预钻孔对邻近斜坡沉桩挤土影响分析

›› 2012, Vol. 33 ›› Issue (S2): 155-161预钻孔对邻近斜坡沉桩挤土影响分析.

预钻孔对邻近斜坡沉桩挤土影响分析

饶平平¹，李镜培^{2, 3}，张常光⁴

1.上海理工大学土木工程系，上海 200093；2. 同济大学岩土及地下工程教育部重点实验室，上海 200092； 3. 同济大学地下建筑与工程系，上海 200092；4. 长安大学建筑工程学院，西安 710061

收稿日期:2012-03-19 出版日期:2012-11-22 发布日期:2012-12-11
作者简介:饶平平，男，1984年生，博士，讲师，主要从事岩土及隧道工程施工环境效应的科研与教学工作
基金资助:
国家自然科学基金青年基金资助(No. 51208301)；上海理工大学博士科研启动经费资助项目(2011年)

Influence of prebored hole on soil-squeezing displacement for pile sinking adjacent to slope

RAO Ping-ping¹, LI Jing-pe^{i2, 3}, ZHANG Chang-guang⁴

1. Department of Civil Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 4. School of Civil Engineering, Chang'an University, Xi'an 710061, China

Received:2012-03-19 Online:2012-11-22 Published:2012-12-11

摘要/Abstract

摘要： 在沉桩位置处设置预钻孔是工程中减小扩孔挤土效应的常用有效措施。针对邻近斜坡的沉桩挤土问题，假定土体为线弹性模型，采用镜像方法，将桩体的贯入模拟为一系列球形孔连续扩张过程，在已有文献的基础上进一步推导出邻近斜坡设有预钻孔时的沉桩挤土位移表达式。结果表明，受斜边非轴对称位移边界的影响，远离斜边自由边界一侧的挤土位移不如靠近斜边自由边界一侧明显；斜边自由倾斜边界越陡（即参数越小），斜坡挤土位移越大；随着边界角度的增大，斜边倾斜边界对沉桩挤土位移的影响逐渐减弱；预钻孔的孔深和孔径对减小邻近斜坡沉桩挤土位移有较大的影响，二者的结合能更有效地减少挤土位移的范围和深度。

关键词: 预钻孔, 斜坡, 沉桩, 挤土位移, 镜像方法

Abstract: Prebored hole is an effective construction measure for reducing the squeezing effect of sinking-pile. For the problem of soil squeezing by sinking-pile adjacent to slope, it is assumed that the soil is the linear elastic constitutive model, The process of sinking-pile is simulated by a series of continuous spherical cavity expansion, Based on the mirror image method and present literatures, the soil squeezing displacement expression caused by pile sinking adjacent to slope is deduced which considers the influence of prebored hole. The results show that the soil compacting effects which far away from the hypotenuse free boundary side are not as obvious as the opposite side due to the influence of asymmetrical displacement boundary; the compacting effects become more obvious with the steeper of the hypotenuse free boundary; the influence of inclination boundary to the soil squeezing displacement would be gradually smaller with the increase of free inclination boundary angle; the aperture and hole-depth are important factors for the compacting effects of pile sinking adjacent to slope; combination of the aperture and hole-depth can effectively reduce the compacting effects. The results provide some reference value for engineering design.

Key words: prebored hole, slope, pile-sinking, soil-squeezing displacement, mirror image method

中图分类号:

TU473

饶平平，李镜培，张常光 . 预钻孔对邻近斜坡沉桩挤土影响分析[J]. , 2012, 33(S2): 155-161预钻孔对邻近斜坡沉桩挤土影响分析.

RAO Ping-ping , LI Jing-pei , ZHANG Chang-guang . Influence of prebored hole on soil-squeezing displacement for pile sinking adjacent to slope[J]. , 2012, 33(S2): 155-161预钻孔对邻近斜坡沉桩挤土影响分析.

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