摘要
在相似理论的基础上,以河砂、水泥、石膏为相似材料,调整其配比,制备出符合模型实验要求的砂岩和泥岩相似材料。通过对模型试样进行长期加载试验得到:当进行长期加载时,随着层状倾角的增大,位移变化先增大后减小,这是由于随着倾角的不断增加,互层岩体模型的整体刚度先减小后增加,所以导致了位移先增大后减少。利用ANSYS有限元软件对互层岩体硐室开挖模型进行稳定性分析,帮中与顶板底板处变形较大,同时由于层理的存在使得顶板位置的变形要大于帮中位置,倾角对硐室围岩变形以及应力变化具有较大影响,45°倾角时硐室围岩的变形量最大,应力集中最明显,此时容易发生滑移破坏。文中结论对实际地下工程支护和设计有一定的借鉴意义。
Firstly,on the basis of similarity theory,using river sand,cement and gypsum as similar materials,adjusting their proportions,similar sandstone and mudstone materials which meet the requirements of model experiment are prepared.Through the long-term loading test of the model specimen,it is found that the displacement increases first and then decreases with the increase of the stratified dip angle,which is due to the decrease of the overall stiffness of the interbedded rock mass model first and then increases with the increase of the dip angle,which leads to the increase of the displacement first and then decreases.Finally,the ANSYS finite element software is used to analyze the stability of the excavation model of the interbedded rock mass chamber.The deformation of the roof is larger in the middle of the wall and the roof floor.At the same time,the deformation of the roof position is larger than that in the middle of the wall because of the existence of bedding.The inclination angle has a great influence on the deformation and stress change of the surrounding rock of the chamber.The deformation of the surrounding rock of the chamber is the largest at 45°of inclination,and the stress concentration is the It is easy to slip and destroy.The conclusions in this paper can be used for reference in support and design of underground engineering.
作者
王永岩
张余标
冯学志
孙耿玉
WANG Yong-yan;ZHANG Yu-biao;FENG Xue-zhi;SUN Geng-yu(College of Mechanical and Electrical Engineering,Qingdao University of Science and Technology,Qingdao 266061,China)
出处
《科学技术与工程》
北大核心
2019年第32期281-287,共7页
Science Technology and Engineering
基金
国家自然科学基金(51674149)
山东省自然科学基金(ZR2019MEE082)资助
关键词
相似材料
倾角
互层岩体
有限元
硐室
similar material
dip angle
interbedded rock mass
finite element
chamber
