岩土力学 ›› 2019, Vol. 40 ›› Issue (6): 2303-2310.doi: 10.16285/j.rsm.2018.0352

• 基础理论与实验研究 • 上一篇    下一篇

基质吸力对非饱和离子型稀土抗剪强度的影响

洪本根1,罗嗣海2,胡世丽2,王观石2,姚 康2   

  1. 1. 江西理工大学 资源与环境工程学院,江西 赣州 341000;2. 江西理工大学 建筑与测绘工程学院,江西 赣州 341000
  • 收稿日期:2018-03-01 出版日期:2019-06-11 发布日期:2019-06-22
  • 通讯作者: 胡世丽,女,1976年生,博士,副教授,主要从事土力学方面的研究工作。E-mail: hslqhd@163.com E-mail:hbghbcxyq@163.com
  • 作者简介:洪本根,男,1991年生,博士研究生,主要从事渗流力学方面的研究工作。
  • 基金资助:
    国家自然科学基金(No.41602311,No.51664015);江西省教育厅科技项目(No.GJJ150658);江西理工大学优秀博士学位论文培育项目(No.YB2017003)

Influence of matric suction on shear strength of unsaturated ion-absorbed rare earth

HONG Ben-gen1, LUO Si-hai2, HU Shi-li2, WANG Guan-shi2, YAO Kang2   

  1. 1. School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China; 2. School of Architectural and Surveying & Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China
  • Received:2018-03-01 Online:2019-06-11 Published:2019-06-22
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (41602311, 51664015), the Science and Technology Project of Jiangxi Educational Department(GJJ150658) and the Excellent Doctoral Dissertation Nurturing Project of Jiangxi University of Science and Technology(YB2017003).

摘要: 掌握基质吸力对非饱和离子型稀土抗剪强度的影响,对于认清水对矿体强度的弱化作用具有重要意义。现场测试了矿体的土?水特征曲线和抗剪强度,由此得到基质吸力对矿体抗剪强度的影响特性,即随着基质吸力的增大,矿体的内摩擦角略有增大,黏聚力大幅增大。同时,根据进气值所代表的物理意义进行分析可知,当基质吸力小于进气值时,基质吸力对抗剪强度的贡献速率可看成一稳定值;当基质吸力大于进气值时,基质吸力对抗剪强度的贡献速率逐渐减小。由此,以进气值为分界点,提出非饱和强度改进模型,通过改进模型计算得到的抗剪强度贡献值与现场实测值的误差绝对值基本在15%以内,且优于其他模型预测结果,表明本文的非饱和强度改进模型是有效的。

关键词: 非饱和离子型稀土, 基质吸力, 抗剪强度, 土?水特征曲线, 改进模型

Abstract: It is of great significance to understand the influence of matric suction on shear strength behavior of ion-absorbed rare earth unsaturated ore body. Hence, the weakening of the strength of the ore body caused by water can be recognized. The soil-water characteristic curve and shear strength of the ore body were measured in the field. The influence of matric suction on the shear strength of the ore body was obtained. As the matric suction increased, the inner friction angle of the ore body increased slightly, and the cohesive force increased greatly. According to the analysis of the physical meaning represented by the air entry value, we could see that when the matric suction was lower than the air entry value, the contribution rate of matric suction to shear strength could be regarded as a constant. When the matric suction was higher than the air entry value, the contribution rate of matric suction to shear strength decreased gradually. The improved model of unsaturated strength was proposed by taking the air entry value as the boundary point. The absolute error between the calculated value obtained by this model and the measured value was within 15%, and better than the other models prediction results

Key words: 1. School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China, 2. School of Architectural and Surveying & Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China

中图分类号: 

  • TU431
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