摘要
采用FLAC3D软件模拟分层拟作法和多层耦合工法,开挖某特殊用途大型地下洞室全过程,分析开挖引起的围岩变形、应力和塑性区分布状况.发现多层耦合法可以减小塑性区分布范围,开挖各工况围岩稳定性良好,可作为大型地下洞室安全施工的一种工法.通过模拟多层耦合法在Ⅲ、Ⅳ级围岩和不同地应力条件下的施工效果,研究该工法的地质条件适用性.相对而言,围岩质量是更敏感的影响因素,对围岩稳定性影响更大;构造应力场条件下围岩变形和塑性区显著增大.
In this paper,the FLAC3D software was adopted to simulate excavation process of special used large underground cavern in inverted construction and multi-layer coupling method.And the paper analysed the deformation,stress,and plastic zone status of surrounding rock influenced by excavation.Multi-layer coupling excavation technology can be used as a safety construction method for the construction of large underground cavern,as it efficiently decreased the volume of plastic zone and kept the stability of surrounding rock during excavation.Further,we applied the multi-layer coupling excavation technology on Ⅲ,IV-class rock and Ⅲ-class rock with tectonic stress to study its applicability of the geological conditions.In contrast with stress condition,the quality of surrounding rock,as a more sensitive parameter,impacted the stability of excavation effects in underground cavern greatly.The displacement and plastic zone volumes of surrounding rock increased obviously under high tectonic stress condition.
出处
《北京交通大学学报》
CAS
CSCD
北大核心
2013年第1期46-51,共6页
JOURNAL OF BEIJING JIAOTONG UNIVERSITY
关键词
地下洞室
多层耦合法
围岩变形
应力分布
塑性区
围岩稳定
FLAC3D
underground cavern
multi-layer coupling excavation technology
deformation of surrounding rock
stress distribution
plastic zone
stability of rock
FLAC3D
