黏性土中钻孔灌注桩自平衡转换系数取值研究
发布时间：2019-06-18 08:11
【摘要】：自平衡检测法在桩基检测中有效解决了传统静载法面临的许多问题,已得到广泛地推广和运用,其中自平衡法承载力计算中转换系数γ的取值是关键性问题之一。针对我国桥梁工程地基土质普遍存在黏性土的情况,依托台州湾项目工程,对黏性土中自平衡承载力测试法中的转换系数的取值进行了原位试验研究。选取3根钻孔灌注桩,桩径为1.5 m、桩长83.5 m,在原桩上先后进行自平衡法和堆载法试验,在桩身土层交界处布设钢筋计得到相应的桩侧摩阻力,将每根桩的上段桩在同一土层处自平衡法测的极限侧摩阻力值与堆载法测的极限侧摩阻力值进行对比,得到了各层土自平衡转换系数值,在该基础上收集了相似工程2根桩检测数据进行分析,结果表明在黏性土中钻孔灌注桩自平衡法与堆载法测得的上段桩极限摩阻力之比为0.7~0.8。
[Abstract]:The self-equilibrium detection method has effectively solved many problems faced by the traditional static load method in pile foundation detection, and has been widely popularized and applied, among which the value of conversion coefficient gamma in the calculation of bearing capacity of self-balance method is one of the key problems. In view of the widespread existence of clay in the foundation of bridge engineering in China, the value of conversion coefficient in the test method of self-equilibrium bearing capacity in clay is studied by in situ test with the support of Taizhou Bay Project. Three bored cast-in-place piles with diameter of 1.5 m and pile length of 83.5 m were selected. The self-balance method and pile load method were carried out on the original pile one after another. The corresponding pile side friction was obtained by placing steel bar meter at the junction of pile body and soil layer. The ultimate side friction measured by self-balancing method in the upper section of each pile in the same soil layer was compared with the limit side friction measured by heap load method, and the value of soil self-balance conversion coefficient in each layer was obtained. On this basis, the test data of two piles in similar projects are collected and analyzed. The results show that the ratio of maximum friction resistance of bored cast-in-place piles measured by self-balance method and stacking load method in clay is 0.7 鈮，
本文编号：2501303
[Abstract]:The self-equilibrium detection method has effectively solved many problems faced by the traditional static load method in pile foundation detection, and has been widely popularized and applied, among which the value of conversion coefficient gamma in the calculation of bearing capacity of self-balance method is one of the key problems. In view of the widespread existence of clay in the foundation of bridge engineering in China, the value of conversion coefficient in the test method of self-equilibrium bearing capacity in clay is studied by in situ test with the support of Taizhou Bay Project. Three bored cast-in-place piles with diameter of 1.5 m and pile length of 83.5 m were selected. The self-balance method and pile load method were carried out on the original pile one after another. The corresponding pile side friction was obtained by placing steel bar meter at the junction of pile body and soil layer. The ultimate side friction measured by self-balancing method in the upper section of each pile in the same soil layer was compared with the limit side friction measured by heap load method, and the value of soil self-balance conversion coefficient in each layer was obtained. On this basis, the test data of two piles in similar projects are collected and analyzed. The results show that the ratio of maximum friction resistance of bored cast-in-place piles measured by self-balance method and stacking load method in clay is 0.7 鈮，
本文编号：2501303
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