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隧道建设（中英文） ›› 2019, Vol. 39 ›› Issue (9): 1461-1470.DOI: 10.3973/j.issn.2096-4498.2019.09.010

• 研究与探索 • 上一篇    下一篇

基于颗粒流的高填黄土明洞加筋减载数值模拟分析

姚玉相1， 李盛1, *， 马莉2， 王焕3， 王长丹4   

  1. (1. 兰州交通大学 道桥工程灾害防治技术国家地方联合工程实验室， 甘肃 兰州 730070； 2. 兰州工业学院土木工程学院， 甘肃 兰州 730050； 3. 中铁十四局集团有限公司， 山东 济南 250014； 4. 同济大学 道路与交通工程教育部重点实验室， 上海 201804)
  • 收稿日期:2019-04-01 出版日期:2019-09-20 发布日期:2019-09-25
  • 作者简介:姚玉相（1994—），男，甘肃白银人，兰州交通大学桥梁与隧道工程专业在读硕士，研究方向为地下空间工程。Email： 2298066581@qq.com。*通信作者: 李盛， Email： ligwin@126.com。
  • 基金资助:

    国家自然科学基金资助项目（51668036，51868041）； 甘肃省高等学校科学研究一般项目（2017A-111）

Numerical Simulation of Reinforcement Load Reduction for Highfilled Opencut Tunnel Based on Particle Flow

YAO Yuxiang1, LI Sheng1, *, MA Li2, WANG Huan3, WANG Changdan4   

  1. (1. National and Provincial Joint Engineering Laboratory of Road & Bridge Disaster Prevention and Control, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China; 2. College of Civil Engineering, Lanzhou Institute of Technology, Lanzhou 730050, Gansu, China; 3. China Railway 14th Bureau Group Co., Ltd., Jinan 250014, Shandong, China; 4. Key Laboratory of Road & Traffic Engineering, Ministry of Education, Tongji University, Shanghai 201804, China)
  • Received:2019-04-01 Online:2019-09-20 Published:2019-09-25

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摘要：

为研究高填黄土明洞加筋减载的荷载传递规律，采用颗粒流软件模拟高填黄土明洞加筋减载，通过分析洞顶竖向应力、颗粒竖向位移、颗粒间的接触力、格栅的竖向变形和孔隙率等细观参数的变化，从微观角度揭示土工格栅加筋减载明洞减载规律，并进一步研究土工格栅刚度和层数对洞顶减载效果的影响。结果表明： 1）土工格栅的竖向变形和颗粒竖向位移变化形式基本保持一致，格栅的变形依赖于洞顶内外土柱的沉降差； 2）在格栅所能承受的最大变形范围内，内外土柱负的沉降差越大，格栅的拉膜效应越显著，减载效果越好； 3）格栅的刚度和层数对其减载效果均有一定的影响，应根据实际填土高度和填土性质选择适宜刚度和层数的格栅进行减载。

关键词: 明洞, 加筋减载, 土工格栅, 颗粒流, 拉膜效应, 微观

Abstract:

The reinforcement load reduction law for highfilled opencut tunnel is simulated by particle flow code(PFC) software, the microscopic parameters variations of vertical stress on the top of opencut, vertical displacement of particles, contact force, vertical deformation of geogrid and porosity are analyzed. The law of reinforcement load reduction by geogrid is revealed from microscopic aspect, and the influence of intensity and layers of geogrid on unloading effect of top opencut tunnel are further studied. The numerical simulation results indicate that: (1) The vertical deformation of geogrid is consistent with that of particles; the deformation of geogrid depends on the settlement difference between the inner and outer soil column on tunnel roof. (2) Within the maximum deformation range that the grille can withstand, the larger the negative settlement difference between the inner and outer soil column, the more significant the tension membrane effect of the geogrid and the better the load reduction effect. (3) The stiffness and the number of layers of geogrid have a certain impact on its load reduction effect, which should be considered according to height of the filled soil and the nature of the filled soil.

Key words: opencut tunnel, reinforcement load reduction, geogrid, particle flow code(PFC), tension membrane effect, microcosmic viewpoin

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