This paper introduces a novel High Bolt-Screw (HBS) active joint that enhances compressive and tensile support in deep subway foundation pits, improving the stability and safety of underground structures. The study provides a comprehensive analysis of the joint’s design, including its working principle, stiffness analysis, parameters, and strength verification. The HBS joint offers a unique design that significantly advances conventional support systems. A series of indoor axial loading tests on two HBS joints were conducted to quantify their load-bearing capacity and develop precise formulas for yield load and compression stiffness. The experiments produced extensive data, including load–displacement curves, load–strain curves, and ultimate failure modes. Numerical simulations yielded results closely matching the laboratory tests. Parametric studies were then carried out to assess how various design parameters affect joint performance. Key findings indicate that screw diameter, barrel nut height, and steel tube thickness significantly impact the HBS joint’s yield load and stiffness. Through parametric studies and numerical analysis, precise formulas were derived to calculate the joint’s yield load and initial compression stiffness. These findings highlight the HBS joint’s exceptional load-bearing capacity and stiffness, providing valuable insights for designing advanced support systems in subway foundation pits.

中文翻译：

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用于地铁开挖预应力内支撑的高螺栓-螺钉 （HBS） 活动节点的承载力


本文介绍了一种新型高螺杆 （HBS） 主动节，可增强地铁深基坑的压缩和拉伸支撑，提高地下结构的稳定性和安全性。该研究提供了对接头设计的全面分析，包括其工作原理、刚度分析、参数和强度验证。HBS 接头采用独特的设计，显著推动了传统支撑系统的进步。对两个 HBS 接头进行了一系列室内轴向载荷测试，以量化它们的承载能力并开发屈服载荷和压缩刚度的精确公式。实验产生了广泛的数据，包括载荷-位移曲线、载荷-应变曲线和最终失效模式。数值模拟产生的结果与实验室测试非常匹配。然后进行参数研究以评估各种设计参数如何影响接头性能。主要结果表明，螺钉直径、桶形螺母高度和钢管厚度会显着影响 HBS 接头的屈服载荷和刚度。通过参数研究和数值分析，推导出精确的公式来计算接头的屈服载荷和初始压缩刚度。这些发现突出了 HBS 节点卓越的承载能力和刚度，为设计地铁基坑中的高级支撑系统提供了有价值的见解。