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介绍了基于加速度阵列建立的3种循环剪应力–剪应变反演方法,分析了应用条件和影响因素。基于一组软黏土场地加固动力离心模型试验,探讨了试验加速度记录反演位移的信号处理方法,与多状态下实测位移对比,验证了有效性与可靠性。运用3种反演方法分别求取了两次试验、多种波激励下,自由场地和加固场地内土体剪应力–剪应变动态响应过程。结果表明,在传感器布设间距和采样率满足应用条件下,3种反演方法可获得基本一致结果并反映基本规律,上层土体剪应力小、剪应变大,土体剪切模量与围压密切联系;自由场地剪应变远大于加固场地,并因土体软化呈现强非线性。3种方法对比,三次样条法反演结果准确性对传感器布设间距和采样率较为敏感。
Three kinds of cyclic shear stress-shear strain inversion methods based on acceleration array are introduced, and the application conditions and influencing factors are analyzed. Based on a set of dynamic centrifuge model experiments on soft clay reinforcement ground, the signal processing method of experimental acceleration recording inversion displacement was discussed. Compared with the measured displacement in multi-state, the validity and reliability were verified. Three kinds of inversion methods were used to calculate the dynamic response of shear stress-shear strain of soils in free field and reinforced site under two kinds of experiments and under different kinds of wave excitation respectively. The results show that the three inversion methods can obtain basically consistent results and reflect the basic rules under the application conditions when the sensor placement pitch and sampling rate meet the application conditions. The upper soil shear stress is small, the shear strain is large, and the shear modulus and the confining pressure Close contact; free site shear strain is much larger than the reinforcement site, and due to soil softening showed a strong nonlinear. Comparison of the three methods, the cubic spline inversion accuracy of the results of the sensor spacing and sampling rate is more sensitive.