Estimation of regional stress state and Young’s modulus by back analysis of mining-induced deformation

Abstract A method to evaluate regional stress state and Young’s modulus by analyzing the mining-induced deformation of ground is proposed. The effect of changes in regional strain state due to tectonic plate motion can be accounted for using the proposed method. Mining-induced deformation can manifest itself as changes in ground surface geometry resulting from mining activity. There are three underlying factors that can contribute to the deformation, these being: displacement induced by the effect of gravity; displacement induced by the effect of horizontal regional strain; and, incremental change in the horizontal regional strain. Both regional strain and Young’s modulus can be simultaneously estimated, because the displacement induced by the regional strain is independent of the Young’s modulus and the displacement induced by the gravity is inversely proportional to the Young’s modulus. The relative displacement arising from the mining excavation at the Torigatayama limestone mine in Japan has been measured by GPS. Both the regional stress state and Young’s modulus were estimated by back analysis of the relative displacement using a 3-D finite element method. It was shown that back analysis based on changes in distance between the measurement points provides a more reliable estimation than that could be achieved based on the direct relative displacement.

[2]  M. Matsu'ura,et al.  CMT data inversion using a Bayesian information criterion to estimate seismogenic stress fields , 2008 .

[3]  Mitsuhiro Matsu'ura,et al.  The 3‐D tectonic stress fields in and around Japan inverted from centroid moment tensor data of seismic events , 2010 .

[4]  N. Umino,et al.  Spatial distribution of focal mechanisms for interplate and intraplate earthquakes associated with the subducting Pacific plate beneath the northeastern Japan arc: A triple‐planed deep seismic zone , 2001 .

[5]  T. Sagiya,et al.  Continuous GPS Array and Present-day Crustal Deformation of Japan , 2000, pure and applied geophysics.

[6]  Yoshiaki Mizuta,et al.  Stress field determination from local stress measurements by numerical modelling , 2009 .

[7]  Katsuhiko Sugawara.  Trend of Research on Rock Stress Measurement. , 1998 .

[8]  Shigeo Nakama,et al.  Estimation of regional stress by FEM for a heterogeneous rock mass with a large fault , 2009 .

[9]  M. Matsu'ura,et al.  Geodetic data inversion based on Bayesian formulation with direct and indirect prior information , 2007 .

[10]  Osam Sano,et al.  Measurement Methods of Contemporary Stress Field and Rock Mechanics , 2005 .

[11]  Shozo Kimura.  Some Characteristics of Seismic Activities in and around Shikoku in Relation to the 1946 Nankai Earthquake , 2001 .

[12]  Stephen D. McKinnon,et al.  Analysis of stress measurements using a numerical model methodology , 2001 .

[13]  Naoyuki Fujii,et al.  Stress memory of crystalline rocks in acoustic emission , 1979 .

[14]  Yuzo Obara,et al.  Measurement of local stress and estimation of regional stress associated with stability assessment of an open-pit rock slope , 2000 .

[15]  K. Kaneko,et al.  Stability Assesment of Rock Slope by Displacement Measurement , 1996 .

[16]  Enviromental Preservation in Chichi.  Study of Cooperative Development and Slope Stability at Mt.Bukoh. , 1996 .

[17]  Y. Obara,et al.  Estimation of Global Stress State in Mt.Torigata Region. , 2000 .

[18]  M. Kasahara,et al.  Spatial variation in seismotectonics and stress conditions across the Kurile and Japan trenches inferred from the analysis of focal mechanism data in Hokkaido, northern Japan , 2009 .

[19]  T. Yoshii.  A detailed cross-section of the deep seismic zone beneath northeastern Honshu, Japan , 1979 .

[20]  Yoshiaki Mizuta,et al.  Determination of Far Field Stress from the Point Stress Measurement, a Numerical Approach , 1998 .

[21]  K. Kaneko,et al.  Measurement and interpretation of long-term deformation of a rock slope at the Ikura limestone quarry, Japan , 2009 .

[22]  M. Ichikawa,et al.  Reanalyses of mechanism of earthquakes which occurred in and near Japan, and statistical studies on the nodal plane solutions obtained, 1926-1968. , 1971 .