Analysis of supporting mechanism of micro-steel-pipe piles in rock foundation pit

LIU Xiao-li; LI Bai

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Analysis of supporting mechanism of micro-steel-pipe piles in rock foundation pit

更新时间：2026-06-25

- Analysis of supporting mechanism of micro-steel-pipe piles in rock foundation pit
- Vol. 33, Issue S1, (2012)
- 作者机构：
  
  1. 中国海洋大学环境科学与工程学院,山东,青岛,266100
  2. 中国海洋大学海洋环境与生态教育部重点实验室,山东,青岛,266100
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU473
- Online First：21 September 2012，
  
  Published：2012
- 稿件说明：
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LIU Xiao-li, LI Bai. Analysis of supporting mechanism of micro-steel-pipe piles in rock foundation pit[J]. 2012, 33(S1).
DOI：

LIU Xiao-li, LI Bai. Analysis of supporting mechanism of micro-steel-pipe piles in rock foundation pit[J]. 2012, 33(S1). DOI：

摘要

微型桩由于施工方便、快速在基坑工程中得到了广泛应用。以微型钢管桩-喷锚联合支护的岩石基坑工程为对象，通过数值模拟，分析微型钢管桩在岩石基坑支护中的作用机制。分析表明，当基坑地层中存在较厚的强风化岩层或性质较差的岩层时，设置在其中的微型钢管桩能有效地减小基坑水平位移，并合理调配预应力锚索的拉力，同时，微型钢管桩承受较大的弯矩和轴向压力，在设计中宜考虑微型钢管桩的有利作用，计算时应验算弯矩和轴向压力联合作用下微型钢管桩的安全性；设置在性质较好的中风化和微风化岩层中的微型钢管桩，对基坑作用很小，可考虑不设置微型钢管桩支护。

Abstract

Micro-piles have been widely used in excavations due to their convenience and simplicity in construction. Taking a certain rock foundation pit supported by combination of micro-steel-pipe piles and rock bolt support for example

supporting mechanism of the micro-steel-pipe piles is analyzed by numerical simulation. Analytical results have indicated that when thick strong weathering rock or weak rock layer exists

the micro-steel-pipe piles embedded in it can effectively decrease the horizontal displacements of the foundation pit and adjust the tension in the prestressed anchor cables; while the micro-piles can bear notable bending moment and axial compressive force. Micro-steel-pipe piles constructed in strong weathering rock layer should be considered for supporting structure design of the rock foundation pit

and capacity of the micro-piles under bending moment and compressive force should be verified. When the micro-steel-pipe piles were constructed in integrated and hard rock layers

such as intermediate or weak weathering rock layers

the micro-piles had hardly any effect on excavation of the foundation pit; so for this situation the micro-piles can be cancelled.

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