浅埋偏压隧道双侧壁导坑法开挖数值模拟研究  

Numerical Simulation and Research on Excavation of Shallow Buried Biased Tunnel with Both Sides Heading Method

作　　者：韩立志[1] HAN Li-zhi(Research Institute of Highway Ministry of Transport,Beijing 100088,China)

机构地区：[1]交通运输部公路科学研究院,北京市100088

出　　处：《公路》2020年第5期324-328,共5页Highway

基　　金：国家自然科学基金,项目编号51978059。

摘　　要：以柞山高速段小岭隧道为依托,建立数值分析模型对隧道洞口浅埋偏压段开挖与支护过程进行数值分析,探讨了围岩与衬砌材料的变形与应力变化规律。研究结果表明:偏压导致隧道洞口两侧出现超过18mm的变形差,通过锚喷支护可将该变形差控制在7mm以内;偏压隧道稳定性最不利位置出现在拱顶与底部处,在拱顶右侧与拱底左侧出现应力集中现象;双侧壁导坑法相对于预留核心土开挖法可以更好地控制拱顶处竖向变形;设计中应合理设计衬砌参数,防止锚杆等材料处于屈服状态,保证隧道施工安全。Based on the Xiaoling Tunnel on the Zhashui-Shanyang Expressway,in this paper a numerical analysis model is established to analyze the tunnel excavation and support process,and the deformation and stress variation rules of the surrounding rocks and lining materials are discussed.The simulation results show that the deformation difference of more than 18 mm caused by bias appear on both sides of the tunnel,and the deformation difference can be controlled within 7 mm by anchor spray support.The most unfavorable position of the bias appears at the vault and the bottom,and the stress concentration appear at the right side of vault and left side of the arch bottom;the two-sides wall guiding method can better control the vertical deformation of the arch compared with the reserved core soil excavation method;and the lining parameters should be reasonably designed to prevent the lining material from being yielded and ensure construction safety.

关 键 词：公路隧道 浅埋偏压 变形 有限元模拟 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]