盾构隧道等效弯曲刚度的简化计算

发布时间：2018-04-17 02:22

本文选题：刚度有效率 + 变刚度　；参考：《上海大学学报(自然科学版)》2015年01期

【摘要】：在传统刚度有效率研究的基础上,采用弹性力学的变刚度梁计算方法进行了隧道位移和变形的计算,由此得到了简化的纵向刚度有效率计算表达式.实例分析表明:随着螺栓个数的增加和半径的增大,隧道纵向刚度有效率和纵向等效刚度均增大;但是随着螺栓个数的增加,纵向刚度有效率表现为同方向、近线性关系;同时随着螺栓半径的增大,纵向刚度有效率表现为同方向、近抛物线关系;而随着管片厚度和管片混凝土模量的增大,纵向刚度有效率降低.在此基础上考虑由管片刚度改变引起的应力集中,研究了埋深对刚度有效率的影响,结果表明,随着埋深的增加刚度有效率呈线性降低,即隧道纵向等效抗弯刚度减小.研究结果对盾构隧道设计具有一定的指导意义.
[Abstract]:On the basis of the traditional research on the efficiency of stiffness, the displacement and deformation of the tunnel are calculated by the method of variable stiffness beam of elastic mechanics, and the simplified expression of the efficiency of longitudinal stiffness is obtained.The analysis of examples shows that with the increase of bolt number and radius, the longitudinal stiffness efficiency and the longitudinal equivalent stiffness increase, but with the increase of bolt number, the longitudinal stiffness efficiency shows the same direction, near linear relationship.At the same time, with the increase of bolt radius, the efficiency of longitudinal stiffness is the same direction, near parabola, but with the increase of segment thickness and concrete modulus, the efficiency of longitudinal stiffness decreases.On this basis, the stress concentration caused by the change of segment stiffness is considered, and the effect of buried depth on stiffness efficiency is studied. The results show that the efficiency of stiffness decreases linearly with the increase of buried depth, that is, the longitudinal equivalent bending stiffness of tunnel decreases.The research results have certain guiding significance for shield tunnel design.
【作者单位】：上海大学土木工程系;
【基金】：国家自然科学基金资助项目(41172238)
【分类号】：U455.43

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