山区高速公路桥隧连接段直立高陡边坡防护

本文主要高以山区高速公路桥隧连接段直立高陡边坡防护施工技术方案的论证及比选,桥隧连接段的位置大多都所处地形地貌与地质状况相对比较薄弱环节,位于这种地形位置的边坡防护要求较高,且要满足该类型边坡防护的效果。根据工程实际因素,需要进一步加强和深化高陡坡隧道洞口与桥梁相接位置的安全防护勘察工作,经现场勘察及几种防护方案的必选与论证,试图从山区高速公路桥隧连接段直立高陡边坡防护方案优化设计的角度降低防护施工难度及成本。鉴于桥隧连接段及隧道洞口现状直立高陡边坡整体基本处于稳定状态,加接延长隧道洞口明洞工程,并采用SNS主洞防护网与被动防护网相结合的防护方案合理可行,该防护方案的施工工艺简单,易操作,施工成本与施工安全风险低。

Protection of Upright and Steep Slopes in Bridge-tunnel Connection Sections of Mountain Highways

This paper mainly demonstrates and compares the technical schemes for the protection of upright and steep slopes in the bridge-tunnel connection section of the highway in the mountainous area.Most of the bridge-tunnel connection sections are located in relatively weak terrain and geomorphological conditions and geological conditions.The slope protection requirements of various terrain locations are high,and the effect of this type of slope protection must be met.According to the actual factors of the project,it is necessary to further strengthen and deepen the safety protection survey of the location where the tunnel entrance of the high and steep slope is connected to the bridge.After the site survey and the necessary selection and demonstration of several protection schemes,an attempt has been made to erect the height from the bridge-tunnel connection section of the mountain highway.The angle of optimized design of steep slope protection scheme reduces the difficulty and cost of protection construction.In view of the current situation of the bridge and tunnel connection section and the tunnel entrance,the vertical high and steep slopes are basically in a stable state.The extension tunnel tunnel open tunnel project is added,and the protection scheme combining the SNS main tunnel protection net and passive protection net is reasonable and feasible.The construction process of the scheme is simple and easy to operate,and the construction cost and construction safety risk are low.