CAJ | 학술논문

为了更附合巷道围岩吸水的实际状态，通过对两组单面吸水后的砂岩试件进行单轴抗压强度实验，研究其随吸水时间变化的强度软化特征。结果表明：两组试件单轴压缩σ-ε曲线线形相似，属于塑性-弹性-塑性变形类型，试件抗压强度随吸水时间呈负指数衰减趋于饱水强度，强度软化系数与吸水时间呈负相关性。试件宏观破坏形式主要为楔劈型张剪破坏和拉伸破坏，而且吸水一端总是首先破坏。砂岩在单面吸水状态下，强度软化机制为黏土矿物遇水膨胀机制与微观力学机制。
위료경부합항도위암흡수적실제상태，통과대량조단면흡수후적사암시건진행단축항압강도실험，연구기수흡수시간변화적강도연화특정。결과표명：량조시건단축압축σ-ε곡선선형상사，속우소성-탄성-소성변형류형，시건항압강도수흡수시간정부지수쇠감추우포수강도，강도연화계수여흡수시간정부상관성。시건굉관파배형식주요위설벽형장전파배화랍신파배，이차흡수일단총시수선파배。사암재단면흡수상태하，강도연화궤제위점토광물우수팽창궤제여미관역학궤제。
Aimed at a greater conformity with the actual state of roadway surrounding rock water up- take, this paper introduces uniaxial compressive strength test of the two groups of sandstone specimens, which absorb water only on single side to obtain the softening characteristic varying with absorption time. The result shows that the two groups of speciments have the much similar σ-ε compressed curve, classified into plastical-elastical-plastical deformatoin type. The compressive strength for both specimens tend to the saturable strength with negative exponentially proportional to the absorption time, softening coefficient of compressive strength shows negative correlation to the absorption time. The mainly macroscopic crack for the specimens occur in the form of wedge-splitting and tensile failure, and the first cracking is always at absorbing side. It follows that the strength softening mechanism for the single-side absorpting sandstone could be described as absorption expansion mechanism and micromeehanics mechanism.