盾构隧道已开裂管片的受力变形特性

发布时间：2018-07-08 09:29

本文选题：盾构隧道 + 管片　；参考：《土木建筑与环境工程》2014年03期

【摘要】：结合广州地铁某已运营的盾构区间隧道现状,通过采用三维Goodman单元来模拟管片已存在的裂缝,对盾构区间隧道已开裂管片的裂缝深度变化对管片结构造成的影响进行了分析,同时也对侧向土压力、地基弹簧系数以及地下水位等几种重要因素对管片受力变形特性的影响进行了评估。研究表明,随着裂缝深度的增加,管片砼的拉应力、压应力虽然达到最大值,但变化幅度并不大。但当裂缝接近径向贯通的时候,钢筋的拉应力值会大大增加,有可能超过允许值。同时,在盾构管片存在既有裂缝的情况下,盾构管片的最大拉应力值、水平和竖向收敛值、竖向沉降值均随侧向土压力系数、地基弹簧系数的减少而增大,同时随地下水位埋深的增大而增大。根据研究结果,对该区间隧道盾构隧道的裂缝等病害采取了针对性修复措施,目前无新的裂缝出现,总体处于稳定及安全的状态。
[Abstract]:According to the current situation of an existing shield tunnel in Guangzhou Metro, the influence of crack depth variation of cracked segment on segment structure is analyzed by using 3D Goodman element to simulate the existing cracks in the segment. At the same time, some important factors, such as lateral earth pressure, spring coefficient of foundation and groundwater level, are also evaluated. The results show that with the increase of crack depth, the tensile stress and compressive stress of segment concrete reach the maximum value, but the range of variation is not large. However, when the crack is close to radial penetration, the tensile stress of steel bar will increase greatly, which may exceed the allowable value. At the same time, the maximum tensile stress value, horizontal and vertical convergence value, vertical settlement value of shield segment increase with the decrease of lateral earth pressure coefficient and spring coefficient of foundation. At the same time, it increases with the increase of groundwater level. According to the results of the research, some measures are taken to repair the cracks of shield tunnel in this section. There are no new cracks and they are in a stable and safe state.
【作者单位】：中南大学土木工程学院;广州市市政集团有限公司;
【基金】：广东省国际合作项目(2012B050300005) 广州市建筑集团有限公司科技计划项目(2010KJ007)
【分类号】：U455.43;U457

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