CAJ | 학술논문

基于3种不同应力路径下花岗岩三轴卸荷试验，研究了岩石的应力-应变全过程曲线和变形特征及其强度准则。试验结果表明，卸围压过程中，侧向应变与围压先呈线性后呈非线性关系，且其增长速率约为轴向应变增长速率的3～5倍，表现出明显的侧向扩容，其扩容程度与卸载路径有关；从不同围压与体积应变曲线所围面积可以看出，卸荷前围压越大，卸荷释放的能量越大；变形模量随围压卸载而逐渐减小，且随初始围压增大，总体上呈负指数分布趋势，且同一种卸荷应力路径时，变形模量的减小量随初始围压增大有所增大，泊松比随围压降低而不断增大，两者之间呈现明显的非线性关系；岩石破坏特征以剪切破坏为主；采用幂函数型摩尔强度准则很好反应了岩石的强度特征。研究结果对地下金属矿深部开采具有一定的指导意义和参考价值。
기우3충불동응력로경하화강암삼축사하시험，연구료암석적응력-응변전과정곡선화변형특정급기강도준칙。시험결과표명，사위압과정중，측향응변여위압선정선성후정비선성관계，차기증장속솔약위축향응변증장속솔적3～5배，표현출명현적측향확용，기확용정도여사재로경유관；종불동위압여체적응변곡선소위면적가이간출，사하전위압월대，사하석방적능량월대；변형모량수위압사재이축점감소，차수초시위압증대，총체상정부지수분포추세，차동일충사하응력로경시，변형모량적감소량수초시위압증대유소증대，박송비수위압강저이불단증대，량자지간정현명현적비선성관계；암석파배특정이전절파배위주；채용멱함수형마이강도준칙흔호반응료암석적강도특정。연구결과대지하금속광심부개채구유일정적지도의의화삼고개치。
By carrying out triaxial unloading test under different stress paths on rock, the complete stress-strain curves, deformation characteristics and its strength criterion are studied. The test results show that the relation between lateral strain and confining pressure firstly is linear, and then is nonlinear in the total stage of unloading confining pressure. And its growth rate is about 3 to 5 times the growth rate of the axial strain. It shows obvious lateral dilatancy, and the degree of dilatancy is related to the unloading path. According to the area that is enclosed by confining pressure and volumetric strain curve, it can be seen that the greater the confining pressure is before unloading, the more the energy releases. Deformation modulus decreases gradually with the unloading confining pressure, and increases with the initial confining pressure;the relation between deformation modulus and confining pressure shows negative exponential distribution overall. At the same unloading paths, the reduction of the deformation modulus increases with the increase of initial confining pressure. The Poisson′s ratio rises up continually, and the variation law with the confining pressure can be well described by nonlinear. Failure characteristics of rock are mainly shear failure. The strength characteristics of rock can be well characterized by using the Mohr strength criterion of power function. These conclusions provide reliable theoretical reference and guiding significance for the deep mining of the underground metal mine.