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| 空间效应下不规则深基坑的支护体系变形分析 |
| Support deformation of irregularly shaped deep foundation pit under spatial effect |
| 投稿时间：2019-12-13 |
| DOI： |
| 中文关键词: 不规则深基坑 支护体系 变形特性 空间效应 桩锚支护 双排桩支护 数值分析 |
| 英文关键词: irregularly shaped deep foundation pit support system deformation characteristics spatial effect pile-anchor support double-row pile support numerical analysis |
| 基金项目:国家自然科学基金资助项目(41867035). |
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| 中文摘要: |
| 以武汉市某工程的不规则深基坑为对象,运用ABAQUS有限元软件,建立无支护与有不同支护体系的基坑数值模型,研究支护体系的变形特性和空间效应分布规律,并将数值分析结果与实际监测数据进行比较以验证有限元模型的有效性,同时还对深基坑的整体稳定性进行了分析。结果表明:基坑大阳角部位产生最大变形,易失稳；阴角能有效抑制邻近区域土体位移的发展,有利于支护结构稳定；沿基坑长边方向,离角部越远,基坑土体位移量越大,至中部区域达到最大,空间效应也相应逐渐变弱,至中部基本消失；无内支撑时,支护桩桩顶水平位移最大,有内支撑时,接近桩身1/2处的水平位移最大；内支撑有减少桩身侧向位移的效果,对于桩身上半部分,内支撑能在一定程度上抑制基坑的空间效应;桩锚支护比双排桩支护更能有效提高基坑整体稳定性。 |
| 英文摘要: |
| Aimed at the irregularly shaped deep foundation pit of a project in Wuhan City, this paper built the numerical models of the foundation pit without support and with different support systems via ABAQUS finite element software. The support’s deformation characteristics and the spatial effect distribution were studied. Numerical analysis results were compared with actual monitoring data to verify the validity of the finite element models. Global stability of the deep foundation pit was also analyzed. The results show that the maximal deformation appears at the large external corner of the foundation pit and makes the soil easy to lose stability. The internal corner can effectively inhibit the development of soil displacement in adjacent areas, which is conducive to the stability of supporting structures. As getting further away from the corner along the long side of the foundation pit, the soil displacement gradually increases to the maximum in the middle, and the spatial effect also gradually weakens and almost disappears in the middle. The maximal horizontal displacement occurs at the supporting pile tip in the case of no internal support, and near the middle of the pile body in the case of internal support. Internal support can reduce the pile’s lateral displacement and restrain the spatial effect for the upper half pile to some extent. Pile-anchor support improves the global stability of the foundation pit more effectively than double-row pile support. |
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