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为解决“U”型钢截面反拱梁在底鼓治理中出现的失稳破坏问题,建立了两铰反拱受力模型,利用弹性稳定理论求出两铰圆弧反拱稳定特征方程,求解出两铰反拱临界屈曲载荷解析解;并利用ANSYS建立“U”型钢反拱梁模型,模拟分析U25、U29和U36三种不同截面反拱梁在承受径向均布载荷条件下,反拱梁临界屈曲载荷和Mises应力与反拱圆心角之间的关系.结果表明:当反拱圆心角在70°时,三种“U”型钢截面反拱的临界屈曲载荷达到最大,随后加大圆心角则屈曲载荷平均以4.0%的速度缓慢下降,表明反拱梁在圆心角70°时稳定性较好,而Mises应力最大值则均出现在反拱梁的两端部和跨中底部,最小值出现在梁跨中上表面.设计的U36型钢反拱梁在淮南某矿石门处100 m试验段内的底板治理中得到成功应用,研究成果可为类似底板治理工程提供一定技术参考.
In order to solve the problem of instability failure of inverted arch beam with “U” steel section in bottom drum management, a two-hinged inverted arch stress model was established. According to elastic stability theory, The analytical solution of the critical buckling load of two-hinged inverted arch is obtained. The “U” shape steel inverted arch beam model is established by using ANSYS. The simulation analysis of the inverted arch beams with U25, U29 and U36 sections under radial uniform load , The relationship between the critical buckling load and the Mises stress of the inverted arch beam and the inverse arched central angle.The results show that the critical buckling load of the three kinds of “U” , And then increasing the center angle, the buckling load slowly decreases at an average rate of 4.0%, indicating that the stability of the inverted arch beam is better at the central angle of 70 °, while the maximum value of Mises stress appears at both ends of the inverted arch beam and And the minimum value appears in the middle and upper surface of the midspan of the mid-span, and the designed U36 steel inverted arch beam has been successfully applied to the floor slab treatment within the 100 m test section of an ore gate in Huainan. The research results can be used to provide similar floor slab treatment projects Technical reference.