逐级加载条件下岩石蠕变特性研究

Study on the Creep Property of Rock Under Stepwise Loading

蠕变是应力不变时,变形随时间增加而增长的现象。对矿区不同深度岩石试件进行了不同应力水平单轴逐级加载条件下的蠕变实验,实验结果表明:在低应力水平时,岩石蠕变应变一般很小,随着应力的增大,轴向蠕变有缓慢增大的趋势;随着深度的增大,即矿床由浅到深部,岩石蠕变应变增量和蠕变应变增加率大致呈增加的趋势;随着深度的增加,岩石的蠕变变形性有逐渐增强的趋势。

Creep is a phenomenon that the deformation increases with time under constantstress.The creep tests of rock samples in different depths were carried out under the uniaxial stepwise loading with different stress levels.The experimental results showed that the creep strain of rock under low stress level was small,and the axial creep had a slowly increasing trend with the improvement of stress.Along with the extension of depth,namely the deposit from shallow to deep,the creep strain increment and the strain rate of rock presented an increasing trend roughly,and the creep deformation had an intensive trend.