Thermoelastic stresses in non-uniform geological environments difficult outline
DOI:
https://doi.org/10.18372/2306-1472.42.1815Keywords:
dislocation, non-uniform environment, thermoelastic stressesAbstract
Thermal stresses concern not renewed type of stresses, that is once having liberated, they cannot accumulate more. The estimation of purely thermoelastic contribution to a lithosphere stress state gives the additional information, allowing to predict the danger connected with such natural factors, as seismic and volcanic activity. Some theoretical thermoelastic problems for the geological environment of a difficult outline with non-uniform thermophysical characteristics are considered. The decision is received on the basis of a numerical finite elements method. Influence of the model fixation, the geometrical factor and boundary conditions on distribution of thermal stresses and dislocation is investigated. Computing experiments have shown, that the size of the maximum thermal stresses reaches 500 bar. The maximum values of vertical dislocation are reached by 90 m, and horizontal — 50 m. Neutral plane position are precisely defined.
References
Bott M.H.P. The origin of tectonic stress in the lithosphere / M.H.P. Bott, N.I. Kusznir // Tectonophysics. − 1984. − 105, No 1−4. − C. 1−13.
Turcotte D.L. Are transform faults thermal contraction cracs? / D.L. Turcotte // J. Geophys. Res. − 1974. − 79. − C. 585−587.
Turcotte D.L. Membrane tectonics / D.L. Turcotte // Geophys. J.R. Astron. Soc. − 1974. − 36. − C. 33−42.
Turcotte D.L. Mid-plate tectonics / D.L. Turcotte, E.R. Oxburgh // Nature. − 1973. − 244, № 5415. − C. 337−339.
Turcotte D.L. Stress accumulation in the lithosphere / D.L. Turcotte, E.R. Oxburgh // Tectonophysics. − 1976. − 35, No.1−3. − C. 183−199.
Sandwell D.T. Thermal stress and spacing of transform faults / D.T. Sandwell // J. Geophys. Res. −1986. − 91. − C. 6405−6417.
Jadamec M.A. Analytic model for orogenic collapse / M.A. Jadamec, D.L. Turcotte, P. Howell // Tectonophysics. − 2007. − 435. − C. 1−12.
Manaker D.M. Damage formation associated with bending under a constant moment / D.M. Manaker, D.L. Turcotte, L.H. Kellogg // Tectonophysics. − 2007. − 433. − C. 81−95.
Holliday J.R. A review of earthquakes statistics: fault and seismicity-based models, ETAS and BASS / J.R. Holliday, D.L. Turcotte, J.B. Rundle // Pure and Applied Geophysics. − 2008. − 165, No 6. − C. 1003−1024.
Бахова Н.И. Тепловые неоднородности и напряженное состояние океанической литосферы // Геотермия сейсмичных и асейсмичных зон. − М.: Наука, 1993. − С. 86−92.
Зенкевич О. Метод конечных элементов в технике. − М.: Мир, 1975. − 541 с.
Ландау Л.Д. Теория упругости / Л.Д. Ландау, Е.М. Лифшиц. − М.: Наука, 1987. − 246 с.
