The filled broken rock mass in a geothermal reservoir under high-pressure work fluid and overburden stress is of great significance to the efficient operation of the geothermal system. The pore structure and hydraulic properties of the broken rock mass were quantitatively investigated by the nuclear magnetic resonance (NMR) technology and the non-Darcy models. The broken rock mass at the lower compressive stress levels shows stronger compressibility, and the broken gangue with more small particles shows stronger stress sensitivity. The seepage pores in broken rock can be characterized by the fractal theory, and the fractal dimension ranges from 2.749 to 2.861, which is positively correlated with compressive stress. The increase in $Dp$ can be attributed to the shrinkage of macropores affected by the increasing compressive stress. The flow in broken rock mass under high pressure gradient shows significant nonlinearity verified by the Forchheimer equation and the Barree-Conway equation. We proposed a logistic regression model to characterize the effects of compressive stress and GSD on the permeability and the characteristic parameter of nonlinear flow in broken rock mass, which provides a potential method for evaluating the performance of the geothermal system based on the pore structure of the reservoir rock mass.

Article Percolation Model of Brittle-Ductile Transition in PP/EPDM Blends was published on July 1, 1993 in the journal Journal of Polymer Engineering (volume 12, issue 3).

In mining operations, the rock mass located between the water-conducting fault fracture zone and the waterproof protective coal column is highly susceptible to damage, which may result in sudden water inrush disasters. This paper first employs indoor experiments and on-site rock sample analysis to determine the macroscopic mechanical parameters of rocks and rock masses, as well as the microscopic mechanical parameters of block contacts. The fracture and seepage evolution mechanisms in the mining-induced rock mass adjacent to major faults were analyzed utilizing the discrete element-fluid coupling theory in Universal Distinct Element Code (UDEC). The results identified three primary pathways for water hazards caused by mining: the calculated stress field and seepage field indicated that the formation of the water-inrush channels was determined by the parameters of coal seam mining. Different waterproof protective coal columns were set up for the three geological conditions under study. Additionally, a “claw-shaped” detection and flow monitoring method has been proposed for small water-conducting faults. These findings are important and provide valuable guidance for understanding and managing water inrush hazards in mining operations near major faults.