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作 者:刘红帅 宋东松 张东涛 李延冰 Liu Hongshuai;Song Dongsong;Zhang Dongtao;Li Yanbing(Institute of Geotechnical Engineering,Hebei University,Baoding 071002,Hebei,China;Hebei Excellent Earthquake Prevention Service Co.,Ltd.,Baoding 071027,Hebei,China)
机构地区:[1]河北大学岩土工程研究所,河北保定071002 [2]河北极致地震预防服务有限公司,河北保定071027
出 处:《吉林大学学报(地球科学版)》2023年第6期1826-1834,共9页Journal of Jilin University:Earth Science Edition
基 金:中国地震局工程力学研究所基本科研业务费专项资助项目(2019EEEVL0202);河北省高等学校科学技术研究项目(ZD2020157);河北省自然科学基金项目(E2020201017)。
摘 要:弯曲元是测试土体小应变动力学参数的常用手段,然而在使用弯曲元测试时,波形、频率、峰值和试样的尺寸对波在土体中传播时间的确定会造成一定的影响。目前大多从输入波的频率方面来研究其对输出信号传播时间确定的影响,但对输入波峰值、输入波形对输出信号的影响研究较少。基于此,采用弯曲元对干燥福建标准砂的小应变动力学参数进行了研究,分析了输入频率、输入波峰值、输入波形对输出信号的影响,以及土体相对密度和有效围压对侧线模量、剪切模量和泊松比的影响。结果表明:输入频率对S波(剪切波)的传播时间有明显影响,对P波(压缩波)基本没有影响;输入波峰值的大小对判别S波或P波的传播时间没有影响;输入波形对S波或P波的传播时间有显著的影响;土体的侧线模量、剪切模量和泊松比均随有效围压和孔隙比的增大呈指数形式变化。根据Hardin提出的小应变模量预测模型,拟合出了考虑有效围压和孔隙比耦合作用下的三维模型公式,可为实际工程中对侧线模量、剪切模量和泊松比的估算提供一定参考。The bender element is a commonly used method for testing small strain dynamic parameters of soil.However,when using bender element for testing,the waveform,frequency,peak value,and sample size can have a certain impact on the determination of the travel time of the wave in soil.At present,the influence of input wave on the travel time of output signal is mostly studid from the aspect of the frequency of input wave,but the the impact of the input wave peak and input waveform on the output signal is soldom studied.Therefore,in this paper the small strain dynamic parameters of dry Fujian standard sand were studied by bender element,and the effects of parameters such as input frequency,input wave peak,input waveform,relative density,and confining pressure on the constrained modulus,shear modulus,and Poisson’s ratio were analyzed.The results show that the input frequency has a significant effect on the travel time of S-wave(shear wave),and basically has no effect on P-wave(primary wave).The magnitude of the input wave peak has no effect on the travel time of S-wave or P-wave discrimination.The input waveform has a significant effect on the travel time of the S-wave or P-wave.The constrained modulus,shear modulus,and Poisson’s ratio of soil vary exponentially with the increase of confining pressure and pore ratio.Based on the small strain modulus prediction model proposed by Hardin,a three-dimensional model formula considering the coupling effect of confining pressure and pore ratio was fitted,which can provide certain reference for the estimation of constrained modulus,shear modulus,and Poisson’s ratio in practical engineering.
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