To solve the problem that the overlapping parts of a retractable pier column are prone to damage, this paper proposed the reinforcing measure of setting a stiffener ring at the bottom of the steel pipe. To study how the stiffener-ring parameters influence the mechanical properties of the pier column, 12 scale model specimens (including nine specimens with stiffener-ring widths of 40, 50, and 60 mm and three unstiffened comparison specimens) were tested under axial compression. Based on the test results, the specimen load–displacement, load–deflection, and load–strain curves were analyzed, and a finite-element model of a pier column under axial compression was established to determine the optimal stiffener size. The results show that setting a stiffener ring enhances the cooperative working ability between the steel pipe and the internal filling material and restrains the lateral deformation of the pier column, thereby improving the ultimate bearing capacity and overall stability of the pier column. The ultimate bearing capacity of the pier column is related to the width and thickness of the stiffener ring. The optimal size of the stiffener ring of the model pier column is 70 mm in width and 4 mm in thickness. The present research results provide a reference for designing compressible pier columns and column stiffening in mines and have important practical significance.

为了解决伸缩墩柱的搭接部分容易损坏的问题，提出了在钢管底部设置加强环的加强措施。为了研究加劲环参数如何影响墩柱的力学性能，在轴向压缩下测试了12个比例模型样本（包括9个加劲环宽度分别为40、50和60 mm的样本以及3个未加劲的比较样本）。根据测试结果，分析了试样的荷载-位移，荷载-挠度和荷载-应变曲线，并建立了在轴向压缩下墩柱的有限元模型，以确定最佳的加劲肋尺寸。结果表明，设置加强筋环可以增强钢管与内部填充材料之间的协同工作能力，并抑制墩柱的横向变形，从而提高墩柱的极限承载力和整体稳定性。墩柱的极限承载力与加强环的宽度和厚度有关。模型墩柱的加劲环的最佳尺寸是宽度70毫米，厚度4毫米。研究成果为矿井中可压缩墩柱的设计和柱的加固提供了参考，具有重要的现实意义。墩柱的极限承载力与加强环的宽度和厚度有关。模型墩柱的加劲环的最佳尺寸是宽度70毫米，厚度4毫米。研究成果为矿井中可压缩墩柱的设计和柱的加固提供了参考，具有重要的现实意义。墩柱的极限承载力与加强环的宽度和厚度有关。模型墩柱的加劲环的最佳尺寸是宽度70毫米，厚度4毫米。研究成果为矿井中可压缩墩柱的设计和柱的加固提供了参考，具有重要的现实意义。