Computation of bearing capacity of strip footing on sand overlying soft clay soil

ZHAO Zhifeng,PENG Bangyang

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2017, Vol. 41 ›› Issue (03) : 171-174.

PDF(1417918 KB)
南京林业大学学报（自然科学版）
PDF(1417918 KB)
JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2017, Vol. 41 ›› Issue (03) : 171-174. DOI: 10.3969/j.issn.1000-2006.201602005

Computation of bearing capacity of strip footing on sand overlying soft clay soil

  • ZHAO Zhifeng,PENG Bangyang
Author information +
History +

Abstract

【Objective】 The analysis of the bearing capacity of a strip foundation under the circumstance of sand overlying soft clay can provide a reference to the design of shallow footing where weak subsoil exists. 【Method】A theoretical derivation method is applied on the basis of the spread projection model, and the computation formula of strip footing bearing capacity on sand overlying clay soil is derived according to the stress analysis of the sand element beneath the footing. 【Result】 For the convenience of calculation, the determined parameters in the formula are given. According to the analysis, factors such as footing width, the thickness of the sand layer, the shear strength of sand and clay and the spread angle of the load have an influence on the bearing capacity, and they are considered in the formula. To prove the effectiveness of the formula, the bearing capacities of centrifuge models in the classic articles are calculated by the derived formula. 【Conclusion】The comparison shows that the relative errors between the formula and centrifuge experimental tests are less than 10%, indicating that the formula can be applied in computing the bearing capacity of strip footing on sand overlying soft clay.

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations
ZHAO Zhifeng,PENG Bangyang. Computation of bearing capacity of strip footing on sand overlying soft clay soil[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2017, 41(03): 171-174 https://doi.org/10.3969/j.issn.1000-2006.201602005

References

[1] 沈珠江. 理论土力学[M]. 北京: 中国水利水电出版社, 2000.
[2] 孙翔, 刘新荣, 张永兴. 上硬下软双层地基有限元分析[J]. 重庆建筑大学学报, 2004, 26(4): 41-44. SUN X, LIU X R, ZHANG Y X. Analysis of the double layer sub-grade with rigid upper layer and soft lower layer by FEM[J]. Journal of Chongqing Jianzhu University, 2004, 26(4): 41-44.
[3] 秦会来, 黄茂松. 双层地基极限承载力的极限分析上限法[J]. 岩土工程学报, 2008, 30(4): 611-616. QIN H L, HUANG M S. Upper-bound method for calculating bearing capacity of strip footings on two-layer soils[J]. Chinese Journal of Geotechnical Engineering, 2008, 30(4): 611-616.
[4] 赵少飞, 栾茂田, 范庆来,等. 非均质地基承载力及破坏模式的FLAC数值分析[J]. 岩土力学, 2006, 27(11): 1909-1915. ZHAO S F, LUAN M T, FAN Q L, et al. FLAC-based numerical analyses of bearing capacity and failure mechanism of strip and circular footings on nonhomogeneous foundations[J]. Rock and Soil Mechanics, 2006, 27(11): 1909-1915.
[5] KENNY M J, ANDRAWES K Z. The bearing capacity of footings on a sand layer overlying soft clay[J]. Geotechnique, 1997, 47(2): 339-345.
[6] HANNA A M, MEYERHOF G G. Design charts for ultimate bearing capacity of foundations on sand overlying soft clay[J]. Canadian Geotechnical Journal, 1980, 17(2): 300-303.
[7] 中华人民共和国住房和城乡建设部GB 50007—2011建筑地基基础设计规范[S]. 北京: 中国建筑工业出版社, 2011.
[8] 赵志峰, 杨帆. 刚性下卧层对地基变形影响的计算方法[J]. 南京林业大学学报(自然科学版), 2014, 38(5): 139-142. DOI:10.3969/j.issn.1000-2006.2014.05.026. ZHAO Z F, YANG F. Convenient computation method of settlement considering the existence of rigid ground[J]. Journal of Nanjing Forestry University(Natural Sciences Edition), 2014, 38(5): 139-142.
[9] LEE K K, CASSIDY M J, RANDOLPH M F. Bearing capacity on sand overlying clay soils: experimental and finite element investigation of potential punch-through failure[J]. Geotechinque, 2013, 63(15): 1271-1284.
[10] LEE K K, RANDOLPH M F, CASSIDY M J. Bearing capacity on sand overlying clay soils: a simplified conceptual model[J]. Geotechinque, 2013, 63(15): 1285-1297.
[11] 黄朝煊, 袁文喜, 方咏来. K0≠1时基础软弱下卧层临界埋深的讨论[J]. 长江科学院院报, 2013, 30(1): 56-60. HUANG C X, YUAN W X, FANG Y L. Critical embedded depth of foundation’s weak substrata when K0≠1[J]. Journal of Yangtze River Scientific Research Institute, 2013, 30(1): 56-60.
[12] BURD H J, FRYDMAN S. Bearing capacity of plane-strain footings on layered soils[J]. Canadian Geotechnical Journal, 1997, 34(2): 241-253.
[13] 钱家欢, 殷宗泽. 土工原理与计算[M]. 北京: 中国水利水电出版社, 2000.
[14] MITSU O, JIRO T, TSUTOMU K. Centrifuge model tests on bearing capacity and deformation of sand layer overlying clay[J]. Soils and Foundations, 1997, 37(1): 73-88.
[15] MITSU O, JIRO T, TSUTOMU K. Bearing capacity predictions of sand overlying clay based on limit equilibrium methods[J]. Soils and Foundations, 1998, 38(1): 181-194.
PDF(1417918 KB)

Accesses

Citation

Detail
Sections
Recommended
The full text is translated into English by AI, aiming to facilitate reading and comprehension. The core content is subject to the explanation in Chinese.

Author

Reader

Reviewer

www.nldxb.njfu.edu.cn

Edited ＆ Published by Editorial Department of Nanjing Forestry University(Natural Sciences Edition)
Address： No.159 Longpan Road,Nanjing 210037 Jiangsu,P.R.China
E-mail ：xuebao@njfu.edu.cn , xuebao@njfu.com.cn
Telephone +86-25-85428247,85427076
Distributed by China International Book Trading Corporation P.O. Box 399, Beijing ,P.R. China

/

〈 〉