Microscopic characteristics and strength variation mechanism of indigenous microbial solidified fine-grained sulfate saline soil
Due to high energy consumption and significant environmental negative effects of physical and chemical methods for improving the engineering properties of saline soil,solidification experi-ments on the fine-grained sulfate saline soil are conducted by using indigenous urealytic microor-ganisms developed in saline environments in high-altitude cold regions.The strength characteristics of microbial solidified saline soil are studied by making use of microscopic tests and triaxial compres-sion tests.The results indicate that the shear strength of fine-grained sulfate saline soil can be in-creased up to 2.9 times after being solidified by microorganisms.The enhancement mechanism is de-termined by the degree of improvement in adhesive strength.The initial tangent modulus and stiffness of the solidified soil are improved,and the anti deformation ability is enhanced.The research results have guiding significance for theoretical research and practice on the improvement of stability and bearing capacity of solidified soil.
NETL
NSTL
万方数据
