However, to integrate and optimise coal extraction and methane drainage design, particularly in the multiple coal seam environment with low permeability which is common in China, it is important to understand the dynamic interaction between strata, water, and gas desorption and migration during mining in a large scale as shown in Fig. 2.
The model takes into account the mass and heat transfer between the strata, water, machinery and the ventilation air.
Surface waters (0 200m) were divided into 50m strata, waters between 200 and 1000m deep into 100m strata, waters from 1000 to 6000m deep into 200m strata, and waters over 6000m deep into 1000m strata.
The dissolution of limestone strata alters water flow routes over time, generating new connections between formerly disjunct populations and severing others in the process.
This chapter focuses on certain readily quantifiable aspects of skin: blood perfusion, pH, thickness of strata, protein, glycosaminoglycan, water, and lipid content.
This in turn requires a detailed understanding of mining induced strata movement, ground water and gas flow dynamics, and the interaction between goaf gas, drainage and mine ventilation.
Co-extraction of coal and methane requires a detailed understanding of mining induced strata movement, ground water and gas flow dynamics, and the interaction between goaf gas, drainage and mine ventilation.
To study the impact of modern coal mining on overlying strata and its water bearing conditions, integrated time-lapse geophysical prospecting integrating 3D seismic, electrical and ground penetrating radar method were used.
The integrated time-lapse geophysical monitoring studies the spatial evolution pattern of strata and its water bearing under modern coal mining condition through repeated 3D seismic prospecting, electrical prospecting and ground penetrating radar prospecting at different time periods.
Due to integrated time-lapse geophysical prospecting technology has extra time dimension which makes up the deficiency of static analysis of conventional geophysical methods, it can better highlight the dynamic changes of modern coal mining induced overburden strata and its water bearing conditions.
The alkaline chemical agent was injected into the strata, then affected by the factors such as formation temperature, pressure, ion and pH of the injection system and took place in various reaction with strata rock and formation water.
