【作者】 秦慧慧； 叶芳； 毛永平； 江锋； 寇钊； 周安；

【Author】 QIN Huihui;YE Fang;MAO Yongping;JIANG Feng;KOU Zhao;ZHOU An;School of Civil and Hydraulic Engineering, Hefei University of Technology;China United Engineering Co., Ltd.;Jianhua Building Materials Technology (Guangdong) Co., Ltd.;

【机构】 合肥工业大学土木与水利工程学院； 中国联合工程有限公司； 建华建材科技(广东)有限公司；

【摘要】 为探索开发离心钢管混凝土管桩(SC管桩)在深基坑支护工程中的应用,对3根SC管桩进行抗弯性能试验,其中2根做单调加载、1根做重复加载,分析该桩在弯矩作用下的抗弯承载能力、混凝土开裂弯矩及弯曲延性。研究表明:在直径、壁厚和混凝土强度等级均相同的情况下,与专用支护型预应力高强混凝土支护桩(GZH)相比,SC管桩抗弯承载力是其1.65～1.71倍,具有更好的抗弯承载能力;与普通PHC管桩相比,SC管桩抗弯承载力是其2.30～2.38倍,混凝土开裂弯矩是其3.18～3.75倍;与PHC管桩的脆性相比,SC桩具有良好的弯曲延性,延性系数不低于7.92,对基坑侧移变形具有较好的适应性;重复加载基本不影响SC管桩的抗弯性能,适合作为预制支护桩的重复使用。因此,SC管桩在深基坑支护工程中具有潜在的应用前景。更多还原

【Abstract】 To explore the application of centrifugal steel pipe concrete piles(SC piles) in deep foundation pit support engineering, three SC piles were subjected to flexural performance tests, including two under monotonic loading and one under cyclic loading. Their flexural bearing capacity, concrete cracking moment, and flexural ductility under bending moment were analyzed. The results show that, under the same conditions of diameter, wall thickness, and concrete strength grade, the flexural bearing capacity of SC piles is 1.65～1.71 times that of special support-type prestressed high-strength concrete piles(GZH).SC piles have better flexural bearing capacity than GZH. Compared with ordinary precast high-strength concrete piles(PHC), the flexural bearing capacity of SC piles is 2.30～2.38 times that of PHC piles,and the concrete cracking moment is 3.18～3.75 times that of PHC piles. In comparison with the brittleness of PHC piles,SC piles have good flexural ductility, with a ductility coefficient of no less than 7.92, and have good adaptability to the lateral deformation of foundation pit. Cyclic loading basically does not affect the flexural performance of SC piles and is suitable for the piles to be used repeatedly as precast support piles. Therefore, SC piles have potential application prospects in deep foundation pit support engineering.更多还原