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不同围压下断续预制裂纹粗晶大理岩变形和强度特性的试验研究

期刊名称：岩石力学与工程学报
时间：0
页码：1572-1587
语言：中文
分类：TU458[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]河海大学岩土工程研究所,江苏南京210098, [2]河海大学水利水电工程学院,江苏南京210098
相关基金：国家自然科学基金重点项目（50539110）;中国博士后基金项目（20060400909）;江苏省博士后科研资助计划项目（0601036B）致谢本文岩样在加工过程中得到了河南理工大学能源科学与工程学院苏承东高级工程师以及中国科学院武汉岩土力学研究所戴永浩博士的热心帮助,在岩样试验过程中得到了中国矿业大学岩控中心李玉寿高级工程师的大力支持,特此致谢!
相关项目：断续预制裂纹岩石三轴流变力学特性的试验与模型研究

关键词：岩石力学, 预制裂纹, 粗晶大理岩, 变形特性, 强度特性, rock mechanics, pre-existing crack, coarse marble, deformation property, strength property

中文摘要：

通过在MTS815.03岩石力学伺服试验机上对断续预制裂纹粗晶大理岩进行常规三轴压缩试验,基于试验结果研究不同围压下断续预制裂纹粗晶大理岩的变形和强度特性.结果表明,随着围压的增加,完整岩样和断续预制裂纹岩样峰后表现从应变软化逐渐转化为理想塑性的变形特性;岩石峰值环向应变对围压的敏感程度高于峰值轴向应变;强度与围压之间的关系可采用Coulomb准则来表征,且残余强度对围压的敏感性显著高于峰值强度.粗晶大理岩晶粒尺度较大,完整岩样的杨氏模量随围压而增大,峰值应变与围压之间成正线性关系;而断续预制裂纹岩样的杨氏模量以及峰值应变和围压之间的关系较为复杂,且随裂纹倾角而变化.单轴压缩时,断续预制裂纹岩样峰值强度与裂纹倾角密切相关,其最大轴向承载能力取决于两条预制裂纹内部顶端的扩展模式以及晶粒间的摩擦滑移;较低围压（σ3≤10 MPa）时,与完整岩样的峰值强度相比,断续预制裂纹岩样的峰值强度明显偏低,但残余强度相差不大;而较高围压（σ3＞10 MPa）时,岩样进入塑性流动阶段后,完整岩样和预制裂纹岩样的三轴强度（峰值强度和残余强度）相差很小,粗晶大理岩样的轴向承载极限与预制裂纹分布关系不大,晶粒间的摩擦承载决定粗晶大理岩的强度特性.

英文摘要：

Experiments were carried out to study coarse marble with discontinuous pre-existing cracks under conventional triaxial compression by the MTS815.03 rock mechanics servo-controlled testing machine. Based on the experimental results, the deformation and strength properties of coarse marble with discontinuous pre-existing cracks under different confining pressures were investigated. The results show that the deformation of intact rock specimens and marble with discontinuous pre-existing cracks after peak strength changes from strain softening into ideal plasticity. The sensitivity of peak circumferential strain to the confining pressure is higher than that of peak axial strain. The relation between strength and confining pressure can be expressed by Coulomb criterion; what＇s more, the sensitivity of residual strength to the confining pressure is higher than that of peak strength. The coarse marble has greater crystal in size of 4 - 6 mm. The Young＇s modulus of intact rock specimen increases with theconfining pressure; and the peak strain has a positive linear relation with the confining pressure. However, the Young＇s modulus and the peak strain of rock specimen with discontinuous pre-existing cracks have more complex relations with the confining pressure and vary with the crack angles. In uniaxial compression, the peak strength of rock specimen with discontinuous pre-existing cracks has a close relation with the crack angles; and the maximal axial stress depends on the fracture modes between the inner tip of two pre-existing cracks and friction slips between crystals. Under lower confining pressure（σ3〈 10 MPa）, the triaxial peak strength of rock specimens with discontinuous pre-existing cracks is lower than that of intact rock specimens; but for triaxial residual strength, there are no great differences between intact coarse marble and marble with discontinuous pre-existing cracks. However, under higher confining pressure（σ 3〉 10 MPa）, the triaxial strengths（peak strength and residual strength?

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