动载作用频率对海相沉积软土动态流变特性影响试验研究
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摘要
动态载荷作用下软弱岩土加速流变,引发更多的岩土工程事故和地质灾害。采集厦门海相沉积软土,采用人工重塑试样,在动态三轴仪上测试正弦荷载作用及不同频率条件下试样流变过程的动应力-应变、流变过程动应变-时间、流变应变等动态流变力学特性,对比分析了动载作用频率对海相沉积软土动态流变特性影响。试验测试分析表明:软土的动态流变特性对低频动载作用更敏感,流变效应更明显,而在高频动载作用下流变敏感性差,流变变形缓慢。研究结论为探索动载作用频率对软弱岩土动态流变力学特性影响,揭示动载作用诱发重大岩土地质灾害的流变动力学机制等具有一定的理论和现实意义。
The rheological action of the soft rock-soil could be accelerated by the dynamic loading,which induces more geotechnical engineering accidents and geologic disasters.The samples of marine deposit soft soil are collected in Xiamen,and the dynamic rheological characteristics of dynamic stress-strain,rheological strain-time and rheological displacement are tested under the different frequencies of dynamic loading of sinusoidal variation using dynamic-triaxial device and remodeled samples.The influence on rheological characteristics of marine deposit soft soil is analyzed under different frequencies of dynamic loading.The experimental analysis indicates that when the frequency of dynamic loading is low,the rheological dynamic characteristics sensitivity of marine deposit soft soil is obvious,and the rheological distortion is quick.But when the frequency of dynamic loading is high,the rheologic dynamic characteristics sensitivity of marine deposit soft soil is not obvious,and the rheologic distortion is slow.The research results have theoretical and actual significance for us to open out the dynamic rheological characteristics and the rheologic dynamic mechanism of bursting out geologic disaster under dynamic loading with different frequencies.
The rheological action of the soft rock-soil could be accelerated by the dynamic loading,which induces more geotechnical engineering accidents and geologic disasters.The samples of marine deposit soft soil are collected in Xiamen,and the dynamic rheological characteristics of dynamic stress-strain,rheological strain-time and rheological displacement are tested under the different frequencies of dynamic loading of sinusoidal variation using dynamic-triaxial device and remodeled samples.The influence on rheological characteristics of marine deposit soft soil is analyzed under different frequencies of dynamic loading.The experimental analysis indicates that when the frequency of dynamic loading is low,the rheological dynamic characteristics sensitivity of marine deposit soft soil is obvious,and the rheological distortion is quick.But when the frequency of dynamic loading is high,the rheologic dynamic characteristics sensitivity of marine deposit soft soil is not obvious,and the rheologic distortion is slow.The research results have theoretical and actual significance for us to open out the dynamic rheological characteristics and the rheologic dynamic mechanism of bursting out geologic disaster under dynamic loading with different frequencies.
引文
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[9]朱维申,郑文华,王文涛.新型节理岩体损伤流变模型数值模拟研究[J].岩土工程学报,2010,32(7):1011-1016.ZHU Wei-shen,ZHENG Wen-hua,WANG Wen-tao.Numerical simulation of a new damage rheology model for jointed rock mass[J].Chinese Journal of Rock Mechanics and Engineering,2010,32(7):1011-1016.
[10]朱杰兵,汪斌,邬爱清.锦屏水电站绿砂岩非线性损伤蠕变本构模型研究[J].岩石力学与工程学报,2010,29(3):528-534.ZHU Jie-bing,WANG Bin,WU Ai-qing.Study of unloading triaxial rheological tests and its nonlinear damage constitutive model of Jinping station green sandstone[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(3):528-534.
[11]胡华.动载作用下淤泥质软土流变模型与流变方程[J].岩土力学,2007,28(2):237-240.HU Hua.The rheological model and rheological equation of sullage soft soil under dynamic loading[J].Rock and Soil Mechanics,2007,28(2):237-240.
[12]胡华,顾恒星,俞登荣.淤泥质软土动态流变特性与流变参数研究[J].岩土力学,2008,29(3):696-700.HU Hua,GU Heng-xing,YU Deng-rong.Research on dynamic rheological characteristics and rheologic parameters of sullage soft soil[J].Rock and Soil Mechanics,2008,29(3):696-700.
[13]胡华,俞登荣,顾恒星.动载作用下软弱岩土地质灾害流变动力学研究[J].自然灾害学报,2007,16(4):61-65.HU Hua,YU Deng-rong,GU Heng-xing.The analysis of dynamic rheologic mechanics for soft rock-soil to burst out geologic disaster[J].Journal of Natural Disasters,2007,16(4):61-65.
[2]汪发武.地震和降雨诱发的两个流动性滑坡的流动化机制及运动模拟[J].岩石力学与工程学报,2005,24(10):1654-1661.WANG Fa-wu.Fluidization mechanisms and motion simulation on flowslides triggered by earthquake and rainfall[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(10):1654-1661.
[3]高延法,范庆忠,崔希海,等.岩石流变及其扰动效应,北京:科学出版社,2007.
[4]蒋昱州,徐卫亚,王瑞红.角闪斜长片麻岩流变力学特性研究[J].岩土力学,2011,32(增刊1):339-345.JIANG Yu-zhou,XU Wei-ya,WANG Rui-hong.Investigation on rheological mechanical properties of hornblende plagioclase gneiss[J].Rock and Soil Mechanics,2011,32(Supp.1):339-345.
[5]范庆忠,高延法,崔希海.软岩非线性蠕变模型研究[J].岩土工程学报,2007,29(4):505-509.FAN Qing-zhong,GAO Yan-fa,CUI Xi-hai.Study of nonlinear creep model of soft rock[J].Chinese Journal of Geotechnical Engineering,2007,29(4):505-509.
[6]黄耀英,郑宏.节理岩体等效损伤流变模型初步研究[J].岩土力学,2011,32(12):3566-3570.HUANG Yao-ying,ZHENG Hong.Preliminary study of equivalent damage rheological model for jointed rock[J].Rock and Soil Mechanics,2011,32(12):3566-3570.
[7]孙钧.岩石流变力学及其工程应用研究进展[J].岩石力学与工程学报,2007,26(6):1081-1106.SUN Jun.Rock rheolodical mechanics and its advance in engineering applications[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(6):1081-1106.
[8]徐卫亚,杨圣奇,褚卫江.岩石非线性黏弹塑性流变模型(河海模型)及其应用[J].岩石力学与工程学报,2006,25(3):433-446.XU Wei-ya,YANG Sheng-qi,CHU Wei-jiang.Nonlinear viscoelasto-plastic rheological model(Hohai model)of rock and its engineering application[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(3):433-446.
[9]朱维申,郑文华,王文涛.新型节理岩体损伤流变模型数值模拟研究[J].岩土工程学报,2010,32(7):1011-1016.ZHU Wei-shen,ZHENG Wen-hua,WANG Wen-tao.Numerical simulation of a new damage rheology model for jointed rock mass[J].Chinese Journal of Rock Mechanics and Engineering,2010,32(7):1011-1016.
[10]朱杰兵,汪斌,邬爱清.锦屏水电站绿砂岩非线性损伤蠕变本构模型研究[J].岩石力学与工程学报,2010,29(3):528-534.ZHU Jie-bing,WANG Bin,WU Ai-qing.Study of unloading triaxial rheological tests and its nonlinear damage constitutive model of Jinping station green sandstone[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(3):528-534.
[11]胡华.动载作用下淤泥质软土流变模型与流变方程[J].岩土力学,2007,28(2):237-240.HU Hua.The rheological model and rheological equation of sullage soft soil under dynamic loading[J].Rock and Soil Mechanics,2007,28(2):237-240.
[12]胡华,顾恒星,俞登荣.淤泥质软土动态流变特性与流变参数研究[J].岩土力学,2008,29(3):696-700.HU Hua,GU Heng-xing,YU Deng-rong.Research on dynamic rheological characteristics and rheologic parameters of sullage soft soil[J].Rock and Soil Mechanics,2008,29(3):696-700.
[13]胡华,俞登荣,顾恒星.动载作用下软弱岩土地质灾害流变动力学研究[J].自然灾害学报,2007,16(4):61-65.HU Hua,YU Deng-rong,GU Heng-xing.The analysis of dynamic rheologic mechanics for soft rock-soil to burst out geologic disaster[J].Journal of Natural Disasters,2007,16(4):61-65.
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