高铁站场宽路基复合地基二维模型适用性分析

doi:10.13229/j.cnki.jdxbgxb20181130

Abstract

Abstract:

Three dimensional (3D) modeling of some complex pile composite foundations in high speed railway can be very complicated and time-consuming. So it is a common way to simplify 3D models into two dimensional (2D) models in current research, however, the applicability of different 2D modeling methods remains unclear. In this research, taking Ji'nanxi station in Beijng-Shanghai high speed railway as an example, five different 2D models are established to study their applicability by comparing the results of 2D models with that of 3D models and site measurement data. The study shows that 2D models can provide acceptable results for the development of settlements, stress of pile and soil, as well as lateral displacements. The method which remains the same elastic module and area replacement ratio yields the best results out of all 2D models. But a 3D model is necessary for the generation and dissipation of excess pore water pressures in foundation and bending moments of pile close to the toe of embankment, because 2D models give incorrect results.

Key words: highway and railway engineering, composite foundation, two dimensional model, settlement

CLC Number:

U213.1

Yang LI,Lian-jun WANG. Applicability analysis of two dimensional modelingmethods for wide embankment composite foundation in high speed railway stations[J].Journal of Jilin University(Engineering and Technology Edition), 2020, 50(2): 621-630.

Figures/Tables 18

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References 18

1	付贵海, 魏丽敏, 邓宗伟, 等. 桩筏复合结构加固高速铁路深厚软基长期性状的现场试验研究[J]. 中南大学学报: 自然科学版, 2017, 48(8): 2195-2202.
	Fu Gui-hai, Wei Li-min, Deng Zong-wei, et al. Field test on long-term behaviors of pile-raft composite structure strengthening high-speed railway deep ground[J]. Journal of Central South University (Science and Technology), 2017, 48(8): 2195-2202.
2	张峰, 刘莹, 许兆义, 等. 武广高铁CFG桩复合地基工后沉降影响因素[J]. 西南交通大学学报, 2015, 50(5): 783-788.
	Zhang Feng, Liu Ying, Xu Zhao-yi, et al. Factors influencing subgrade post-construction settlement of CFG Pile composite foundation in Wuhan-Guangzhou high-speed railway[J]. Journal of Southwest Jiaotong University, 2015, 50(5): 783-788.
3	沈宇鹏, 毛远凤, 荆鹏, 等. PHC 与CFG 桩复合地基在高速铁路基底中处理效果试验对比[J]. 岩石力学与工程学报, 2014, 33(增刊2): 4174-4180.
	Shen Yu-peng, Mao Yuan-feng, Jing Peng, et al. Experimental effect contrast between PHC and CFG pile-raft composite foundation in high speed railway base treatment[J]. Chinese Journal of Rock Mechanics and Engineering, 2014, 33(Sup.2): 4174-4180.
4	邵国霞, 苏谦, 尧俊凯. 加筋垫层与混凝土板加固管桩复合地基现场试验对比研究[C]∥第五届全国土工合成材料加筋土学术研讨会, 成都, 2015: 271-279.
5	郑一峰, 毛健, 梁世忠, 等. 高填土场地考虑土体固结的桩基负摩阻力[J]. 吉林大学学报: 工学版, 2017, 47(4): 1075-1081.
	Zheng Yi-feng, Mao Jian, Liang Shi-zhong, et al. Negative skin friction of pile foundation considering soil consolidation in high fill site[J]. Journal of Jilin University (Engineering and Technology Edition), 2017, 47(4): 1075-1081.
6	古海东, 罗春红. 疏排桩-土钉墙组合支护基坑土拱效应模型试验[J]. 吉林大学学报: 工学版, 2018, 48(6): 1712-1724.
	Gu Hai-dong, Luo Chun-hong. Experiment on soil arching effect of pit supporting structure with scattered row piles and soil nail wall[J]. Journal of Jilin University (Engineering and Technology Edition), 2018, 48(6): 1712-1724.
7	胡玉明, 黄音, 古海东. 排桩支护结构内力与变形三维有限元数值分析[J]. 吉林大学学报: 工学版, 2016, 46(2): 445-450.
	Hu Yu-ming, Huang Yin, Gu Hai-dong. Three-dimensional finite element analysis of internal forces and displacement of scattered row piles[J]. Journal of Jilin University (Engineering and Technology Edition), 2016, 46(2): 445-450.
8	Zhang L, Goh S H, Liu H B. Seismic response of pile-raft-clay system subjected to a long-duration earthquake centrifuge test and finite element analysis[J]. Soil Dynamics and Earthquake Engineering, 2017, 92: 488-502.
9	Paravita S W, Daniel T. Analysis of piled raft foundation on soft soil using PLAXIS 2D[J]. Procedia Engineering, 2015, 125: 363-367.
10	Huang J, Han J. Two-dimensional parametric study of geosynthetic-reinforced column-supported embankments by coupled hydraulic and mechanical modeling[J]. Computers and Geotechnics, 2010, 37(5): 638-648.
11	曹文昭, 郑俊杰, 严勇. 桩承式变刚度加筋垫层复合地基数值模拟[J]. 岩土工程学报, 2017, 39(增刊2): 83-86.
	Cao Wen-zhao, Zheng Jun-jie, Yan Yong. Numerical simulation of composite foundation using pile-supported and geosynthetics-reinforced cushion with variable stiffness[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(Sup.2): 83-86.
12	李建国，白朝能. 路堤荷载下复合地基下卧层附加应力分布研究[J]. 铁道工程学报, 2017, 34(7): 24-29.
	Li Jian-guo, Bai Chao-neng. Research on the additional stress distribution of underlying stratum under embankment load[J]. Journal of Railway Engineering Society, 2017, 34(7): 24-29.
13	邓永锋, 洪振舜, 刘松玉, 等. 搅拌桩复合地基平面模拟的简化方法探讨[J]. 岩土力学, 2005, 26(增刊): 209-212.
	Deng Yong-feng, Hong Zhen-shun, Liu Song-yu. et al. A planar simplified method for three-dimension cement-soil mixing piles composite foundation with FEM numerical analysis[J]. Rock and Soil Mechanics, 2005, 26(Sup.): 209-212.
14	Chai J, Shen S, Ding W, et al. Numerical investigation of the failure of a building in Shanghai, China[J]. Computers and Geotechnics, 2014, 55: 482-493.
15	Chai J, Shresth S, Hino T, et al. 2D and 3D analyses of an embankment on clay improved by soil–cement columns[J]. Computers and Geotechnics, 2015, 68: 28-37.
16	栾光日, 王连俊, 李懿, 等. 高速铁路站场宽路堤复合地基沉降特性分析[J]. 铁道学报, 2014, 36(10): 95-101.
	Luan Guang-ri, Wang Lian-jun, Li Yi, et al. Research on settlement characteristics of wide embankment composite foundation of high-speed railway stations[J]. Journal of the China Railway Society, 2014, 36(10): 95-101.
17	国家铁路局. TB 10621—2014. 高速铁路设计规范[M]. 北京: 中国铁道出版社, 2014.
18	闫明礼. CFG桩复合地基技术及工程实践[M]. 2版. 北京: 中国水利水电出版社, 2006.

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方法	原桩型为CFG桩		原桩型为PHC桩
方法	d_w/m	E_w/GPa	d_w/m	E_w/GPa
恒定参数法	0.50	25.50	0.08	39.20
等弹性模量法	0.13	25.50	0.02	39.20
等桩径法	0.50	6.69	0.08	3.17
等抗压刚度法	0.50	3.77	0.08	5.15
等抗弯刚度法	0.50	2.11	0.08	0.81

材料名称	重度γ/（kN·m^-3）	弹性模量E/MPa	泊松比υ	粘聚力c/kPa	内摩擦角φ/（°）	渗透系数k/（cm·s^-1）
粉质粘土	19.5	15	0.31	45	18.5	8×10^-5
细砂	19.0	30	0.28	15	32.0	3×10^-3
粘土	19.5	21	0.35	40	21.0	2×10^-6
卵石	21.8	80	0.30	10	45.0	5×10^-3
碎石垫层	22.0	100	0.22	0	45.0	4×10^-1
筏板	25.0	30 000	0.15	-	-	-
桩（连续墙）	25.0	见表1	0.15	-	-	-

参数	值
弹性模量E/GPA	67
泊松比υ	0.33
厚度t/mm	5
耦合弹簧单位面积上刚度K/（N·m^-3）	2.3×10⁶
耦合弹簧内聚力c/kPa	0

方法	桩A/mm		桩B/mm
方法	桩顶	桩间土	桩顶	桩间土
恒定参数法	49.6	42.2	57.5	44.8
等弹性模量法	60.5	48.4	68.7	55.4
等桩径法	53.3	43.2	60.1	46.7
等抗压刚度法	52.0	45.2	62.9	47.3
等抗弯刚度法	57.2	44.2	63.6	48.2
三维模型	63.8	49.2	71.1	55.7
实测结果	60.4	52.2	74.6	61.2

方法	桩A			桩B
方法	桩顶应力/kPa	桩间土平均压力/kPa	桩土应力比	桩顶应力/kPa	桩间土平均压力/kPa	桩土应力比
实测	3 126.0	44.1	70.9	872.2	88.5	9.9
三维模型	3 282.3	35.1	93.5	921.1	93.8	9.8
恒定参数法	2 269.0	25.7	88.4	656.9	72.4	9.1
等弹性模量法	3 446.4	33.3	103.4	884.2	90.0	9.8
等桩径法	2 067.8	24.4	84.8	684.2	73.9	9.3
等抗压刚度法	2 378.0	28.2	84.2	732.1	78.9	9.3
等抗弯刚度法	2 171.2	29.5	73.7	704.8	81.1	8.7

Applicability analysis of two dimensional modelingmethods for wide embankment composite foundation in high speed railway stations

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