干湿循环条件下砂岩强度劣化试验研究

Sandstone Strength Degradation Experiments under the Condition of Dry-wet Circulation

通过砂岩的单轴压缩试验,研究不同干湿循环作用下砂岩强度劣化规律。试验结果表明,随着干湿循环次数的增加,砂岩峰值强度呈指数关系降低。即干湿循环作用下砂岩强度劣化是一个内部基质结构损伤累积、扩展直至破坏的渐进性过程,可通过劣化度定量描述。研究成果将为遭受干湿循环作用的工程体的短期和长期稳定性安全评价提供有益的依据。

Through the uniaxial compression test of sandstone,the strength degradation rule of sandstone under differ- ent dry-wet circulation is studied. The test results show that with the increase of dry-wet cycles, the peak intensity of sand- stone decrease by exponential relationship,i, e sandstone strength degradation under dry-wet circulation is a progressive deg- radation with internal structure damage accumulation, extension until destruction. The research results provide a beneficial basis for short term and long term stability and safety evaluation of the engineering under dry-wet circulation condition.