Research progress on non-Darcy seepage characteristics of soil and rock masses
Soil and rock mass are common natural and engineering materials.Clarifying the non-Darcy seepage characteristics of soil and rock mass under different environments is the basis for evaluating the anti-seepage performance and permeability stability of engineering projects.Both soil and rock mass have pore and crack structures;the seepage flow pattern can be classified as low-speed non-Darcy seepage,Darcy seepage and high-speed non-Darcy seepage.Linear models such as Darcy's law will underestimate the flow velocity of low-speed non-Darcy seepage,but will overestimate that of high-speed non-Darcy seep-age.Currently,research methods for analyzing non-Darcy seepage in soil and rock mass include experimen-tal methods,numerical simulation methods,and mathematical analytical methods.These mainly analyze the non-Darcy flow state and its influencing factors to construct a non-Darcy flow model.Factors such as void geometry structure,shear effect,and hydraulic pressure significantly affect the non-Darcy seepage charac-teristics of soil and rock mass.The winding void structure inside soil or rock leads to increased energy loss during infiltration;shear effect causes complex changes in the void structure;hydraulic pressure directly increases water inertia force,affecting the flow state during infiltration.The above research methods along with factor analysis are currently key areas that scholars focus on when studying the non-Darcy seepage characteristics of soil or rock masses.Due to limitations of experimental conditions,theoretical basis and computer performance,the migration process of particle groups in the seepage failure stage,the multi-field coupling seepage analysis of rock and soil mass,the global visual seepage test,and the large-scale multi-media seepage field calculation will be the key aspects of non-Darcy seepage analysis of rock and soil mass in the future.
soil and rock massnon-Darcy seepageinfluencing factornon-Darcy seepage model
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