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Research on Ground Stress Distribution Charcteristics and Its Effect on Roadway Surrounding Rock Stablity

Author: GaoFeng
Tutor: WangLianGuo
School: China University of Mining and Technology
Course: Engineering Mechanics
Keywords: Ground stress Situ stress measurement Inverse finite element analysis Combined neural network The Tunnel Stability
CLC: P553
Type: PhD thesis
Year: 2009
Downloads: 1282
Quote: 5
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Abstract


Situ stress caused by mining, water conservancy and hydropower, civil construction, and a variety of other underground geotechnical deformation and destruction of the fundamental forces. China's coal mining depth increased by ground stress caused by the instability of surrounding rock, rock burst accident risk is increasing, Need in-depth study of China's mining has become a major issue. In this paper the applied stress measurement technology, geomechanics theory, artificial neural networks, particle swarm optimization theory and numerical simulation analysis means a systematic study of ground stress distribution law and its impact on the Tunnel Stability as innovative research results: (1) a detailed analysis of the causes of ground stress and its influencing factors and Huozhou mine, for example, the integrated use of the theory of geomechanics, earthquake focal mechanism solutions analysis and crustal deformation GPS determination method, the mining area stress field macro analysis. Restore the mine and surrounding area paleo-stress field evolution, determine mine macro stress field of the type and principal compressive stress axis advantage orientation distribution range, provides a basis to verify the correctness of the results of ground stress measurement. Combined with the actual production system layout measuring point, stress relief method of mass measured stress of the entire mining area, obtained by theoretical analysis of the distribution of stress field of the mining area. (2) use of the basic theory of geomechanics to establish a computational model of the regional stress field mechanics, elasticity analysis of different forms of boundary loading conditions, the expressions of stress components. Huozhou the mine measured data for the study area, to the of Cao Village and Xinzhi mine, ground stress field of finite element Multivariate Regression Analysis. The calculation results show that the ground stress field of the area to the horizontal stress is mainly due to the geological structure and lithology differences, the maximum principal stress range and relatively higher presence of stress zone. (3) Based on the measured data of the the Huozhou mine a lot of ground stress, particle swarm optimization training BP artificial neural network, established situ stress predicted combined neural network model (PSO-BP model) and take full advantage of the learning ability of the neural network, establish nonlinear mapping between real Cece point parameters corresponding point to stress, and stress distribution status Josephine Lee Coal Mine and Caocun, mine different locations were successfully predicted. (4) based on geological information and the measured petrophysical, mechanical parameters, the numerical simulation method coal Road axial with the direction of the maximum principal stress angle α changes, backplane and two gang stress, displacement and plastic zone of roadway roof the impact was analyzed. The results showed that the maximum principal stress a significant impact on the stability of the surrounding rock the obtained α gt; 45 °, the conclusion of the sudden increase in the variation of the stress, displacement and plastic zone of surrounding rock, the statistical analysis of the actual destruction of the underground tunnel also confirmed the above conclusions. (5) give full consideration to stress the impact on the Tunnel Stability dynamic retaining bolt support based on the measured stress design method for high stress Swell surrounding rock rock bolting in design and successfully achieved a good supporting effect.

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CLC: > Astronomy,Earth Sciences > Geology > Geomechanics > Crustal stress and active tectonics
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