【摘要】 考虑盾构隧道施工中产生的地应力释放,采用有限元法模拟了不同地质条件下的盾构隧道管片的内力分布。将有限元模拟的盾构隧道施工引起的地表沉降值与现场观测值的对比,确定了某地铁隧道施工引起的地应力释放率。有限元模拟分析结果表明,地表的最大沉降近似与地应力释放率成正比,并建立了两者之间的映射关系。研究表明,与不考虑地应力释放率相对比,实际的管片最大弯矩、最大轴力和最大剪力分别下降了48%,62%和49%。考虑盾构施工引起地应力释放所得到的管片内力会更加接近实际的情况。更多还原

【Abstract】 In consideration of release of the ground stress in shield tunnel construction,the internal force distribution of shield tunnel segments under different geological condition was simulated by using finite element method. By comparing the ground settlement value caused by shield tunnel construction of finite element simulation with the site observation value,the release rate of the ground stress caused by a subway tunnel construction was determined. The finite element simulation analysis result indicates that, the actual maximum settlement is approximately proportional to ground stress release rate,and the mapping relationships between them are established.The study shows that,by comparing without considering ground stress release rate,the maximum bending moment,axial force and shear force of tunnel segments decrease by about 48%,62% and 49% respectively.The internal force of segments is more close to actual condition with consideration of the ground stress caused by shield tunnel construction.更多还原