Experiment study on the cross-layer propagation characteristics of hydraulic fracturing cracks in coal roof rocks.

ABSTRACT: Fracture of the overlying roof of a coal seam has become the main method to increase the permeability of coal seam in coalbed methane exploitation. Because the fracture must grow into the coal and through any stone layers, the mechanical property difference between the overlying roof rocks and coal inevitably leads to significant changes in the crack propagation behaviors. In this study, an embedded strain sensor with low cost and simple operation is used to measure the strain in laboratory samples representing the coal seam and roof near the interface for fractures initiated in the roof to obtain the width change of the hydraulic fracture at the interface. At the same time, the propagation behavior of hydraulic fractures at the interface is expressed by combining fracture images and pumpi

SUBMITTER: Yang M 

PROVIDER: S-EPMC12494263 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature