利用MTS815 Flex Test 40岩石力学试验系统对粉砂质泥岩和泥质粉砂岩进行三轴循环荷载试验。研究两种岩石在三轴循环荷载作用下,动剪切模量和动泊松比参数的变化规律。结果表明:1)在相同轴向振动荷载和振动次数作用下,两种岩石的动剪切...利用MTS815 Flex Test 40岩石力学试验系统对粉砂质泥岩和泥质粉砂岩进行三轴循环荷载试验。研究两种岩石在三轴循环荷载作用下,动剪切模量和动泊松比参数的变化规律。结果表明:1)在相同轴向振动荷载和振动次数作用下,两种岩石的动剪切模量随着围压的增加呈现出先增加再减小的变化规律,动泊松比没有明显的变化规律。2)在相同围压和轴向振动荷载作用下,两种岩石的动剪切模量随着振动次数的增加呈现逐渐减小的变化规律,动泊松比呈现逐渐增加的变化规律。3)在相同围压和振动次数下,两种岩石的动剪切模量与动泊松比随着轴向振动荷载的增加都无明显规律。试验成果对研究岩土工程地基岩石的地震反应和边坡工程的安全稳定性评价可提供参考依据。展开更多
对取自一拟建核电站地基的细砂岩,在MTS815 Flex Test GT岩石力学试验系统上进行低周循环荷载试验,研究循环荷载下细砂岩的纵横向变形特征,探讨循环荷载周次及动应力幅值对细砂岩动弹性模量、动泊松比、阻尼比和阻尼系数的影响,及与其...对取自一拟建核电站地基的细砂岩,在MTS815 Flex Test GT岩石力学试验系统上进行低周循环荷载试验,研究循环荷载下细砂岩的纵横向变形特征,探讨循环荷载周次及动应力幅值对细砂岩动弹性模量、动泊松比、阻尼比和阻尼系数的影响,及与其相互关系。结果表明,相同应力下纵向应变高于横向应变;低幅值应力下,随循环荷载周次增加,纵向应变增量高于横向应变增量,但高幅值应力下则相反;横向应变滞回环的卸载阶段应力–应变曲线与纵向应变滞回环的加载段和卸载段均表现出向下突出的变化特征,但横向应变滞回环的加载段则相反;随动应力幅值增加,细砂岩动弹性模量和动泊松比分别呈抛物线递增和线性递增,阻尼比和阻尼系数均按幂函数律递减,由第16周次动应力滞回环得到的阻尼参数可表征测试岩石的阻尼特征;阻尼比和阻尼系数均随循环荷载周次增加线性递增,对应低幅值动应力下的增量大于高幅值动应力下的增量。展开更多
The influence of the dispersion and uncertainty of the dynamic shear wave velocity and Poisson＇s ratio of soil in a hard rock site was investigated on the seismic response of reactor building structure. The analysis ...The influence of the dispersion and uncertainty of the dynamic shear wave velocity and Poisson＇s ratio of soil in a hard rock site was investigated on the seismic response of reactor building structure. The analysis is performed by considering the soil-structure interaction effects and based on the model of the reactor building in a typical pressurized water reactor nuclear power plant （NPP）. The numerical results show that for the typical floor selected, while the relative increment ratio of the dynamic shear wave velocity varies from -30% to 30% compared to the basis of 1 930 m/s, the relative variation of the horizontal response spectra peak value lies in the scope of ±10% for the internal structure, and the relative variation of the frequency corresponding to the spectra peak is 0.0% in most cases. The relative variation of the vertical response spectra peak value lies in the scope of - 10% to 22%, and the relative variation of the frequency corresponding to the Spectra peak lies in the scope of - 22% to 4%. The analysis indicates that the dynamic shear wave velocity and the Poisson＇s ratio of the rock would affect the seismic response of structure and the soil-structure interaction effects should be considered in seismic analysis and design of NPP even for a hard rock site.展开更多
文摘利用MTS815 Flex Test 40岩石力学试验系统对粉砂质泥岩和泥质粉砂岩进行三轴循环荷载试验。研究两种岩石在三轴循环荷载作用下,动剪切模量和动泊松比参数的变化规律。结果表明:1)在相同轴向振动荷载和振动次数作用下,两种岩石的动剪切模量随着围压的增加呈现出先增加再减小的变化规律,动泊松比没有明显的变化规律。2)在相同围压和轴向振动荷载作用下,两种岩石的动剪切模量随着振动次数的增加呈现逐渐减小的变化规律,动泊松比呈现逐渐增加的变化规律。3)在相同围压和振动次数下,两种岩石的动剪切模量与动泊松比随着轴向振动荷载的增加都无明显规律。试验成果对研究岩土工程地基岩石的地震反应和边坡工程的安全稳定性评价可提供参考依据。
文摘对取自一拟建核电站地基的细砂岩,在MTS815 Flex Test GT岩石力学试验系统上进行低周循环荷载试验,研究循环荷载下细砂岩的纵横向变形特征,探讨循环荷载周次及动应力幅值对细砂岩动弹性模量、动泊松比、阻尼比和阻尼系数的影响,及与其相互关系。结果表明,相同应力下纵向应变高于横向应变;低幅值应力下,随循环荷载周次增加,纵向应变增量高于横向应变增量,但高幅值应力下则相反;横向应变滞回环的卸载阶段应力–应变曲线与纵向应变滞回环的加载段和卸载段均表现出向下突出的变化特征,但横向应变滞回环的加载段则相反;随动应力幅值增加,细砂岩动弹性模量和动泊松比分别呈抛物线递增和线性递增,阻尼比和阻尼系数均按幂函数律递减,由第16周次动应力滞回环得到的阻尼参数可表征测试岩石的阻尼特征;阻尼比和阻尼系数均随循环荷载周次增加线性递增,对应低幅值动应力下的增量大于高幅值动应力下的增量。
基金SUPPORTED BY NATIONAL NATURAL SCIENCE FOUNDATION FOR DISTINGUISHED YOUNG SCHOLARS OF CHINA (NO. 50425824).
文摘The influence of the dispersion and uncertainty of the dynamic shear wave velocity and Poisson＇s ratio of soil in a hard rock site was investigated on the seismic response of reactor building structure. The analysis is performed by considering the soil-structure interaction effects and based on the model of the reactor building in a typical pressurized water reactor nuclear power plant （NPP）. The numerical results show that for the typical floor selected, while the relative increment ratio of the dynamic shear wave velocity varies from -30% to 30% compared to the basis of 1 930 m/s, the relative variation of the horizontal response spectra peak value lies in the scope of ±10% for the internal structure, and the relative variation of the frequency corresponding to the spectra peak is 0.0% in most cases. The relative variation of the vertical response spectra peak value lies in the scope of - 10% to 22%, and the relative variation of the frequency corresponding to the Spectra peak lies in the scope of - 22% to 4%. The analysis indicates that the dynamic shear wave velocity and the Poisson＇s ratio of the rock would affect the seismic response of structure and the soil-structure interaction effects should be considered in seismic analysis and design of NPP even for a hard rock site.
