摘要
岩溶作为不良地质条件对隧道施工造成较大危害,溶洞的存在影响围岩压力、支护结构受力和施工安全性。以贵州省惠水至兴仁高速公路某岩溶隧道为依托,建立岩溶隧道预留核心土五步开挖法施工FLAC3D模型,对其施工关键技术研究,结果表明:右拱腰上方溶洞的存在导致隧道围岩压力分布不均,右拱腰处有整体塑性滑动的危险,靠近溶洞侧支护结构受力不利。对溶洞进行封闭处理后,围岩稳定性得到提高,围岩位移得到一定程度的控制,但效果并不显著,施工时除进行溶洞封闭外还应从其他技术手段方面进行处理。
As the unfavorable geological condition, karst causes larger damage to tunnel construction. The existence of karst cave influences the surrounding rock pressure, load - carrying capability of supporting structure and construction safety. Basing on a karst tunnel of Huishui - Xingren Expressway in Guizhou province, the FLAC3D model for construction of adopting five - step excavation method for pre - reserving core coil for karst tunnel is built, so as to make the research on key technology of construction. The results show that： the existence of karst cave above the right haunch causes uneven distribution of surrounding rock pressure ; the right haunch has a danger of overall plastic slide; the load - carrying capability of supporting structure near the karst cave is unfavorable. After the sealing displacement of surrounding the construction, except for treatment of karst cave, the stability of surrounding rock is improved, and the rock is controlled to a certain degree. However, the effect is not remarkable. During sealing treatment of karst cave, other technical measures are needed to be adopted
出处
《北方交通》
2016年第10期51-55,共5页
Northern Communications
关键词
岩溶
公路隧道
施工技术
数值模拟
Karst
Highway tunnel
Construction technology
Numerical simulation
