Coal seam gas drainage is not only the effective measure for gas outbursts control, but also
has the great significance for the use of gas energy and reduction of greenhouse-gas …

In this paper, the cyclic constitutive equations were proposed to describe the constitutive
behavior of cyclic loading and unloading. Firstly, a coupled damage variable was derived …

A knowledge of permeability evolution with stress is important for the enhancement of
coalbed methane production. In this study, a series of compaction-permeability tests with in …

It is extremely difficult to accurately predict the rock damage evolution during the
underground space development or the deep excavation activity. In this paper, based on the …

Cyclic loading and confining pressure unloading are two common types of disturbance
effects in rock engineering. In this study, a series of triaxial tests under combined …

During deep underground coal mining, coal is typically fractured under high in situ and
mining-related stresses, thus increasing the risk for dynamic disasters. However, knowledge …

Many gas pre-drainage boreholes are generally constructed in coal seams to ensure safe
underground operation. True triaxial experiments were conducted to study the mechanical …

Before a coal mining operation, it is necessary to carry out coal-bed methane (CBM) pre-
extraction to prevent coal and gas explosions, causing accidents. However, gas extraction …

Heat injection is considered to be an effective technique to increase Coalbed methane
(CBM) production, which indicates the important role of temperature in gas flow. In this …

The damage evolution and plastic flow are usually coupled for rocks due to heterogeneity,
which is significant for the design and construction of underground structures. In this paper …