灰色关联法在地铁隧道结构应力预测中的应用

Application of grey correlation analysis in structural stress prediction of metro tunnel

西安地处国内地裂缝发育最强烈的汾渭盆地,已经出露地表和隐伏的地裂缝达14条。地裂缝已成为西安市地铁施工及运营中的一种典型地质灾害,地裂缝的活动性会造成地铁隧道结构扭曲及衬砌面开裂渗漏水,直接影响地铁的施工及安全运营。灰色关联分析法作为灰色系统控制理论中的一种方法在工程技术系统应用较少,利用灰色关联分析法的基本原理结合地裂缝活动作用下隧道结构的界面力学特征建立了地铁隧道结构应力的预测模型,对地铁隧道结构与地裂缝相交时的应力值进行了预测。预测结果可为地铁隧道的安全监测提供预警判据。

Xian is located in Fen - wei Basin where intense ground fissures are developed and there are 14 exposed or con-cealed ground fissures that have become typical geological disasters threatening to the metro construction and operation. The activ-ity of ground fissure causes distortion of the metro tunnel structure and crack and seepage of the lining surface, which directly af-fect the construction and safe operation of the subway. Grey correlation analysis method, as a new approach of control theory of grey system, is seldom used in engineering field. Based on the fundamental principle of the grey correlation analysis method and interface mechanics of tunnel structure under the effect of ground fissure activity, the predicting model for structural stress of the metro tunnel is established to predict the stress values at the intersection between the metro tunnel and the ground fissures, which can provide evidence for safety supervision alarming of metro tunnel.