• 论文
主办单位:煤炭科学研究总院有限公司、中国煤炭学会学术期刊工作委员会
循环荷载作用下冻结灰砂岩强度特征与弹性模量演化规律
  • Title

    Strength characteristics and elastic modulus evolution of frozen gray sandstone under cyclic loading

  • 作者

    李涛马永君刘波盛海龙贺鹏

  • Author

    LI Tao,MA Yongjun,LIU Bo,SHENG Hailong,HE Peng

  • 单位

    中国矿业大学(北京)力学与建筑工程学院

  • Organization
    School of Mechanics & Civil Engineering,China University of Mining & Technology (Beijing),Beijing  100083,China
  • 摘要

    针对典型中生代富水弱胶结地层中的灰砂岩,利用TDW-200冻土三轴试验机对冻结饱水灰砂岩进行常规三轴压缩试验和循环加卸载试验,分析不同围压条件下的强度特征,重点研究了循环加卸载作用下冻结灰砂岩弹性模量的演化规律。试验结果表明:循环加卸载时,在低围压下峰值强度有所增加,而在高围压下峰值强度有"弱化"的现象;冻结灰砂岩试样加卸载全过程中弹性模量的变化规律与加卸载路径变化趋势具有一致性;单个滞回环内,切线弹性模量随着偏应力水平的增加呈现出先增加后减小的趋势,同一偏应力水平下,切线模量随循环次数的增加也表现为先增加后减小趋势。

  • Abstract
    The triaxial compression test and cyclic loading test were carried out on frozen sandstone samples cut from weakly cemented water-rich Mesozoic gray sandstones using TDW-200 frozen soil triaxial test apparatus. The strength characteristics and the evolution rules of elastic modulus were studied based on the experimental results. The test re- sults show that while the peak strength increases under low confining pressure,it decreases under high confining pres- sure in cyclic loading test;during the whole process of cyclic loading,the tendency of elastic modulus is consistent with the path of cyclic loading;for each hysteretic loop,the tangent modulus increases first then decreases with the increase of deviatoric stress,it has the same tendency with the increase of cycle number when the deviatoric stress is the same.
  • 关键词

    灰砂岩冻结三轴压缩循环荷载弹性模量

  • KeyWords

    gray sandstone;frozen;triaxial compression;cyclic loading;elastic modulus

  • 基金项目(Foundation)
    国家自然科学基金青年科学基金资助项目(51508556);国家自然科学基金资助项目(41472259);越崎青年学者资助项目(800015z1166);
  • DOI
  • Citation
    LI Tao,MA Yongjun,LIU Bo,et al. Strength characteristics and elastic modulus evolution of frozen gray sandstone un- der cyclic loading[J]. Journal of China Coal Society,2018,43 (9):2438 - 2443.
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