Modelling Biogrout: A New Ground Improvement Method Based on Microbial-Induced Carbonate Precipitation
Modelling Biogrout: A New Ground Improvement Method Based on Microbial-Induced Carbonate Precipitation
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DOI：
10.1007/s11242-010-9691-8
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发表时间：
2011-03
影响因子：
2.7
通讯作者：
W. V. Wijngaarden;F. Vermolen;G. V. Meurs;C. Vuik
中科院分区：
文献类型：
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作者：
W. V. Wijngaarden;F. Vermolen;G. V. Meurs;C. Vuik
生物灌浆是一种基于微生物诱导碳酸盐沉淀的新型土壤加固方法。细菌被放置，反应物被冲洗通过土壤，导致碳酸钙沉淀，引起土壤强度和刚度的增加。由于这种降水，土壤的孔隙度降低。孔隙度的降低影响渗透率，从而影响流动。为了分析Biogrout过程，创建了一个描述该过程的模型。该模型包含存在于生化反应中的溶解物质的浓度。这些浓度可以从具有可变孔隙度的对流-弥散-反应方程求解。其他模型方程涉及细菌、固体碳酸钙浓度、（减小的）孔隙度、流体的流量和密度。流体的密度由于生物化学反应而改变，这导致密度驱动流。偏微分方程求解的标准伽辽金有限元法。模拟完成了一些一维和二维配置。1D配置可用于对柱实验进行建模，2D配置可对应于3D配置的片或横截面。
Biogrout is a new soil reinforcement method based on microbial-induced carbonate precipitation. Bacteria are placed and reactants are flushed through the soil, resulting in calcium carbonate precipitation, causing an increase in strength and stiffness of the soil. Due to this precipitation, the porosity of the soil decreases. The decreasing porosity influences the permeability and therefore the flow. To analyse the Biogrout process, a model was created that describes the process. The model contains the concentrations of the dissolved species that are present in the biochemical reaction. These concentrations can be solved from a advection–dispersion–reaction equation with a variable porosity. Other model equations involve the bacteria, the solid calcium carbonate concentration, the (decreasing) porosity, the flow and the density of the fluid. The density of the fluid changes due to the biochemical reactions, which results in density driven flow. The partial differential equations are solved by the Standard Galerkin finite-element method. Simulations are done for some 1D and 2D configurations. A 1D configuration can be used to model a column experiment and a 2D configuration may correspond to a sheet or a cross section of a 3D configuration.