摘要
基于关角隧道实测地应力数据,文章采用有限元多元回归法和有限元改进型BP神经网络法拓展得到三维区域宏观地应力场,分析了地应力的三维分布规律。结果表明,关角隧道所穿越多处断层位置处地应力值偏高,侧压力系数偏大。考虑到其可能对隧道设计和施工产生影响,进一步分析了隧道穿越断层过程中的地应力分布规律。结果表明,地应力沿隧道穿过断层的里程呈现两头小、中间大规律,应力分布明显受断层构造的影响而存在一定的偏压现象。研究成果是后续一系列科研、设计和施工的重要基础,通过优化设计和施工措施,关角隧道大变形地段均得到有效控制。
Based on measured in-situ geostress data, a three-dimensional geostress field is obtained by the finiteelement multiple regression and finite element improved BP neural network methods, and the three-dimensional dis-tribution law of in-situ stress is analyzed. The results show that the geostress value and the lateral pressure coeffi-cient of the fault are somewhat high. Considering potential influences on tunnel design and construction, the geo-stress distribution rules are analyzed for the excavation of a tunnel passing through a fault. The results show that thedistribution rule of geostress along the length of the tunnel in the fault is similar to the normal curve, the stress distri-bution is obviously affected by the fault structure and asymmetric pressure occurs. These research findings are animportant foundation for future scientific research, design and construction, and ultimately deformation of the Guan-jiao tunnel was effectively controlled by optimizing design and construction measures.
作者
陈志敏
余云燕
赵德安
李国良
CHEN Zhimin;YU Yunyan;ZHAO De＇an;LI Guoliang(Key Laboratory of Road ＆ Bridges and Underground Engineering of Gansu Province, Lanzhou Jiaotong University, Lanzhou 730070;School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070;School of Civil Engineering, Northwest University for Nationalities, Lanzhou 730030;China Railway First Survey and Design Institute Group Co. Ltd., Xi＇an 710043)
出处
《现代隧道技术》
EI
CSCD
北大核心
2018年第3期54-60,共7页
Modern Tunnelling Technology
基金
国家自然科学基金(11662007)
甘肃省建筑节能和建设科技专项(JK2014-15)
长江学者和创新团队发展计划滚动资助(IRT_15R29)
关键词
隧道
断层
地应力
多元回归法
神经网络法
大变形
Tunnel
Fault
Geostress
Multiple regression
Neural network method
Large deformation
