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基于ANSYS的APDL的二次开发,采用子模型技术处理隧洞开挖后形成的自由面。并以九里湾隧洞为例,分析了隧洞开挖后,隧洞周围孔隙水压力、渗流场流动矢量等分布特征。结果表明,在洞室开挖后形成的自由面所有节点中,洞室的四个角点处的水力梯度较大,其中边墙与顶拱的交叉处节点及边墙在底板稍往上节点处的水力梯度最大,顶拱自由面节点的平均水力梯度最小,为隧洞开挖的排水设计提供了理论依据。
Based on the secondary development of ANSYS-based APDL, the sub-model technology is used to deal with the free surface formed after tunnel excavation. Taking the Jiuliwan tunnel as an example, the distribution characteristics of pore water pressure and seepage field flow vector after tunnel excavation are analyzed. The results show that among all the nodes of the free surface formed in the excavation of the cavern, the hydraulic gradient at the four corners of the cavern is large. Among them, the nodes and sidewalls at the intersection of the side wall and the top arch are slightly larger Where the hydraulic gradient is the largest, and the average hydraulic gradient of the free-knuckle node of roof arch is the smallest, which provides a theoretical basis for drainage design of tunnel excavation.