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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 up around the shallow underground structure. The FLAC3D was used as the free field, and the non-free field of common subsurface structure was compared with the non-free field liquefaction of gravel drainage layer. The liquefaction distribution characteristics of gravel drainage layer method were studied. To verify the anti-liquefaction effect of the gravel drainage layer method and analyze the dynamic characteristics of the non-free liquefaction field structure of the gravel drainage layer. The calculation results show that the gravel drainage layer is arranged around the underground structure in the liquefaction field, the liquefaction will not occur around the structure, and the excess hydrostatic pressure in the liquefaction field in the distant structure will be significantly reduced. The structure will not float and the horizontal drift will decrease. Gravel drainage layer increases the overall quality and stiffness of the structure and gravel, increasing the stability of the structure. The research results provide theoretical and experimental basis for the design of underground structure crossing liquefied soil.