长期的荷载作用可能导致矿井井架变形和不均匀沉降,甚至可能引起结构整体倾覆。针对童亭煤矿钢结构单斜撑井架的沉降和受力特点,采用ANSYS有限元软件构建了单斜撑井架结构模型,研究了斜撑基础不均匀沉降对井架结构内力的影响规律,并对井架内力受不均匀沉降影响机理进行分析。结果表明:①立架与斜撑间的沉降差值会引起立架C柱底和顶部横梁的应力呈线性增加,对斜撑影响较小;X方向沉降率达到2.04‰时,立架最大应力出现于C柱底,约为148MPa,低于钢材设计强度的限值。②两斜撑基础间的不均匀沉降对单斜撑井架的不利影响更大,断绳工况下的Y方向沉降率为0.88‰时即发生应力超限破坏,略低于《矿山井架设计标准》中对单斜撑式钢井架斜撑基础间最大1‰的沉降差值限制。③不均匀沉降导致井架内力重分布,井架最大应力值和位移值均随沉降值增大而增大,其中立架C柱和斜撑上下天轮梁为最危险部位。针对井架沉降现状,提出了重点部位的加固和顶升方案,加固后井架内力和变形均大幅降低,静力性能提升30%。

Long-term load effects may cause deformation and uneven settlement of the mine derrick, and even leading to collapse of the structure.According to the settlement and stress characteristics of a steel structure single diagonal bracing derrick in Tongting Coal Mine, the structural model of the single diagonal bracing derrick was constructed with ANSYS. Influence law of the uneven settlement of the inclined brace foundation on the internal force of the derrick structure was studied, and the mechanism of the influence of the uneven settlement on the internal force of the derrick was analyzed. The results show that: The settlement difference between the vertical frame and the inclined brace will cause a linear increase in the stress of column C and top beams of the vertical frame, and has little effect on the inclined brace. When the settlement rate in the X direction reaches 2. 4‰, the maximum stress of the vertical frame appears at the bottom of column C with a value of MPa, which is below the permissible design strength limit for the steel material. ② The stress overrun failure occurs when the settlement rate in Y direction under the condition of rope breaking is 0. 88‰, which is slightly lower than the maximum settlement difference limit of 1‰ stipulated in Standard for Design of the Mine Headframes. ③The uneven settlement leads to a redistribution of internal forces in the derrick structure. The maximum stress and displacement of the derrick increase with the increase of the settlement value, and the column C of the vertical frame and the upper and lower head sheave beams of the inclined brace are identified as the most dangerous parts. In response to the current situation of the subsidence of the derrick, reinforcement and jacking plans for key parts was proposed. After reinforcement, the static performance of the derrick was enhanced by 30% with a significant reduction for the internal force and deformation.