摘要
The interaction of surrounding rock with a support system in deep underground tunnels has attracted extensive interest from researchers.However,the effect of high axial stress on tunnel stability has not been fully considered.In this study,compression tests with and without confining pressure were conducted on solid specimens and hollow cylinder specimens filled with aluminium,lead,and polymethyl methacrylate(PMMA)to investigate the strength,deformation and failure characteristics of circular roadways subjected to high axial stress.The influence of the three-dimensional stress on the surrounding rock supported with different stiffness was studied.The results indicate that the strength and peak strain of hollow cylinders filled with PMMA are higher than those of hollow cylinders filled with aluminium or lead,indicating that flexible retaining is beneficial for roadway stability.The results obtained in this paper can contribute to better understanding the support failure of a buried roadway subjected to high axial stress and thus to analyzing and evaluating roadway stability.
深部地下硐室围岩与支护的相互作用关系研究已经吸引了研究者的广泛兴趣。然而,较高轴向应力对硐室稳定性的影响并没有得到充分考虑。基于单轴和常规三轴压缩试验,采用完整试样、空心、铝棒、铅棒及有机玻璃充填的厚壁圆筒试样,模拟研究三维应力状态下不同刚度支护对圆形巷道的强度、变形和破坏特征的影响。结果表明,充填低刚度有机玻璃的试样,其强度最高,峰值变形最大,因而柔性支护有利于维持巷道的稳定。研究结果为理解具有较高轴向应力深埋巷道支护的失效行为,分析和评估巷道的稳定性提供了参考。
基金
Projects(11772357,51474103,51504092)supported by the National Natural Science Foundation of China
Project(2016YFC0600706)supported by the National Key Research and Development Program of China
