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Investigation on the tail brush induced loads upon segmental lining of a shield tunnel with small overburden

机译：小覆盖层盾构隧道分段衬砌尾刷引起的荷载研究

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摘要

Damage to the tunnel segmental lining induced by the construction loads has become an important issue in recent years. To investigate the influence of tail brush induced loads on linings during construction, in-situ monitoring was carried out to measure the pressure on the lining of a large cross-river shield tunnel with a small overburden in silty sandy ground in China. Time history of pressure distribution on the lining during tunnel construction was obtained using PAD type earth pressure gauges. Distribution of bending moments and axial forces and related crack width of segments were also examined. The in-situ monitoring results showed that the pressure induced by tail brush (steel plate brush and wire brush) had an important influence on the segments while the shield machine was passing through. Moreover, results from laboratory tests carried out on steel plate brush and wire brush to investigate the extent of loading, revealed that the load by the steel plate brush was more significant than that by the wire brush. Based on the data analysis and field observation, it can be concluded that the non-uniform distribution of pressure induced by steel plate brush might have caused cracking and water leakages in the segments, which can provide valuable references for damage prevention from construction loads in practice.
机译：近年来，由施工荷载引起的对隧道分段衬砌的破坏已成为重要的问题。为了研究施工过程中尾刷引起的载荷对衬砌的影响，在中国粉质砂土中进行了现场监测，以测量覆盖较小的大跨河盾构隧道衬砌的压力。使用PAD型土压计获得隧道施工期间衬砌上压力分布的时间历程。还检查了弯矩和轴向力的分布以及分段的相关裂缝宽度。现场监测结果表明，在盾构机通过时，尾刷（钢板刷和钢丝刷）产生的压力对节段有重要影响。此外，通过对钢板刷和钢丝刷进行实验室测试以研究负载程度的结果表明，钢板刷的负载比钢丝刷的负载更大。通过数据分析和现场观察，可以得出结论，钢板刷引起的压力不均匀分布可能会导致各段开裂和漏水，为实际施工中的施工破坏提供参考。 。

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