跨多断层水工隧洞精细化动力响应分析

Highly detailed dynamic response analysis for hydraulic tunnels across multiple faults

摘要

我国西南强震区建设有大量水工隧洞，多断层复杂地质条件对隧洞动力响应有不可忽视的影响。然而，现有研究主要针对单断层简化地质模型，忽略了真实三维空间地层条件及多断层分布对隧洞的影响。针对这一问题，本研究提出了复杂地质条件下跨多断层网络的水工隧洞精细化建模方法。首先基于工程实测数据和三维地质建模技术构建三维精细化实体模型，随后通过非结构化和结构化组合的方式进行复杂网格剖分，最后以实际工程为例建立了跨多断层网络水工隧洞精细化模型并开展动力响应分析，研究了断层数目和内水作用对动力响应的影响。结果表明：断层条数对隧洞动力响应有显著影响，响应值均随断层条数的增加而增加；在地震作用下内水会在断层处形成孔隙水压力集中区，内水作用会显著加剧地震响应，隧洞断面围岩稳定性指标最大增加幅度为19.6%，增加程度不可忽视；隧洞的弯曲部位是地震易损部位，需要进行防护。所提出的方法和分析结果可为多断层复杂地质条件下水工隧洞抗震分析提供参考。

Abstract

There are a large number of hydraulic tunnels built in the strong earthquake area in southwest China, and the complex geological conditions with multiple faults have a significant influence on the dynamic response of the tunnels. However, the existing researches mainly focus on the simplified geological model of single fault, neglecting the real three-dimensional spatial formation conditions and the influence of multi-fault distribution on the tunnel. To solve this problem, a fine modeling method of hydraulic tunnel across multi-fault network under complex geological conditions is proposed in this paper. First, a 3D refined solid model is constructed based on the measured engineering data and 3D geological modeling technology, and then the complex mesh is divided by unstructured and structured combination. Finally, a refined model of hydraulic tunnel across multi-fault network is established to carry out dynamic response analysis by taking the actual project as an example, and the influence of the number of faults and internal water action on dynamic response is studied. The results show that the number of faults has a significant effect on the dynamic response of the tunnel, and the response value increases with the increase of the number of faults. Under earthquake action, the internal water will form pore water pressure concentration area at the fault, and the internal water action will significantly aggravate the seismic response. The maximum increase of the stability index of the surrounding rock of the tunnel section is 19.6%, which cannot be overlooked. The bending part of the tunnel is vulnerable to earthquake and needs to be protected. The proposed method and analysis results can provide reference for seismic analysis of hydraulic tunnel under complex geological conditions with multiple faults.

关键词

多断层网络 / 精细化模型 / 水工隧洞 / 内水作用 / 动力响应

Key words

multi-fault network / highly detailed model / hydraulic tunnel / inner water action / dynamic response

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基金资助

国家自然科学基金资助项目(52309166)

国家自然科学基金资助项目(52179139)

天津市青年科技人才项目(QN20230328)