岩石在峰值荷载变形条件下的松弛试验研究

进行了岩石在峰值荷载变形条件下的松弛试验及峰值荷载前的加卸载试验。试验表明：岩石在峰值荷载变形条件下的应力松驰曲线呈阶梯式下降特征，说明岩石在峰值荷载变形条件下的应力松弛是间断的和阵发式的，其原因是岩石内部破裂面相互滑动、裂纹扩展和新裂隙产生的综合作用；岩石结构的完整性和岩石弹性能量储存能力强弱对岩石的松驰特性具有明显影响，因这些因素不同，则应力下降台阶数及松驰时间也不同。

Experiment study on properties of stress relaxation of rock under deformation at peak load

The stress relaxation experiments of rocks under the deformation at peak load and load-unload experiments before peak load are carried out. The results of experiments show that the form of the relaxation curves of rocks under the deformation at peak load descends in step form; the stress relaxation of rock under the deformation at peak load is discontinuous, that is, alternant between quickly and slowly, which is the resut of the synthetic action of slip and extension of existing cracks and creation of new cracks; and integrality of rock structure and the performance of store of elastic deformation energy of rock have obvious influence on the number of stress descending steps and stress relaxation time.