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中南大学学报(自然科学版)

Journal of Central South University

第51卷    第5期    总第309期    2020年5月

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文章编号:1672-7207(2020)05-1371-13
盾构穿越上软下硬复合地层时的管片力学特性
黄戡1,孙逸玮1,赵磊2,戴亦军3,王栋1,周经伟1,邱朗1

(1. 长沙理工大学 土木工程学院,湖南 长沙,410114;
2. 中南大学 土木工程学院,湖南 长沙,410075;
3. 中建隧道建设有限公司,重庆,401320
)

摘 要: 鉴于当前采用盾构法修建地下铁道时常常需穿越复合地层,而针对复合地层中衬砌圆环的荷载计算尚未建立统一可靠的荷载体系的情况,通过分析传统梁-弹簧法荷载体系在复合地层中存在的缺陷,提出一种适用于该类地层的修正梁-弹簧法荷载体系。以长沙地铁5号线木莲冲路站—雨花广场站和劳动东路 站—华雅站区间复合地层断面为工程背景,采用有限元软件对比分析传统梁弹簧法和修正梁弹簧法荷载体系下管片变形及力学特性。结合现场实测结果,验证修正梁弹簧法的可靠性。研究结果表明:在上软下硬地层中,隧底的竖向位移较小。与传统梁弹簧荷载体系相比,修正梁荷载体系所得隧底管片弯矩方向与传统法所得隧底管片弯矩方向普遍呈现出内侧受拉的情况,而外侧受压的情况则相反,且数值上相应减小。针对上软下硬复合地层要着重验算隧底管片外侧钢筋强度和螺栓抗剪强度,必要时适当调整隧底管片的配筋设计,为此类地层中修建盾构隧道提供参考。

 

关键字: 盾构隧道;复合地层;梁-弹簧法;荷载体系;管片力学分析

Mechanical properties of segments when shield passes through upper-soft and lower-hard composite strata
HUANG Kan1, SUN Yiwei1, ZHAO Lei2, DAI Yijun3, WANG Dong1, ZHOU Jingwei1, QIU Lang1

1. School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China;
2. School of Civil Engineering, Central South University, Changsha 410075, China;
3. China Construction Tunnel Co. Ltd., Chongqing, 401320, China

Abstract:There are a lot of cases that shield method is commonly used to build underground railway through composite strata, but not a unified and reliable load system was established in the load calculation of lining segments in composite strata. In view of this, a modified beam-spring load system suitable for this kind of strata was proposed by analyzing the defects of traditional beam-spring load system in composite strata. Based on the engineering background of the composite stratigraphic sections between Mulianchong Road Station to Yuhua Square Station as well as East Laodong Road Station to Huaya Station of Changsha Metro line 5, finite element software was used to analyze the deformation and mechanical properties of the tube segments in the traditional beam-spring load system and the modified beam-spring load systems. The reliability of the modified beam-spring load system was verified by combining with field measured data.The results show that in the upper soft and lower hard strata,the vertical displacement at the bottom of the tunnel is small. Compared with the traditional beam-spring load system, the bending moment direction of the segment at the bottem of the tunnel obtained by the modified beam-spring load system is generally opposite to that of the traditional one, which manifests as internal tension and exeernal compression, and the numerical value of the internal force is correspondinly reduced. Therefore, it is suggested that the lateral reinforcement strength and bolt shear strength should be checked for this kind of strata, and the reinforcement design of tunnel bottom piece should be adjusted when necessary, which provides reference for the construction of shield tunnel in such strata.

 

Key words: shield tunnel; composite strata; beam-spring method; load system; segment mechanics analysis

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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