平衡试桩法在变电站工程嵌岩桩承载力测试中的应用研究
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摘要
为探究变电站工程中小直径、低承载力嵌岩桩的竖向承载特性,获得合理的自平衡法转换系数。依托安徽芜湖3个500kV变电站工程,进行4根单桩竖向抗压静载试验与4根自平衡法试验。将静载试验成果与自平衡法试验成果进行对比分析,结果表明:变电站工程中嵌岩桩Q-s曲线为缓变形,承载力取值按位移控制,自平衡法适用于变电站工程中嵌岩桩承载力测试,嵌岩桩的自平衡转换系数为0. 89,自平衡试桩法可在变电站工程中推广应用。
To study the vertical bearing characteristics of small diameter and low-capacity rock-socketed piles in substation engineering,obtain a reasonable self-balanced conversion coefficient. Based on the Wuhu-Ⅲ 500 kV substation project in Anhui Province,the vertical bearing test of four piles and the self-balanced static load test of four piles were carried out.The test results of the heaped method are compared with the equivalent conversion results of the self-balanced method. The results show that the Q-s curve of rock-socketed piles in substation engineering is slow deformation and the bearing capacity is controlled by displacement. The self-balanced method is suitable for substation engineering and the equivalent conversion coefficient for this kind of rock-socketed piles is 0. 89,the self-balanced static loading test can be promoted and applied in substation engineering.
To study the vertical bearing characteristics of small diameter and low-capacity rock-socketed piles in substation engineering,obtain a reasonable self-balanced conversion coefficient. Based on the Wuhu-Ⅲ 500 kV substation project in Anhui Province,the vertical bearing test of four piles and the self-balanced static load test of four piles were carried out.The test results of the heaped method are compared with the equivalent conversion results of the self-balanced method. The results show that the Q-s curve of rock-socketed piles in substation engineering is slow deformation and the bearing capacity is controlled by displacement. The self-balanced method is suitable for substation engineering and the equivalent conversion coefficient for this kind of rock-socketed piles is 0. 89,the self-balanced static loading test can be promoted and applied in substation engineering.
引文
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[2]龚维明，戴国亮，蒋永生，等.桩承载力自平衡测试理论与实践[J].建筑结构学报，2002,23(1):82-88.
[3]龚维明，戴国亮，宋晖.大直径深长嵌岩桩承载机理研究与应用[M].北京:人民交通出版社，2010.
[4]建筑桩基技术规范:JGJ 94—2008[S].北京:中国建筑工业出版社，2008.
[5]中交公路规划设计院有限公司.公路桥涵地基与基础设计规范:JTG D63—2007[S].北京:人民交通出版社，2007.
[6]张琦，刘军，戴国亮，等.大直径嵌岩桩桩端极限承载力计算方法[J].东南大学学报(自然科学版)，2018,48(1):118-124.
[7]王卫东，吴江斌，聂书博.武汉绿地中心大厦大直径嵌岩桩现场试验研究[J].岩土工程学报，2015,37(11):1945-1954.
[8]龚成中，何春林，龚维明，等.基于自平衡试桩法大直径嵌岩桩尺寸效应分析[J].岩土力学，2012,33(8):2403-2407.
[9]王卫东，吴江斌，聂书博.武汉绿地中心大厦大直径嵌岩桩现场试验研究[J].岩土工程学报，2015,37(11):1945-1954.
[10]建筑基桩自平衡静载荷试验技术规程:JGJ/T 403—2017[M].北京:中国建筑工业出版社，2017.