吉林大学学报(工学版) ›› 2024, Vol. 54 ›› Issue (6): 1730-1737.doi: 10.13229/j.cnki.jdxbgxb.20221067

• 交通运输工程·土木工程 • 上一篇    

高强格栅桩-网地基荷载传递桩-土应力特性

于跟社1,2(),商拥辉3(),徐林荣1,4   

  1. 1.中南大学 土木工程学院，长沙 410075
    2.中交机电工程局有限公司，北京 100088
    3.黄淮学院 建筑工程学院，驻马店 463000
    4.高速铁路建造技术国家工程实验室，长沙 410075
  • 收稿日期:2022-08-25 出版日期:2024-06-01 发布日期:2024-07-23
  • 通讯作者: 商拥辉 E-mail:yuer19213@163.com;syhbsh@csu.edu.com
  • 作者简介:于跟社（1972-），男，高级工程师，博士.研究方向：土木工程材料.E-mail：yuer19213@163.com
  • 基金资助:
    国家自然科学基金项目(42172322);河南省科技攻关重点研发项目(232102241040);湖南省教育厅科学研究项目优秀青年基金项目(21B0226);黄淮学院培育基金项目(XKPY-2022017);驻马店市重点研发专项项目(ZMDSZDZX20230066)

Stress features of piles-soils in load transfer of high-strength grid pile-net foundation

Gen-she YU1,2(),Yong-hui SHANG3(),Lin-rong XU1,4   

  1. 1.School of Civil Engineering，Central South University，Changsha 410075，China
    2.CCCC Mechanical and Electrical Engineering Bureau Co. ，Ltd. ，Beijing 100088 China
    3.Institute of Architecture and Engineering，Huanghuai University，Zhumadian 463000，China
    4.National Engineering Laboratory for High Speed Railway Construction，Changsha 410075，China
  • Received:2022-08-25 Online:2024-06-01 Published:2024-07-23
  • Contact: Yong-hui SHANG E-mail:yuer19213@163.com;syhbsh@csu.edu.com

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摘要：

为揭示高强格栅桩-网复合地基上部路堤荷载传递过程中桩-土应力的传递特性，依托某高铁高强格栅桩-网复合地基工程背景，建立了适合较小桩-土差异沉降桩-网复合地基荷载传递特性分析的修正土拱模型，并将理论计算桩-土应力比与现场测试结果进行对比，验证模型的合理性。结果表明：本文修正模型计算的桩-土应力比与现场测试结果吻合度高，验证了模型的可靠性；相同条件下，土拱效应影响范围随填土高度的增加呈变小趋势，拉膜特征值随桩-土差异沉降的增加呈指数增大；高强格栅因具有“拉膜架驭”效应，桩-土协同发挥承载功效在填筑期基本完成，最终稳定时桩-土应力比为3.8~4.0。同时，对比桩-土应力比与沉降随填筑荷载变化规律可知，前者对填筑荷载的敏感性略大于沉降，说明利用桩-土应力比可达到高铁路基控沉效果评估的目的。研究成果可为高速铁路桩-网复合地基精细化建造提供理论依据。

关键词: 高强格栅, 桩-土应力比, 桩-网复合地基, 荷载传递, 高速铁路

Abstract:

In order to reveal in depth the pile-soil stress transfer features of the upper embankment load transfer process of the high-strength grid pile-net composite foundation， relying on the background of the high-strength grid pile-net composite foundation engineering of a high-speed railway， a modified soil arch model suitable for the analysis of load transfer characteristics of small pile-soil differential settlement pile-net composite foundation was established， and the theoretically calculated pile-soil stress was compared with field test results to verify the rationality of the modified model. The results show that the revised model highly matches the field test results in calculating the pile-soil stress ratio， verifying the reliability of the model. Under the same conditions， the influence range of the soil arching effect decreases with the increase of the filling height， and the characteristic value of the tensile film increases exponentially with the increase of the pile-soil differential settlement. Under the effect of high-strength grille "pulling membrane to stand"， the pile-soil cooperative effect is basically completed during the filling period， and the rang of pile-soil stress ratio is 3.8~4.0 when it is stable. At the same time， by comparing the change rule of pile-soil stress ratio and settlement with the filling load， it can be seen that the former is slightly more sensitive to the filling load than the settlement， which shows that the pile-soil stress ratio can also be used to evaluate the effect of controlling the settlement of high railway foundation. The research results can provide theoretical basis for the fine construction of pile-net composite foundation of high-speed railway.

Key words: high-strength grille, pile-soil stress, pile-net foundation, load transfer, high-speed railway

中图分类号: 

  • TU470

图1

修正土拱模型"

图2

拉膜效应分析模型"

表1

土层物理力学参数"

参数黏土粉质黏土中砂砾砂
厚度/m1.27.52.0>20
重度/（kN?m -3 ）16.819.320.520.2
弹模/MPa7832.235.5
泊松比0.350.350.280.29
黏聚力/kPa15203.51.5
摩擦角/（°）12153335
测压系数0.550.550.450.4

图3

桩-网复合地基结构布置及测试图"

表2

理论计算参数"

类别计算参数
路堤填土

h=7.8 m； c=10 kPa； φ=30°；

Es=E0=10 MPa； γ=20 kN/m3

CFG桩d=0.5 m； B=1.0 m；
土工格栅Eg=300 kN/m

图4

竖向土压力沿深度分布"

图5

差异沉降对土拱高度的影响"

图6

土压力测试曲线"

图7

测试与计算结果对比"

图8

沉降测试曲线"

图9

桩-土应力比与沉降对比"

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