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Structural characteristics and variable mass permeability of fall column broken rock mass

Suo Jie, Qin Qirong, Li Zhenhua

Archives of Civil Engineering

2024

Vol. 70, nr 1

459--472

In order to analyze the relationship between the configuration characteristics, variable mass permeability characteristics and the catastrophe mechanism of falling column process, The influence of the permeability was studied by diffraction instrument, And using the seepage test system of the fall column, The seepage instability process of variable mass broken rock mass is analyzed, The findings suggest that, The proportion of coarse particles accounted for 89.86%, Fine particles accounted for 10.14%, Broken rock particles is better, Low compression performance; The fall column, under strong hydrodynamic conditions, Due to its strong characteristics of migration and loss with water flow, It is easy to induce the subsidence column protrusion water disaster; As the ratio between coarse and fine aggregates increases, Porosity and permeability are both increased; When the axial displacement does not change, With the increasing circumference pressure, The permeability of the broken rock samples is decreasing; The fitting of the seepage velocity of the broken rock mass to the pore pressure gradient follows the Forchheimer relationship, The seepage of the broken rock mass belongs to the category of non-Darcy flow under the triaxial stress; The instability of the subsidence column fracture rock mass presents three seepage instability forms: initial seepage stage, seepage mutation stage and piping stage in different stages.

Theoretical analysis and verification of the influence of bubble, pore throat and water film on pore water seepage characteristics‑taking sandstone as the research object

Fan Shengyuan, Song Zhanping, Li Xu, Tian Xiaoxu, Liu Lianbaichao, Li Kanglin

Archives of Civil and Mechanical Engineering

2023

Vol. 23, no. 4

art. e225, 1--21

Bubble, pore throat and water film will significantly affect the seepage characteristics of pore water. Based on the theory of porous media and mass and momentum conservation of pore water, this research investigates the blocking effects of bubble, pore throat and water film on the seepage water. According to the bubble force balance relationship, there exists a threshold ΔP at the pore throat. It is discovered through theoretical analysis that the small bubble cannot obstruct the pore throat, while the large bubble could pass through the pore throat after deforming and rupturing as the water pressure is greater than ΔP. In contrast, the bubble cannot pass through the pore throat and will block the water seepage. Meanwhile, the energy will be consumed in the aforementioned process, which will cause a drop in the pressure and seepage velocity of pore water along the seepage path, resulting in the non-uniform seepage characteristics of pore water. Combined with theoretical analysis, considering the factors of water injection pressure and pore size, the seepage and distribution characteristics of pore water are evaluated from macro- and micro-levels through sandstone water injection tests and numerical simulation analysis. Two experimental findings are very consistent, both reflect the non-uniform seepage characteristics of pore water and validate the rationality and precision of the theoretical analysis about the throat threshold ΔP. The findings of this study have certain theoretical reference significance for the theoretical research and practical engineering application about pore water seepage.