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[1]陆善佳,薛婷,王旭东,等.多运营模式下地铁的超静孔压分布特征与动力累积变形规律[J].南京工业大学学报(自然科学版),2013,35(05):94-99.[doi:10.3969/j.issn.1671-7627.2013.05.018]
 LU Shanjia,XUE Ting,WANG Xudong,et al.Distribution characteristics of excess pore water pressure and power cumulative settlement regularity of dynamic load under various operation modes of subway[J].Journal of NANJING TECH UNIVERSITY(NATURAL SCIENCE EDITION),2013,35(05):94-99.[doi:10.3969/j.issn.1671-7627.2013.05.018]
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多运营模式下地铁的超静孔压分布特征与动力累积变形规律()
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《南京工业大学学报(自然科学版)》[ISSN:1671-7627/CN:32-1670/N]

卷:
35
期数:
2013年05期
页码:
94-99
栏目:
出版日期:
2013-09-20

文章信息/Info

Title:
Distribution characteristics of excess pore water pressure and power cumulative settlement regularity of dynamic load under various operation modes of subway
文章编号:
1671-7627(2013)05-0094-06
作者:
陆善佳1薛婷2王旭东1张鹏1
1. 南京工业大学 岩土工程研究所,江苏 南京 210009; 2. 江苏华源建筑设计研究院股份有限公司,江苏 常州 213022
Author(s):
LU Shanjia1XUE Ting2WANG Xudong 1ZHANG Peng1
1. Institute of Geotechnical Engineering, Nanjing University of Technology, Nanjing 210009, China; 2. Jiangsu Hua Yuan Architecture Design Co. Ltd.,Changzhou 213022,China
关键词:
多运营模式 排水动力循环三轴试验 动力累积沉降 超静孔压
Keywords:
various operational modes drainage power cycle triaxial test power cumulative settlement excess pore water pressure
分类号:
TU443
DOI:
10.3969/j.issn.1671-7627.2013.05.018
文献标志码:
A
摘要:
以往地铁隧道沉陷研究主要局限于不排水条件下的洞周土体动强度和液化及累积塑性变形等方面,但对排水条件循环荷载下超静孔压和累积塑性变形研究不足。结合地铁的正常运营状况,针对南京地铁河西段粉砂土工程地质特点,开展排水条件下循环荷载三轴实验。在获得可靠的动参数和动变形基础上,运用GeoStudio有限元软件建立二维地基-隧道有限元模型,对地铁多运营模式下隧道地基土的排水条件循环荷载动力响应非线性分析,得到运行方式和运行速度等因素影响下隧道洞周位移和超静孔压的动力响应性状。结果表明:双向运行时隧道上方的竖向位移响应值小于单向运行时的竖向位移响应值。而洞周超静孔压与之相反; 列车运行速度为35 km/h的超静孔压响应值大于60 km/h的响应值,竖向位移无明显差异。列车低速产生的振动频率相对较低,能量衰减越慢,所以产生较大的超静孔压,与实测在规律上相符合。
Abstract:
The subsidence research of tunnel in the past was restricted to the dynamic strength, liquidation and cumulative plastic deformation of the soil around tunnel under the undrained condition. The studies on the excess pore water pressure and the cumulative plastic deformation under cyclic loading under the drainage conditions were not enough.Combined with the normal operating state of the subway and geological engineering characteristics of silty sands in Hexi area of Nanjing, triaxial tests under cyclic loading under the drainage conditions were carried out. On the basis of reliable parameters and dynamic deformation, a two-dimensional finite element model of subsoil-tunnel was established by the GeoStudio finite element software. Nonlinear analysis of dynamic response of subsoil under cyclic loading under the drainage condition was given. The characteristics of vibration responses of the subsoil displacement and excess pore water pressure were obtained in various operation modes, which were influenced by operational mode and operational speed and other factors. Results showed that the vertical displacement response above the tunnel during bi-directional running was less than that during one-way running, on the contrary, the response of excess pore water pressure around the hole during bi-directional running was greater than that during one-way running. The response value of excess pore water pressure at the speed of 35 km/h was greater than that at 60 km/h, while the vertical displacement was almost the same. When the train ran slowly, the vibration frequency was relatively low and the energy attenuated more slowly, thus producing a large excess pore water pressure. It was consistent with the actual measured conditions.

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备注/Memo

备注/Memo:
收稿日期:2012-10-31
基金项目:国家自然科学青年基金(41102178); 江苏六大人才建设基金(09-F-004)
作者简介:陆善佳(1988—),男,江苏盐城人,硕士生,主要研究方向为交通荷载作用下的软土地基沉降; 王旭东(联系人),教授,E-mail:cewxd@njut.edu.cn..
更新日期/Last Update: 2013-09-07