循环加卸载下灰岩力学特性试验研究

Experimental Test Mechanical Characteristics of Limestone under Cyclic Loading and Unloading

为了更好地了解灰岩在循环荷载作用下的力学特性,利用TAW-2000D微机控制电液伺服岩石三轴试验机对灰岩进行单轴循环加卸载试验,研究了灰岩在不同循环加卸载路径作用下的强度、变形特征及破坏模式。结果表明:不同循环加卸载路径对灰岩的抗压强度的影响是各不相同的,且首循环加载载荷大小对灰岩的峰值强度影响较大。

In order to understand the mechanical characteristics of limestone under cyclic loading better, the TAW-2000D computer control electro-hydraulic servo was used for the rock triaxial testing machine. The strength, deformation characteristics and damage evolution process were investigated based on the experiment of limestone samples under the different cyclic loading and unloading paths. The results show that： different cyclic loading and unloading paths have different influence on the compressive strength of limestone, and the first cyclic loading has a much greater influence on the peak strengyh of limestone.