黄金科学技术 ›› 2018, Vol. 26 ›› Issue (2): 195-202.doi: 10.11872/j.issn.1005-2518.2018.02.195
林格1,宫凤强1,2*
LIN Ge 1,GONG Fengqiang 1,2
摘要:
为了研究不同受力维度下岩石峰值应力、峰值应变与失稳的关系,分别对红砂岩进行一维、二维、三维受力条件下的单轴抗压试验、变角板剪切试验和直接剪切试验以及三轴压缩试验。试验结果显示:单轴压缩试验中,峰值应力和峰值应变变异系数分别为6.61%和9.36%;变角板剪切试验中,峰值应力和峰值应变平均变异系数分别为5.69%和19.81%;直接剪切试验中,峰值应力和峰值应变平均变异系数分别为4.32%和14.74%;三轴压缩试验中,峰值应力和峰值应变平均变异系数分别为6.03%和7.44%。上述研究表明:当红砂岩处于一维和三维受力状态时,峰值应力和峰值应变均可以作为评判红砂岩是否失稳的指标,但峰值应力比峰值应变作为评判指标的可靠性更高;当红砂岩处于二维受力状态时,只有峰值应力能作为评判红砂岩是否失稳的指标。上述研究规律不仅对评判室内试验中岩石是否失稳具有重要意义,而且对评判岩土工程中岩石是否处于安全状态提供理论依据。
中图分类号:
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