Search

To clarify the occurrence patterns of coal and gas outburst accidents, statistical analysis was conducted on coal and gas outburst accidents in China from 1950 to 2022 from the spatial and temporal dimension, and preventive measures and suggestions were proposed. The research results indicate that the temporal distribution pattern of coal and gas outburst accidents in China from 1950 to 2022 can be divided into three periods: a period of significant increase (1950-1980), a period of continuous improvement (1981-2000), and a period of stable decline (2001-2022). The spatial distribution pattern is wide range, relatively concentrated, more in the south and less in the north, and serious in the south and slight in the north. The number of coal and gas outburst accidents gradually decreases over time, and the ratio of the number of deaths to the total number of deaths in coal mine accidents fluctuates and increases over time. The spatial distribution of coal and gas outburst mines is generally characterized by more in the south and less in the north. The research results provide a basis for the prevention and control of coal and gas outburst accidents in China. [ABSTRACT FROM AUTHOR]

[Objective] The three prefectures of Sichuan (Liangshan Yi Autonomous Prefecture, Ganzi Tibetan Autonomous Prefecture and Aba Tibetan and Qiang Autonomous Prefecture) have fragile ecological environments and frequent geohazards, whereas slopesurface vegetation has the role of water storage and foundation consolidation. The study of the dynamic change of vegetation cover and key drivers in this region can help predict the robustness of ecological structure and prevent geohazards. [Method] MODIS remote sensing data from 2002 to 2022 were selected to analyze the development trend and transfer of vegetation cover based on transfer matrix and trend analysis method, and the influence of each driving factor on vegetation cover was studied through correlation analysis and geodetection model. [Result] The different vegetation cover in the study area had a tendency to evolve to higher cover, but the overall tendency was stabilized with the increase of time, and the influence of meteorological factors, such as air temperature, was slightly larger than that of rainfall, and both factors had a facilitating effect on the vegetation cover; The combined effect of natural and human factors was the main reason for the differences in the spatial distribution of vegetation cover in the three states of Sichuan, and elevation and land use were the two controlling factors of vegetation cover. Elevation and land use were the two controlling factors of vegetation cover, and natural factors had a more significant impact on vegetation cover in the study area, and the superposition of different drivers explained vegetation cover more strongly than the role of a single factor. [Conclusion] The study suggest that the recovery of vegetation cover at high altitude should focus on the temperature tolerance of vegetation and strictly control the over-exploitation and utilization of natural space by human beings, and that the factors affecting vegetation cover should be improved in a multi-dimensional way. [ABSTRACT FROM AUTHOR]

Lala copper mine is located in the Sichuan-Yunnan stress zone. Since the shallow resources are close to the end of mining, it has gradually changed from open-pit mining to underground mining. Due to the complex geological conditions of deep mining, the deep mining area of Luodang will face the problem of in-situ stress in the mining process. The characteristics of the deep in-situ stress field in the Luodang mining area of the Lala Copper mine were taken as the research object, the in-situ stress tests of 10 boreholes by stress relief method, and 22 groups of indoor physical and mechanical tests of surrounding rocks were carried out. The rock burst prediction analysis of the deep mining area was completed by 3 stress criteria of the national standard method, Barton method and the Tao Zhenyu method. The results show that the in-situ stress was distributed discreetly in the shallow part and increased linearly in the deep part. The direction of maximum principal stress is discrete. The degree of rockburst increases gradually with the depth, distributed discretely in the shallow part and gradually concentrated in the deep part. The phenomenon of a strong rockburst may occur at the elevation of 1780m in the east area. Combined with the distribution characteristics of faults and test points in the mining area, the influence of faults and stratum on the in-situ stress test results is pointed out. It can provide a useful reference for deep disaster prevention and safe mining of similar metal mines. [ABSTRACT FROM AUTHOR]

This paper uses various channels to collect the data of earthquake disasters in 2022, and collates the global seismic activities and earthquake disasters in 2022. The change curves of global disaster earthquake frequency and casualties in recent 20 years and the distribution map of disaster earthquakes in 2022 were drawn. By summarizing the earthquake information and disaster conditions causing casualties, a detailed analysis of major earthquake disasters was made. The main characteristics of global earthquake disasters in 2022 were summarized, and major earthquake events in Afghanistan were listed. Compared with last year’s earthquake, the number of casualties caused by earthquake disasters in 2022 has decreased, and the disaster earthquakes are characterized by concentrated casualties and frequent secondary disasters. In view of the prominent causes of earthquake casualties, this paper puts forward corresponding earthquake disaster prevention measures and suggestions.

The China-Pakistan Economic Corridor is of great importance in the Belt and Road Initiative. Meteorological and hydrological disasters frequently occur under the background of global change in the China-Pakistan Economic Corridor region. Risk assessment of meteorological and hydrological disasters can greatly contribute to disaster prevention and mitigation in this area. In this review, the integrated risk assessment was performed on the magnitude and likelihood of potential losses caused by hydrometeorological disasters (such as floods, droughts, terrestrial rain, and extreme high/low temperatures). Specifically, a systematic framework of risk assessment was constructed, where the hazards, exposure, and vulnerability were taken as the factors of increased risk, whereas, resilience was a factor of reduced risk. Meteorological and hydrological data was collected from 1961 to 2015, including the maximum and minimum temperatures, and precipitation, as well as the standardized precipitation evapotranspiration index (SPEI). The terrain data (such as elevation and slope) was supplemented with socio-economic indicators, including population density, population structure, proportion of cultivated land area, cropped area, road density, and GDP. A weighted sum method was proposed to integrate the subjective analytic hierarchy process and objective entropy theory (analytic hierarchy process-entropy weight methodology), in order to obtain the weights of hazard and vulnerability indicators. Finally, the integrated risk assessment of meteorological and hydrological disasters was conducted using the risk matrix and Borda count method. The region was classified into different risk levels. The results indicate that: 1) The high-risk areas of hydrometeorological disasters were located mainly in Sindh and Punjab Provinces of Pakistan, covering approximately 9% of the total area of the China-Pakistan Economic Corridor. 2) The comprehensive vulnerability of the exposed elements showed that Balochistan, Sindh, Punjab, and Khyber Pakhtunkhwa Provinces in Pakistan shared relatively higher vulnerability levels, while Kashgar in China exhibited a relatively lower vulnerability level. The higher exposure level in Punjab was attributed to the high population density. The high sensitivity level was found in the eastern part of Sindh and the western part of Balochistan. However, the recovery capacity in Punjab was relatively high, which reduced the overall vulnerability. 3) Different regions of risk levels were divided using the risk matrix method. High-risk areas were distributed mainly in Sindh Province, the northern and southern regions of Punjab Province, the part areas of Khyber Pakhtunkhwa Province, and the western region of Balochistan Province. Meanwhile, the low-risk areas were distributed mainly in Gilgit-Baltistan (northern region) of Pakistan and Kashgar region of China. The areas with the low, moderate-low, moderate, and high integrated risk levels accounted for 14.09%, 17.27%, 37.70%, and 30.94% of the total, respectively. The percentage of high-risk zones was 66.50%, 60.00%, and 47.57%, respectively, in Sindh Province, Azad Kashmir in Pakistan, and Punjab Province. 51 counties were classified as the high-risk category at the county level. Furthermore, the highest comprehensive risk levels were found in Islamabad and Lahore of Pakistan after risk elimination using the Borda count method, whereas, the lowest comprehensive risk levels were in the Wuqia County of China and Ziarat County of Pakistan. The findings can also provide valuable technical references for the prevention and mitigation of hydrometeorological disasters in the China-Pakistan Economic Corridor. [ABSTRACT FROM AUTHOR]

Copyright of Progress in Earthquake Sciences is the property of China Earthquake Administration, Institute of Geophysics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to carry out coal mine production scientifically, safely and efficiently, and improve the overall production level of coal mine safety in Guizhou Province, this paper applies statistical methods to carry out the analysis of coal mine safety status in Guizhou Province from the six aspects of “the status of coal mine safety accidents in the province”, “the nature and scale of coal mine enterprises”, and “the level of coal mine gas”, “coal seam spontaneous combustion level”, “coal dust explosion hazard”, and “coal mine hydrogeological conditions”. The main problems include “high levels”, “severe gas disasters and huge hidden of gas hazards”, “the greater threat of spontaneous combustion of coal seams”, “the higher risk of coal dust explosion”, and “the slightly higher risk of water hazards”. At the same time, in response to the main problems of coal mine safety in Guizhou Province, the countermeasures from three aspects of disaster prevention and control are “accelerate the adjustment of the coal industry’s structural system”, “establish a disaster prevention and control system that focuses on gas prevention and the prevention and control of other disasters”, and “pay attention to Bijie, Zunyi, Liupanshui, Anshun, southwest Guizhou.

Copyright of Railway Investigation & Surveying is the property of Railway Investigation & Surveying Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Hydrogeology & Engineering Geology / Shuiwendizhi Gongchengdizhi is the property of Hydrogeology & Engineering Geology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of New Architecture is the property of New Architecture Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The high slope geological disaster is easily happened, and it can block the transportation and delay the disaster relief in choke points of mountainside roads. Considering site condition, construction difficulty, tunnel safety, structure reliability, convenience and waterproof, the hangar tunnel scheme was applied in the section of Longsheng-Ziyuan road line. The finite element analysis software was used to calculate the forces of hangar tunnel structure under different situations. The results show that the force of the main parts of hangar tunnel is in safety range. The structure design with high force is optimized to enhance the safety factor of hangar tunnel. After experiencing high slope disasters of landslides and falling rocks during the operation phase, no obvious diseases are found in the arched hangar tunnel structure, and the traffic on the section is not affected. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Heilongjiang University of Science & Technology is the property of Journal of Heilongjiang University of Science & Technology Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Engineering Geology / Gongcheng Dizhi Xuebao is the property of Journal of Engineering Geology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

On account of the nation basic research program of china (973 Program)，theory and method research of geological disaster prevention on high-intensity coal exloitation in the west areas，the total research route and related research prograss of western high-intensity coal exloitation geological disaster on four aspects of geological conditions，formation of geological disaster，evalution method and prevention has been formed.The stratum structure of coal rich region and characteristic of sediment dynamics had been reseached by the study of hydrogeology and structual geology research of jurassic-cretaceous in western coal rich region；And base on the behavior study of mining dynamics，the mechanism of large roof shear and sand-inrush had been found. Also the mining theory and method of major geological disaster and evironment damage also had been studied out. This paper ，which combines the geological disaster preventing and ecological environment protection organically，solves the key problem that had constrained western coal exploitation from headstream，can provide theoretical basis for safe and efficient green mining of western coal resources in long term and large scale. [ABSTRACT FROM AUTHOR]

Copyright of Nankai Journal: Philosophy, Literature & Social Science Edition / Nankai Xuebao: Zhexue Shehui Kezue Ban is the property of Nankai Xuebao Bianjibu and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)