东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2016, Vol. 37 ›› Issue (11): 1630-1634.DOI: 10.12068/j.issn.1005-3026.2016.11.023

• 资源与土木工程 • 上一篇    下一篇

单轴压缩下高含石量胶凝堆石料的力学特性

张宇宁1， 陈宇龙2   

  1. (1. 重庆大学 煤矿灾害动力学与控制国家重点实验室， 重庆400030； 2. 东京大学 土木工程系， 日本 东京113-8656)
  • 收稿日期:2015-11-07 修回日期:2015-11-07 出版日期:2016-11-15 发布日期:2016-11-18
  • 通讯作者: 张宇宁
  • 作者简介:张宇宁(1988-)，男， 陕西延安人， 重庆大学博士研究生.
  • 基金资助:
    国家自然科学基金资助项目(10772205).

Mechanical Characteristics of Cemented Rockfill Materials with High Rock Block Proportions Under Uniaxial Compression

ZHANG Yu-ning1， CHEN Yu-long2   

  1. 1. State Key Laboratory of Coal Mine Disaster Dynamics and Control， Chongqing University， Chongqing 400030， China; 2. Department of Civil Engineering， University of Tokyo， Tokyo 113-8656， Japan.
  • Received:2015-11-07 Revised:2015-11-07 Online:2016-11-15 Published:2016-11-18
  • Contact: ZHANG Yu-ning
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摘要： 通过高含石量(70%， 80%， 90%)的不同尺寸的胶凝堆石料重塑样的单轴压缩试验，研究了含石量和尺寸效应对破坏形态和力学特性的影响.并结合数值模拟解释了试验现象.结果表明: 随着含石量的升高，压应力区与拉应力区相互交错分布，最终破坏时，受张拉破坏和剪切破坏共同作用.破坏形式从张拉劈裂破坏的一条曲折延伸的裂纹，逐渐转变为多条裂纹的剪切-张拉复合破坏模式，并伴随着局部区域颗粒的崩落.尺寸效应对重塑样的破坏形态影响不明显，而对力学性质有显著的影响，大尺寸试样的力学性质较差.

关键词: 胶凝堆石料, 高含石量, 单轴压缩, 尺寸效应

Abstract: Artificial specimens of cemented rockfill materials with high rock block proportions (70%， 80%， 90%) were fabricated for uniaxial compression to understand the effects of rock block proportion and size effect on the failure modes and mechanical characteristics. The observed experimental phenomena were explained by numerical simulation. Results show that with the increase of rock block proportion， zones of both tensile stress and compressive stress develop as staggered distribution so that failure mode is dependent on the splitting failure and the shear failure. Increasing rock block proportion changes a tortuous failure surface contributed by splitting failure to multiple failure surfaces and detachment of rock particles along the periphery of specimens to form the compound failure mode combining splitting failure and shear failure. The size effect does not play any role in failure modes， but do play prominent role in mechanical characteristics. Mechanical properties of bigger samples are worse than those of smaller samples.

Key words: cemented rockfill materials, high rock block proportion, uniaxial compression, size effect

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