包裹碎石桩承载特性试验研究

发布时间：2018-05-06 11:54

本文选题：包裹碎石桩 + 模型试验　；参考：《岩土力学》2016年07期

【摘要】：为了研究包裹碎石桩的承载机制,开展了室内模型试验,对不同套筒长度和刚度的包裹碎石桩承载力、端阻力、变形和破坏情况等进行了分析。试验中利用自制的桩体径向变形测量仪监测了桩体的径向变形情况。试验结果表明:当桩体支承在坚硬土层时,全长包裹碎石桩有效提高碎石桩的承载力和刚度,且采用弹性模量较大的土工材料套筒,包裹碎石桩的极限承载力和刚度也较大,部分包裹碎石桩(包裹长度为0.6倍桩长)相对于碎石桩优势不明显。这是因为部分包裹碎石桩和全长包裹的承载特性、变形特点和破坏模式均存在差异。全长包裹碎石桩传递至桩底端的荷载大于部分包裹碎石桩和碎石桩的。与部分包裹碎石桩和碎石桩比较,全长包裹碎石桩桩身变形分布较为均匀,同一应力作用下,桩身最大径向变形量较小。此外,全长包裹碎石桩刺入顶部褥垫层发生破坏,而部分包裹碎石桩发生鼓胀破坏。
[Abstract]:In order to study the bearing mechanism of the macadam pile, an indoor model test was carried out. The bearing capacity, end resistance, deformation and failure of the macadam pile with different sleeve length and stiffness were analyzed. The radial deformation of pile is monitored by the self-made radial deformation measuring instrument. The test results show that when the pile is supported in the hard soil, the bearing capacity and stiffness of the macadam pile are improved effectively, and the ultimate bearing capacity and stiffness of the macadam pile are also larger by using the geo-material sleeve with higher elastic modulus. The advantage of partially wrapped macadam (0.6 times length of pile) is not obvious compared with macadam. This is due to the difference of loading characteristics, deformation characteristics and failure modes between partially wrapped macadam piles and full-length packages. The load from the whole-length macadam pile to the bottom end of the pile is larger than that of partially wrapped macadam pile and macadam pile. Compared with some macadam piles and crushed stone piles, the deformation distribution of full-length macadam piles is more uniform, and the maximum radial deformation of pile body is smaller under the same stress. In addition, the whole-length macadam pile impinges into the top cushion to destroy, while some of the macadam piles are bulged and destroyed.
【作者单位】：西南交通大学土木工程学院;广西建筑科学研究设计院;
【基金】：国防基础科研计划(No.B0220133003)~~
【分类号】：TU473.1

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