高速公路山岭隧道进洞技术研究

Research on Technology of Mountain Tunnel into the Hole

高速公路隧道洞口段多属于强风化带,围岩破碎,且通常夹有土层,覆盖层较厚,不易形成自然拱,易产生沉降。文章结合贵州省盘兴高速营盘隧道,利用有限元计算软件ADINA对三台阶临时仰拱法与预留核心土法进行数值模拟,通过将计算结果与实测数据进行对比,验证了模型的合理性;并对两种工法进行了对比研究,结果表明,三台阶临时仰拱法在保证结构安全与控制结构变形方面较预留核心土法效果更优。

The entrance section of the highway tunnel belongs to strong weathering zone, surrounding rock is broken, and usually filled with soil, the cover is thick, hard to form a natural arch, prone to settlement. Combining with Panxing high-speed barracks tunnel in Guizhou province, the numerical simulation of the three-step temporary arching method and the reserved core soil method are carried out using finite element calculation software ADINA, the results are compared with measured data to verify the rationaliturban road; traffic accident; macro causey of the model and make a comparative study of two methods. Research shows that the three-step temporary arching method has a better effect in ensuring the structural safety and control structure deformation than the reserved core soil method.