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松软的砂土地基在地震等作用下会发生液化,可能造成巨大的灾害。地基抗液化问题的相关研究具有极大的理论意义和工程意义。利用新兴的微生物诱导碳酸钙结晶技术(MICP技术)来处理液化砂土;然后通过三轴固结不排水试验(CU)和动三轴试验来考察其力学性质。试验结果表明:微生物诱导碳酸钙的生成改善了砂土的抗液化性能;最后利用TTS本构模型对其进行数值模拟,表明该模型具有在单元尺度上统一描述砂土及MICP处理后的砂土应力-应变的能力。
Soft sand foundations can liquefy under the effects of earthquakes and the like, which can cause huge disasters. The research on the anti-liquefaction of foundation has great theoretical and engineering significance. Liquefaction sand was treated with the emerging microbial-induced calcium carbonate crystallization technique (MICP technique); and its mechanical properties were examined by triaxial consolidated undrained test (CU) and dynamic triaxial tests. The results show that the formation of calcium carbonate by microorganisms can improve the liquefaction resistance of sand, and the numerical simulation using TTS constitutive model shows that the model has a uniform distribution of sand and MICP on the unit scale Stress-strain capability.