| 微型钢管桩用于岩石基坑支护的作用机制分析 |
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| 引用本文： | 刘小丽,李白.微型钢管桩用于岩石基坑支护的作用机制分析[J].岩土力学,2012,33(Z1):217-222. |
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| 作者姓名： | 刘小丽 李白 |
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| 作者单位： | 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 |
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| 基金项目： | 国家自然科学基金资助(No.40702044);山东省自然科学基金资助(No.ZR2009FQ028) |
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| 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。
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| 关 键 词： | 微型钢管桩 岩石基坑 喷锚支护 数值模拟 |
| 收稿时间： | 2012-05-10 |
Analysis of supporting mechanism of micro-steel-pipe piles in rock foundation pit |
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| LIU Xiao-li,LI Bai.Analysis of supporting mechanism of micro-steel-pipe piles in rock foundation pit[J].Rock and Soil Mechanics,2012,33(Z1):217-222. |
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| Authors: | LIU Xiao-li LI Bai |
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| Institution: | 1. College of Environmental Science and Engineering, Ocean University of China, Qingdao, Shandong 266100, China; 2. Key Laboratory of Marine Environment and Ecology of Ministry of Education, Ocean University of China, Qingdao, Shandong 266100, China |
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| 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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| Keywords: | micro-steel-pipe piles rock foundation pit shotcrete and rock bolt support numerical simulation |
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