Regression Analysis of Initial Stress Field Around Faults Based on Fault Throw by Displacement Discontinuity Method

doi:10.1007/s12204-013-1423-0

Abstract

Abstract: The back analysis of initial stress is usually based on measured stress values, but the measuring of initial stress demands substantial investment. Therefore, amounts of underground engineering have no measured initial stress data, such as tunneling engineering. Focusing on this problem, a new back analysis method which does not need measured initial stress data is developed. The fault is assumed to be caused by initial load, the displacement discontinuity method (DDM) which considered non-linear fault is adopted to establish a numerical model of the engineering site, and the multivariable regression analysis of the initial stress field around the faults is carried out based on the fault throw. The result shows that the initial stress field around the faults is disturbed significantly, stress concentration appears in the tip zone, the regressive fault throw matches the measured values well, and the regressive initial stress field is reliable.

Key words: displacement discontinuity method (DDM)| fault| initial stress field| regression analysis| numerical simulation

摘要： The back analysis of initial stress is usually based on measured stress values, but the measuring of initial stress demands substantial investment. Therefore, amounts of underground engineering have no measured initial stress data, such as tunneling engineering. Focusing on this problem, a new back analysis method which does not need measured initial stress data is developed. The fault is assumed to be caused by initial load, the displacement discontinuity method (DDM) which considered non-linear fault is adopted to establish a numerical model of the engineering site, and the multivariable regression analysis of the initial stress field around the faults is carried out based on the fault throw. The result shows that the initial stress field around the faults is disturbed significantly, stress concentration appears in the tip zone, the regressive fault throw matches the measured values well, and the regressive initial stress field is reliable.

关键词: displacement discontinuity method (DDM)| fault| initial stress field| regression analysis| numerical simulation

CLC Number:

TU 453

LI Ke1,2* (李科), WANG Ying-yi3 (王颖轶), HUANG Xing-chun2,3 (黄醒春). Regression Analysis of Initial Stress Field Around Faults Based on Fault Throw by Displacement Discontinuity Method[J]. Journal of shanghai Jiaotong University (Science), 2013, 18(4): 474-478.

References

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