|
|
|
| RESEARCH OF BEARING MECHANISM AND BEARING CAPACITY SOLUTION FOR BOREHOLE CAST-IN-PLACE PILE |
| GAO Zikun1，2，SHI Jianyong3 |
(1. School of Civil Engineering，Putian University，Putian，Fujian 351100，China；2. College of Water Conservancy and
Hydropower Engineering，Hohai University，Nanjing，Jiangsu 210098，China；3. Geotechnical Research Institute，
Hohai University，Nanjing，Jiangsu 210098，China) |
|
|
|
|
Abstract First of all，based on fast or slow-pouring of concrete and its bearing capacity analysis，quickly pour concrete generate upper limit of bearing capacity of pile foundation was argued under the same other conditions. Because of actual speed of the pouring of concrete for the construction is between the fast and slow of definition，its bearing capacity is somewhere between the two limits. Secondly，for fast pouring concrete，there is distribute pressure at soil-pile edge surface of flowing concrete. After solidification and upon reaching the design strength of bearing characteristics，the pressure value is directly related to the size of the normal distribution and this is used to define the boundary conditions of displacement and stress and deducing solving methods of this paper. Last，the theoretical solution is tested and verified by the measured data from a pile engineering. The research shows that computational results of the solutions coincide with the measured data.
|
|
|
|
|
|
| [1] POULOS H G，DAVIS E H. Pile foundation analysis and design[M]. New York：John Wiley and Sons，1980：6–9.
[2] 唐世栋，王永兴，叶真华. 饱和软土地基中群桩施工引起的超孔隙水压力[J]. 同济大学学报，2003，31(11)：1 290–1 294.(TANG Shidong，WANG Yongxing，YE Zhenhua. Excess pore water pressure caused by installing pile group in saturated soft soil[J]. Journal of Tongji University，2003，31(11)：1 290–1 294.(in Chinese))
[3] 高子坤，施建勇. 考虑桩体几何特征的压桩挤土效应理论解答研究[J]. 岩土工程学报，2010，32(6)：5 956–5 962.(GAO Zikun，SHI Jianyong. Theoretical solutions of soil-squeezing effect due to pile jacking considering geometrical characteristics of a pile[J]. Chinese Journal of Geotechnical Engineering，2010，32(6)：5 956–5 962.(in Chinese))
[4] 高子坤，施建勇. 沉桩挤土位移应力变分解和积分泛函收敛性分析[J]. 力学学报，2009，41(4)：555–562.(GAO Zikun，SHI Jianyong. Convergence of integral functional and variational solutions of displacement and stress of soil due to pile-driving[J]. Chinese Journal of Theoretical and Applied Mechanics，2009，41(4)：555–562.(in Chinese))
[5] CARTER J P，RANDOLPH M F，WROTH C P. Stress and pore pressure changes in clay during and after the expansion of cylindrical cavity[J]. International Journal for Numerical and Analytical Methods in Geomechanics，1979，3(4)：305–322.
[6] RANDOLPH M F，CARTER J P，WROTH C P. Driven piles in clay——the effects of installation and subsequent consolidation[J]. Géotechnique，1979，29(4)：361–393.
[7] 高子坤，施建勇. 饱和黏土中沉桩挤土形成超静孔压分布理论解答研究[J]. 岩土工程学报，2013，35(6)：1 109–1 114.(GAO Zikun，SHI Jianyong. Theoretical solutions of excess pore pressure distribution due to pile jacking in saturated clay[J]. Chinese Journal of Geotechnical Engineering，2013，35(6)：1 109–1 114.(in Chinese))
[8] 高子坤，施建勇. 饱和粘土中单桩桩周土空间轴对称固结解[J]. 岩土力学，2008，29(4)：979–982.(GAO Zikun，SHI Jianyong. Consolidation solution of soil around single-pile after pile sinking[J]. Rock and Soil Mechanics，2008，29(4)：979–982.(in Chinese))
[9] 陈 文. 饱和黏土中静压桩沉桩机理及挤土效应研究[硕士学位论文][D]. 南京：河海大学，1999.(CHEN Wen. Penetration and soil compaction effect of pile jacks in saturated clay[M. S. Thesis][D]. Nanjing：Hohai University，1999.(in Chinese))
[10] SAGASETA. Analysis of undrained soil deformation due to ground loss[J]. Geotechnique，1987，37(3)：301–320.
[11] SAGASETA. Prediction of ground movements due to pile- driving in clay[J]. Journal of Geotechnical and Geoenvironmental Engineering，2001，127(1)：55–66.
[12] 高子坤，施建勇. 散粒材料压缩模量修正及群桩基础稳定性研究[J]. 岩土力学，2013，34(8)：2 174–2 180.(GAO Zikun，SHI Jianyong. Research of constitutive relation of discrete material and stability of grouped piles foundation[J]. Rock and Soil Mechanics，2013，34(8)：2 174–2 180.(in Chinese))
[13] 高子坤，施建勇. 基于变分原理的静压沉桩挤土效应理论解答研究[J]. 岩土工程学报，2009，31(1)：52–58.(GAO Zikun，SHI Jianyong. Theoretical analysis of soil squeezing effect due to jacked piles based on variation principle[J]. Chinese Journal of Geotechnical Engineering，2009，31(1)：52–58.(in Chinese))
|
|
|
|
2015, Vol. 34 
