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利用MTS815岩石伺服试验机对不同含水状态下的砂岩进行了三轴压缩声发射试验,得到自然状态及饱水状态下砂岩的应力-应变曲线、声发射振铃计数率、能量及振幅分布曲线。试验结果表明,在水的影响下砂岩的力学特性和声发射特征都有较大变化:饱水状态岩样的平均峰值强度为自然状态岩样的84.4%,且在试验过程中整体变形及弹性模量都较小;在岩样三轴压缩的各个阶段,饱水岩样的声发射振铃计数率、能量及振幅值均比自然状态岩样小;对比饱水岩样和自然岩样的宏观破裂时间及声发射信号最大值出现的时间,饱水状态岩样都存在“滞后”现象;此外,两种含水状态下岩样的声发射振铃计数及能量出现最大值的时间均稍“滞后”于砂岩宏观破坏时刻。研究结果对含水岩层工程设计及施工具有指导意义。
The MTS815 rock servo test machine was used to test the triaxial compression acoustic emission of sandstone under different water conditions. The stress-strain curve, acoustic ringing counting rate, energy and amplitude distribution curve of sandstone under natural state and saturated state were obtained. The experimental results show that under the influence of water, the mechanical properties and acoustic emission characteristics of sandstone have great changes: the average peak strength of saturated rock samples is 84.4% of the natural rock samples, and the overall deformation and elasticity during the test In all stages of triaxial compression of rock samples, the count rate, energy and amplitude of acoustic emission of saturated rock samples are smaller than that of natural rock samples. Compared with saturated rock samples and natural rock samples The time of macroscopic rupture and the time of appearance of the maximum acoustic emission signal are all “lagged” in the saturated rock samples. In addition, the ringing counting and the maximum energy generation time of the acoustic emission rock samples under the two water-containing conditions Slightly “lag” moment of macro damage in sandstone. The results of this study are instructive for the design and construction of aquifer engineering.