Conventional triaxial compression on hollow cylinders of sandstone with various fillings: Relationship of surrounding rock with support
- 74 Downloads
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.
Key wordsmechanical properties hollow cylinder flexible retaining axial stress support stiffness
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。
关键词力学特性 厚壁圆筒 柔性支护 轴向应力 支护刚度
Unable to display preview. Download preview PDF.
- LI Shu-cai, WANG Hong-tao, WANG Qi, JIANG Bei, WANG Fu-qi, GUO Nian-bo, LIU Wen-jiang, REN Yao-xi. Failure mechanism of bolting support and high-strength bolt-grouting technology for deep and soft surrounding rock with high stress [J]. Journal of Central South University, 2016, 23(2): 440–448.CrossRefGoogle Scholar
- CHARETTE F, PLOUFFE M. Roofex: Results of laboratory testing of a new concept of yieldable tendon [C]// POTVIN Y. Deep Mining 07, Proceeding of the 4th International Seminar on Deep and High Stress Mining. Perth: Australian Centre for Geomechanics, 2007: 395–404.Google Scholar
- VARDEN R, LACHENICHT R, PLAYER J, THOMPSON A, VILLAESCUSA E. Development and implementation of the Garford dynamic bolt at the Kanowna belle mine [C]// 10th Underground Operators’ Conference. Launceston, Australia, 2008: 95–102.Google Scholar
- WU Qiu-hong, LI Xi-bing, ZHAO Fu-jun, TAO Ming, DONG Long-jun, CHEN Lu. Failure characteristics of hollow cylindrical specimens of limestone under hole pressure unloading [J]. Chinese Journal of Rock Mechanics and Engineering, 2017, 36(6): 1424–1433. (in Chinese)Google Scholar