不同材料组合及配比下类岩石试件单轴压缩损伤破坏过程分析

doi:10.13722/j.cnki.jrme.2022.0303

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Abstract Due to the difficulty of obtaining large size real cores in the well and the limited number，the analog method is usually used to make rock-like material specimens in the laboratory to simulate the actual coal rock，so as to carry out the hydraulic fracturing test. In order to accurately explore the mechanical properties of rock-like material specimens，cement，quartz sand，plaster，and coal powder were used as raw materials to cast specimens with different combinations and ratios. Through uniaxial compression test to explore the effects of cement-plaster ratio，sand-binder ratio and coal powder on the mechanical properties and destruction form of the specimens. The results show that the compressive strength of cement-quartz sand-plaster specimen increases with the increase of cement-plaster ratio，and decreases with the increase of sand-binder ratio；The sand-binder ratio has a more significant effect on the compressive strength of the specimen. When the sand-binder ratio and the cement-plaster ratio are 0.33，0.75，1 and 0.5，1，and 2，respectively，the specimen compressive strength decreases from 23.19 MPa to 19.14 MPa；The peak failure time of the same type of rock-like material specimens is advanced with the increase of the cement-plaster ratio，and the internal damage degree of the specimen intensifies. The cement-plaster ratio increases from 0.5 to 2，and the acoustic emission ringing count increases by about 5.1 times，macroscopically，it is manifested as increased cracks in the specimen，Compared with quartz sand and plaster，Coal powder will aggravate the development of cracks in the specimen and weaken its mechanical properties，so as to ensure that the ratio remains unchanged，and replacing quartz sand and plaster in cement-quartz sand-plaster specimens with coal powder，the maximum acoustic emission ringing count of the specimen at peak failure is 1.5 times and 2 times that before replacement，respectively，and the surface changes from more regular cracks to more developed through cracks；After the specimen is damaged，the cracks are distributed in reverse arches on both sides of the specimen surface，which is the X-shaped conjugate inclined plane shear failure，and the maximum principal strain is located at the crack of the specimen，which the cracks on the surface of the specimen are basically consistent with the phenomenon described by the acoustic emission monitoring data.

Key words： rock mechanics rock-like material uniaxial compression acoustic emission full field strain measurement system fissure expansion destruction form

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0303 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS1/3377

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