岩石受拉破裂过程及其导水性研究

运用岩石破裂过程分析RFPA系统对单轴拉伸试验下硬岩、软岩两个试件的破裂过程进行了数值模拟,主要研究了硬岩、软岩的破裂失稳特点和导水性。试验结果表明硬岩达到应力峰值时,发生突然失稳,开始导水;软岩在拉伸作用时不会出现突发性失稳现象,而是达到极限应变时才开始破断、导水。由试验结果得出应力变化信息对于硬岩、应变变化信息对于软岩的拉伸破断和导水性具有积极的预报价值。

Failure process of rock and water flowing ability under tension stress

By RFPA(Rock Failure Process Analysis) code,the failure process and water flowing ability of hard and soft rock specimens are simulated under uniaxial tension stress.The characteristics of hard and soft rock failure process and their water flowing ability are studied.Experimental results show that hard rock failure occurs at once and begins to flow when stress reaches its peak;soft rock can't appear accident failure under tension stress,but starts to failure and flow when strain reaches its limit strain.From the experimental results,it is found that stress change information has the positive forecast value for failure and water flowing ability of hard rock,and so is strain change information for failure and water flowing ability of soft rock.