院报 ›› 2012, Vol. 29 ›› Issue (8): 100-105.DOI: 10.3969/j.issn.1001-5485.2012.08.019

• 岩石力学与工程试验及测试技术专辑 • 上一篇    下一篇

排土场级配规律及其对稳定性影响的模型试验研究

任 伟a,b，李小春a,b，汪海滨a,b，石 露a,b   

  1. 中国科学院 a.武汉岩土力学研究所; b.岩石力学与工程国家重点实验室，武汉 430071
  • 收稿日期:2012-05-22 出版日期:2012-08-01 发布日期:2012-08-22
  • 作者简介:任伟(1985-)，男，湖北武汉人，博士，主要从事排土场结构及稳定性研究工作
  • 基金资助:

    国家自然科学基金（41002116）

Model Test on the Discipline of Waste Dump Gradation and Its Impact on the Stability

REN Wei1,2, LI Xiao-chun1,2, WANG Hai-bin1,2, SHI Lu1,2   

  1. 1.Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;
    2.State Key Laboratory of Geomechanics and Geotechnical Engineering, Chinese Academy of Sciences, Wuhan 430071, China
  • Received:2012-05-22 Online:2012-08-01 Published:2012-08-22

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摘要： 排土场的扩容和增高衍生出了一系列地质灾害现象。级配是排土料最重要的物理性质，决定了排土料的力学强度，但排土场内部级配很难调查清楚，因此揭示堆排过程中的级配规律非常重要。设计了一套进行排土场模型试验的装置，利用4组粒径分别为0.0075，0.02，0.1~0.2，0.8~1.0cm的材料，模拟排土料倾倒时的自然分选过程，并对形成的排土料分区进行筛选统计。试验结果表明：排土料模型试验体现了现场排土中出现的运动分异现象；在高度方向上，第1—3组含量随高度的降低而降低，第4组含量随高度降低而增加；在水平方向上，第1和2组越靠近排土场内部含量越低，第3组在水平方向上分布无明显规律，第4组越靠近土场内部含量越高。此外，按分区模型计算所得安全系数要明显小于水平分层的模型。研究成果可以为现场划分筛分高度提供指导，用最少的测点取得尽可能准确的级配数据，且分区模型能够更好地反应排土场整体性质。

关键词: 排土场, 模型试验, 级配, 分区, 稳定性

Abstract: Capacity expansion and height growth of waste dump, leaded by rise of land price, have brought about geological hazards. Gradation, as the most important physical property of dump material, determines the mechanical strength of dump material and yet can hardly be investigated clearly. Therefore, revealing the disciplines of gradation is of great importance. A device for waste dump model test has been developed. Four groups of material with grain size of 0.0075 cm, 0.02 cm, 0.1-0.2 cm and 0.8-1.0 cm respectively was used to simulate the natural separation in dumping process. Then, the gradation of the dump material was analyzed by partitions. The results demonstrated that dynamic differentiation existed in the dumping process. In the vertical direction, the content of group 1 to group 3 decreased with height reduction, while the content of group 4 increased; in the horizontal direction, the content of group 1 and 2 decreased from the exterior to the inner slope, whereas the content of group 4 was on the contrary, and the content of group 3 was irregular. Besides, The FOS (factor of safety) of dump material based on the zonal model was obviously smaller than that on layered model. The results can provide a guidance for the determination of in-situ partition height to get an accurate gradation distribution with the least sampling points. In addition, the zonal model is more suitable to represent the property of the waste dump. 

Key words: waste dump, model test, gradation, partition, stability

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