土工织物散体桩复合地基路堤土拱效应研究

发布时间：2018-03-30 01:38

本文选题：土工织物散体桩　切入点：复合地基　出处：《长江科学院院报》2017年02期

【摘要】：为研究土拱织物散体桩的土拱效应,采用三维有限元软件建立了路堤荷载下土工织物散体桩复合地基模型,分析了筋材刚度、桩间距和路堤高度3个主要因素的影响。结果表明:土工织物散体桩的起拱筋土模量比为20,当筋土模量比达到67后,筋土模量比对土拱效应影响不大;土拱高度在路堤高度达到5倍桩净间距之前呈线性增长,之后土拱高度将不随路堤高度变化;随着桩净间距增加,形成完全土拱所需的高度也在增大,当桩净间距达到2倍桩径后,土拱高度将不再变化;随着路堤高度的增加,土拱率逐渐减小,当路堤高度达到1.7倍桩净间距形成完全土拱后,土拱率不再发生变化;与数值计算结果对比发现,由Hewlett和Randolph提出的三维土拱计算方法与数值计算结果最为接近,建议采用这种方法进行设计。
[Abstract]:In order to study the soil arch effect of soil arch fabric bulk pile, a composite foundation model of geotextile bulk pile under embankment loading was established by using 3D finite element software, and the stiffness of reinforced material was analyzed. The results show that the ratio of soil to soil modulus of geotextile bulk pile is 20, when the ratio of reinforced soil to soil modulus reaches 67, the ratio of reinforcement to soil modulus has little effect on the effect of soil arch. The soil arch height increases linearly before the embankment height reaches 5 times the net pile spacing, and then the soil arch height does not change with the embankment height, and with the increase of the net pile spacing, the required height to form the complete soil arch also increases. When the net spacing of piles reaches 2 times the diameter of piles, the soil arch height will not change, with the increase of embankment height, the ratio of soil arch will decrease gradually, when the net distance of pile reaches 1.7 times, the ratio of soil arch will not change. Compared with the numerical results, it is found that the three-dimensional soil arch calculation method proposed by Hewlett and Randolph is the closest to the numerical results, and it is suggested that this method be used to design the soil arch.
【作者单位】：同济大学地下建筑与工程系;中交第一公路勘察设计研究院有限公司;新疆维吾尔自治区交通规划勘察设计研究院;上海长凯岩土工程有限公司;
【基金】：国家自然科学基金项目(41572266) 云南省交通运输厅科技项目(云交科2015(A)12)
【分类号】：U416.12

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