明挖隧道主体结构受温度梯度的影响分析

Analysis on Influence of Temperature Gradient on Main Structure of Excavated Tunnel

摘要:

为研究温度梯度对明挖隧道主体结构的影响规律，以及如何加强结构的温度效应抗力、阻止和控制温度引起既有结构的开裂。以明挖隧道为研究对象，分别建立敞开段、暗埋段三维计算模型，针对不同温度梯度工况，计算分析了明挖隧道主体结构内力受温度作用的影响。研究结果表明，温度梯度作用产生的附加内力较大，且对结构各部位的影响程度不同；相同梯度温度作用下，不同隧道断面产生的附加内力差异较大，暗埋段较敞开段的温度效应更为显著，在工程中应给予重视。

Abstract:

To study the impact of temperature gradients on the main structure of excavated tunnels, and how to enhance the temperature effect resistance of the structure, prevent and control the cracking of the existing structure caused by temperature, taking an excavated tunnel as the research object, the three-dimensional calculation models are established for the open and buried sections, respectively. For the different temperature gradient conditions, the internal forces of the main structure of excavated tunnels affected by temperature are calculated and analyzed. The research results indicate that the additional internal forces generated by temperature gradients are relatively large, and the impacts on different parts of the structure vary. Under the same temperature gradient, the additional internal forces generated by different tunnel sections vary greatly. The temperature effect in the buried section is more pronounced than that in the open section, which should be given attention in engineering.