[1]薛振年,陈国龙,孔维康,等.旋喷桩加固黄土隧道基底及仰拱数值模拟[J].西安科技大学学报,2018,(04):577-584.[doi:10.13800/j.cnki.xakjdxxb.2018.0409 ]
 XUE Zhen-nian,CHEN Guo-long,KONG Wei-kang,et al.Numerical simulation of jet grouting piles reinforcement in loess tunnel basement and inverted arch[J].Journal of Xi'an University of Science and Technology,2018,(04):577-584.[doi:10.13800/j.cnki.xakjdxxb.2018.0409 ]
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旋喷桩加固黄土隧道基底及仰拱数值模拟(/HTML)
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西安科技大学学报[ISSN:1672-9315/CN:61-1434/N]

卷:
期数:
2018年04期
页码:
577-584
栏目:
出版日期:
2018-07-15

文章信息/Info

Title:
Numerical simulation of jet grouting piles reinforcement in loess tunnel basement and inverted arch
文章编号:
1672-9315(2018)04-0577-08
作者:
薛振年1陈国龙2孔维康3王志丰3张 仲12
1.陕西省交通建设集团公司,陕西 西安 710064; 2.陕西省汉中公路管理局,陕西 汉中 723000; 3.长安大学 陕西省公路桥梁与隧道重点实验室,陕西 西安 710064
Author(s):
XUE Zhen-nian1CHEN Guo-long2KONG Wei-kang3WANG Zhi-Feng3ZHANG Zhong12
(1.Shaanxi Provincial Communication Construction Group,Xi'an 710075,China; 2.Hanzhong Highway Bureau of Shaanxi Province,Hanzhong 723000,China; 3.Shaanxi Provincial Major Laboratory for Highway Bridge and Tunnel,Chang'an University,Xi'an 710064,China)
关键词:
隧道工程 基底加固 数值模拟 旋喷桩 变形特征
Keywords:
tunnel engineering basement reinforcement numerical simulation jet grouting pile deformation characteristics
分类号:
U 455.91
DOI:
10.13800/j.cnki.xakjdxxb.2018.0409
文献标志码:
A
摘要:
应用MIDAS GTS NX软件数值模拟的方法,研究了旋喷桩群加固黄土隧道基底和仰拱效果,对有旋喷桩和无旋喷桩两种工况下,隧道基底、仰拱及拱顶变形量的差异,及旋喷桩地基加固段隧道仰拱不同施工阶段的内力和竖向变形进行分析,并与现场实测数据进行对比研究,发现采用旋喷桩加固隧道工况下时间t=22时仰拱最大隆起为5.62 cm,且沿深度方向围岩变形变化趋势平稳,变形均匀; 而无旋喷桩隧道在开挖后时间t=16时仰拱最大隆起15.9 cm,且沿竖直方向围岩变形剧烈减小,变形不均匀,与现场实测结果相比变化趋势无明显变化。研究结果表明:施加旋喷桩能够提高隧道地基的承载能力和稳定性,减小地基变形量; 隧底竖直旋喷桩可以改善隧道地基的土体工程力学性质,使其变形量在竖直方向随着深度的增加均匀减小,从而可以缓解隧道仰拱各部分的不均匀变形现象,防止了仰拱开裂破坏; 旋喷桩受力情况与隧道围岩地应力的大小有关,高地应力区域隧道开挖后要释放的应变能越多,旋喷桩就要产生越大的轴向力来抵抗围岩的竖向变形。
Abstract:
The effect of jet grouting pile on tunnel foundation and inverted arch in loess area was studied by the numerical simulation of the MIDAS GTS NX.This paper analyzed the deformation differences of tunnel basement、inverted arch and top of the arch under two construction conditions as jet grouting pile and non-jet grouting pile.It analyzed the internal forces and vertical deformation of tunnel inverted arch in different construction stages,and compared with the measured data of the field.It is pointed that the maximum uplift of the inverted arch under the condition of tunnel with jet grouting pile is 5.62 cm when the excavation time t=22,while the maximum uplift of the inverted arch without jet grouting pile is 15.9 cm at the time t=16 after excavation,compared with the field measurement results,the trend did not change significantly.The results indicate that applying the jet grouting pile can increase the bearing capacity and stability of the tunnel foundation and reduce its deformation.The vertical jet grouting pile at the bottom of the tunnel can improve the soil properties of the tunnel foundation so that the deformation of the tunnel can be reduced vertically along with the increase of the depth,which can alleviate the uneven deformation of each part of the tunnel arch and prevent arch cracking damage.Stress characteristics of jet grouting pile is related to the stress of tunnel surrounding rock.The more strain energy to be released after tunnel excavation in high ground stress region,the larger axial force should be produced by jet grouting pile to resist to the vertical deformation of the rock.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2018-01-10 责任编辑:李克永
基金项目:国家自然科学基金(41702287)
通信作者:陈国龙(1970-),男,陕西汉中人,高级工程师,E-mail: 424689213@qq.com
更新日期/Last Update: 2018-08-29