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| A new type of adaptive robust acceleration integration approach and reliability analysis |
| WANG Tiqiang1，WANG Yongzhi1，YUAN Xiaoming1，WANG Hai2，DUAN Xuefeng1 |
| (1. Key Laboratory of Earthquake Engineering and Engineering Vibration，Institute of Engineering Mechanics，China Earthquake Administration，Harbin，Heilongjiang 150080，China；2. School of Water Conservancy and Environment，University of Jinan，Jinan，Shandong 250022，China) |
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Abstract Acceleration array-based shear stress-shear strain inversion analysis approach is widely used in model tests and in-situ monitoring，but its accuracy and credibility have not yet reached consensus in the geotechnical engineering community. One of the important reasons is the lack of research on the reliability of integration approach for evaluating displacement from acceleration records. A new type of adaptive robust integration approach(ARI) is developed to avoid the influence of traditional human interference，empirical parameters，filtering and other factors. It has the characteristics of sensor deflection correction，self-matching of the fitting function，and residual displacement recognition. The shaking table test of sandy slope is designed and carried out under different conditions such as dynamic and deflection，the accuracy and reliability of ARI integrated displacement are discussed. The test results show that：compared with the USGS approach，the ARI approach effectively reduces the peak errors and the irregular lead of the resolution time caused by filtering. Compared with the recorded displacement，the average peak error of the ARI approach to solve the dynamic integrated displacement is 7.69%，the correlation coefficient is 0.99，and the spectral area error is 1.97% under three different periodic loads. Compared with the recorded displacement，the average peak error of the ARI approach is 8.92%，the correlation coefficient is 0.97，and the spectral area error is 4.21% under the influence of deflection. The results of the two sets of blind test experiments show that the sensors of different types and performance parameters have negligible influence on the integrated displacement accuracy and reliability of the ARI approach. The average peak error of 7–15 mm small displacement with high frequency is 9.74%. The ARI approach can maintain good adaptability and robustness under different displacements and periodic loads. The new type of adaptive robust integration approach for evaluating displacements from acceleration records and verification test results has important theoretical significance and application value to improve the scientific understanding of geotechnical model tests and in-situ monitoring of acceleration integral displacement and to enhance the scientific understanding of the inversion of shear stress-shear strain response of the internal soil.
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2021, Vol. 40 
