基于虚拟嵌固点法计算钢管桩稳定性研究

发布时间：2018-03-13 07:29

本文选题：钢管桩　切入点：桩周土开挖　出处：《建筑结构学报》2017年02期 　论文类型：期刊论文

【摘要】：既有建筑物增设地下空间时,需要采用桩基础支撑上部结构,才能开挖建筑物下的土体。随着桩周土体的减少,钢管桩的稳定性会相应降低。利用虚拟嵌固点法提出了桩入土深度部分处于嵌固、未嵌固和半嵌固三种状态下受压计算长度公式。在模型箱内利用杠杆加载的方式进行了钢管桩的受压稳定承载力试验,分析了不同直径、外露长度的钢管桩在改变入土深度过程中稳定性的变化规律,结果表明:随着桩入土深度的增加,桩的稳定系数趋近一定值,该深度即为临界入土深度;桩的临界入土深度与外露长度无关,但与桩的刚度有关,刚度较大的桩,其临界入土深度也相应增加。比较虚拟嵌固点法、试验和JTS 167-4—2012《港口工程桩基规范》中规定方法得到的稳定系数可知,规范方法计算值明显偏低,虚拟嵌固点法计算值与试验值比较接近。
[Abstract]:In order to excavate the soil under the building, the pile foundation should be used to support the superstructure when the underground space is added to the existing building. With the decrease of the soil around the pile, The stability of steel pipe pile will be reduced accordingly. The formulas for calculating the compression length of steel pipe piles under the three conditions of non-fixed and semi-embedded are calculated. The bearing capacity of steel pipe piles under compression is tested by means of lever loading in the model box, and the different diameters are analyzed. The variation law of stability of steel pipe pile with exposed length in the process of changing the depth of penetration shows that with the increase of the depth of the pile, the stability coefficient of the pile approaches a certain value, and the depth is the critical depth. The critical depth of the pile is independent of the exposed length, but it is related to the stiffness of the pile, and the critical depth of the pile with the larger stiffness increases accordingly. The stability coefficient obtained from the test and the method specified in JTS 167-4-2012 "Code for Port Engineering pile Foundation" shows that the calculated value of the code method is obviously lower, and the calculated value of the virtual fixed point method is close to the experimental value.
【作者单位】：山东建筑大学土木工程学院;山东省建筑结构鉴定加固与改造重点实验室;
【基金】：国家自然科学基金项目(51278286) 教育部长江学者和创新团队发展计划(IRT13075)
【分类号】：TU473.13

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