多破裂面走滑断层错动下隧道结构响应规律研究
Study on Response Characteristics of the Tunnel Structure under Dislocation of Strike-slip Faults with Multiple Fracture Surfaces
潘笑海 1申玉生 1王浩鱇 1王岩岩 1张昕阳 1张熙 1左雷彬2
作者信息
- 1. 西南交通大学土木工程学院,成都 610031
- 2. 河北省管道隧道和跨越技术创新中心,廊坊 065000
- 折叠
摘要
大型活动走滑断层破碎带内的岩体位错具有明显的非线性特征,使得断层带内不同区域岩土体的破坏特征各不相同,穿越断层区隧道结构变形受力十分复杂.文章依托某穿越大型走滑断层隧道工程,通过模型试验与数值模拟研究穿越多破裂面走滑断层的隧道结构响应沿纵向的分布规律.结果表明:随着断层错动量的增加,隧道水平位移不断增加,隧道变形呈现S型分布特征,且错动引起的隧道变形主要发生在断层区域内.走滑断层错动下,隧道拱腰纵向变形反弯凹陷段与围岩挤压更为明显,凸出段与围岩存在脱离趋势.隧道结构的受力破坏主要集中于两断层错动面附近,断层上盘隧道结构相较于下盘隧道结构更易被损坏.
Abstract
The rock mass dislocation in the large active strike-slip fault fracture zone exhibits significant nonlinear characteristics,resulting in varying failure features of rock and soil masses in different areas of the fault zone.This makes the deformation and stress of tunnel structure crossing fault zones increasingly complex.This paper,based on a tunnel project crossing a large strike-slip fault,uses model tests and numerical simulations to obtain the longitudi-nal distribution patterns of tunnel structure responses when crossing faults with multiple fracture surfaces.The re-sults show that with the increase in fault dislocation,the horizontal displacement of the tunnel continuously increases,showing an S-shaped deformation pattern,with dislocation-induced deformation mainly occurring in the fault zone.Under strike-slip fault dislocation,the compression is more pronounced between the reverse bending concave sec-tion of longitudinal deformation curve of the tunnel arch waist and the surrounding rock,while the convex section has a tendency to detach from the surrounding rock.The stress-induced failure of the tunnel structure is mainly con-centrated near the two fault dislocation surfaces,with the tunnel structure in the upper wall being more prone to failure compared to the lower wall.
关键词
隧道工程/结构动力响应/多破裂面/走滑断层/模型试验Key words
Tunnel engineering/Structural dynamic response/Multiple fracture surfaces/Strike-slip fault/Model test引用本文复制引用
基金项目
国家自然科学基金(52278414)
四川省自然科学基金(2022NSFSC0424)
出版年
2024
NETL
NSTL
万方数据