基于云模型的盾构隧道开挖面稳定性评价

Stability evaluation of excavation face of shield tunnel based on cloud model

随着国内盾构开挖技术的不断成熟,各大型盾构隧道相继建成,与此同时盾构施工中所遇到的各类安全性问题也日益凸显.因此,基于过江隧道盾构掘进时由于开挖面的不稳定造成的安全隐患问题,针对衡阳湘江隧道盾构开挖施工区段岩溶-侵蚀耦合作用下的特殊地形,提出了一种基于云模型理论的盾构隧道安全评价方法;建立了一套盾构隧道开挖面稳定性的评价因素体系,并通过云模型算法得出综合评价数字特征并生成云滴图.结果表明:基于云模型的安全评价方法可以量化开挖面稳定性评价的定性评价标准;采用云模型的评价方法能降低评价标准的主观性,在现有规范的基础上,能为隧道施工过程解决开挖面稳定性提供一定的对策和参考.

With the continuous maturity of domestic shield excavation technology,various large shield tunnels have been built one after another.At the same time,various safety problems encountered in shield construction have become increasingly prominent.therefore,based on the potential safety risk caused by the instability of the excavation face during the shield tunneling of the river-crossing tunnel,a shield tunnel safety evaluation method based on cloud model theory is proposed for the special topography of Hengyang Xiangjiang Tunnel,which is influenced by the karst-erosion coupling in the shield tunneling section.The evaluation index system for the tunnel face stability of shield tunnel is established.The cloud model algorithm is used to obtain the digital features of comprehensive evaluation,generating the cloud drop graph.The results show that the safety evaluation method based on cloud model can quantify the qualitative evaluation criteria for the stability evaluation of excavation face,it can reduce the subjectivity of the evaluation standard.On the basis of existing standard,this method can provide references for improving the tunnel face stability during the tunnel construction.