双轴压缩下双裂隙类岩石材料破坏试验
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摘要
通过预制双裂类岩板试件进行双轴压缩破坏试验,分析了不同裂隙倾角和不同岩桥角度对岩体破坏模式的影响。试验结果表明:双轴压缩下双裂隙岩体应力—应变曲线呈现S型,试件裂纹历经闭合阶段、弹性变形阶段、裂纹的萌生和扩展(或试件局部变形)及应变软化阶段;不同的裂隙倾角以及岩桥倾角对试件的破坏模式以及岩桥贯通模式有较大影响;在相同裂隙倾角下,随着岩桥角度的增大,岩桥区域的贯通模式由剪切裂纹贯通模式向翼形裂纹和剪切裂纹的复合贯通模式,再向翼形裂纹贯通模式逐渐转化。
A large number of rock engineering practices show that the destabilization and destruction of rock mass is influenced by the distribution form of the crack and the surrounding stress condition. Results of the trial indicate that the stress strain curve of specimens containing two flaws is S-shaped under the biaxial compression; the process of cracks contains five stages: the closed stage, the elastic stage, crack initiation and propagation(or local deformation of the specimen), strain softening stage; flaw inclination angle and rock bridge liagament angle have great impact on the failure mode and crack coalescence mode. With the increase of the angle of the rock bridge but under the same rack dip angle, the coalescence mode is transformed from the shear crack mode to the compound mode of wing mode and the shear crack and finally turned into the wing crack mode.
A large number of rock engineering practices show that the destabilization and destruction of rock mass is influenced by the distribution form of the crack and the surrounding stress condition. Results of the trial indicate that the stress strain curve of specimens containing two flaws is S-shaped under the biaxial compression; the process of cracks contains five stages: the closed stage, the elastic stage, crack initiation and propagation(or local deformation of the specimen), strain softening stage; flaw inclination angle and rock bridge liagament angle have great impact on the failure mode and crack coalescence mode. With the increase of the angle of the rock bridge but under the same rack dip angle, the coalescence mode is transformed from the shear crack mode to the compound mode of wing mode and the shear crack and finally turned into the wing crack mode.
引文
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[3]赵延林,万文,王卫军,等.类岩石材料有序多裂纹体单轴压缩破断试验与翼形断裂数值模拟[J].岩土工程学报,2013,35(11):2 097–2 109.
[4]蒲成志,曹平,赵延林,等.单轴压缩下多裂隙类岩石材料强度试验与数值分析[J].岩土力学,2010,31(11):3 661–3 666.
[5]靳瑾,曹平,蒲成志.预制裂隙几何参数对类岩材料破坏模式及强度的影响[J].中南大学学报(自然科学版),2014,45(2):529–535.
[6]刘东燕,朱可善,范景伟.双向应力作用下X型断续节理岩体的强度特性研究[J].重庆建筑工程学院学报,1991,13(4):40–46.
[7]刘欣宇,刘爱华,李夕兵.充填柱状节理类岩石材料的试验研究[J].岩石力学与工程学报,2014,33(4):772–777.
[8]王敏.双轴压缩下预制裂隙类岩石材料破坏实验研究与数值分析[D].湘潭:湖南科技大学,2014.
[9]段艳平.双轴压缩下多裂纹体类岩石材料破坏试验与分形研究[D].湘潭:湖南科技大学,2016.
[10]陈新,廖志红,李德建.节理倾角及连通率对岩体强度、变形影响的单轴压缩试验研究[J].岩石力学与工程学报,2011,30(4):781–789.
[11]张波,李术才,杨学英,等.含交叉裂隙岩体相似材料试件力学性能单轴压缩试验[J].岩土力学,2012,33(12):3 674–3 679.