Experimental Study On Permeability Properties Of Lacustrine Peaty Soil

Peat(including peat soil)is a kind of special soil composed of organic matter aggregates,inorganic mineral and plant root,the physical and mechanical properties of the soft soil and general soil and organic matter are quite different.In this paper,the peat soils in Kunming and Dali area as the object,permeability characteristics of the Yunnan Lacustrine peat soil,and combined with the characteristics of pore distribution of peat soil consolidation in the mechanism analysis of the permeability characteristics.Specific research contents include:(1).the consolidation and seepage test of Lacustrine peat soil under one side limit condition was carried out to study its compression and permeability characteristics.Through long-term and graded loading test,study the relationship between T and consolidation stress loading and permeability coefficient of kv,e-kv and the peat normalized model was explored.(2)through three triaxial consolidation and permeability tests,isotropic consolidation conditions of peat soil infiltration characteristics were studied to explore the vertical permeability coefficient kv and confining pressure and void ratio sigma relationship between e and comparative analysis of the similarities and differences between the variation of permeability coefficient of peat soil three axis isotropic consolidation and one-dimensional unconfined consolidation under the condition of.(3).the porosity characteristics of fibrous peat soil and high decomposed peat soil were analyzed by scanning electron microscopy,and the infiltration mechanism of Plateau Lake peat soil was qualitatively analyzed from the microscopic point of view.The pore distribution characteristics of Lacustrine peat soil in one-dimensional consolidation process were studied by mercury intrusion test,and the distribution pattern of pore in peat soil under one-dimensional consolidation and grading loading was analyzed.The microstructure model of peat soil was established,and the microcosmic mechanism of the change of soil permeability was quantitatively analyzed from the change of pore distribution of peat soil during the compression process.