| 基于振动台试验的加速度积分位移方法可靠性研究 |
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| 引用本文： | 王体强,王永志,袁晓铭,汤兆光,王海,段雪锋.基于振动台试验的加速度积分位移方法可靠性研究[J].岩土力学,2019,40(Z1):565-573. |
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| 作者姓名： | 王体强 王永志 袁晓铭 汤兆光 王海 段雪锋 |
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| 作者单位： | 中国地震局工程力学研究所 地震工程与工程振动重点实验室，黑龙江 哈尔滨 150080 |
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| 基金项目： | 中国地震局工程力学研究所基本科研业务费专项项目（No.2017B05）；国家自然科学基金项目（No.51609218）；黑龙江省自然科学基金资助项目（No.YQ2019E035）。 |
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| 摘 要： | 土体应变变形是土工测试技术的重要难题之一，加速度积分位移是目前动荷载下原位监测和模型试验中认识土体剪应变响应的一种普遍方法，但缺乏验证与可靠性研究。设计砂质边坡?摇臂?质量块振动台模型试验，实测两地震荷载下多组工况的质量块加速度与位移响应时程，探讨了4种代表性方法求解动态、永久位移的可靠性及偏转影响。结果表明，动态位移求解采用高通滤波是一种可靠途径且受积分方式影响较小，各方法在动态位移工况中积分位移与实测相比，峰值平均误差小于等于25%；双拟法积分位移发生严重偏离，与函数形式和处理过程相关。永久位移求解采用高通滤波导致加速度低频成分缺失而无法得到永久位移；双拟法积分位移与实测相比吻合较好，两地震荷载中误差分别为7%和5%；偏转对动态位移求解可靠性影响较小，但对永久位移影响严重，双拟法呈现发散而失真。试验方法与结论，对认识加速度积分位移求取土体剪应变的可靠性和合理选取数据分析方法具有重要科学价值和指导意义。
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| 关 键 词： | 土工测试 加速度时程 积分位移 数据分析方法 振动台试验 可靠性 |
| 收稿时间： | 2019-01-08 |
Reliability analysis of acceleration integral displacement method based on shaking table tests |
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| WANG Ti-qiang,WANG Yong-zhi,YUAN Xiao-ming,TANG Zhao-guang,WANG Hai,DUAN Xue-feng.Reliability analysis of acceleration integral displacement method based on shaking table tests[J].Rock and Soil Mechanics,2019,40(Z1):565-573. |
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| Authors: | WANG Ti-qiang WANG Yong-zhi YUAN Xiao-ming TANG Zhao-guang WANG Hai DUAN Xue-feng |
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| Institution: | Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics,
China Earthquake Administration, Harbin, Helong 150080, China |
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| Abstract: | Measurement on strain deformation of soils is one of the significant challenge in geotechnical testing technology. Double integration of acceleration measurement for displacement is a common method in understanding the shear strain response of soil in in-situ monitoring and model tests under dynamic loading, but it lacks validity and reliability study. In this paper, the sand-slope-rocker-mass vibration table model test was designed, besides the mass acceleration and time-history response of displacement under multiple working conditions and two seismic loads were measured. Four representative methods were applied to solve dynamic and permanent displacement and their reliability and deflection effects were discussed. The results show that high-pass filtering method, which is less affected by the integral methods, is reliable to obtain dynamic displacements. Comparing the integral displacement with the measurement values in different dynamic displacement conditions under two earthquake loadings, the average errors of peak values are less than 25%. However, the dynamic displacements calculated by double integration present obvious deviation, which is related to the function form and processing flow. To obtain permanent displacements, the integral methods consisting of high-pass filtering process are invalidated due to the loss in low frequency components of acceleration records. The permanent displacements calculated by double integration method are in good agreement with the measured values. The relative errors are 7% and 5% respectively under two seismic loading conditions. The base deflection presents less impact on the reliability of dynamic displacements in different integral methods. But it plays obvious impacts on the permanent displacements. The permanent displacements calculated by double integration are distorted induced by the influence of base deflection. Experimental methods and conclusions herein provide valuable scientific reference and useful suggestions in the selection of double integral methods of acceleration to obtain soil displacement . |
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| Keywords: | geotechnical testing acceleration time history integral displacement data analysis methods shaking table tests reliability |
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