高铁荷载下桩承式路基动力响应及土拱效应研究

doi:10.16285/j.rsm.2019.2030

岩土力学 ›› 2020, Vol. 41 ›› Issue (9): 3119-3130.doi: 10.16285/j.rsm.2019.2030

高铁荷载下桩承式路基动力响应及土拱效应研究

庄妍^{1, 2}，李劭邦³，崔晓艳^{1, 2}，董晓强⁴，王康宇⁵

1. 东南大学混凝土及预应力混凝土结构教育部重点实验室，江苏南京 211189；2. 东南大学土木工程学院，江苏南京 211189；3. 河海大学土木与交通学院，江苏南京 210098；4. 太原理工大学土木工程学院，山西太原 030024；5. 浙江工业大学建筑工程学院，浙江杭州 310023

收稿日期:2019-12-01 修回日期:2020-06-23 出版日期:2020-09-11 发布日期:2020-10-22
通讯作者: 崔晓艳，女，1989年生，博士，助理研究员，主要进行桩承式加筋路堤中土拱效应的研究。E-mail：cui19890213@126.com E-mail:Joanna_zhuang@163.com
作者简介:庄妍，女，1982年生，博士，教授，博士生导师，主要从事土拱效应、交通岩土、软基处理、边坡工程和海洋岩土等方面的研究。
基金资助:
国家自然科学基金优秀青年科学基金项目（No.51922029）；江苏高校优势学科建设工程资助项目（No.1105007138）；中央高校基本科研业务费专项资金资助（No.2242020K40102）。

Investigation on dynamic response of subgrade and soil arching effect in piled embankment under high-speed railway loading

ZHUANG Yan^{1, 2}, LI Shao-bang³, CUI Xiao-yan^{1, 2}, DONG Xiao-qiang⁴, WANG Kang-yu⁵

1. Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 211189, China; 2. School of Civil Engineering, Southeast University, Nanjing 211189, China; 3. College of Civil and Transportation Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 4. College of Civil Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China; 5. School of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou, Zhejiang 310023, China

Received:2019-12-01 Revised:2020-06-23 Online:2020-09-11 Published:2020-10-22
Supported by:
This work was supported by the National Science Fund for Excellent Young Scholars of China (51922029), the Priority Academic Program Development of Jiangsu Higher Education Institutions (1105007138) and the Fundamental Research Funds for the Central Universities (2242020K40102).

摘要/Abstract

摘要： 土拱效应的作用机制是桩承式路堤荷载传递的关键性技术问题，然而高铁荷载作用下桩承式路堤中土拱效应的研究尚不充分。基于高铁设计规范的相关内容，建立了高铁荷载作用下桩承式路堤三维有限元分析模型，并采用已有研究结论验证了数值模型的正确性。根据该数值分析模型，首先分析了高铁荷载作用下路基的动力响应，研究了高铁荷载作用下道床和路堤不同位置处的竖向位移随时间的变化规律，以及路基中速度与加速度沿深度的分布规律。研究发现：道床和路堤表面处的竖向位移随时间变化呈倒“M”型周期变化，而路堤底部处呈“V”型周期变化；速度与加速度在路基深度范围内衰减了80%。通过变化桩间距、路堤高度以及路堤材料参数，分析其对高铁荷载作用下路堤应力和沉降发展规律的影响，进而分析其对土拱效应的影响。研究结果表明：动载作用下土拱效应依然存在，但有所减弱，动载峰值作用下减弱程度最大，谷值情况下有所恢复；桩间距和路堤高度对高铁荷载作用下桩承式路堤中土拱效应的影响较为明显，而路堤填料内摩擦角和剪胀角的影响则相对较小。

关键词: 桩承式路堤, 高速铁路, 土拱效应, 动力响应, 数值分析

Abstract: The mechanism of soil arching effect is the key technical problem for load transfer of pile supported embankment. However, the soil arching in pile supported embankment under high-speed railway load is not well investigated. Based on the code for design of high-speed railway, a three-dimensional finite element analysis model of pile supported reinforced embankment under high-speed railway load is established, and its correctness is verified by the existing research results. According to the numerical model, the dynamic response of subgrade under the high-speed railway load is analyzed, including the variation of vertical displacement with time at different depths of roadbed and embankment load, as well as the distribution of velocity and acceleration along the depth. The results show that the vertical displacement of the roadbed and the embankment surface changes with time in an inverted M shape periodically, while the embankment bottom changes in a V shape periodically. It is also found that the velocity and acceleration decrease by 80% along the depth of subgrade. Then, the influence of different factors including pile spacing, embankment height and the properties of the embankment fill on the stresses and settlements are comprehensively analyzed. Hence, the soil arching effect in piled embankment under high-speed railway loading can be investigated. It shows that the soil arching effect remains valid but weakened under the dynamic loading, which weakens the maximum under the peak load, while restores under the valley load. Also it is found that the influences of pile spacing and embankment height are obvious on soil arching effect under dynamic loading, while the effects of friction angle and dilatancy angle of embankment fill are relatively small.

Key words: piled embankment, high speed railway, soil arching effect, dynamic response, numerical simulation

中图分类号:

TU 473

庄妍, 李劭邦, 崔晓艳, 董晓强, 王康宇, . 高铁荷载下桩承式路基动力响应及土拱效应研究[J]. 岩土力学, 2020, 41(9): 3119-3130.

ZHUANG Yan, LI Shao-bang, CUI Xiao-yan, DONG Xiao-qiang, WANG Kang-yu, . Investigation on dynamic response of subgrade and soil arching effect in piled embankment under high-speed railway loading[J]. Rock and Soil Mechanics, 2020, 41(9): 3119-3130.

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高铁荷载下桩承式路基动力响应及土拱效应研究

Investigation on dynamic response of subgrade and soil arching effect in piled embankment under high-speed railway loading

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