Abstract The purpose of underground methane drainage technology is to prevent disasters and enable the efficient use coal mine (CMM), sealing depth a key factor that affects performance drainage. In this work, layouts in-seam crossing boreholes are considered analyze stress distribution failure characteristics roadway surrounding rock through numerical simulation field investigation determine reasonable depth. results show depths plastic elastic zones in two experimental mines 16 20 m...

The foundation of study on regional environmental carrying capacity is the detection vegetation changes. A case Northeast China, we, with support normalized difference index (NDVI) MOD13A3 (MOD13A3-NDVI), use a three-dimensional cover model (3DFVC) to acquire from 2000 2021. Vegetation trends are then monitored by spatio-temporal analysis models including empirical orthogonal function (EOF), Sen’s slope (Sen), Mann-Kendall test (MK) and Hurst (Hurst). Additionally, through multi-scale...

The assessment of ecological resilience in arid regions is crucial for understanding and mitigating the impacts climate change human activities, ensuring sustainable management these vulnerable ecosystems. Taking Economic Belt on Northern Slope Tianshan Mountains (EBNSTM) as research area, a multi-dimensional evaluation model coupling vulnerability, health, connectivity was used to explore spatiotemporal variation driving forces resilience. Firstly, sub-item conducted from three aspects,...

This study examined the influences of crushing on microporous and ultramicroporous structures coal by low-pressure CO2 adsorption (LPGA-CO2). Many replicate experiments were carried out adjusting equilibrium time interval to avoid influence disequilibrium test results. The results indicated that using same is unsuitable for adsorbents with a slower rate when comparing characteristics samples different kinetics (adsorbent, temperature, particle size, etc.). Additionally, (>0.3 mm) are not...

Introduction: Vegetation is the main factor of ecological stability, but construction largescale corridor projects will bring some damage to vegetation. Methods: Based on NDVI, temperature and precipitation data growing season from 1990–2021 (June September), this paper uses maximum synthesis method, trend analysis correlation method coefficient variation study spatial-temporal changes driving factors NDVI in past 32 years, taking 30 km belt buffer zone along Lan-Xin Railway as research...

Taking the northern slope of Tianshan Mountains (NSTM) in Xinjiang as research area, this study analyzes changes Production–Living–Ecological (P-L-E) Spaces and their Ecological Environmental Effects, providing a basis for optimizing spatial pattern P-L-E regional ecological environment protection area. Based on land use data DEM data, various methods were used analysis. These include transfer matrix, quality index, hot spot analysis, contribution rate, Terrain Position Index. The analysis...

This study analyzed the pore characteristics of coal after heat treatment under air and vacuum conditions using low-temperature gas adsorption (LTGA) measurements. The removal moisture significantly increases micropore mesopore volumes results in a reduction surface fractal dimension D1 an increase structure D2 mesopore. Volatile emission leads to formation ultramicropores has pore-expanding effect on small mesopores. enlarged mesopores result rougher better connectivity. Thermal expansion...

Coal and gas outburst accidents pose a serious threat to safe coal mining. pulverization transportation are integral outbursts, aiding in understanding outbursts process holding great potential for elucidating mechanisms. However, the lack of on-site sample makes it challenging assess characteristics during outbursts. We collected samples from forefront five sites typical tectonic areas over past decade. Three powders blocks underwent particle size, low-pressure N2/CO2 adsorption...

Diffusion is the main migration form of coal seam gas. This paper establishes a conceptual diffusion model to describe microdiffusion process accurately based on and pore scale. First, low-pressure carbon dioxide nitrogen adsorption experiments were used obtain structure characteristics ten samples. Combining experimental results with literature, research determines space, i.e., network size range 1.5~100 nm. Second, principles different forms, space further divided into three parts,...

Diffusion is the primary migration form of coal seam gas. This paper establishes a conceptual diffusion model to describe microdiffusion based on and pore scale. First, researchers obtained structure characteristics 10 samples through low-pressure carbon dioxide nitrogen adsorption experiments. Through quantitative calculations literature collection, it determines main space, that is, network pores ranging from 1.5 100 nm. Second, space further divided into three parts: 50 nm, 70 where...

Abstract The purpose of underground methane drainage technology is to eliminate disasters and enable the efficient use coal mine (CMM). sealing depth a key factor that affects performance. In this work, layouts bedding crossing boreholes were considered analyze stress distribution failure characteristics roadway surrounding rocks through numerical simulation field investigation determine reasonable depth. results demonstrated depths plastic zone elastic in Xutuan Qinan mines 16 m 20 m,...