数值模拟（ANSYS）手段，，对高寒多年冻土区公路隧道防寒泄水洞的温度场、温度-重力耦合作用下的受力特性、防寒保温和新型施工技术进行了系统研究，为该地区公路隧道防寒泄水洞的设计施工和防冻保温提供了指导。 针对依托工程特点，开展了系统的环境温度和围岩及衬砌支护结构温度场测试分析。得出了洞内外环境温度的年变化规律和三维温度场数值模拟的荷载条件。在距离防寒泄水洞洞口较近处温度年变化曲线和洞外变化趋势很相似，只是洞外的温度振幅比洞内的偏大。洞内的温度变化总是被动的伴随着洞外的温度变化而变化，同时距离洞口越远，被动变化的周期性和规律性减弱。对防寒泄水洞温度场数值模拟时，将最不利的温度函数（低温月份洞外大气温度函数）作为洞口段的温度载荷条件。 基于温度场现场实测结果，将低温月份洞外大气温度函数作为荷载加到山体表面和防寒泄水洞支护结构表面，采用非稳态热传导有限元法对温度场进行数值模拟。对整个体系分为主洞先行和防寒泄水洞先行两种不同施作模式下的模拟分析，同时研究了在水平方向上以4.5米为一个计算工况，防寒泄水洞从分离到合并的体系冻融圈变化规律。 采用间接耦合法，将第三章温度场数值计算的结果作为温度荷载，和重力荷载一起施加在结构上，对防寒泄水洞和主洞体系进行三维温度场和应力场耦合计算，模拟分析实际施工过程中围岩耦合场综合应力的变化规律，根据计算结果推荐了防寒泄水洞合并设置结构形式及断面设计参数。 通过对一般寒区隧道防排水系统保温措施的借鉴，从依托工程的保温设计着手，研究了保温材料的性能，运用有限元热分析技术，从施加和未施加保温层方面，着重分析研究了保温材料的保温效果。由洞内二次衬砌表面温度是否为正确定了防寒泄水洞设防长度为450米。
[Abstract]:In view of the insufficient research on the technology of setting up the cold proof and releasing water tunnel of the super long highway tunnel in the alpine permafrost area of the Qinghai-Xizang Plateau, this paper combines with the western transportation construction project "study on the mechanical characteristics and deformation control technology of the permafrost in the alpine highway tunnel". Based on the highway between Gonghe and Yushu on the 214th national highway and the 4300 meter elevation of the tunnel at the entrance of Jianglu Ling, the cold prevention and drainage tunnel of Jianglu Ling is used as the support project. The field measurements of the temperature field and the stress on the structure are carried out in large quantities. Based on the theoretical analysis of finite element theory and numerical simulation of (ANSYS), the temperature field of highway tunnel in alpine permafrost region under the coupled action of temperature and gravity is studied. The cold insulation and new construction technology are studied systematically, which provides the guidance for the design and construction of the cold proof and discharge tunnel in this area. According to the characteristics of engineering, the temperature field of surrounding rock and lining support structure are tested and analyzed systematically. The annual variation of ambient temperature inside and outside the tunnel and the load conditions of three dimensional numerical simulation of temperature field are obtained. The annual variation curve of temperature is very similar to that outside the tunnel, but the amplitude of temperature outside the tunnel is larger than that in the hole. The variation of temperature in the hole always changes passively with the change of temperature outside the hole. At the same time, the farther away from the hole, the periodicity and regularity of the passive change weaken. The most unfavorable temperature function (the temperature function outside the tunnel) is taken as the temperature load condition of the tunnel in the numerical simulation of the temperature field of the cold-proof drain tunnel. Based on the measured results of the temperature field, the temperature field is simulated numerically by the unsteady heat conduction finite element method (FEM), which is applied to the mountain surface and the supporting structure surface of the cold-proof drain tunnel as the load of the temperature function outside the low-temperature month tunnel. The whole system is divided into two different application modes: main tunnel first and cold drain tunnel. At the same time, the horizontal direction of 4.5 meters is studied as a calculation condition. The freeze-thawing cycle of the freeze-thawing system is changed from the separation to the amalgamation of the freeze-thawing tunnel. Using the indirect coupling method, the numerical results of the third chapter temperature field are applied to the structure together with the gravity load as the temperature load, and the three-dimensional temperature field and stress field of the cold-proof drain tunnel and the main tunnel system are calculated. The variation law of the comprehensive stress of the surrounding rock coupling field in the actual construction process is simulated and analyzed. According to the calculation results, the combined structure form and section design parameters of the cold-proof drain tunnel are recommended. Through the reference to the insulation measures of the tunnel waterproofing and drainage system in the common cold area, the performance of the insulation material is studied by relying on the insulation design of the project. The finite element thermal analysis technique is used to apply and not apply the insulation layer. The thermal insulation effect of thermal insulation material is analyzed and studied emphatically. According to whether the surface temperature of the secondary lining in the tunnel is positive or not, the length of the tunnel fortification is 450 meters.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U457.2
本文编号：2276236
[Abstract]:In view of the insufficient research on the technology of setting up the cold proof and releasing water tunnel of the super long highway tunnel in the alpine permafrost area of the Qinghai-Xizang Plateau, this paper combines with the western transportation construction project "study on the mechanical characteristics and deformation control technology of the permafrost in the alpine highway tunnel". Based on the highway between Gonghe and Yushu on the 214th national highway and the 4300 meter elevation of the tunnel at the entrance of Jianglu Ling, the cold prevention and drainage tunnel of Jianglu Ling is used as the support project. The field measurements of the temperature field and the stress on the structure are carried out in large quantities. Based on the theoretical analysis of finite element theory and numerical simulation of (ANSYS), the temperature field of highway tunnel in alpine permafrost region under the coupled action of temperature and gravity is studied. The cold insulation and new construction technology are studied systematically, which provides the guidance for the design and construction of the cold proof and discharge tunnel in this area. According to the characteristics of engineering, the temperature field of surrounding rock and lining support structure are tested and analyzed systematically. The annual variation of ambient temperature inside and outside the tunnel and the load conditions of three dimensional numerical simulation of temperature field are obtained. The annual variation curve of temperature is very similar to that outside the tunnel, but the amplitude of temperature outside the tunnel is larger than that in the hole. The variation of temperature in the hole always changes passively with the change of temperature outside the hole. At the same time, the farther away from the hole, the periodicity and regularity of the passive change weaken. The most unfavorable temperature function (the temperature function outside the tunnel) is taken as the temperature load condition of the tunnel in the numerical simulation of the temperature field of the cold-proof drain tunnel. Based on the measured results of the temperature field, the temperature field is simulated numerically by the unsteady heat conduction finite element method (FEM), which is applied to the mountain surface and the supporting structure surface of the cold-proof drain tunnel as the load of the temperature function outside the low-temperature month tunnel. The whole system is divided into two different application modes: main tunnel first and cold drain tunnel. At the same time, the horizontal direction of 4.5 meters is studied as a calculation condition. The freeze-thawing cycle of the freeze-thawing system is changed from the separation to the amalgamation of the freeze-thawing tunnel. Using the indirect coupling method, the numerical results of the third chapter temperature field are applied to the structure together with the gravity load as the temperature load, and the three-dimensional temperature field and stress field of the cold-proof drain tunnel and the main tunnel system are calculated. The variation law of the comprehensive stress of the surrounding rock coupling field in the actual construction process is simulated and analyzed. According to the calculation results, the combined structure form and section design parameters of the cold-proof drain tunnel are recommended. Through the reference to the insulation measures of the tunnel waterproofing and drainage system in the common cold area, the performance of the insulation material is studied by relying on the insulation design of the project. The finite element thermal analysis technique is used to apply and not apply the insulation layer. The thermal insulation effect of thermal insulation material is analyzed and studied emphatically. According to whether the surface temperature of the secondary lining in the tunnel is positive or not, the length of the tunnel fortification is 450 meters.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U457.2
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