[1]高 森,庄心善,林万峰,等. 不同条件下磷尾矿改良膨胀土的滞回曲线研究[J].湖北工业大学学报,2022,(2):90-93+109.
　GAO Sen,ZHUANG Xinshan,LIN Wanfeng,et al. Study on Hysteresis Curve of Phosphate Tailings Improved Expansive Soil under Different Conditions[J].,2022,(2):90-93+109.
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 不同条件下磷尾矿改良膨胀土的滞回曲线研究()
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《湖北工业大学学报》[ISSN:1003-4684/CN:42-1752/Z]

卷:
期数:
2022年第2期
页码:
90-93+109
栏目:
湖北工业大学学报
出版日期:
2022-04-29

文章信息/Info

Title:
 Study on Hysteresis Curve of Phosphate Tailings Improved  Expansive Soil under Different Conditions
文章编号:
1003-4684(2022)02-0090-04
作者:
 高 森;  庄心善;  林万峰;  寇 强
 湖北工业大学土木建筑与环境学院， 湖北 武汉 430068
Author(s):
 GAO Sen;  ZHUANG Xinshan;  LIN Wanfeng;  KOU Qiang
 School of Civil Engineering, Architecture and Environment, Hubei Univ. of Tech., Wuhan 430068, China
关键词:
 ; 磷尾矿;  膨胀土;  动三轴试验;  滞回曲线;  弹性性能
Keywords:
 ; phosphate tailings;  expansive soil;  dynamic Triaxial test;  hysteresis curve;  elastic properties
分类号:
TU43
文献标志码:
A
摘要:
 滞回曲线反应结构在反复受力过程中的变形特点、刚度变化及能量损耗，是确定应变回弹模型的基础。通过GDS动三轴试验，研究不同围压、加载频率、动应力幅值下磷尾矿改良膨胀土滞回曲线变化规律。采用滞回曲线中单个滞回圈面积S、滞回圈近似椭圆的长轴斜率k、滞回圈短轴与长轴之比α及单次循环的残余应变εp，结合循环荷载产生的应变进行定量研究。研究结果表明：膨胀土在循环荷载作用下的滞回曲线呈倾斜椭圆形，S和εp随动应变增大而增大，围压、频率增大使S和εp减小；k随围压、频率的增大而增大，而动应变的增加使k值减小；α随围压、频率的增大而减小。磷尾矿改良膨胀土较未改良膨胀土的S、α、εp值均增大，k值减小。
Abstract:
 The hysteresis curve reflects the deformation characteristics, stiffness changes and energy loss of the structure in the repeated stress process, which is the basis for determining the strain resilience model. Through the GDS dynamic triaxial test, the hysteresis curve of phosphate tailings modified expansive soil under different confining pressure, loading frequency and dynamic stress amplitude are studied. The area S of a single hysteresis loop in the hysteresis curve, the major axis slope k of the approximate ellipse of the hysteresis loop, the ratio of the minor axis to the major axis of the hysteresis loop α and the residual strainεp of a single cycle are used in combination with the strain generated by the cyclic load to conduct quantitative study. The research results show that the hysteresis curve of expansive soil under cyclic loading is inclined ellipse, S and ε p increase with the increase of dynamic strain, and the increase of confining pressure and frequency makes S and ε p decrease; k increases with confining pressure and frequency. And the increase of dynamic strain make the value of k decrease; α decreases with the increase of confining pressure and frequency. Compared with the unimproved expansive soil, the S , α , and ε p values of the phosphate tailings modified expansive soil increased, and the k value decreased.

参考文献/References:

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备注/Memo

备注/Memo:
［收稿日期］ 2021-04-27
［基金项目］ 国家自然科学基金项目（51708190）
［第一作者］ 高 森（1997-），男，湖北武汉人，湖北工业大学硕士研究生，研究方向为岩土工程
［通信作者］ 庄心善（1964-），男，河南周口人，湖北工业大学教授，研究方向为岩土工程及边坡工程
更新日期/Last Update: 2022-04-29