›› 2016, Vol. 37 ›› Issue (4): 957-964.doi: 10.16285/j.rsm.2016.04.007

• 基础理论与实验研究 • 上一篇    下一篇

尾矿坝筑坝模袋力学性能试验研究

李巧燕1, 2,王惠栋1,马国伟1, 3,李之建1,周汉民4,崔 旋4   

  1. 1. 北京工业大学 建筑工程学院,北京 100022;2. 防灾科技学院,河北 廊坊 065201;3. 西澳大学,西澳大利亚 珀斯 6009; 4. 北京矿冶研究总院 矿山工程研究设计所,北京 100070
  • 收稿日期:2014-09-11 出版日期:2016-04-11 发布日期:2018-06-09
  • 通讯作者: 马国伟,男,1968年生,博士,教授,主要从事岩石力学与工程、不连续变形分析与计算等方面的研究工作。E-mail: guowei.ma@uwa.edu.au E-mail:yan20040369@126.com
  • 作者简介:李巧燕,女,1980年生,博士研究生,讲师,主要从事矿业工程和岩土力学方面的教学与科研工作
  • 基金资助:

    国家自然科学基金面上项目(No. 51178012);国家自然科学基金青年项目(No. 51408127);中央高校基本科研业务费专项资金(创新项目团队资助计划)(No. ZY20120103);河北省高等学校科学研究计划项目(No. QN2015327)。

An experimental study of the mechanical performance of tailings dam geofabriform

LI Qiao-yan1, 2,WANG Hui-dong1,MA Guo-wei1, 3,LI Zhi-jian1,ZHOU Han-min4,CUI Xuan4   

  1. 1. College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100022, China; 2. Institute of Disaster Prevention, Langfang, Hebei 065201, China; 3. The University of Western Australia, Perth, Western Australia 6009, Australia; 4. Institute of Mining Engineering, Beijing General Research Institute of Mining and Metallurgy, Beijing 100070, China
  • Received:2014-09-11 Online:2016-04-11 Published:2018-06-09
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (NSFC) (51178012 and 51408127) and Special Fund of Fundamental Scientific Research Business Expense for Higher School of Central Government (Projects for Creation Teams) (ZY20120103) and Scientific Research Plan Projects for Higher Schools in Hebei Province (QN2015327).

摘要: 模袋法是解决上游法细粒尾矿堆坝难的一种新方法。为研究模袋法尾矿坝筑坝模袋的基本力学性能,采用与云南省某尾矿坝施工现场一样的土工布和尾砂,通过斜坡滑移、直剪、无侧限压缩试验,对固结不同时间的小尺寸尾矿坝筑坝模袋进行了摩擦和受压性能的试验研究。斜坡滑移试验表明,若含水率相对较低,则模袋间的摩擦系数较大;直剪试验测得固结8 d的模袋间内摩擦角约为28º,黏聚力约为40 kPa;在无侧限压缩条件下,固结1 d和3 d的模袋在受压过程中,其弹性模量都表现为“大-小-大”的变化形式。由于土工布和尾砂的共同作用,模袋的极限抗压强度远大于单纯尾砂堆积体的极限抗压强度。当压应力达到模袋所能承受的极限荷载时,通常会在模袋底部靠近模袋边缘处发生土工布的撕裂破坏,采用主动土压力理论分析了发生破坏的原因。本试验研究可以为模袋法尾矿坝的实践提供理论指导。

关键词: 斜坡滑移试验, 直剪试验, 无侧限压缩试验, 尾矿坝筑坝模袋, 摩擦系数, 极限抗压强度

Abstract: Geofabriform method is a new method for constructing fine-grained tailings dam construction. To study the basic mechanical performance of tailings dam geofabriform, the frictional and compressive properties of small-scale tailings dam geofabriform are investigated by means of slope sliding test, direct shear test and unconfined compression test. The tailings dam geofabriform is made of geotextile and tailings sand, which both come from a construction site in Yunnan province. The slope sliding test of geofabriform shows that the coefficient of friction between the geofabriforms is larger when the moisture content of the geofabriform is lower. The internal friction angle and cohesion of the geofabriform consolidated for 8 days are around 28º and 40kPa respectively, based on the direct shear test. Under the unconfined compression condition, with the compression of the geofabriform consolidated for 1 day and 3 days, the tangent elastic modulus increases first, then decrease and finally increase again. Due to the combined effect of geotextile and tailings sand, the ultimate compressive strength of the geofabriform is much larger than that of the pure tailings sand. When compressive stress reaches the ultimate compressive strength of the tailings dam geofabriform, geotextile tearing often occurs at the bottom and close to the edge of the geofabriform, The failure mode is analyzed using the active earth pressure theory.

Key words: slope sliding test, direct shear test, unconfined compression test, tailings dam geofabriform, coefficient of friction, ultimate compressive strength

中图分类号: 

  • TU 452

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