压实度对脱硫石膏动模量和阻尼比的影响试验研究

详细信息    查看全文 | 推荐本文 |

英文篇名：Influence of Compactness on Dynamic Modulus and Damping Ratio of Desulphurized Gypsum 作者：谭彩 ; 万里 ; 袁明道 ; 卢博 ; 林悦奇 英文作者：TAN Cai;WAN Li;YUAN Ming-dao;LU Bo;LIN Yue-qi;Guangdong Research Institute of Water Resources and Hydropower;State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University;College of Water Resource & Hydropower Engineering, Sichuan University;Power China Zhongnan Engineering Corporation Limited; 关键词：脱硫石膏 ; 压实度 ; 动模量 ; 阻尼比 ; 动应变 ; 归一化 英文关键词：desulphurization gypsum;;degree of compaction;;dynamic modulus;;damping ratio;;dynamic strain;;normalization 中文刊名：CJKB 英文刊名：Journal of Yangtze River Scientific Research Institute 机构：广东省水利水电科学研究院;四川大学水力学与山区河流开发保护国家重点实验室;四川大学水利水电学院;中国电建集团中南勘测设计研究院有限公司; 出版日期：2019-07-15 出版单位：长江科学院院报 年：2019 期：v.36;No.249 基金：深圳市水务发展专项资金科技创新项目(20170103);; 广东省水利科技创新项目(2014-09) 语种：中文; 页：CJKB201907029 页数：6 CN：07 ISSN：42-1171/TV 分类号：135-140

摘要

为研究不同压实度下脱硫石膏动模量与阻尼比特性,分别对压实度为0.85,0.90,0.95的3组脱硫石膏试样进行动三轴试验。试验分为等压固结和偏压固结试验2部分,等压固结试验固结应力比为1,围压分别为100,200,400 kPa;偏压固结试验围压为100 kPa,固结应力比分别为1.0,1.5,2.0。试验结果表明:随压实度增大,脱硫石膏动模量逐渐增大,阻尼比在动应变<10~(-5)时差异不明显,动应变>10~(-5)时逐渐减小;初始动模量与压实度具有良好的幂相关关系,建立了考虑压实度影响的初始动模量公式,进而推求了考虑压实度影响的动模量衰减全过程曲线;归一化的脱硫石膏动模量和阻尼比差异较小,试验用脱硫石膏参考动应变取值范围为1×10~(-4)～4×10~(-4)。
        Dynamic triaxial tests were carried out on three groups of desulphurized gypsum samples with compactness of 0.85, 0.90, and 0.95 to examine the dynamic modulus and damping ratio of desulphurized gypsum with varied compactness. The test was divided into two parts: isotropic consolidation test and anisotropic consolidation test, of which the former was conducted at consolidation stress ratio 1 under confining pressure as of 100 kPa, 200 kPa, and 400 kPa, respectively, and the latter at consolidation stress ratio 1, 1.5, and 2 under confining pressure as of 100 kPa. Test results evinced that with the increase of degree of compaction, the dynamic modulus of desulphurized gypsum augmented gradually; damping ratio changed inapparently when dynamic strain was less than 10~(-5), and gradually reduced when dynamic strain exceeded 10~(-5).The initial dynamic modulus displayed a good power correlation with compaction degree. The formula of initial dynamic modulus in consideration of the influence of compaction degree was established, and the holistic process curve of dynamic modulus attenuating with the change of compaction degree was also obtained. In addition, the normalized dynamic modulus and damping ratio of desulphurized gypsum showed little difference. The range of reference dynamic strain of desulphurized gypsum was given as 1×10~(-4)～4×10~(-4).

引文

[1] 彭君,罗启迅,陈群.掺石膏灰渣混合料的力学性质试验分析[J].水电能源科学,2014,32(11):121-123.
    [2] 吴勇,王伟,王琛,等.干密度对粉煤灰力学性质的影响[J].四川建筑科学研究,2014,40(4):247-249.
    [3] 张超,杨春和,余克井,等.磷石膏物理力学特性初探[J].岩土力学,2007,28(3):461-466.
    [4] HARDIN B O,RECHART E E.Elastic Wave Velocities Granular Soils[J].Journal of the Soil Mechanics and Foundations Division,1963,89(1):33-65.
    [5] SEED H B,WONG R T,IDRISS I M,et al.Moduli and Damping Factors for Dynamic Analyses of Cohesionless Soils[J].Journal of Geotechnical Engineering,1984,112(11):1016-1032.
    [6] KALLIOGLOU P,TIKA T H.Shear Modulus and Damping Ratio of Cohesive Soils[J].Journal of Earthquake Engineering,2008,12(6):879-913.
    [7] 何昌荣.动模量和阻尼的动三轴试验研究[J].岩土工程学报,1997,19(2):39-48.
    [8] 李瑞山,陈龙伟,袁晓铭.荷载频率对动模量阻尼比影响的试验研究[J].岩土工程学报,2007,39(1):71-80.
    [9] 唐杰鑫,陈勇,李平,等.低频振动下库区粉土的动力特性试验研究[J].武汉大学学报(工学版),2016,49(6):844-848.
    [10] 尹光志,王文松,魏作安,等.小打鹅尾矿库筑坝尾矿的动力学特性试验研究[J].岩石力学与工程学报,2017,36(增刊1):3121-3130.
    [11] 边学成,卢文博,蒋红光,等.粉土循环累积应变和残余动模量的试验研究[J].岩土力学,2013,34(4):974-980.
    [12] 周勤,赵发章,张洪亮.压实度和含水量对于压实黄土力学特性的影响[J].公路,2006,(1):67-70.
    [13] 朱明龙.脱硫石膏的动力特性及动力稳定性研究[D].成都:四川大学,2014.
    [14] SL 237—1999,土工试验规程[S].北京:中国水利水电出版社,1999.
    [15] 谭彩.含细粒砂动力特性试验及数值模拟[D].成都:四川大学,2017.
    [16] 谢定义.土动力学[M].北京:高等教育出版社,2011.
    [17] 孙德安,吴波.非饱和粉土的动弹性模量和阻尼比研究[J].水利学报,2012,43(9):1108-1113.
    [18] 尚守平,岁小溪,周志锦,等.橡胶颗粒-砂混合物动剪切模量的试验研究[J].岩土力学,2010,31(2):377-381.
    [19] 孙静,袁晓铭,孙锐.固结比对土最大动剪切模量的影响[J].世界地震工程,2010,26(增刊1):75-79.
    [20] HARDIN B O,DRNEVICH V P.Shear Modulus and Damping in Soils:Design Equations and Curves[J].Journal of the Soil Mechanics and Foundation Division,ASCE,1972,98(SM7):667-692.