土工基础

›› 2013, Vol. 27 ›› Issue (6): 131-133.

• 工程实录 • 上一篇    下一篇

循环荷载作用下岩石疲劳变形及特性试验研究

韩 犇,刘 平   

  1. (湖北楚维工程咨询监理公司,湖北荆门 448124)
  • 收稿日期:2013-03-28 出版日期:2013-12-20 发布日期:2013-12-21
  • 作者简介:韩犇（1969-），男，高级工程师，研究方向为路桥工程施工管理。

Experimental Study of the Fatigue Deformation of Rock Samples under Cyclic Loadings

HAN Ben, LIU Ping   

  1. （Hubei Chuwei Engineering Consultation and Supervision Co., Jingmen Hubei 448124）
  • Received:2013-03-28 Online:2013-12-20 Published:2013-12-21

摘要： 通过开展恒定加卸载速率，不同偏应力条件下的循环加卸载试验，研究了轴向应变、径向应变以及体积应该随循环次数的演化过程，得到了在不同偏应力条件下岩石的平均变形模量随循环次数与偏应力的变化关系，进而分析了循环荷载作用下岩石疲劳变形及特性。研究结果表明：(1)偏应力在50MPa之前，轴向应变、径向应变、体积应变以及变形模量随着循环次数的变化基本稳定，反之，表现出发散的趋势；(2)偏应力在80MPa作用下的平均变形模量较110MPa作用下的大，这是岩石内部裂隙增加和扩张的结果；(3)在不同偏应力条件下，平均变形模量随着偏应力的增大逐渐增大且趋于收敛。

关键词: 岩石, 循环荷载, 应变, 变形模量, 试验研究

Abstract: A series of laboratory cyclic loading tests on rock samples with constant loading rates under different deviator stress levels are performed. The relationships among the axial strain, radial strain, bulk strain and cycle index under different deviator stress levels are evaluated. The characteristics of fatigue deformation of the rock samples subjected to cyclic loading are then analyzed. The results indicate that the axial strain, radial strain, bulk strain and deformation modulus remain constant with the increasing cycle index under the deviator stress of less than 50 MPa. A diverge tendency can be observed if the deviator stress is greater than 50 MPa. Due to the increasing in number and the dilation of cracks in the samples, the average deformation modulus under a deviator stress of 80MPa is larger than the one under 110MPa. Under different deviator stress, the average deformation modulus will reduce with the increase of the deviator stress.

Key words: Rock Samples, Cyclic Loading Condition, Rock Strain, Deformation Modulus, Laboratory Tests