中间主应力对岩体力学特性影响的试验研究

Test and Study on Influence of Intermediate Main Stress to Characteristic of Rock Mechanics

采用LY-C拉压真三轴仪对完整岩体和节理岩体模型进行了试验研究,结果表明,σ1随着中间主应力的增大有所提高。在中间主应力较低时,岩石呈现出延性,但随着中间主应力的增加,岩石特征向脆性转变。岩石破坏不仅取决于应力差(σ1-σ3),而且与中间主应力关系密切。主应力方向对节理岩体的极限强度有较大影响。

It conducts test and study on complete rock and joint rock model by using LY-C tension-pressure real triaxial apparatus.The outcomes show that σ1 increases along with the increase of intermediate main stress.When the intermediate main stress is lower,the rock shows ductility and the rock characteristic turns to brittleness along with the increase of intermediate main stress.The breakdown of rock does not only depend on stress difference(σ1-σ3),it is also closely related with intermediate main stress.The direction of main stress has greater effect to the ultimate strength of joint rock.