单轴压缩试验条件下含水饱和度对应力应变曲线的影响

Effect of water content on stress-strain curve under uniaxial compression test

为了研究水对岩石力学行为影响的机理,除力学性质外,还需要关注应力应变曲线随不同水条件的变化情况,这是表示力学行为的最基本特征之一。在本研究中,研究了含水饱和度对岩石单轴抗压强度和应力应变曲线的影响。使用安山岩、凝灰岩、砂岩、花岗岩和大理岩进行了6种含水条件下的单轴压缩试验。试验结果表明,安山岩、凝灰岩、砂岩和花岗岩的应力应变曲线随含水饱和度的变化而变化。另一方面,却未观察到含水饱和度对大理岩应力应变曲线的影响。根据试验结果,讨论了由于含水饱和度降低而导致的强度增加机理,研究了峰值强度随水分条件变化的变化规律,并在此基础上考虑了不同水分条件下应力应变曲线之间的关系。

In order to study the mechanism of the influence of water on the mechanical behavior of rock,in addition to mechanical properties,it is necessary to pay attention to the change of stress-strain curve with different water conditions,which is one of the most basic characteristics of mechanical behavior.In this study,the influence of water content on uniaxial compressive strength and stressstrain curve of rock is studied.Uniaxial compression tests under six water-bearing conditions were carried out using andesite,tuff,sandstone,granite and marble.The experimental results show that the stress-strain curves of andesite,tuff,sandstone and granite change with the change of water content.On the other hand,the influence of water content on the stress-strain curve of marble has not been observed.According to the experimental results,the mechanism of strength increase due to the decrease of water content is discussed,and the variation law of peak strength with the change of water condition is studied.On this basis,the relationship between stress-strain curves under different water conditions is considered.