水平层状围岩变形规律及渐进破坏机理研究
Research on the Deformation Law and Progressive Failure Mechanism of Horizontal Layered Surrounding Rock
王喜明 1吕行 2梁媚 3蒙俊宁2
作者信息
- 1. 中铁四局集团第五工程有限公司 江西九江 332000
- 2. 南宁五象金众投资有限责任公司 广西南宁 530000
- 3. 广西交通设计集团有限公司 广西南宁 530000
- 折叠
摘要
层状岩体受结构面影响,其破坏模式和破坏机制明显不同于其他岩体.在层状岩体中修建隧道,围岩稳定性问题比较突出.以东风路隧道为背景,针对层状岩体隧道围岩的破坏模式及渐进变形破坏机制进行了研究,结论如下:水平层状岩体隧道围岩稳定性影响因素主要有地质因素、施工因素、工程因素;水平层状岩体的变形破坏模式主要为顺层滑移破坏和弯折破坏;层状围岩渐进变形破坏具有典型的逐层递进性演化特征,靠近初始临空条件的岩层优先出现离层,随后逐层垮塌破坏,垮塌破坏的跨度则逐层减小,直至平衡后,最终形成梯形拱的破坏形态.
Abstract
The layered rock mass is affected by the structural plane,and its failure mode and failure mechanism are obviously different from other rock masses.The stability of surrounding rock is a prominent problem when con-structing a tunnel in the layered rock mass.Taking the Dongfeng Road Tunnel as the background,the failure mode and progressive deformation and failure mechanism of the surrounding rock of the tunnel in the layered rock mass are studied.Conclusions are as follows;the influence factors of the stability of the surrounding rock of the tunnel in the horizontal layered rock mass mainly include geological factors,construction factors and engineering factors;the deformation and failure modes of the horizontal layered rock mass are mainly bedding slip failures and bending fail-ures;the progressive deformation and failure of layered surrounding rock have typical layer-by-layer progressive evolution characteristics:the rock strata near the initial free condition preferentially separates and then collapses layer by layer,and the span of the collapse failure decreases layer by layer until equilibrium and finally forms the failure mode of the trapezoidal arch.
关键词
层状岩体/隧道围岩/破坏模式/破坏机理Key words
Layered rock mass/Tunnel surrounding rock/Failure mode/Failure mechanism引用本文复制引用
出版年
2024
NETL
NSTL
万方数据