【摘要】 采用 MTS815.03 电液伺服岩石试验系统对三种强度的砂岩进行全应力-应变试验研究,得出试验曲线呈明显的分段特征,曲线的离散性发生于应变软化阶段。通过对试验数据序列的混沌动力学分析得出:随着单向抗压强度的增加,砂岩全应力-应变过程的系统状态由强混沌态逐渐演化到低混沌态,进而质变为较有序的定常态;砂岩峰后应力-应变阶段曲线的线性性质增强,裂隙系统状态由强混沌态向强有序的定常态演化;砂岩峰前阶段的裂隙系统基本呈现弱混沌状态。该试验方法可靠,对砂岩强度阶段特征的混沌分析具有一定的理论意义。更多还原

【Abstract】 Analyzing records of sandstone strength from rock material test system, this paper finds that whole curves of strain-stress of three typical sandstone specimens have common features of stages, and the discrete feature of curve is often in strain-softening stage. After data series of test being detected by dynamics of chaos, it presents that system of whole process of strain-stress evolutes from high chaos state to low chaos state even ordered steady state, system after compressive strength which curve of strain-stress is more linear one by one changes from strong chaos state to strong ordered steady state; and joint system of sandstone before compressive strength normally generates weak chaos state, with increase of uniaxial compressive strength of sandstone specimens. Method of rock mechanics test is reliable. That dynamics of chaos used to study features of different stages of sandstone strength has some theoretic value.更多还原