屈服度与冲击性指标BIM关系的试验研究

Experimental Study on the Relationship between Yield Degree and BIM

根据岩样应力-应变曲线特征,提出屈服度概念,并通过对砂岩、石灰岩及泥岩三组试样的单轴压缩试验曲线分析,得出各试验曲线的屈服度和BIM。通过对各组试样参数的拟合分析,认为屈服度与BIM具有较好的指数函数关系,并参考基于BIM的冲击倾向性评价标准,建立了以屈服度为指标的冲击倾向性评价标准。总之,屈服度可作为一个判别冲击倾向性的指标参数,且易于通过峰前曲线获得。但屈服度与BIM的关系及其在冲击倾向性判断中的应用还需要进一步的研究。

The concept of yield degree is put forward according to the characteristics of the uniaxial compression stress-strain curves of rock specimens after the values of the yield degree and BIM were obtained through analyzing the uniaxial compression stress-strain curves of sandstone,limestone and mudstone specimens. The yield degree is supposed to have a good exponential function relation with BIM through fitting analysis the relationship between the yield degree and BIM of above three kinds of rock specimens. Bump proneness evaluation standard based on the yield degree was established referring to the evaluation standard based on BIM. Therefore,the yield degree can be used as a new index parameter to discriminate the bump proneness of rock specimens,and it is easy to be got using the stressstrain curve before the peak point. But further research is still needed to get more proper relationship between yield degree and BIM before its application in judgment of rock bump tendency.