轴力和弯矩共同作用下盾构隧道纵向非线性等效抗弯刚度研究
发布时间：2019-03-10 21:32
【摘要】：实际工程中,盾构隧道纵向弯矩和轴力可能同时存在,若按传统的纯弯等效抗弯刚度计算可能会带来较大误差。考虑轴力和弯矩共同作用对纵向弯曲变形的影响,提出5种弯曲模式,在经典的志波模型的基础上,建立盾构隧道纵向等效抗弯刚度计算模型,基于该模型开发了计算程序,以成都地铁3号线盾构隧道为实例,对其纵向等效抗弯刚度和管环张开量随轴力和弯矩的发展规律进行分析,并讨论弯曲模式的实用判别方法,求出变形过程的临界弯矩,最后给出纵向弯曲变形为线性和非线性的内力条件。研究发现:盾构隧道纵向变形随弯矩的发展过程可按轴力分为4类,各过程下管环张开量和等效抗弯刚度随弯矩的发展规律十分不同;轴力对等效抗弯刚度有显著影响,一般呈现压弯纯弯拉弯的规律。研究成果可应用于盾构隧道结构纵向力学分析、抗弯刚度分析等方面。
[Abstract]:In practical engineering, the longitudinal bending moment and axial force of shield tunnel may exist at the same time. If the traditional calculation of equivalent bending stiffness of shield tunnel is taken into account, there may be a large error in calculating the equivalent bending stiffness of shield tunnel. Considering the influence of axial force and bending moment on longitudinal bending deformation, five bending modes are put forward. Based on the classical log wave model, the calculation model of longitudinal equivalent bending stiffness of shield tunnel is established, and the calculation program is developed based on this model. Taking the shield tunnel of Chengdu Metro Line 3 as an example, the development law of longitudinal equivalent bending stiffness and pipe ring opening with axial force and bending moment is analyzed, and the practical discrimination method of bending mode is discussed, and the critical moment of deformation process is obtained. Finally, the internal force conditions under which the longitudinal bending deformation is linear and nonlinear are given. It is found that the longitudinal deformation of shield tunnel can be divided into four types according to the axial force with the development of bending moment. The opening amount of the pipe ring and the equivalent bending stiffness under each process are very different with the development rule of the bending moment. Axial force has a significant effect on the equivalent bending stiffness, and generally presents the law of pure bending and tension bending. The research results can be applied to longitudinal mechanics analysis and bending stiffness analysis of shield tunnel structure.
【作者单位】： 西南交通大学交通隧道工程教育部重点实验室;
【基金】：国家自然科学基金资助项目(51378433,51578457) 国家重点研发计划(2016YFC082202)~~
【分类号】：U455.43
本文编号：2438048
[Abstract]:In practical engineering, the longitudinal bending moment and axial force of shield tunnel may exist at the same time. If the traditional calculation of equivalent bending stiffness of shield tunnel is taken into account, there may be a large error in calculating the equivalent bending stiffness of shield tunnel. Considering the influence of axial force and bending moment on longitudinal bending deformation, five bending modes are put forward. Based on the classical log wave model, the calculation model of longitudinal equivalent bending stiffness of shield tunnel is established, and the calculation program is developed based on this model. Taking the shield tunnel of Chengdu Metro Line 3 as an example, the development law of longitudinal equivalent bending stiffness and pipe ring opening with axial force and bending moment is analyzed, and the practical discrimination method of bending mode is discussed, and the critical moment of deformation process is obtained. Finally, the internal force conditions under which the longitudinal bending deformation is linear and nonlinear are given. It is found that the longitudinal deformation of shield tunnel can be divided into four types according to the axial force with the development of bending moment. The opening amount of the pipe ring and the equivalent bending stiffness under each process are very different with the development rule of the bending moment. Axial force has a significant effect on the equivalent bending stiffness, and generally presents the law of pure bending and tension bending. The research results can be applied to longitudinal mechanics analysis and bending stiffness analysis of shield tunnel structure.
【作者单位】： 西南交通大学交通隧道工程教育部重点实验室;
【基金】：国家自然科学基金资助项目(51378433,51578457) 国家重点研发计划(2016YFC082202)~~
【分类号】：U455.43
【相似文献】
相关期刊论文 前4条
1 代汉超;石雪飞;阮欣;;基于改进响应面的桥梁抗弯刚度修正[J];中南大学学报(自然科学版);2014年07期
2 张显明;胡建新;;截面有效抗弯刚度的影响因素分析[J];华东交通大学学报;2010年05期
3 刘凯;万会宝;楚留声;;T型梁抗弯刚度及工程造价分析[J];河南科学;2013年07期
4 袁红茵;肖晓辉;张建民;;基于高精度模态环境振动测试及导入最佳平差参数的桥梁在线抗弯刚度识别方法[J];科学技术与工程;2006年19期
相关硕士学位论文 前1条
1 谢晓峰;索的抗弯刚度识别方法研究[D];中南大学;2012年
，本文编号：2438048
本文链接：https://www.wllwen.com/kejilunwen/daoluqiaoliang/2438048.html
