Stress transfer characteristics and deformation law of filling floor of #br# pier-column structure#br#
WANG Feng1，2，GUO Yuxia1，2，3，FENG Guorui1，2，3，XIE Wenshuo1，2，YE Xiaoli1，2，MA Jiahui1，2
(1. College of Mining Engineering，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China；2. Shanxi Province Research Centre of Green Mining Engineering Technology，Taiyuan，Shanxi 030024，China；3. Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering，Taiyuan，Shanxi 030024，China)
Abstract：In order to investigate the impact of stress transmission from the filling body on the underlying rock layer during the filling mining process，a composite structure model of the filling body-bottom plate was constructed using the similarity principle in a coal mine in Qinshui coalfield. The laboratory experiments and numerical simulations were carried out to study the movements of the top and bottom plates，the failure modes of the bottom plate，and the plastic zone ranges of the column-and-pillar filling mining under different filling body strengths and filling distances. The results indicate that：(1) the most significant stress concentration occurs under the filling body in the shallow bottom plate. This stress is diagonally transmitted downward at a 45° angle，causing horizontal stress and ultimately spreading to the entire bottom plate. As the stress transmits downward，the vertical stress becomes smaller and more uniform and the horizontal stress becomes larger. The change of filling distance has a significant impact on the stress level in the bottom plate. (2) Within the load-bearing range of the column-and-pillar structure filling，the amount of top plate sinking is mainly determined by the filling body strength，while the bottom bulge is mainly determined by the filling distance. The overall relationship between filling body strength，filling distance，and top and bottom plate movements is represented by a quadratic parabolic surface. (3) Under the current working conditions，the maximum depth of the filling column under the bottom plate shear slip is 2.38 m，above which an elliptical shear failure plastic zone is produced，and below which a wavy tensile failure plastic zone is produced，ultimately penetrating the bottom plate of the two weak rock layers. The research results can provide a basis for the rational design of column-and-pillar structure filling.
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2023, Vol. 42 
