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首页> 外文会议>Control of cracking of mass contrete and related issues concerning early age cracking of concrete structures >INVESTIGATION OF STRESSES GENERATED IN SECOND LINING CONCRETE OF NATM TUNNELS IN EARLY AGE
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INVESTIGATION OF STRESSES GENERATED IN SECOND LINING CONCRETE OF NATM TUNNELS IN EARLY AGE

机译：早期NATM隧道第二衬砌混凝土中产生的应力研究

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This study aims to establish a proper finite element modeling method to understand the stress behaviors ofrnsecond lining concrete of a NATM tunnel at the crown and areas close to invert of the tunnel. A commercialrnFEM package named “ASTEA MACS” was utilized for the analysis incorporating nonlinear concrete materialrnbehaviour. The simulation results were compared with actual site measurements, where it was observed thatrnappropriate modeling of the construction and structural joint conditions played a vital role in accurate simulationrnof the structural behaviour of the second lining concrete. It was also proved that appropriate modellings ofrnthermal boundary conditions for heat transfer between the second lining and the environment, and of the thermalrnproperty of water proofing sheet between the second lining and the first lining were also indispensable forrnaccurate simulation of early age temperature distribution of the second lining. Considering the stressrndistributions at two locations of the second lining in the thickness direction, it was observed that the crownrncracks might be non-penetrating cracks and the cracks close to invert might be penetrating cracks.
机译：这项研究旨在建立一种适当的有限元建模方法，以了解在顶部和靠近隧道反面区域的NATM隧道第二衬砌混凝土的应力行为。使用名为“ ASTEA MACS”的商业有限元分析软件包进行了包含非线性混凝土材料行为的分析。将模拟结果与实际现场测量结果进行了比较，结果发现，对结构和结构节理条件进行适当的建模对于准确模拟第二层衬砌混凝土的结构性能起着至关重要的作用。还证明了合适的第二热衬与环境之间的传热边界条件模型以及第二热衬与第一热衬之间的防水片的热性能模型对于第二热衬的早期温度分布的准确模拟也是必不可少的。衬垫。考虑到第二衬里在厚度方向上的两个位置处的应力分布，可以观察到冠裂纹可能是非穿透性裂纹，而接近倒置的裂纹可能是穿透性裂纹。

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