干湿循环作用下红页岩静态力学特性研究
Study on static mechanical properties of red shale under dry-wet circulation

为研究干湿循环作用下红页岩的静态力学特性，利用INSTRON1346伺服控制刚性试验机和PCI-2声发射仪对不同干湿循环次数下的红页岩进行单轴压缩试验。研究结果表明：干湿循环条件下红页岩试样的应力-应变曲线可分为微裂隙压密阶段、弹性变形阶段、塑性变形阶段以及破坏阶段4个阶段。干湿循环1次后，岩样单轴抗压强度和弹性模量显著降低，而后随着干湿循环次数的增加而逐渐趋于稳定，声发射累计能量和累计振铃计数均大幅下降，循环次数越多，声发射累计能量和累计振铃计数越小，试件破坏形式由弹脆性向弹塑性过渡。
In order to study the static mechanical properties of red shale under dry-wet cycles, the uniaxial compression test of red shale with different dry-wet cycles was carried out by INSTRON1346 servo-controlled stiff testing machine and PCI-2 acoustic emission instrument. The experimental results show that the stress-strain curve of the red shale specimen can be divided into four stages: the micro-crack compaction stage; the elastic deformation stage; the plastic deformation stage; the destruction stage. After one dry-wet cycle, the uniaxial compressive strength and the elastic modulus E of the specimen decreased significantly, and then it was gradually stabilized with the increasing dry-wet cycles. The acoustic emission (AE) cumulative energy and AE cumulative ringing count decreased significantly. The more cycles of the specimen are subjected to, the smaller the accumulated energy and accumulated ringing counts will be. The failure mode of the specimen is transformed from elastic-brittle to elastic-plastic status