基于3D打印的PC工法桩基坑围护结构变形特性模型试验研究

doi:10.13722/j.cnki.jrme.2022.0190

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (2185 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要 PC工法桩是将钢板桩与钢管桩通过锁口接头相互连接形成的新桩型，具有环境影响小、施工效率高、可回收等优点，可作为基坑围护结构。然而其支护机制尚缺乏深入的研究及试验佐证。基于相似原理，设计和开展无内支撑PC工法桩围护基坑开挖模型试验。模拟基坑开挖至围护结构变形失效的全过程，并对试验过程中模型桩的桩身应变、桩顶位移、地表沉降、桩侧土压力以及基坑外地基土变形进行实时测量和分析。钢管桩与钢板桩模型通过3D打印技术制作，试验在干砂地层进行。研究表明：随着基坑开挖至围护结构失效，基坑外地表沉降形态呈三角形沉降分布特点，PC工法桩后地基土体出现明显的土体滑动破坏面，与水平面最大夹角为59°；当开挖深度逐步增加，PC工法桩组合围护结构从各单桩相互独立的支护状态到逐渐成为整体式围护结构，钢管桩与钢板桩的变形均呈悬臂式位移形态，两者的桩身弯矩均呈“S”形分布。钢板桩与钢管桩的桩身弯矩之比近似等于其桩身抗弯刚度之比。为保证悬臂基坑开挖的安全性与经济性，建议PC工法桩的插入比 = 2～2.5。PC工法桩的凹凸状截面特性影响其墙侧土压力的分布形式，具体而言，当桩身变形较小时，支护侧PC工法桩凸出部分的土压力值大于凹处；当桩身挠度较大时，则凸出部分的土压力值小于凹处。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	韦实1
	梁荣柱1
	李忠超2
	陈峰军3
	邓成龙1
	吴小建1
	3
	孙廉威3

关键词 ：桩基础, PC工法桩, 3D打印技术, 围护结构, 模型试验, 基坑工程

Abstract：PC pile is an innovative pile consisted of steel pipe pile and steel sheet pile，and each individual pile are connected with each other via locking joints. PC pile has advantage of lower environmental impact，quick construction efficiency and recycle utilization，which was frequently applied as retaining structure in deep excavations. However，systematic studies of the deformation mechanism of the PC piles retaining structure in deep excavation are rarely reported and not well understood. In this study，a cantilevered excavation model test was designed and carried out according to the similarity principal. The whole excavation process from initial state to retaining structure failure was simulated in this experimental test. The strain of pile shaft，lateral displacement at the pile top，ground surface settlements，lateral earth pressure of pile shaft，the bending moment of the pile，displacement field behind PC pile were continuously measured during the whole process of excavation，respectively. The pipe pile models and sheet pile models were manufacture by using 3D printing technology. The excavation model test was conducted in dry sand. The experimental results show that，PC pipe model piles manufactured by the 3D printing have a good precision. During the whole process of excavation，a triangular settlement shape was observed at the ground surface. As excavation went deeper，an apparent slide failure plane appeared behind the PC piles，which is about 59 degrees to horizontal plane. When excavation depth increases，PC piles change from independent supporting state of each single pile gradually to an entire enclosure structure. A “S”shaped distribution of the bending moment was observed along the sheet piles and pipe piles shaft and the deflection of both piles were quite similar to cantilever beam subjected to distributed loads. The ratio of the bending moment between pipe pile and sheet pile is approximately equal to the ratio of the bending stiffness of two piles. In cantilevered excavation，the safe installation ratio of PC piles is suggested from 2 to 2.5. The sectional shape of the PC piles affects the distribution of the earth pressure against the wall. At supported side，the earth pressure on the protruding side of the PC piles retaining structure was larger than that on the denting side when the deformation of PC pile was small. The earth pressure at the protruding side was generally smaller than that on the denting side，when a large deflection occurs in PC piles.

Key words： pile foundation pipe-combination pile 3D printing technology retaining structure model test foundation pit engineering

引用本文:

韦实1，梁荣柱1，李忠超2，陈峰军3，邓成龙1，吴小建1，3，孙廉威3. 基于3D打印的PC工法桩基坑围护结构变形特性模型试验研究[J]. 岩石力学与工程学报, 2023, 42(S2): 4320-4332.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0190 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS2/4320

[5]	LIANG T，CONG S，XING W，et al. Finite element analysis of lateral earth pressure on sheet pile walls[J]. Engineering Geology，2018，244：146-158.
[9]	KIMURA M，INAZUMI S，TOO J，et al. Development and application of H-joint steel pipe sheet piles in construction of foundations for structures[J]. Soils and Foundations，2007，47(2)：237-251.
[15]	ZHANG M，MA J，YANG S，et al. Experimental study on bending moment of double-row steel pipe piles in foundation excavation[J]. Advances in Civil Engineering，2020，DOI：10.1155/2020/8882713.
[19]	CHENG X S，ZHENG G ，DIAO Y，HUANG T M, et al. Experimental study of the progressive collapse mechanism of excavations retained by cantilever piles[J]. Canadian Geotechnical Journal，2017，54(4)：574-587.
[1]	SCHMIEG H，VIELSACK P. Transmission of shear forces in sheet pile interlocks[J]. Journal of Geotechnical and Geoenvironmental Engineering，2002，128(4)：292-297.
[3]	MAWER R W，BYFIELD M P. Reduced modulus action in U-section steel sheet pile retaining walls[J]. Journal of Geotechnical and Geoenvironmental Engineering，2010，136(3)：439-444.
[11]	刘涛，陈允斌，刘浩. 滨海软土筑岛围堰超深基坑工程实例分析[J]. 岩土工程学报. 2012，34(增)：773-778.(LIU Tao，CHEN Yunbin，LIU Hao，Case study of ultra-deep foundation pit by island and cofferdam construction in soft soils in coastal areas[J]. Chinese Journal of Geotechnical Engineering，2012，24(Supp.)：773-778.(in Chinese))
[13]	王硕，杨彦军，岳祖润. 锁口钢管桩抗弯刚度折减行为及其影响因素分析[J]. 中南大学学报：自然科学版，2013，44(4)：1 551-1 556. (WANG Shuo，YANG Yanjun，YUE Zurun. Analysis of reduced modulus action and influence factors in steel pipe sheet piles[J]. Journal of Central South University：Science and Technology，2013，44(4)：1 551-1 556.(in Chinese))
[21]	中华人民共和国国家标准编写组. GB/T 50123—2019 土工试验方法标准[S]．北京：中国计划出版社，2019.(The National Standards Compilation Group of People?s Republic of China. GB/T 50123— 2019 Standard for geotechnical testing method[S]. Beijing：China Planning Press，2019.(in Chinese))
[23]	OU C Y，HSIEH P G，CHIOU D C. Characteristics of ground surface settlement during excavation[J]. Canadian Geotechnical Journal，1993，30(5)：758-767.
[25]	李连祥，符庆宏，黄佳佳. 砂土地基和粉质黏土地基基坑悬臂开挖离心模型试验[J]. 岩土力学，2018，39(2)：529-536.(LI Lianxiang，FU Qinghong，HUANG Jiajia. Centrifuge model tests on cantilever foundation pit engineering in sand ground and silty clay ground[J]. Rock and Soil Mechanics，2018，39(2)：529-536.(in Chinese))
[4]	TONG Z X，ZHOU S P，ZHENG R G，et al. Sectional shape effects of steel sheet pile walls on earth pressure by centrifuge model tests[C]// Underground Construction Tunneling. Shanghai：[s.n]，2014：601-609.
[7]	刘芳，张国庆，蒋明镜，等. 钢板桩挡墙主动土压力分布的形状效应[J]. 岩土力学，2012，33(增1)：315-320.(LIU Fang，ZHANG Guoqing，JIANG Mingjing，et al. Impact of sectional shape of steel sheet pile wall on active earth pressure[J]. Rock and Soil Mechanics，2012，33(Supp.1)：315-320.(in Chinese))
[8]	刘芳，刘春影，郑实，等.帽型钢板桩挡墙土压力分布离心模型试验[J]. 同济大学学报：自然科学版，2018，46(10)：1 341-1 347. (LIU Fang，LIU Chunying，ZHENG Shi，et al. Earth pressure against a hat-shaped sheet pile wall revealed by centrifuge modeling[J]. Journal of Tongji University：Natural Science，2018，46(10)： 1 341-1 347.(in Chinese))
[14]	韦实，邓成龙，梁荣柱，等. 基于3D打印的锁口钢管桩围护结构变形特性试验研究[J]. 岩石力学与工程学报，2020，39(增2)： 3 676-3 686.(WEI Shi，DENG Chenglong，LIANG Rongzhu，et al. Model testing on deformation characteristics of the locking steel pipe pile retaining structure by using 3D printing[J]. Chinese Journal of Rock Mechanics and Engineering，2020，39(Supp.2)：3 676-3 686. (in Chinese))
[17]	徐挺. 相似理论与模型试验[M]. 北京：中国农业机械出版社，1982：14-28.(XU Ting. The similarity theory and the model test[M]. Beijing：China Agricultural Mechanical Press，1982：14-28.(in Chinese))
[18]	黄大维，周顺华，冯青松，等. 盾构隧道与地层相互作用的模型试验设计[J]. 铁道学报，2018，40(6)：127-135.(HUANG Dawei，ZHOU Shunhua，FENG Qingsong，et al. Scaled model test design for interaction between shield tunnel and stratum[J]. Journal of the China Railway Society，2018，40(6)：127-135.(in Chinese))
[24]	MANA A I，CLOUGH G W. Predictions of movements for braced cuts in clay[J]. Journal of Geotechnical Engineering，1981，107(6)：759-777.
[27]	裴华富，殷建华，朱鸿鹄，等. 基于光纤光栅传感技术的边坡原位测斜及稳定性评估方法[J]. 岩石力学与工程学报，2010，29(8)： 1 570-1 576.(PEI Huafu，YIN Jianhua，ZHU Honghu，et al. Insitu monitoring of displacements and stability evaluation of slope based on Fiber Bragg Grating sensing technology[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(8)：1 570-1 576.(in Chinese))
[2]	BYFIELD M，MAWER R. Analysis of reduced modulus action in U-section steel sheet piles[J]. Journal of Constructional Steel Research，2004，60(3)：401-410.
[12]	王硕. 填海造陆地区钢管桩支护深基坑变形特性研究[硕士学位论文][D]. 石家庄：石家庄铁道学院，2010.(WANG Shuo. Deformation- property study of deep excavation supported by steel pipe sheet pile in sea reclamation areas[M. S. Thesis][D]. Shijiazhuang：Shijiazhuang Tiedao University，2010.(in Chinese))
[22]	芮瑞，吴端正，胡港，等. 模型试验中膜式土压力盒标定及其应用[J]. 岩土工程学报，2016，38(5)：837-845.(RUI Rui，WU Duanzheng，HU Gang，et al. Calibration tests on diaphragm-type pressure cells[J]. Chinese Journal of Geotechnical Engineering，2016，38(5)：837-845.(in Chinese))
[10]	ZHANG M Y，MA J X，YANG S J，et al. Experimental study on bending moment of double-row steel pipe pile in foundation excavation[J]. Advances in Civil Engineering，2020，28(10)：1-8.
[20]	GIBSON A D. Physical scale modeling of geotechnical structures at one-G[Ph. D. Thesis][D]. California：California Institute of Technology，1997.
[6]	张玉成，杨光华，姜燕，等. 软土地区双排钢板桩围堰支护结构的应用及探讨[J]. 岩土工程学报，2012，34(增1)：659-665. (ZHANG Yucheng，YANG Guanghua，JIANG Yan，et al. Application of retaining structure of steel sheet pile cofferdam in soft soil area[J]. Chinese Journal of Geotechnical Engineering，2012，34(Supp.1)： 659-665.(in Chinese))
[16]	梁荣柱，韦实，王新新，等. 内支撑式和悬臂式锁口钢管桩基坑围护结构变形对比试验分析[J]. 现代隧道技术，2022，59(3)：172-182.(LIANG Rongzhu，WEI Shi，WANG Xinxin，et al. Comparative test and analysis of the deformation in enclosure structure of internally-braced and cantilevered locked steel-pipe pile foundation pits[J]. Modern Tunnelling Technology，2022，59(3)：172-182.(in Chinese))
[26]	林鹏. 基于板桩墙支护的基坑开挖模型试验的三维数值分析及变形预测[硕士学位论文][D]. 南昌：华东交通大学，2008.(LIN Peng. Base on 3D numerical analysis of the sheet pile wall supporting modeland deformation predicting for deep foundation pit[M. S. Thesis][D]. Nanchang：East China Jiaotong University，2008.(in Chinese))