Bearing Characteristics of Pile Foundation Based on Mohr-Coulomb Criterion in Strongly Alkaline Marsh Area

FENG Zhong-ju; LI Tie; FENG Kai; DONG Yun-xiu; CHEN Hui-yun; HU Hai-bo

doi:10.11988/ckyyb.20190904

PDF(1472 KB)

Journal of Changjiang River Scientific Research Institute ›› 2020, Vol. 37 ›› Issue (11) : 74-80. DOI: 10.11988/ckyyb.20190904

ROCK-SOIL ENGINEERING

Bearing Characteristics of Pile Foundation Based on Mohr-Coulomb Criterion in Strongly Alkaline Marsh Area

FENG Zhong-ju¹, LI Tie¹, FENG Kai^1,2, DONG Yun-xiu^1,3, CHEN Hui-yun¹, HU Hai-bo¹

Author information +

History +

Abstract

A elastoplastic constitutive model based on Mohr-Coulomb criterion was constructed to explore the limit bearing characteristics of bridge pile foundation in strongly alkaline marsh area based on the transformation among strength, cohesion, and internal friction angle. First of all, the water curing strength and corrosion strength of pile foundation concrete were measured by field test and laboratory test. The internal chloride ion concentration of concrete was measured by EDS analysis and element analysis. The convection depth of chloride ions inside the concrete was determined by an indoor electron microscopy test. In subsequence, the concrete specimens in the corrosive alkaline environment are divided into the spalling zone, the corroded zone and the non-corroded zone. The relation between corrosion depth and post-corrosion strength of concrete exposed one year was calculated by formula. Results demonstrated that with the increase of ratio of corrosion thickness to diameter of uncorroded pile, the ultimate bearing capacity of the transverse axial direction of a single pile reduced gradually, but the reduction gradually attenuated. The increase of pile length helped little to the improvement of ultimate bearing capacity of single pile transversely. The vertical ultimate bearing capacity of single pile also decreased gradually, and such decline also slowed down. Within the same range of corrosion thickness, the reduction of vertical ultimate bearing capacity of large-diameter single pile was greater than that of small-diameter single pile.

Key words

pile foundations / ultimate bearing capacity / strongly alkaline marsh area / chloride ion / corrosion thickness / Mohr-Coulomb criterion / elastoplastic constitutive model

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

FENG Zhong-ju, LI Tie, FENG Kai, DONG Yun-xiu, CHEN Hui-yun, HU Hai-bo. Bearing Characteristics of Pile Foundation Based on Mohr-Coulomb Criterion in Strongly Alkaline Marsh Area[J]. Journal of Changjiang River Scientific Research Institute. 2020, 37(11): 74-80 https://doi.org/10.11988/ckyyb.20190904

References

[1] 冯忠居.特殊地区基础工程[M].北京:人民交通出版社,2008.
[2] 冯忠居,成超,王廷武,等.荒漠极干旱区板块状盐渍土微结构变化对其强度特性的影响分析[J].岩土工程学报,2011,33(7):1142-1145.
[3] 乌延玲,冯忠居,王廷武,等.极度干旱区板块状盐渍土路用性能试验[J].长安大学学报(自然科学版),2011,31(1):31-35.
[4] 冯忠居,乌延玲,成超,等.板块状盐渍土的盐溶和盐胀特性研究[J].岩土工程学报,2010,32(9):1439-1442.
[5] 冯忠居,李维洲,王廷武,等.新疆板块状盐渍土工程特性[J].交通运输工程学报,2010,10(6):1-8.
[6] 冯忠居,胡海波,王富春,等.高海拔强盐沼泽区桥梁桩基损伤现场模拟试验[J].交通运输工程学报,2019,19(3):46-57.
[7] 姚贤华,冯忠居,管俊峰,等.不同掺合料对盐碱腐蚀条件下干湿循环后混凝土性能的影响[J].工业建筑,2018,48(3):6-10,30.
[8] 姚贤华,冯忠居,王富春,等.复合盐浸下多元外掺剂-混凝土抗干湿-冻融循环性能[J].复合材料学报,2018,35(3):690-698.
[9] 余红发,孙伟,王甲春,等.盐湖地区的环境条件与混凝土和钢筋混凝土结构的耐久性[J].工业建筑,2003(3):1-4,10.
[10]冯忠居,陈思晓,徐浩,等.基于灰色系统理论的高寒盐沼泽区混凝土耐久性评估[J].交通运输工程学报,2018,18(6):18-26.
[11]蒋卫东,尹正风,闫俊,等.宁夏盐渍地区混凝土破坏模式与防治研究[J].混凝土,2006(6):18-21,25.
[12]王富春,姚贤华,冯忠居,等.盐沼泽腐蚀对公路桥梁桩基础竖向极限承载力影响的数值模拟研究[J].公路,2017,62(1):60-66.
[13]马希和,平树江,蔡长松,等.海水环境中钢筋混凝土桥桩耐久性数值模拟研究[J].混凝土,2004(7):19-23.
[14]辛建平,郑颖人,唐晓松.基于弹塑性模型的微型抗滑桩破坏机制研究[J].岩石力学与工程学报,2014,33(增刊2):4113-4121.
[15]COLLEPARDI M, MARCIALIS A, TURRIZIANI R. Penetration of Chloride Ions into Cement Pastes and Concretes[J]. Journal of the American Ceramic Society, 1972, 55(10): 534.
[16]HOBBS D W. Aggregate Influence on Chloride Ion Diffusion into Concrete[J]. Cement and Concrete Research, 1999, 29(12): 1995.
[17]张立明,余红发,刘福明,等.暴露和浸泡混凝土氯离子结合能力相关性研究[J].硅酸盐通报,2017,36(6):1835-1840.
[18]闫长旺,李杰,张菊,等.西部氯盐渍土介质中混凝土的氯离子扩散性[J].功能材料,2016,47(2):2060-2066.
[19]岳著文,李镜培,杨博.考虑对流条件下氯离子在混凝土中的输运计算[J].同济大学学报(自然科学版),2015,43(1):60-66,81.
[20]张奕.氯离子在混凝土中的输运机理研究[D].杭州:浙江大学,2008.
[21]王传坤,高祥杰,赵羽习,等.混凝土表层氯离子含量峰值分布和对流区深度[J].硅酸盐通报,2010,29(2):262.
[22]向发海.氯离子在混凝土中的传输机理研究[D].长沙:中南大学,2011.
[23]张立明,余红发,何忠茂.盐湖地区混凝土的氯离子扩散性[J].中南大学学报(自然科学版),2011,42(6):1752-1755.
[24]乔頔,夏文俊,赵阳,等.连云港盐渍土中混凝土耐久性研究[J].岩土工程学报,2010,32(增刊2):611-614.
[25]陈萌,刘立新,彭少民.预拌混凝土各龄期抗拉和抗压强度换算关系试验研究[J].建筑结构,2010,40(2):109-111.
[26]冯忠居,胡海波,董芸秀,等.超大直径空心独立复合桩的竖向承载力计算方法[J].raybet体育在线院报,2019,36(12):91-95.
[27]王晓谋.基础工程[M].北京:人民交通出版社,2010.