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饱水与干燥状态下横观各向同性板岩蠕变特性
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Creep Properties of Transversely Isotropic Slate under Water-saturated and Dry Conditions
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    摘要:

    为研究水对横观各向同性板岩蠕变特性的影响,采用RYL-600微机控制岩石流变仪,以分级增量加载方式对饱水与干燥状态下具有横观各向同性特性的板岩进行蠕变试验. 试验结果表明:饱水板岩试样和干燥板岩试样在蠕变试验中均出现瞬时弹性变形阶段、初始蠕变阶段、等速蠕变阶段及短暂的加速蠕变阶段. 在相同加载条件下,饱水板岩试样的瞬时弹性模量小于干燥板岩试样的瞬时弹性模量. 低应力状态下,饱水及干燥试样的蠕变速率都稳定,且相差不大;在高应力状态下,两种情况的蠕变速率都随载荷的增加而快速增长,且相差较大. 饱水试样的破坏应力小于干燥试样的破坏应力,且随着层理角的增加都呈U形分布.

    Abstract:

    In order to study the effect of saturation on the creep characteristics of transversely isotropic rock, creep experiments were conducted on transversely isotropic slate under saturated and dry state employing the RYL-600 microcomputer control rock rheometer by means of hierarchical incremental loading method. Some conclusions are drawn from these experiments as follows: There are four deformation stages, i.e., instantaneous elastic deformation stage, initial creep stage, constant creep stage and accelerated creep stage, under water-saturated and dry conditions. The instantaneous elastic modulus of water-saturated slate samples is less than that of dry samples under the same loading condition. Creep rate is steady, and there is no remarkable difference of the creep rate between water-saturated and the dry at low stress level. However, creep rate increases rapidly with the increasing load, and there is the opposite situation in two cases at high stress state level. The failure stress of water-saturated slate specimen is less than that of dry slate samples, and failure stress curves both present U-shape with the increase of bedding angle.

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李江腾,常瑞芹,黄旻鹏.饱水与干燥状态下横观各向同性板岩蠕变特性[J].湖南大学学报:自然科学版,2018,45(5):143~148

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  • 在线发布日期: 2018-05-31
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