送风口处支护结构受力分析及断面型式研究

Stress Analysis and Sectional Form Study of Supporting Structure at Air Outlet

对于送风口处支护内力分析及断面形式等方面的研究,现行规范及学者研究得较少,现通过对通风风道在不同矢跨比的工况下支护结构受力状态及断面形式的分析研究,得出了通过在通风通道与主隧道的交界处采取如下措施可在保证支护结构安全的同时增大通风面积:(1)增加风道板厚度的同时在支护结构中增设钢拱架;(2)增设锚杆,利用锚杆的抗拔力约束支护结构变形。该成果为送风口处的支护结构设计及断面形式的选取提供了一定程度的参考价值。

The current specification and scholars study are a few about the inner force analysis and section form of supporting at air supply outlet.According to the study and analysis of stress state and section form of supporting structure of ventilation duct under the different conditions of rise span ratio,the article introduces the increment of ventilation area at the same time able to ensure the safety of supporting structure at the junction of ventilation duct and main tunnel by taking the following measures of adding the thickness of duct plate and at same time to add steel arch frame in supporting structure,and adding the anchor bolts.The pulling resistance of anchor bolt is used to restrain the deformation of supporting structure so as to provide some reference for the design of supporting structure and selection of section form at ventilation duct.