[1]罗刚,潘少康,张玉龙,等.双线盾构隧道下穿机场高速沉降及变形规律[J].长安大学学报(自然科学版),2019,39(04):100-108.
　LUO Gang,PAN Shao kang,ZHANG Yu long,et al.Settlement and deformation law of a doubletrack shield tunnel underpass airport expressway[J].Journal of Chang’an University (Natural Science Edition),2019,39(04):100-108.
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双线盾构隧道下穿机场高速沉降及变形规律()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第39卷
期数:
2019年04期
页码:
100-108
栏目:
道路工程
出版日期:
2019-07-15

文章信息/Info

Title:
Settlement and deformation law of a doubletrack shield tunnel underpass airport expressway
作者:
罗刚; 潘少康; 张玉龙; 陈亮
(1. 长安大学 公路学院，陕西 西安 710064； 2. 长沙理工大学 土木与建筑学院，湖南 长沙 410114； 3. 广西交通投资集团有限公司，广西 南宁 530022)
Author(s):
LUO Gang1;  PAN Shaokang1;  ZHANG Yulong1;  CHEN Liang2; 3
(1. School of Highway, Changan University, Xian 710064, Shaanxi, China; 2. School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan, China; 3. Guangxi Communications Investment Group Co., Ltd., Nanning 530022, Guangxi, China)
关键词:
隧道工程; 盾构隧道; 下穿机场高速; 数值模拟; Peck公式; 沉降变形规律
Keywords:
tunnel engineering;  shield tunnel;  underpass airport expressway;  numerical simulation;  Peck formula;  low of deformation and settlement
文献标志码:
A
摘要:
为了研究双线盾构隧道近距离下穿既有高速公路时，对高速公路路面和路堑边坡稳定性的影响，论证盾构下穿工法的可行性，以西安北客站—西安咸阳国际机场城际轨道项目盾构隧道下穿机场高速公路施工为研究对象，对高速公路路堑边坡、路面及隧道结构的变形规律进行研究。采用叠加的Peck公式计算了双线盾构隧道下穿引起地表沉降的规律，引入《地铁设计规范》（GB 50157—2013）（下文简称规范）中地铁隧道衬砌结构径向直径变形率的概念，对隧道水平和竖向的直径变形率进行计算，进一步通过有限差分软件FLAC3D对双线盾构隧道下穿施工过程进行三维数值模拟，分别研究高速公路路堑边坡、路面及隧道结构的变形规律。研究结果表明：路面最大沉降出现在右线掘进至机场高速公路正下方时的南侧坡脚，其值为6.2 mm；边坡的最大沉降为7 mm，出现在双线盾构隧道中间的正上方；双线盾构隧道贯通后，结构的最大竖向位移和最大水平位移分别为14.86、12.25 mm，隧道衬砌结构的水平和竖向直径变形率分别为0.20%、0.24%，两者较接近且满足规范要求。根据机场高速公路路面的位移控制限值，此次盾构施工法满足路面的变形要求，所得的计算结果为该区间的盾构隧道施工提供了参考，亦可对类似的近接工程施工起到借鉴作用。
Abstract:
To analyze the impact of expressway pavement and the stability of a cutting slope when constructing a shield tunnel under an expressway and determining the feasibility of the shield construction method, the construction of the shield tunnel under the airport expressway of the Xianbei Railway Station as part of the Xian Xianyang International Airport Intercity Railway Project was taken as the research object and explored deformation rules of the expressway cutting slope, pavement, and tunnel structure was studied. The superimposed Peck formula was used to calculate the subsidence law of the ground caused by the underpass of a double line shield tunnel. In the Code for Design of Metro (GB 50157—2013) (shorter for code), a concept was termed diameter deformational rate in the radial direction of the subway tunnel lining structure. This concept was used to calculate the horizontal and vertical diameter deformational rates of the tunnel. Furthermore, the finite difference software FLAC3D was used to simulate the excavation process of the doubletrack shield tunnel and the deformation rules of the expressway cutting slope pavement and tunnel structure were explored, respectively. The results show that the maximum settlement of the pavement appears at the foot of the south slope when the rightline tunnel excavation is directly below the airport expressway, the value is 6.2 mm. The maximum settlement of the slope is 7 mm and it appears immediately above the middle of the doubletrack shield tunnel. After the doubletrack shield tunnel penetrates through, the maximum vertical displacement and the maximum horizontal displacement of the structure are 14.86 and 12.25 mm, respectively. The horizontal and vertical diameter deformational rates of the tunnel lining structure are 0.20 and 0.24%, respectively, which are near each other and meet the code requirements. Depending on the displacement control limit of the airport expressway pavement, the shield construction method meets the deformational requirements of the pavement. The results of this study provide a reference for the construction of a shield section. Meanwhile, it can be a mirror of the same type of approaching construction. 2 tabs, 16 figs, 23 refs.

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更新日期/Last Update: 2019-07-29