A PROBLEM AND EXPLANATION FOR BOREHOLE STRAIN METER RECORDS OF CO-SEISMIC STRAIN STEPS

DONG Pei-yu; REN Tian-xiang; YANG Shao-hua; PANG Ya-jin; SHI Yao-lin

2015 Vol. 21, No. 3

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DONG Pei-yu, REN Tian-xiang, YANG Shao-hua, PANG Ya-jin, SHI Yao-lin. A PROBLEM AND EXPLANATION FOR BOREHOLE STRAIN METER RECORDS OF CO-SEISMIC STRAIN STEPS[J]. Journal of Geomechanics, 2015, 21(3): 359-370.

Citation:

DONG Pei-yu, REN Tian-xiang, YANG Shao-hua, PANG Ya-jin, SHI Yao-lin. A PROBLEM AND EXPLANATION FOR BOREHOLE STRAIN METER RECORDS OF CO-SEISMIC STRAIN STEPS[J]. Journal of Geomechanics, 2015, 21(3): 359-370.

A PROBLEM AND EXPLANATION FOR BOREHOLE STRAIN METER RECORDS OF CO-SEISMIC STRAIN STEPS

1.
Institute of Seismology, China Earthquake Administration, Wuhan 430071, China
2.
Key Laboratory of Computational Geodynamics, CAS, University of Chinese Academy of Sciences, Beijing 100049, China

More Information

Corresponding author: SHI Yao-lin, shiyl@ucas.ac.cn

Received Date: 04 January 2015

Publish Date: 25 September 2015

Abstract

Abstract

Observation data from 4-compnoent borehole strain meters can be self-checked by Δε^Ⅰ+Δε^Ⅲ=Δε^Ⅱ+Δε^Ⅳ. However, when strain meters record the co-seismic strain steps, the Δε^Ⅰ+Δε^Ⅲ is not often equal to the Δε^Ⅱ+Δε^Ⅳ, and observed values are greater than the theory solution. In this paper, the possible reasons were analyzed and several models with different initial confining stress and different stress disturbance caused by earthquake wave were established, with the finite element method of "kill element" and transverse isotropic" wounded element" to simulate the tension fracture or shear slip occur between metal cylinder and the cement sheath, and discuss which one is the real reason. The results indicate that tension fracture between the metal cylinder and the cement sheath account for the difference of Δε^Ⅰ+Δε^Ⅲ and Δε^Ⅱ+Δε^Ⅳ, and affect the co-seismic strain steps observation. Therefore, some new improved methods are needed when arranging borehole probe in the drilling-hole in order to reduce the observation error in future.
- finite element method /
- wounded element /
- kill element /
- co-seismic strain steps

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References

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