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郑庆坂,潘 伍,覃永杰,等. 大断面矩形盾构隧道等效抗弯刚度研究[J]. 科学技术与工程, 2020, 20(23): 9590-9596.
ZHENG Qing-ban,PAN Wu,QIN Yong-jie,et al.Study on equivalent bending stiffness oflarge section rectangular shield tunnel[J].Science Technology and Engineering,2020,20(23):9590-9596.
大断面矩形盾构隧道等效抗弯刚度研究
Study on equivalent bending stiffness oflarge section rectangular shield tunnel
投稿时间:2020-01-03  修订日期:2020-05-10
DOI:
中文关键词:  矩形盾构隧道  纵向等效连续化模型  中性轴位置  等效纵向抗弯刚度有效率
英文关键词:rectangular shield tunnel  longitudinal equivalent continuum model  neutral axis position  effective rate of equivalent longitudinal flexural stiffness
基金项目:
           
作者单位
郑庆坂 中铁隧道局集团建设有限公司
潘 伍 中铁隧道局集团建设有限公司
覃永杰 中铁隧道局集团建设有限公司
张 凡 中山大学 智能工程学院
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中文摘要:
      矩形盾构隧道纵向等效抗弯刚度是衡量隧道受力变形的重要参数,对于指导施工及隧道纵向结构设计具有重大意义。本文将横向刚度与纵向等效抗弯刚度联立起来,由力学平衡条件确定中性轴位置,根据弯矩平衡条件及等效连续梁转角公式推导得到大断面矩形盾构隧道纵向等效抗弯刚度解析解,并探讨了管片宽厚比、长短边螺栓分布、管片厚度等对等效抗弯刚度的影响。研究结果表明,截面长宽比由1增长100%时,隧道纵向抗弯刚度有效率η由2.7875降低为原来的15.3%,最终值为0.4262;中性轴距离c值减小了49.6%,最终值为2.2730 m。截面厚度t由0.25增长到0.55时,中性轴距离c由2.1885 m降低0.62%,等效抗弯刚度有效率η由0.099 m增加7.8%。长短边厚度比由1增长到2时,中性轴位置c值由2.1749 m增长0.34%,纵向等效抗弯刚度有效率η由0.1067降低了21.27%。截面螺栓个数从30增加到80时,c值由2.1504增长1.43%,等效纵向抗弯刚度有效率η由0.1216降低了12.25%。考虑螺栓分别沿隧道截面长短边均匀分布时,等效纵向抗弯刚度及抗弯刚度有效率大约为理想情况下螺栓均匀化分布时的2/3。在截面螺栓总数不变的前提下,适当降低截面短边螺栓所占比例可有效提升截面抗弯性能。
英文摘要:
      The longitudinal equivalent bending stiffness of rectangular shield tunnel is an important parameter to measure the stress and deformation of tunnel, which is of great significance to guide construction and design of tunnel longitudinal structure. In this paper, the lateral stiffness and longitudinal equivalent flexural rigidity simultaneous, by the mechanical equilibrium conditions to determine the position of neutral axis, according to the bending moment equilibrium conditions and big section was derived formula of equivalent continuous beam Angle rectangular shield tunnel longitudinal equivalent bending stiffness analytical solution, and discusses the segment generous ratio and length of bolt, segment thickness on the influence of the equivalent flexural rigidity. Assumed that cross section aspect ratio increase by 100% from 1, tunnel longitudinal bending stiffness efficient η reduced from 2.7875 to 15.3%, the final value is 0.4262; The neutral wheelbase c value decreased by 49.6% from 4.5055m, and the final value was 2.2730 m. Cross section thickness increases from 0.25 to 0.55, neutral wheelbase from c by 2.1885 m by 0.62%, the equivalent flexural rigidity efficient η 7.8% increase by 0.099 m. The thickness ratio of long and short side varies from 1 to 2, the position of neutral axis c value increase by 0.34% from 2.1749 m, longitudinal equivalent flexural rigidity efficient η decreased by 21.27% from 0.1067. Section bolt number increased from 30 to 80, the value of c increased by 1.43% from 2.1504, the equivalent longitudinal bending stiffness efficient η by 0.1216 was reduced by 12.25%. When considering the uniform distribution of bolts along the length and length of the tunnel section, the equivalent longitudinal bending stiffness and the effective rate of bending stiffness are about 2/3 of the ideal distribution of bolts. On the premise that the total number of bolts in the section is unchanged, proper reduction of the proportion of short side bolts can effectively improve the section bending performance.
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