碎石排水层地下结构非自由场液化数值试验分析

Numerical experiments and analysis for liquefaction in a non-free-field with gravel stone drainage layer around underground structures

在浅埋地下结构周围设置碎石排水层,应用FLAC3D作自由场、普通地下结构非自由场、碎石排水层地下结构非自由场液化对比数值试验,研究碎石排水层法液化场液化分布特性,验证碎石排水层方法的抗液化效果,分析碎石排水层非自由液化场结构的动力特性变化。计算结果表明,液化场中地下结构周围设置碎石排水层,结构周围则不会液化,结构远处液化场中的超静水压力显著降低,结构不出现上浮,水平漂移减小。碎石排水层加大了结构与碎石的整体质量和刚度,增加了结构的稳定性。研究成果为地下结构穿越液化土层设计提供理论及试验基础。

The gravel drainage layer was set around underground structure.The numerical liquefaction experiment was separately completed in the free field,the non-free-field and the gravel drainage layer non-free-field using FLAC3D.The liquefaction distributed characteristic of the gravel drainage layer non-free-field was studied.The anti-liquefaction effect of the gravel drainage layer was investigated,and the dynamic characteristic change of underground structures after imposition of a gravel drainage layer in liquefaction field was analyzed.Calculations indicate that the gravel drainage layer around the underground structure was not liquefied,the excess static pore pressure was obviously reduced in the distant liquefaction field,the structure did not float,and the horizontal drift was reduced.As the overall quality and rigidity of the structure with gravel drainage layer increased,the stability of the structure increased.Further research will provide a theoretical and experimental basis for the design of underground structures through the liquefaction soil layer.