| 魏应乐,马海龙.逆作微型钢管桩复合地基承载变形特性及应用[J].安徽建筑大学学报,2023,31(2):14-18，32 |
| 逆作微型钢管桩复合地基承载变形特性及应用 |
| Load-bearing Deformation Characteristics and Application of Reversed Micro Steel-pipe Pile Composite Foundation |
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| DOI： |
| 中文关键词: 盾构吊装 地下结构 数值模拟 |
| 英文关键词: shield hoisting underground structure numerical simulation |
| 基金项目:安徽省高校自然科学重点项目（KJ2019A0745）；安徽建筑大学校级博士启动基金项目（2019QDZ05） |
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| 中文摘要: |
| 采用粉喷桩加固的某软土地层上的 6 层住宅楼，由于沉降较大，出现较多裂缝而拆除重建，根据现场具体施工条件，决定采用逆作微型钢管桩对既有地基进行加固。为了分析钢管桩复合地基与粉喷桩复合地基的加固特性异同，地基土采用摩尔 - 库伦模型，桩采用弹性模型，计算两种复合地基。计算结果表明，粉喷桩复合地基压缩主要发生在加固区域的上部，粉喷桩不能有效将荷载传递到桩端，粉喷桩复合地基承载变形特性接近于天然地基。微型钢管桩复合地基压缩区域可达桩端下一倍桩长以下，钢管桩能有效将荷载传递到桩端，微型钢管桩复合地基承载变形特性接近桩基础。采用逆作微型钢管桩加固地基，解决了噪音、挤土问题，并保证了施工安全，经逆作钢管桩加固的住宅楼沉降很小。 |
| 英文摘要: |
| A 6-story residential building on the soft soil layer reinforced with powder-jetting piles needs to be demolished andreconstructed due to a large number of cracks causing by large settlements. According to the on-site condition，the reversed microsteel-pipe pile are used to reinforce the existing foundation. In order to analyze the similarities and differences of the reinforcementcharacteristics between the steel-pipe pile composite foundation and the powder-jetting pile composite foundation，the Mohr-Coulombmodel is adopted for the foundation soil and the elastic model for the pile to calculate these two composite foundations. The calculationresult shows that the compression of the powder-jetting pile composite foundation mainly occurs in the upper reinforcement zone；the powder-jetting pile can not effectively transfer the load to the pile tip；the bearing deformation characteristic of powder-jettingpile composite foundation is close to natural foundation. While the compression of the micro steel-pipe pile composite foundation canreach more than one pile length below the pile tip，the steel-pipe pile can effectively transfer the load to the pile tip and the bearingdeformation characteristic of powder-jetting pile composite foundation is close to pile foundation. Using the reversed micro steelpipe piles to reinforce the foundation solves the problem of noise and soil compaction，and ensures the safety of the construction. Thesettlement of the residential building reinforced by the reversed steel-pipe pile is small. |
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