含预制椭圆形孔洞砂岩强度及破坏特征试验研究

发布时间：2018-04-25 15:36

本文选题：岩石力学 + 椭圆形孔洞　；参考：《中国矿业大学学报》2016年06期

【摘要】：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.
[Abstract]:Based on uniaxial compression tests of slate sandstone samples with prefabricated elliptical voids, the effects of the ratio k of elliptical long axis to short axis and the effect of gypsum filling on the strength and failure characteristics of rock samples are studied. The results show that the strength and deformation parameters of porous rock samples are lower than that of intact samples, but the peak strength and elastic modulus of gypsum filled samples are increased, but the peak strain has no obvious change. Whether filled or not, the peak strength of the specimen decreases exponentially with the increase of k value, and the filling has no obvious effect on the macroscopic failure mode of rock sample, and the main fracture surface is distributed diagonally. Compared with the unfilled rock samples, the number of macroscopic fractures increases and the degree of failure intensifies during the failure of gypsum filled rock samples.
【作者单位】：中国矿业大学深部岩土力学与地下工程国家重点实验室;
【基金】：国家重点基础研究发展计划(973)项目(2013CB036003) 国家自然科学基金项目(51374198,51134001)
【分类号】：TU45

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