型钢混凝土组合旋挖支护桩性能

型钢混凝土组合支护桩(劲性桩)是一种在混凝土灌注桩中配置型钢的支护桩体。旋挖钻孔灌注桩是一种被誉为“绿色施工工艺”的桩体施工工艺。将二者有机结合起来，不仅极大提高施工效率，因内置型钢，桩身承载能力也得到加强，在确保基坑开挖时基坑稳定问题的同时也符合绿色环保、产业化施工。本文为研究型钢混凝土组合桩的受力性能，对3个试件分别进行了拟静力试验，考察了劲性桩的承载力、变形能力，并采用ABAQUS软件对3个试件进行了非线性有限元数值分析，分析结果与试验值对比符合程度较好。再对型钢混凝土组合桩与旋挖成桩工艺的组合效果以及其施工流程简要描述，结合二者分析其施工技术与应用并得出其具有良好的社会和经济适用性，可参考利用于相应基坑支护工程中。

Experimental study on rotary drilling of steel reinforced concrete support piles in foundation pits

Steel reinforced concrete supporting pile (referred to stiff pile) is a kind of concrete pile configured with steel. Rotary drilling pile is honored as a Green Construction Technology. The organic combination of the two, not only greatly improves the efficiency of construction, but also strengthens the pile bearing capacity for the shape steel encased with. This way of construction, ensuring foundation pit stability in excavation, conforms to the green environmental protection and industrialization at the same time. Quasi-static tests were performed on 3 specimens to study the structural behavior of reinforced concrete pile with infill shape steel. Overall behaviors of the SRCSP such as bearing capacity, deformation capacity and ductility were inspected. The finite element analysis was conducted to simulate the load-deformation curves of the three specimens. The simulated and experimental results agree very well. Then this paper briefly describes the combined effect and construction process of the combination of SRCSP and rotating drill construction process. By analyzing the construction technology and application, good social and economic applicability is concluded, so the construction methods can be used in the corresponding foundation pit project for reference.