正断层错动诱发上覆黏土中隧道变形破坏数值模拟研究
摘要:针对隐伏正断层活动引发上覆黏土中的隧道位错破坏研究相对不足,基于不排水条件的总应力分析方法,展开隧道破坏的有限元计算。数值计算结果与试验数据表明,正断层错动影响下,上覆黏土变形由下盘一侧向上盘一侧可划分为静止区、剪切区和刚体位移区。上覆土体中产生的不均匀沉降区域随埋深逐渐减小,使得地下结构物的影响范围随埋深而减小,但破坏程度则逐渐增加。当隧道与周边土体可近似为绑定接触时,基岩断层投影附近区域以受弯变形破坏为主,而远离基岩断层投影的两侧区域则呈现受拉破坏。隧道拱顶衬砌在基岩下盘一侧受拉,在基岩上盘一侧则为受压。拱底与拱顶的轴向应变分量呈反对称分布。
Abstract:Damage of tunnel in clay induced by underlying normal faulting is not tully understood. I his study carries out a numerical study on this problem using total stress analysis method. Both of the calculated results and centrifuge data show that deformation of the clay layer is classified as a stationary zone, a shearing zone and a rigid body zone. The area of differenti al, ettlement zone decreases with depth, resulting a reduction in area of influencing zone and an increase in extent of damage with depth. When the tunnel surface is tied to the surrounding soil, the tunnel nearby the bedrock fault is mainly suhiected to bending while the area far from the bedrock fault is mainly subjected to tension. At the tunnel crown, tension strain is observed on the footwall side while compression strain on the hanging wall side.
中文标题：
正断层错动诱发上覆黏土中隧道变形破坏数值模拟研究
Numerical Simulation of Tunnel Deformation in Clay Induced by Normal Faulting
作者：
黄辉
Huang Hui
作者简介:黄辉,男,1963年生,壮族,广西田东县人,高级工程师,主要从事岩土工程勘察工作。E-mail:xmhuanghui1963@126.com
通讯地址：
核工业华南工程勘察院厦门工程勘察分院, 福建厦门 361000
SouthChinaEngineeringInvestigationInstituteoftheNuclearIndustry,Xiamen361000,Fujian,China
中图分类号:TU45
doi:10.3969/j.issn.1007-2993.2016.06.005
出版物：岩土工程技术
收稿日期:2016-08-30
关键词:隐伏正断层,上覆黏土,隧道,数值模拟
Key words:underlying normal fault,overlying clay layer,tunneling,numerical model
文档包含图片数量：图片(0)张
文档包含表格数量：表格(0)个
参考文献：
基金项目：
- 文件大小:
- 1.29 MB
- 下载次数:
- 60
-
高速下载
|
|
