Underground coal mining is characterized by the formation of extensive pillars. Coal pillars
serve various purposes, and their instability failure characteristics play a vital role in safety …

A large number of abandoned mines with sizeable underground space resources were
formed in China. Meanwhile, for an operational mine, the protection and utilization of mine …

The 110 mining method, an emerging and innovative nonpillar longwall mining method, can
dramatically increase coal recovery rates and reduce entry accidents. One of the core …

This study presents a comprehensive field investigation of the ground response of a
gateroad subjected to high stress induced by extracting a 17 m-thick coal seam. The test site …

The failure and design of coal pillars have always been the focus of research in the field of
mining engineering, and there are often many water resources in goafs with rich aquifers …

Hydraulic fracturing (HF) is one of the most effective stimulation techniques to enhance
reservoir permeability. The efficiency of an HF fluid injection depends on the pre-existing …

Broken rock and coal—residual coal, plus material from the immediate roof and overlying
strata—fill in the goaf, in an area termed the caving zone. Due to its high porosity and …

Hydraulic fracturing is known to be one of the most effective stimulation techniques to
enhance reservoir permeability. A hydraulic fracture (HF) fluid injection's efficiency largely …

High excavation-induced stress concentration and strong mining/tunneling disturbance are
prominent conditions in deep excavations, and often present a coupled process to induce …

Extraction of multiple seam using fully mechanized coal mining technology caused severe
deformations in the lower coal seam roadways in Zhaiyadi Coal Mine in Shanxi Province …