Numerical simulation of stoping sequence among ore block based on pressure arch theory
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Abstract:
Rational stoping sequence can effectively improve the stress distribution state of rock mass and ensure the stability of the stope. To determine a reasonable stoping sequence among ore block of Xingqiao Mine -300 m middle section, three schemes of stoping sequence among ore block were put forward according to mine existing conditions, including parallel stoping, Pin-pillar stoping and inverted Pin-pillar stoping, and by Midas finite element software, the numerical simulation models of the shemes were established. Considering the tensile stress, compressive stress and displacement, pressure arch theory was applied to analyze the simulation results. The results show that after the excavation of the ore body, the pressure arch will be formed around the goaf, and with the increase of the goaf, the outer boundary of the pressure arch moves to the deep part of the rock mass; during Pin-pillar stoping process, central part and both sides of goaf form a larger arch to bear its own and overlying rock load. The maximum tensile stress and compressive stress are respectively 2.288 MPa and 23.24 MPa with a maximum displacement of 55.71 mm, which are smaller than those of the other two options. In contrast, the program is more reasonable. The mining practice shows that the production process of Pin-pillar stoping sequence applied in the mine has achieved good economic and social benefits.
