摘要
通过对铜街子水电站坝基岩石进行单轴压缩与侧限膨胀试验,得出了单轴压缩条件下该区膨胀岩发生体胀、非膨胀岩发生体缩的结论。反映在试验现象上,表现为单轴压缩载荷下非膨胀岩受拉破坏和膨胀岩受剪破坏模式。基于细观力学理论对这一现象进行了探讨。铜街子水电站基础岩石的膨胀性质具有重要的工程意义,膨胀性增加了岩石内部的压应力,提高了岩石的抗剪性能,同时膨胀过程中岩石细观结构变化引起其孔隙减小,从而降低了水的渗透能力,有利于基础的稳定。
By experimental study on the uniaxial compression and confined expansion of rocks from Tongjiezi hydropower station zone, Sichuan Province, it concludes that volumes of expansive rocks expand under uniaxial compression, while volumes of non-expansive rocks contract. The experiments show that the failure modes are different for the expansive rocks and non-expansive rocks ： tension leads to the failure of non-expansive rocks, while shear leads to the failure of expansive rocks. In addition, the micro-mechanism of the phenomena is discussed. The character of rocks from Tongjiezi hydropower station is of importance to engineering behavior, that is expansion of rocks increases the inner stress and shear strength, as well as resistance of water infiltrating because of the decreasing porosity induced by micro-structure change.
出处
《水文地质工程地质》
CAS
CSCD
北大核心
2006年第2期45-49,共5页
Hydrogeology & Engineering Geology
关键词
单轴压缩
膨胀岩
细观力学
aniaxial compression
swelling rocks
micro-mechanical
