钙芒硝盐岩力学特性的研究

Study on Mechanical Property of Glauberite Salt Rock

通过基本的力学实验，得出钙芒硝盐岩这一特殊岩石类型的抗压强度为18．86MPa，抗拉强度为2．59MPa，实验发现钙芒硝盐岩是一种软岩，其破坏形式属于典型的柱状劈裂破坏，同时也说明盐岩在自然条件下是脆性材料。通过长时间的蠕变实验，回归出钙芒硝盐岩蠕变在不同应力水平下随时间变化的曲线，其抗压强度50％时的曲线方程为ε（t）=0．009t^0.3265，抗压强度80％时的蠕变曲线方程为ε（t）=0．0098ln（t）-0．0014，应力水平高时其蠕变速率高于低应力水平的蠕变速率。

The fundamental mechanical tests inchuding uniaxial compressive, indirect tensile and creep experiments were carried out. Test results show that the compressive strength of the rock is 18.86MPa, the tensile strength is 2.59MPa. It is found that the gtauberite salt rock is a kind of soft rock, and its failure is a typical column cleave, at the same time the result shows that the salt rock is a friable meterial in the nature. In the long time creep tests, by regressive analysis, the creep curve of glauberite at different stress level： The creep curve s obtained at 50% of compression strength is ε（t） = 0. 009t^0.3265, at 80% of compression strength, the creep curve is ε（t） = 0.0098ln（t） - 0.0014. It can be seen from the creep curves that the creep ratio of high stress level is higher than that of the lower stress level.