Response of Borehole Strain Observation Data to Air Pressure Based on EEMD. Issue 1 (February 2020)

• Record Type: Journal Article
• Authors: Li, Hongwei; Song, Meiqin
• Is Part Of: IOP conference series. Volume 750:Issue 1(2020)
• Publication Date: 2020-02
• Subjects: Air Pressure -- Borehole Strain -- Frequency Dependence -- EEMD; Materials science -- Periodicals; 620.1105
• DOI: 10.1088/1757-899X/750/1/012066
• Languages: English
• ISSNs: 1757-8981

Abstract

Abstract: In this paper, based on the empirical mode decomposition (EEMD) method, considering the frequency dependent characteristics of the pressure response, the borehole strain observation data of Daixian station in Shanxi Province and the pressure observation curve of synchronous observation are decomposed, and the eigenmode function (IMF) sequences of different frequency bands are obtained. Then, on the same narrow frequency band of IMF, the one-dimensional regression analysis of borehole strain observation value and pressure change is carried out respectively, and the frequency dependent pressure response coefficient is obtained, which realizes the refined pressure correction of borehole observation data. The results show that this method can effectively deduct the influence of air pressure, and the frequency distribution characteristics of air pressure response are clear.