不同固化方式对微生物固化花岗岩残积土抗冲刷性能试验研究

Experimental Study on the Scour Resistance of Microbially Cured Granite Residual Soils by Different Curing Methods

采用表面处理方式对花岗岩残积土进行抗冲刷模型试验,结合扫描电镜观测微观测试技术,研究了喷洒式和拌合式微生物诱导碳酸钙沉淀(Microbially Induced Calcium Carbonate Precipitation,MICP)表面处理对花岗岩残积土的抗冲刷性的改善效果并探讨其微细观控制机制。结果表明:经MICP表面处理后,碳酸钙可胶结表层花岗岩残积土颗粒,在表面形成团聚体,碳酸钙沉淀和团聚体连续胶结的形成硬壳层,可有效提高坡面土体的抗冲刷性能。研究结果可为花岗岩残积土边坡加固提供可靠的依据。

Surface treatments were used to model the scour resistance of granite residual soils,combined with scanning electron microscopy to observe microscopic testing techniques,to investigate the effect of sprayed and mixed microbial-induced calcium carbonate precipitation surface treatments on the improvement of the scour resistance of granite residual soils and to explore the microscopic control mechanisms.The results show that after the MICP surface treatment,calcium carbonate can cement the surface granite residual soil particles and form agglomerates on the surface,and the formation of a hard shell layer with continuous cementation of calcium carbonate precipitation and agglomerates can effectively improve the scour resistance of the slope soil.The results of the study can provide a reliable basis for the reinforcement of granite residual soil slopes.