不同埋深条件下直墙拱顶巷道破裂的数值试验
投稿时间:2018-01-09  修订日期:2018-12-24  点此下载全文
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作者单位E-mail
田志超 东北大学资源与土木工程学院 bailey280@163.com 
唐春安 东北大学资源与土木工程学院  
刘业娇 内蒙古科技大学矿业研究院  
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目),国家重点研发计划项目资助
中文摘要:为研究不同埋深条件下直墙拱顶巷道围岩破裂形态,采用RFPA2D进行了数值模拟试验。通过数值试验发现:不同埋深条件下的巷道围岩均从巷道的拱脚和墙角处最先发生破坏,且沿拱脚斜向下和沿墙角斜向上扩展,最终导致巷道两帮围岩破裂失稳;同时由于深部巷道围岩的荷载较大,破坏裂缝也从巷道两帮扩展到拱顶和底板。通过分析巷道围岩应变数据,发现围岩体内径向拉应变是造成巷道围岩破坏的主要原因。该数值试验结果与有关物理试验结果具有一致性,能进一步丰富深部岩体破裂方面的研究成果,更好指导深部地下空间的开发和应用工作。
中文关键词:埋深  直墙拱顶巷道  数值试验  RFPA2D  应力应变
 
Numerical test on the rupture of straight-wall vault tunnel under different burial depths
Abstract:In order to study the fracture form of surrounding rock of straight-walled vault tunnel under different burial depths, the numerical simulation tests were carried out by RFPA. The results of numerical test showed that the surrounding rock of tunnel under different burial depths were all destroyed first from the arch foot and the corner of tunnel, then the cracks spread diagonally downwards along arch feet and diagonally upward along the corners of the wall, and eventually the fracture and instability of both side walls of surrounding rock in tunnel occurred; meanwhile, due to the large load of surrounding rock in deep tunnel, the cracks also extended from the both sides of tunnel to the arch top and the bottom floor of tunnel. Through the strain data analysis of surrounding rock, it was found that the radial strain of surrounding rock is the main cause of the fracture of surrounding rock in tunnel. The numerical test results were consistent with the related physical test results, which can further enrich the research results of fracture of deep rock mass and better guide the development and application of deep underground space.
keywords:burial depth  straight-wall vault tunnel  numerical test  RFPA2D  stress-strain
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