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| Evaluation method of bearing characteristics of uplift pile based on CPTU test |
| FENG Hualei1，LIU Dongming1，2，CAI Guojun1，3，DUAN Wei1，4 |
| (1. Institute of Geotechnical Engineering，Southeast University，Nanjing，Jiangsu 210096，China；2. Nanjing Qinhuai State Assets Holding Group Co.，Ltd.，Nanjing，Jiangsu 210096，China；3. School of Civil Engineering，Anhui Jianzhu University，Hefei，Anhui 230601，China；4. College of Civil Engineering，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China) |
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Abstract Uplift pile foundation is widely used in underground space in coastal areas. The uplift characteristics of structures are the engineering indices that must be evaluated. Many scholars have studied the prediction methods of the uplift bearing characteristics of pile foundation based on CPTU test，and proposed the empirical formula for specific site. These empirical formulas have great limitations when applied to local sites. Therefore，a method based on CPTU is proposed to predict the uplift bearing characteristics of pile foundation in soft soil layer in coastal areas. Model tests were carried out to study the influence of the length-to-diameter ratio of pile foundation and the roughness of pile surface on the bearing characteristics of the uplift pile. The mechanical mechanism of the uplift pile in the working process and the interaction mechanism between pile and soil were studied. The results of the model tests were further verified by numerical simulation analysis. The CPTU test was carried out in the model bucket. The empirical relationship between pile side friction resistance and CPTU test parameters was established. The empirical relationship proposed in this paper is applied to a soft soil engineering site in Wenzhou. The error between the uplift pile bearing capacity calculated by the proposed method and the measured results is only 7.7%，lower than other methods of calculation results. The calculation accuracy is higher and it has a high applicability in predicting the bearing characteristics of uplift pile in soft soil.
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[1] KOLK H J，BAAIJENS A E，SENDERS M. Design criteria for pipe piles in silica sands[C]// Proceedings of the 1st International Symposium on Frontiers in Offshore Geotechnics. London，UK：Taylor and Francis，2005：711–716.
[2] ZHANG L，SARGAN D S M. Tensile and compressive shaft capacity of piles in sand[J]. Journal of Geotechnical Engineering，1993，119(12)：403–405.
[3] LUNNE T，OWELL J J M，ROBERTSON P K. Cone penetration testing in geotechnical practice[M]. [S. l.]：CRC Press，2002：222–247.
[4] LIAO T，MAYNE P W. Stratigraphic delineation by three-dimensional clustering of piezocone data[J]. Georisk：Assessment and Management of Risk for Engineered Systems and Geohazards，2007，1(2)：102–119.
[5] ESLAMI A，FELLENIUS B H. CPT and CPTu data for soil profile interpretation：review of methods and a proposed new approach[J]. Iranian Journal of Science and Technology Transaction B- Engineering，2004，28：69–86.
[6] CHATTOPADHAYA B C. Uplift capacity of plies in sand[J]. Journal of Geotechnical Engineering，1986，112(9)：888–904.
[7] SHANKER K，BASUDHAR P K，PATRA N R. Uplift capacity of single piles：predictions and performance[J]. Geotechnical and Geological Engineering，2007，25(2)：151–161.
[8] FAIZI K，ARMAGHANI D J，SOHAEI H，et al. Deformation model of sand around short piles under pullout test[J]. Measurement，2015，63：110–119.
[9] REDDY K M，AYPTHIRAMAN R. Experimental studies on behavior of single pile under combined uplift and lateral loading[J]. Journal of Geotechnical and Geoenvironmental Engineering，2015，141(7)：04015030.
[10] CLAUSEN C, AAS P M，KARLSRUD K. Bearing capacity of driven piles in sand，the NGI approach[C]// Proceedings of International Symposium. on Frontiers in Offshore Geotechnics. Perth：[s. n.]，2005：22–47.
[11] TOMLINSON M J，PEAKER K. Discussion：some pile loading tests in stiff clay[J]. Canadian Geotechnical Journal，1964，1(3)：179–180.
[12] ABOLFAZL ESLAMI B H F. Pile capacity by direct CPT and CPTu methods applied to 102 case histories[J]. Canadian Geotechnical Journal，1997，34(6)：886–904.
[13] SAMORODOV A V，SEDIN V L，KROTOV O V，et al. Procedure for assigning a soil deformation modulus of large-sized slab and slab-pile foundations bases[J]. Soil Mechanics and Foundation Engineering，2019，56(3)：340–345.
[14] ALMEIDA M S，FA D，LUNNE T. Use of the piezocone test to predict the axial capacity of driven and jacked piles in clay[J]. Canadian Geotechnical Journal，1996，33(1)：23–41.
[15] RANDOLPH M F，MURPHY B S. Shaft capacity of driven piles in clay[C]// Offshore Technology Conference. [S. l.]：[s. n.]，1985：371–378.
[16] KIM D，CHUNG M，KWAK K. Resistance factor calculations for LRFD of axially loaded driven piles in sands[J]. KSCE Journal of Civil Engineering，2011，15(7)：1 185–1 196.
[17] ESLAMI A，FELLENIUS B H. Pile capacity by direct CPT and CPTu methods applied to 102 case histories[J]. Canadian Geotechnical Journal，1997，34(6)：886–904.
[18] MILLER G A，LUTENEGGER A J. Influence of pile plugging on skin friction in overconsolidated clay[J]. Journal of Geotechnical and Geoenvironmental Engineering，1997，123(6)：525–533.
[19] TOGLIANI G. Pile capacity prediction using CPT—case history[C]// Proceedings of the 2nd International Symposium on Cone Penetration Testing. [S. l.]：[s. n.]，2010：3–13.
[20] TOMLINSON M J，PEAKER K. Discussion：some pile loading tests in stiff clay[J]. Canadian Geotechnical Journal，1964，1(3)：179–180.
[21] DOHERTY P，GAVIN K. Pile aging in cohesive soils[J]. Journal of Geotechnical and Geoenvironmental Engineering，2013，139(9)： 1 620–1 624.
[22] PATRIZI P，BURLAND J. Development in the design of driven piles in clay in terms of effective stresses[J]. Rivista ltaliana di Geotecnica，2001，35(3)：35–49.
[23] TAKESUE K，SASAO H，MATSUMOTO T. Correlation between ultimate pile skin friction and CPT data[J]. Geotechnical Site Characterization，1998，(2)：1 177–1 182.
[24] ALMEIDA M S，DANZIGER F A，LUNNE T. Use of the piezocone test to predict the axial capacity of driven and jacked piles in clay[J]. Canadian Geotechnical Journal，1996，33(1)：23–41.
[25] 中华人民共和国行业标准编写组. JGJ 106—2014 建筑基桩检测技术规范[M]. 北京：中国建筑工业出版社，2002.(The Professional Standards Compilation Group of People?s Republic of China. JGJ 106—2014 Technical specification for testing of building foundation pile[M]. Beijing：China Architecture and Building Press，2002.(in Chinese))
[26] SINHA A，HANNA A M. 3D numerical model for piled raft foundation[J]. International Journal of Geomechanics，2017，17(2)：04016055.
[27] 李 飞，杨俊杰，宋 琦，等. 多层土地基扩底抗拔桩离散元颗粒流研究[J]. 中南大学学报：自然科学版，2019，50(11)：2 859–2 869.(LI Fei，YANG Junjie，SONG Qi，et al. Study on discrete element particle flow of multi-layered ground-based expanded bottom uplift pile[J]. Journal of Central South University：Science and Technology，2019，50(11)：2 859–2 869.(in Chinese))
[28] 蔡国军，刘松玉. 基于CPTU测试的桩基承载力预测新方法[J]. 岩土工程学报，2010，32(增2)：479–482.(CAI Guojun，LIU Songyu. A new method of pile bearing capacity prediction based on CPTU test[J]. Chinese Journal of Geotechnical Engineering，2010，32(Supp.2)：479–482.(in Chinese))
[29] 刘松玉 蔡国军. 现代多功能CPTU技术理论与工程应用(精)[M]. 北京：科学出版社，2013：312–326.(LIU Songyu，CAI Guojun. Modern multi-function cptu technology theory and engineering application(Jing)[M]. Beijing：Science Press，2013：312–326.(in Chinese))
[30] 段 伟，蔡国军，刘松玉. 基于CPTU状态参数的无黏性土最大剪切模量评价方法[J]. 西南交通大学学报，2019，54(4)：801–807.(DUAN Wei，CAI Guojun，LIU Songyu. Evaluation method of maximum shear modulus of cohesionless soil based on state parameters from piezocone penteration test[J]. Journal of Southwest Jiaotong University，2019，54(4)：801–807.(in Chinese))
[31] 耿功巧，陈 妍，蔡国军，等. 基于CPTU原位测试的深基坑工程中黏性土静止土压力系数的评价研究[J]. 工程勘察，2019，47(9)：1–6.(GENG Gongqiao，CHEN Yan，CAI Guojun，et al. Evaluation of static earth pressure coefficient of clay soil in deep foundation pit based on CPTU in-situ test[J]. Engineering Survey，2019，47(9)： 1–6.(in Chinese))
[32] CAI G，LIU S，PUPPALA A J，et al. Interpretation of soil classification from CPTU data in recent clay deposits in Jiangsu Province of China[C]// Transportation Research Board Meeting. [S. l.]：[s. n.]， 2010：27–34.
[33] 陈瑞锋，蔡国军，刘松玉，等. 多功能数字式无线CPTU测试技术与工程应用研究[J]. 工程勘察，2019，47(8)：1–10.(CHEN Ruifeng，CAI Guojun，LIU Songyu，et al. Study on multi-function digital cordless CPTU testing technique and engineering application[J]. Engineering Investigation and Survey，2019，47(8)：1–10.(in Chinese))
[34] 王 蒙，蔡国军，刘文亮，等. 基于CPTU测试的高速公路改扩建新老地基土工程特性评价研究[J]. 岩土工程学报，2019，41(增2)：81–84.(WANG Meng，CAI Guojun，LIU Wenliang，et al. Engineering characteristics evaluation of new and old foundation soil for highway reconstruction and expansion based on CPTU test[J]. Chinese journal of geotechnical engineering，2019，41(Supp.2)：81–84.(in Chinese))
[35] 段 伟，蔡国军，刘松玉，等. 无黏性土的电阻率CPTU状态参数确定方法及其液化评价[J]. 交通运输工程学报，2019，19(2)：59–68.(DUAN Wei，CAI Guojun，LIU Songyu，et al. Determination of resistivity CPTU state Parameters and liquefaction evaluation of clayless soils[J]. Journal of Traffic and Transportation Engineering，2019，19(2)：59–68.(in Chinese))
[36] 中华人民共和国行业标准编写组. T/CCES 1—2017 孔压静力触探测试技术规程[S]. 北京：中国建筑工业出版社，2017.(The Professional Standards Compilation Group of People?s Republic of China. T/CCES 1—2017 Technical specification for pore pressure static contact detection test[S]. Beijing：China Architecture and Building Press，2017.(in Chinese))
[37] 李 星，王红雨，孙晓荣，等. 淤泥土与新填土接触面抗剪强度试验研究[J]. 地下空间与工程学报，2020，16(6)：1 665–1 671.(LI Xing，WANG Hongyu，SUN Xiaorong，et al. Experimental study on shear strength of contact surface between silt soil and new fill[J]. Journal of Underground Space and Engineering，2020，16(6)： 1 665–1 671.(in Chinese)) |
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2023, Vol. 42 
