不同应力环境下岩石力学属性及破坏模式研究

Research on Mechanical Property and Failure Pattern of Rock Samples in Different Stress Conditions

为了研究岩石力学属性及破坏模式的表现规律,在某矿山4个地应力测点处采集岩石样品,结合原岩应力数据,开展了不同应力条件下的室内岩石力学试验。研究表明,单轴受压的软弱岩石通常表现为X型剪切破坏,硬岩则以拉张破坏为主。随着围压增加,岩石均向斜切型剪切破坏模式靠拢,峰值强度和残余强度显著增加,尤其是残余强度增长最快。结合现场应力条件和力学试验得知,五矿1测点处巷道围岩发生岩爆的可能性最大。

In order to research on the behavior law of mechanical property and failure pattern of rock samples in different stress conditions,rock samples were collected from four in-situ stress measuring points in a certain mine.Afterwards,combining with in-situ stress data,rock mechanics tests in different stress conditions were carried out.The research showed that weak rocks usually shows X-shear failure pattern and hard rock shows extension failure pattern in uniaxial compression test.With the increase of confining pressure,the failure pattern of rock samples changes into oblique-shear failure mode,the peak strength and the residual strength have been increased rapidly,especially,the residual strength grows fastest.Combining on-site stress conditions with mechanical test,it is concluded that the rock-burst in surrounding area of measuring point Wuhkang 1 was most impossible.