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通过对含预制椭圆形孔洞板状砂岩试样进行单轴压缩试验,研究了椭圆长轴与短轴之比k及石膏充填作用对岩样强度和破坏特征的影响规律.研究表明,含孔洞岩样的强度和变形参数相对于完整试样均有不同程度的降低,而石膏充填后试样的峰值强度和弹性模量均有所提高,但峰值应变无明显变化规律;无论充填与否,试样峰值强度均随着k值的增加均呈指数形式降低;充填作用对岩样宏观破坏模式无明显影响,岩样最终均以剪切破坏为主,主破裂面沿对角线分布;相对于无充填的岩样,石膏充填后的岩样破坏时宏观裂隙数目增多,破坏程度加剧.
Through the uniaxial compression test of plate-shaped sandstone samples with prefabricated elliptical holes, the influence of the ratio of the major axis to the minor axis of oval k and the effect of gypsum filling on the strength and failure characteristics of the rock samples was studied. Compared with the intact sample, the strength and deformation parameters decreased to some extent. However, the peak strength and elastic modulus of the sample after gypsum filling increased but the peak strain did not change obviously. Whether the filling or not, Both peak and peak values decrease exponentially with the increase of k value. The filling effect has no obvious effect on the macroscopic failure mode of rock samples. Ultimately, the rock samples are mainly subjected to shear failure and the main fracture surfaces are distributed diagonally. Without filling of rock samples, gypsum after filling the rock sample damage increased the number of macro-cracks, the degree of destruction worsened.