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建立了地下工程常用的U型钢支架、格栅钢架、空钢管支架与钢管混凝土支架的有限元模型,分析了各自的承载力、支护效应等力学性能及影响因素。通过研究材料用量和支护效应指标,对经济效益进行了对比分析。进行了钢管混凝土可缩性节点的设计及试验研究,分析了钢管混凝土节点的受力特性。研究表明:钢管混凝土支架支护性能与套箍系数密切相关。与传统支架相比,钢管混凝土支架承载力高,后期强度及延性大,规格多样,经济效益好。配以增阻可缩节点,可实现定量增阻,同时兼具让压功能。在优化分析组合效应的基础上,对钢管混凝土支架进行合理设计,可满足多种深部软岩及节理破碎岩体的支护要求。
The finite element models of U-shaped steel bracket, grid steel frame, hollow steel pipe bracket and concrete-filled steel tube bracket commonly used in underground engineering are established, and their mechanical properties and influencing factors such as bearing capacity and supporting effect are analyzed. Through the study of the amount of materials and support effects indicators, the comparative analysis of economic benefits. The design and experimental research of the concrete-filled steel tube concrete shrinkage was carried out, and the stress characteristics of the concrete filled steel tubular joints were analyzed. The results show that the supporting property of CFST supports is closely related to the coefficient of hoop. Compared with the traditional stent, the concrete-filled steel tube supports have high bearing capacity and large late strength and ductility, with various specifications and good economic returns. Coupled with the resistance can be reduced node, quantitative resistance can be achieved at the same time make pressure function. Based on the optimization and analysis of the combined effect, the reasonable design of CFST supports can meet the support requirements of many deep soft rock and jointed broken rock mass.