作者：蔡国军1,2, 卫俊仁1,2, 杨森林1,2, 蒲洪1,2, 李林1,2
作者单位：1. 地质灾害防治与地质环境保护国家重点实验室（成都理工大学），四川 成都 610059;
2. 成都理工大学地质工程国家级实验教学示范中心，四川 成都 610059
关键词：动三轴试验;磷石膏;偏压固结;动模量;阻尼比
摘要：
近年来，磷石膏废渣的生产和堆积迅速增长，给库区安全以及环境带来不小的隐患。该文利用英国GDS公司的GDS-DYNTTS型微机控制振动三轴试验系统，对杨家箐磷石膏堆场库区不同取土深度下的磷石膏废渣进行动力特性试验，主要针对其在围压较大、偏压固结条件下的动弹性模量Ed、阻尼比λ进行较详细的研究。试验结果表明：密度相同条件下，动弹性模量随着固结比和围压的增加而变大，且在动应变εd增长初期曲线变化率不大，εd超过0.01%后动弹性模量会迅速减小，再逐渐趋于平缓；利用Kondner模型发现最大动弹性模量倒数和动应变的曲线呈较好的线性关系；对动模量比(Ed/Ed0)曲线进行归一化分析，可以得出动模量与动应变的变化趋势，并且根据Darendeli模型对磷石膏动模量比的衰变阶段进行划分；利用最小二乘法对阻尼比与动弹性模量比λ- Ed/Ed0分布进行拟合，得到归一性较好的经验模型曲线。
Experimental study on dynamic modulus and damping ratio of phosphogypsum
CAI Guojun1,2, WEI Junren1,2, YANG Senlin1,2, PU Hong1,2, LI Lin1,2
1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection(Chengdu University of Technology), Chengdu 610059, China;
2. National Geological Engineering Experimental Teaching Demonstration Center of Chengdu University of Technology, Chengdu 610059, China
Abstract: Recent years, the production and accumulation of phosphogypsum waste residue have multiplied, which has brought great hidden trouble to the safety of reservoir area and environment.In this paper, the dynamic characteristics of the phosphogypsum waste residue from Yangjiaqing phosphogypsum storage yard at different depths are tested by GDS-DYNTTS microcomputer controlled vibration triaxial test system. The dynamic elastic modulus, Ed and damping ratio λ of the waste residue are studied in detail under the condition of large confining pressure and bias pressure consolidation. The experimental results show that under the same density, the dynamic elastic modulus increases with the increase of consolidation ratio and confining pressure, and the change rate of dynamic strain εd curve is little at the beginning of the increase, and the dynamic elastic modulus decreases rapidly after εd exceeds 0.01%, and then gradually becomes flat. Using Kondner's model, it is found that the inverse of the maximum dynamic elastic modulus has a good linear relationship with the dynamic strain curve. The dynamic modulus ratio (Ed/Ed0) curve was normalized to obtain the variation trend of the dynamic modulus and dynamic strain, and the decay stages of phosphogypsum dynamic modulus ratio were divided according to Darendeli's model. The least square method is used to fit the damping ratio and the λ-Ed/Ed0 distribution of dynamic elastic modulus ratio, and the empirical model curve with good normality is obtained.
Keywords: dynamic triaxial test;phosphogypsum;bias consolidation;dynamic modulus;damping ratio
2024, 50(5):11-18 收稿日期: 2022-02-20;收到修改稿日期: 2022-05-06
基金项目: 国家自然科学基金（41202209，41977255）；国家重点实验室自主课题（SKLGP2019Z017）；四川省科技计划（2019YJ0403）
作者简介: 蔡国军(1982-),男,江西抚州市人,高级实验师,博士,主要从事地质工程和岩土工程方面教学与科研工作。
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