考虑桩体径竖向渗流的碎石桩复合地基固结解析解

郭彪; 龚晓南; 李亚军

doi:10.11779/CJGE201708016

考虑桩体径竖向渗流的碎石桩复合地基固结解析解 English Version

1. 云南省交通规划设计研究院陆地交通气象灾害防治技术国家工程实验室,云南昆明 650041;
2. 浙江大学滨海和城市岩土工程研究中心,浙江杭州 310027

基金项目: 云南省交通运输厅科技计划项目（2015（A）12）; 云南省交通运输厅科技计划项目(云交科教〔2014〕231号（一）)

详细信息

作者简介:
郭彪(1982- ),男,四川安岳人,博士,高级工程师,主要从事地基及边坡等方面的研究工作。E-mail: gb25891775@163.com。

计量
- 文章访问数: 291
- HTML全文浏览量: 5
- PDF下载量: 215
出版历程
- 收稿日期: 2016-04-11
- 发布日期: 2017-08-24

Analytical solution for consolidation of stone column-reinforced foundations considering radical and vertical flows in columns

1. National Engineering Laboratory for Land Transport Meteorological Disaster Control Technology, Broadvision Engineering Consultants, Kunming 650041, China;
2. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310027, China

摘要

摘要: 提出一种新的复合地基固结度求解方法及表达形式,推导得到了考虑桩体及土体的径竖向渗流,上部荷载分级逐渐施加,扰动区渗透系数呈线性变化等因素的一个较全面的散体材料桩复合地基固结解析解。通过退化、与已有解的比较等方法对解进行了分析验证。结果表明,现有的单级荷载及瞬时荷载下考虑桩体径竖向渗流的解、考虑桩体竖向渗流与变形协调的解、太沙基一维固结解等都是解的特例,这说明了解的正确合理性,发展和完善了现有复合地基固结理论。不考虑桩体径向渗流会高估地基固结速度;地基加载过程越缓,地基固结越慢。提出的求解方法,为复合地基固结度的求解提供了一种新的思路。
- 复合地基 /
- 固结 /
- 多级荷载 /
- 桩体渗流 /
- 解析解 /
- 求解方法
Abstract: Based on the proposed new method for solving consolidation degree of composite foundation and its expression, an analytical solution is obtained for the consolidation of composite ground with granular columns considering both radical and vertical flows in piles under multi-stage loading. In addition, the disturbance effect of column construction on the surrounding soil is also considered by introducing a linear function for the horizontal permeability coefficient of soils in the disturbed zone. The solution was analyzed by the degradation method and the comparison with the existing solutions. The results show that the obtained solution can be reduced to the solution considering both radical and vertical flows in piles under single-stage or instantaneous loading, the solution considering the coordination of vertical seepage and deformation of pile body, and the Terzaghi's one-dimensional consolidation solution for natural foundation. Thus, the correction and reasonability of the solution obtained is confirmed, and the solution does contribute to the development and improvement of the consolidation theory of composite ground. No consideration of the radial seepage in piles will overestimate the consolidation rate of the ground; the slower the foundation loading process is, the slower the consolidation of the foundation is. The proposed method provides a new idea for solving the consolidation degree of composite foundation.
- composite ground /
- consolidation /
- multi-stage loading /
- flow in column /
- analytical solution /
- solving method

HTML全文

参考文献(17)

[1]	YOSHIKUNI H. Design and control of construction in the vertical drain method[M]. Tokyo: Gihoudou, 1979.
[2]	HAN J, YE S L. Simplified method for consolidation rate of stone column reinforced foundations[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2001, 127(7): 597-603.
[3]	HAN J, YE S L. A theoretical solution for consolidation rates of stone column-reinforced foundations accounting for smear and well resistance effects[J]. The International Journal of Geomechanics, 2002, 2(2): 135-151.
[4]	王瑞春, 谢康和. 双层散体材料桩复合地基固结解析理论[J]. 岩土工程学报, 2001, 23(4): 418-422. (WANG Rui-chun, XIE Kang-he. Analytical theory for consolidation of double-layered composite ground with granular columns[J]. Chinese Journal of Geotechnical Engineering, 2001, 23(4): 418-422. (in Chinese))
[5]	王瑞春, 谢康和, 关山海. 变荷载下散体材料桩复合地基固结解析解.浙江大学学报(工学版), 2002, 36(1): 12-16. (WANG Rui-chun, XIE Kang-he, GUAN Shan-hai. Analytical solutions for consolidation of composite ground with granular columns under time-dependent loading[J]. Journal of Zhejiang University (Engineering Science), 2002, 36(1): 12-16. (in Chinese))
[6]	王瑞春, 谢康和, 唐晓武. 未打穿散体材料桩复合地基固结解析研究[J]. 公路交通科技, 2004, 21(6):12-16. (WANG Rui-chun, XIE Kang-he, TANG Xiao-wu. Analytical study on consolidation of composite ground with partially penetrated granular columns[J]. Journal of Highway and Transportation Research and Development, 2004, 21(6): 12-16. (in Chinese))
[7]	张玉国, 谢康和, 应宏伟, 等. 双面半透水边界的散体材料桩复合地基固结分析[J]. 岩土工程学报, 2005, 27(3): 304-307. (ZHANG Yu-guo, XIE Kang-he, YING Hong-wei, et al. Consolidation analysis of composite foundation of granular columns with impeded boundaries[J]. Chinese Journal of Geotechnical Engineering, 2005, 27(3): 304-307. (in Chinese))
[8]	ZHANG Y G, XIE K H, WANG Z. Consolidation analysis of composite ground improved by granular columns considering variation of permeability coefficient of soil[J]. Ground Modification and Seismic Mitigation, ASCE, Geotechnical Special Publication, 2006, GSP152: 135-142.
[9]	WALKER R, INDRARATNA B. Vertical drain consolidation with parabolic distribution of permeability in smear zone[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2006, 132(7): 937-941.
[10]	XIE Kang-he, LU Meng-meng, HU An-feng, et al. A general theoretical solution for the consolidation of a composite foundation[J]. Computers and Geotechnics. 2009, 36: 24-30.
[11]	XIE Kang-he, LU Meng-meng, LIU Gan-bin. Equal strain consolidation for stone columns reinforced foundation[J]. International Journal for Numerical and Analytical Methods in Geomechanics, 2009, 33:1721-1735.
[12]	赵明华, 刘敦平, 张玲. 考虑桩体固结变形的散体材料桩复合地基固结解析计算[J]. 岩土力学, 2010, 31(2): 483-488. (ZHAO Ming-hua, LIU Dun-ping, ZHANG Ling. Analytical solution for consolidation of composite ground with granular columns accounting for consolidation deformation of pile[J]. Rock and Soil Mechanics, 2010, 31(2): 483-488. (in Chinese))
[13]	邢皓枫, 龚晓南, 杨晓军. 碎石桩复合地基固结简化分析[J]. 岩土工程学报, 2005, 27(5): 521-524. (XING Hao-feng, GONG Xiao-nan, YANG Xiao-jun. Simplified analysis for consolidation of gravel-pile composite foundation[J]. Chinese Journal of Geotechnical Engineering, 2005, 27(5): 521-524. (in Chinese))
[14]	张玉国, 孙敏, 谢康和. 未打穿散体材料桩复合地基固结简化解研究[J]. 岩土力学, 2014, 35(5): 1303-1310. (ZHANG Yu-guo, SUN Min, XIE Kang-he. Study of simplifying solution to consolidation of composite ground with partially penetrated granular columns[J]. Rock and Soil Mechanics, 2014, 35(5): 1303-1310. (in Chinese))
[15]	卢萌盟, 谢康和, 刘干斌, 等. 考虑桩体固结和土体渗透性抛物线分布固结解[J]. 岩土工程学报, 2009, 31(7): 1069-1074. (LU Meng-meng, XIE Kang-he, LIU Gan-bin, et al. Solutions for consolidation considering column consolidation and parabolic distribution of soil permeability[J]. Chinese Journal of Geotechnical Engineering, 2009, 31(7): 1069-1074. (in Chinese))
[16]	LU Meng-meng, XIE Kang-he, GUO Biao. Consolidation theory for a composite foundation considering radial and vertical flows within the column and the variation of soil permeability within the disturbed soil zone[J]. Canadian Geotechnical Journal, 2010, 47: 207-217.
[17]	卢萌盟, 谢康和, 张玉国, 等. 考虑施工扰动和荷载效应的复合地基固结解[J]. 岩土工程学报, 2008, 30(4): 549-554. (LU Meng-meng, XIE Kang-he, ZHANG Yu-guo, et al. Theoretical solution for consolidation of composite foundations considering construction disturbance and loading effect[J]. Chinese Journal of Geotechnical Engineering, 2008, 30(4): 549-554. (in Chinese))