Sustainability Commons^™

Characteristics Of The Pore And Seepage System Of Deep Coalbed Methane In The Baijiahai Uplift, Junggar Basin, Xinjiang, Chen Heqing, Yang Zhaobiao, Li Daoqing, Xu Miaomiao, Liang Yuhui, Liu Changqing, Wang Yuqiang

Coal Geology & Exploration

[Objective] Xinjiang boasts abundant deep coalbed methane (CBM) resources, with Jurassic coal seams in the Baijiahai uplift of the Junggar Basin identified as a favorable target area for deep CBM exploration and exploitation. The pore and seepage system of deep CBM directly determines its recoverability. [Methods] Based on appraisal well Caimei 2-004H drilled the most recently in the Xinjiang oilfield in 2023, this study investigated in detail the pore and seepage system of coals in the Jurassic Xishanyao Formation in the Baijiahai uplift using scanning electron microscopy (SEM) observations, mercury injection capillary pressure (MICP), low-temperature liquid nitrogen adsorption, and carbon …

Impacts Of Observation Line Layout Morphology And Survey Point Missing On The Inversion Of Predicted Parameters Of Mining Subsidence, Guo Qingbiao, Yu Qing, Zheng Meinan, Luo Jin

Coal Geology & Exploration

[Objective] Accurate prediction parameters for mining subsidence are important basis for full cycle green coal mining, while inversion based on the subsidence data of observation lines serves as the main method to obtain these parameters. [Methods] To quantitatively analyze the impacts of the observation line layout morphology and survey point missing on the inversion of prediction parameters for mining subsidence, this study developed a probability integral model-based inversion method for these parameters using the chimpanzee optimization algorithm (ChOA). Using this method combined with digital simulation experiments, this study predicted subsidence parameters under six observation line morphologies and survey point missing …

Fracturing Evolutionary Law And Energy Utilization Efficiency Of Green Sandstones Under Different Loading Rates, Zhao Huanshuai, Pan Yongtai, Qiao Xin, Wang Xingyu, Yu Chao, Huang Jiacheng

Coal Geology & Exploration

[Objective] This study aims to explore the fracturing evolutionary laws and energy utilization efficiency of rocks under different loading rates is a pressing issue in the field of rock fragmentation and processing. [Methods] To this end, the microscopic parameters of green sandstones were calibrated based on laboratory tests, followed by the identification of relationships between the macro- and microscopic mechanical responses of the sandstones. Using Particle Flow Code (PFC), this study investigated the stress-strain curves and stress chain distribution of green sandstones under different loading rates. Then, based on the fracturing and crack characteristics, this study analyzed the fracturing evolutionary …

Hydrochemical Characteristics And Genetic Mechanism Of Geothermal Water In The Wandong Geothermal Area Along The Moxi Fault In Western Sichuan, Huang Xun, Zhang Yunhui, Li Xiao, Lyu Guosen, Guo Hongyang

Coal Geology & Exploration

[Objective] Geothermal energy exploitation is identified as a vital way to achieve the goals of peak carbon dioxide emissions and carbon neutrality. The Moxi fault, located in the southern segment of the Xianshuihe fault zone in western Sichuan, boasts abundant geothermal resources, serving as a significant area for subsequent geothermal energy exploitation. [Methods] This study investigated the hydrogeochemistry of the Wandong geothermal area along the Moxi fault, analyzed the water-rock interaction process in the area based on the hydrochemical correlation, and calculated the reservoir temperatures and the mixing ratios of cold and hot water using geothermometers and the silica-enthalpy mixing …

Experimental Study On The Mechanics And Deformation Failure Characteristics Of Multi-Source Coal-Based Solid Waste Cemented Backfill, Yang Ke, Zhang Jiqiang, He Xiang, Wei Zhen, Zhao Xinyuan

Coal Geology & Exploration

[Objective] In order to study the mechanical properties and deformation failure laws of multi-source coal-based solid waste cemented backfill (CBSWCB), the uniaxial compression, acoustic emission response and microstructure test experiments were carried out with 5 types of typical coal-based waste. [Methods] The factors influencing the uniaxial compressive strength of CBSWCB, as well as their interaction, were analyzed, and a four-dimensional spatial visualization model of the factors influencing the compressive strength based on their interactions was established. Besides, the mechanical evolution characteristics and macroscopic deformation failure laws under uniaxial compression conditions were elaborated by referring to the acoustic emission and microstructure …

Application Of Microseismic Monitoring System For Coal Mines To The Prevention And Control Of Water Disasters On Working Face Roofs, Fan Xin, Cheng Jianyuan, Li Sheng, Duan Jianhua, Fan Tao, Li Bofan, Wang Yanbo

Coal Geology & Exploration

[Objective] Increasing coal mining depth in coal mines has caused increasingly prominent risks of water disasters on working face roofs, which restrict the green, safe, and efficient coal mining in China’s coal mines. Therefore, there is an urgent need for new technologies for the monitoring and early warning of these water disasters. [Methods] This study explored the application of the joint well-ground microseismic monitoring system to the prevention and control of water disasters on working face roofs, achieving transparent, intelligent monitoring and early warning of water disaster risks. In this system, microseismic sensor arrays are arranged on the surface above …

Geological Structures Fine Monitoring Using Seismic-While-Tunneling Technique In Wangpo Mine, Zhao Huibo, Qin Si, Chen Chao, Guan Qi, Zhao Xingwei, Che Jianhang

Coal Geology & Exploration

Traditional tunnel seismic advance detection technology is limited by the use of explosives, the need for mining stoppages, prediction speed, detection range, and capabilities, making it challenging to meet the high-precision geological structure detection requirements of intelligent tunneling faces. In response, the seismic-while-tunneling technique utilizes the vibration of the roadheader cutting the coal wall as the seismic source. This method employs real-time data upload, automatic processing, and dynamic imaging. By leveraging information technology and software support, and utilizing real-time continuous super-saturation stacking supported by massive data, the imaging precision of geological anomalies ahead of the mining face is significantly enhanced. …

Pneumatic Directional Drilling Technology And Equipment For Broken-Soft Coal Seams In Underground Coal Mines, Tian Hongliang, Zhang Jinbao, Wang Li, Fang Jun, Wang Jianqiang

Coal Geology & Exploration

[Objective] The geological conditions of coal seams in China are complex, with a wide distribution of broken-soft coal seams, and a large number of wells have the problems of high gas and coal-gas outburst. Currently, borehole gas drainage is an effective measure for preventing and controlling the gas disasters. [Methods] In response to the problems of uncontrollable drilling trajectory, shallow drilling depth, large blind spots of drainage in conventional rotary drilling process of broken-soft coal seams, as well as multiple stuck drilling accidents, great difficulty in drilling and low drilling efficiency in conventional directional drilling processes, the development history and …

Build-Up Rate Prediction Of Rotary Steerable Tools Based On Delay Differentiation, Li Fei, Zhang Nan

Coal Geology & Exploration

[Objective] Accurate build-up rate prediction of rotary steerable tools is a prerequisite to achieve the precise control of tools. In order to grasp the variation law of the build-up rate of the rotary steerable bottom-hole assembly (RSBHA). [Methods] Based on the structural charaeteristics of the tool, the Euler-Bernoulli beam equation method is used to analyz the forces outing on the composite RSBHA. At the same time, the calculation method of the tool deflection angle in different sections and the bit pre-drilling deflection angle was obtained with consideration to the geometric relationship of the bottom-hole assembly, and the distance between the …

Analysis Of Three-Dimensional Nonlinear Fluid-Solid Coupling Vibration Characteristics Of Coalbed Methane Abandoned Well Plugging String, Xu Zhixin, Wan Jifang, Hong Yi, Liu Hangming, Yi Xianzhong, Diao Binbin, Wang Yanbin

Coal Geology & Exploration

[Objective] The plugging quality of cement plug in abandoned coalbed methane wells is critical to preventing pollutant leakage. Current standards for handling these wells involve simple mud pump injection, which often results in cement plugs with issues like particle agglomeration, bubbles, and micropores. These defects reduce the strength of the cement plug and compromise its sealing performance. [Methods] To address this, vibration technology is applied to the plugging operation, using a specialized tool to induce vibrations in the pipe string. This process enhances the fluidity of the cement slurry via the transmission of vibration energy, thereby improving the plugging quality …

Spatial Distribution And Influencing Factors Of Microseismic Events In Unequal-Length Mining Faces In Coal Mines, Zhou Jinyan, Yang Hongzeng, Gao Jietao

Coal Geology & Exploration

[Objective] The varying length of a mining face along its dip direction or adjusting mining significantly increases water inrush risks of the mining face. This study investigate the hazards and influencing factors brought by unequal length arrangements to the mining face is one of the key issues in deepening the research on coal mine water hazard prevention and ensuring the safe mining face. [Methods] With the No. 15240 mining face, consisting of a narrow part, a wide part, and a slope, in the Jiulong Coal Mine of the Jizhong Energy Fengfeng Group as the engineering background, a large amount of …

Development And Application Of A Supercritical Co2 Pulsed Fracturing-Seepage Coupling Test System, Liu Jiajia, Zhang Yunlong, Nie Zishuo, Gao Zhiyang, Xu Wensong

Coal Geology & Exploration

[Objective] To effectively enhance the extraction effects of coalbed methane (CBM), this study proposed a novel approach for fracturing coals (rocks) using pulsation of supercritical carbon dioxide (CO₂) by combining pulsed fracturing with supercritical CO₂ fracturing. [Methods] A true triaxial test system coupling supercritical CO₂ pulsed fracturing with seepage was independently developed, and its primary structure, characteristics, and functions were elucidated. Then, the supercritical CO₂ pulsed fracturing - seepage/acoustic emission monitoring tests under true triaxial conditions were conducted in the laboratory. The test system, controlling the triaxial stress by combining an independent servo system with …

Remote Sensing Monitoring And Spatiotemporal Characteristics Of Co2 And Ch4 Concentrations In Coal-Electricity Production Bases, Xu Yanfei, Chen Yongchun, Li Jing, Liu Xiaozhou, Miao Wei, Zhao Derong, Rui Chengqi

Coal Geology & Exploration

[Objective] CO₂ and CH₄ are identified as the primary greenhouse gases emitted from energy production in coal-electricity production bases. Mointoring these emissions and analyzing their spatiotemporal distribution are essential components of building a carbon monitoring system in the study area. [Methods] This study investigated Huainan City, Anhui Province as an example to explore the spatiotemporal characteristics of CO₂ and CH₄ in coal-electricity production bases. Specifically, this study examined the CO₂ and CH₄ concentrations in the study area based on data from the GOSAT，OCO-2, and Sentinel-5P satellites，determining the column concentration changes and distribution of CO …

Investigation And Comprehensive Utilization Of Resources In Closed Coal Mines In Anhui Province, China, Liu Feiyue, Chen Wanyun, Yang Ke, Duan Minke, Liu Qinjie, Yang Lingyue

Coal Geology & Exploration

[Objevtive] With the continuously intensive exploitation of coal resources and the structural reform of energy supply, many coal mines in Anhui Province have been closed due to resource depletion or backward production capacity. However, the closed coal mines still host resources such as underground spaces, residual coals, gas, mine water, land, and infrastructure equipment. Hence, reutilizing resources in closed coal mines holds significant engineering value and economic benefits. [Methods] Based on the general information and reutilization status of 59 coal mines in Anhui Province that have been closed since 2013, this study analyzed the distribution characteristics, residual resources, and reutilization …

Physical Simulation Experiments On Mining-Induced Water Inrushes From Coal Seam Floors: Advances In Research And Prospects, Zhang Pingsong, Ou Yuanchao

Coal Geology & Exploration

[Objective] Water inrushes from floors are subjected to the superimposed effects of factors such as specific geological structures, water-rock-stress coupling, and mining disturbance, proving complex, concealed, and abrupt. [Methods] Physical simulation experiments can effectively reproduce the environments of the floors and confined water, intuitively present the whole process of both mining-induced fracture propagation in the floors and the path evolution of water inrushes, and obtain multi-source data of all disaster stages in a real time manner. Therefore, such experiments enjoy unique advantages in investigating water inrushes from floors. [Results and Conclusions] This study reviews the research achievements in water inrushes …

A High-Resolution Method For Processing Coal Measures Seismic Data Based On Anisotropic Medium Theories And Its Application, Li Huiting, Chang Suoliang, Zhang Sheng, Guan Wenyuan, Zhao Xing, Wang Weiqian, Tantai Mingjun, Gao Kaixin

Coal Geology & Exploration

[Objective] The increasing importance of the exploration and exploitation of deep resources poses new requirements for high-precision seismic exploration. Given that conventional isotropy-based data processing methods are no longer applicable to the coal-bearing strata with strong anisotropy. [Methods] This study proposed a method for processing seismic data based on theories of both transverse isotropy medium with a vertical symmetry axis (VTI) media and transverse isotropy with a horizontal axis of symmetry (HTI) media. First, to characterize the depositional characteristics of coal-bearing strata, this study analyzed the features of VTI media, revealing that high-order dynamic correction can effectively eliminate anisotropy-induced event …

Investigation Of The Use Of Recycled Concrete Aggregates In Porous Asphalt Mixture, Asad Elmagarhe

USF Tampa Graduate Theses and Dissertations

This study aims to address the national need for using recycled concrete in road pavements. This is especially important in the governmental and corporate sectors, where reducing the cost and carbon footprint of construction projects is a priority. The long-term goal is to meet the public demand for environmentally friendly infrastructure and minimize the harmful effects of waste disposal on humans and the environment.

The project focuses on using recycled concrete aggregate (RCA) in porous asphalt pavement to reduce stormwater runoff, a popular environmentally friendly road design. However, compared to regular dense asphalt mixtures, porous asphalt mixtures (PAM) are more …

Exploration Of New Paradigm For Comprehensive Large-Scale Think Tank Research Issues—Strategic Research Practice Of Ecological Barrier Construction In Western China, Jiaofeng Pan, Lu Zhao, Feng Zhang

Bulletin of Chinese Academy of Sciences (Chinese Version)

The ecological environment in western China is relatively fragile. Play leading role of science and technology to promote the construction of ecological barrier in western China, has immeasurable strategic significance for promoting a new pattern of western development, building a Beautiful China, and promoting sustainable development and long-term stability of China. Chinese Academy of Sciences took the initiative to launch the major consulting project of “strategic research on science and technology supporting the construction of ecological barriers in western China”. This is a comprehensive Think Tank research, which has complex cross-domain, cross-regional, and interwoven characteristics. According to the requirements of …

Editorials For Special Topic “Strategic Research On S&T Supporting Construction Of Ecological Barrier In Western China”

Bulletin of Chinese Academy of Sciences (Chinese Version)

No abstract provided.

Innovative Pathways And Perspectives For Construction Of Ecological Barriers On Loess Plateau, Zhisheng An, Weijian Zhou, Yansui Liu, Zhao Jin, Yunqiang Wang, Baoyuan Liu, Guobin Liu, Zhouping Shangguan, Yihe Lü, Fei Wang, Wanquan Ta, Wenke Wang, Houyuan Lü, Haibin Wu

Bulletin of Chinese Academy of Sciences (Chinese Version)

The ecological barriers on Loess Plateau are crucial components of ecological security strategy framed as a pattern of “Three Zones and Four Belts” in China, and serve as a vital safeguard to reduce the flooding risks of the Yellow River and the safety of the North China Plain. Since the founding of the People’s Republic of China, the construction of the ecological barriers on the Loess Plateau has already gained some remarkable achievements, nevertheless, there are still some challenges upon us, such as intensified risks of extreme climate events and natural disasters, proper threshold of balance between ecological construction and …

Technological Challenges And Development Directions Of Ecological Security Barrier Construction In Yun-Gui-Chuan-Yu Region, Peng Cui, Yongping Yang, Genxu Wang, Bo Zhu, Xuyang Lu, Geng Sun, Xiaoyong Bai, Sirui Zhang, Yonggang Ge, Jiao Wang

Bulletin of Chinese Academy of Sciences (Chinese Version)

The Yun-Gui-Chuan-Yu Ecological Security Barrier is situated in Southwest China, encompassing the provinces of Sichuan, Chongqing, Guizhou, and Yunnan. It serves as a vital water source conservation area and a core zone for biodiversity protection for the Yangtze, Yellow, and Pearl River basins, playing a crucial role in China’s national ecological security. Since the 18th National Congress of Communist Party of China, under the guidance of Xi Jinping’s Thought on Ecological Civilization, the region has made significant strides in water resource protection, soil erosion and mountain disaster control, biodiversity conservation, and ecosystem restoration, resulting in noticeable improvements in environmental quality …

Science And Technology Support For Climate Change Mitigation And Adaptation Over Western China, Huijun Wang, Huopo Chen

Bulletin of Chinese Academy of Sciences (Chinese Version)

In the context of accelerating global warming, the western China has experienced intensified climate extremes, with frequent occurrences of meteorological, hydrological, and ecological disasters. The unpredictability of these events has increased, posing significant challenges to disaster prevention and mitigation as well as sustainable development in these areas. In this context, this study, based on a scientific assessment of the facts and risks of climate change in the western China, has identified several fundamental, critical, and strategic scientific and technological tasks to support the development of the western China in the field of climate change. Corresponding suggestions and measures are also …

Science And Technology Support Ecosystem Protection And Restoration In Western China To Ensure Ecological Security Of The Country, Zhiyun Ouyang, Lingqiao Kong, Binbin Huang, Weihua Xu, Bojie Fu

Bulletin of Chinese Academy of Sciences (Chinese Version)

The western China has developed the Earth’s unique ecosystems, which is not only the main provider of ecosystem products and the important barrier of ecological security in China, but also the key area of ecosystem protection and restoration because of its ecological fragility. In recent years, a series of the major protection and restoration projects of ecosystems have been implemented, and have achieved remarkable progress in western China. Nevertheless, due to its ecosystem instability and unsustainability, ecological security is still facing severe challenges in western China. This study first analyzes the crucial roles of the western region as an ecological …

Biodiversity Conservation In Western China With Scientific And Technological Support: Current Status, Challenges, And Suggestions, Fuwen Wei, Hang Sun, Jiaojun Zhu, Baoguo Li, Gexia Qiao, Shilong Chen, Jiang Zhu, Xiaoge Ping

Bulletin of Chinese Academy of Sciences (Chinese Version)

As a megadiverse country, China has made significant progress in biodiversity conservation in recent years. The western region is a critical area for biodiversity conservation in China, boasting rich species resources and a high proportion of endemic species. However, its ecosystems are fragile and vulnerable to the impacts of multiple factors like climate change and human activities. Scientific and technological support has played a vital supporting role in biodiversity conservation, providing comprehensive support from monitoring and assessment to restoration and decision-making through biodiversity surveys, scientific research, and the establishment of monitoring networks. Nevertheless, challenges remain, including gaps in taxa and …

Strategic Analysis Of Technological Support For Environmental Pollution Prevention And Control In China’S Western Ecological Barrier Region, Yawei Wang, Juan Li, Guibin Jiang

Bulletin of Chinese Academy of Sciences (Chinese Version)

As a crucial pillar of the national ecological security strategic framework, the Western Ecological Barrier Zone demonstrates irreplaceable ecological value in key areas such as water conservation, climate regulation, and carbon sink balance, leveraging its unique geographical endowments and ecosystem services. The governance effectiveness of this region not only directly impacts the advancement of the Beautiful China initiative but also holds significant implications for the comprehensive realization of the Dual Carbon strategic goals. This study focuses on the critical issue of environmental pollution prevention in western China. By elucidating the regional distinctive geographical and climatic characteristics, the study systematically analyzes …

Scientific And Technological Measures To Support Sustainability Of Water Resources In Western China, Jun Xia, Xi Chen, Qiuhong Tang, Hongwei Lu, Shaofeng Jia, Genxu Wang, Jingjie Yu, Jinzhu Ma, Xingcai Liu

Bulletin of Chinese Academy of Sciences (Chinese Version)

Under the combined impacts of climate change and human activities, the ecological barrier regions of western China exhibit significant reductions in solid water storage, increases in liquid water, declining water resource stability and non-steady-state characteristics in hydrological systems. Water allocation risks have increased, making it exponentially more difficult to ensure water security. Transboundary water resource development can lead to spillover risks, requiring urgent research on sustainable water resource use and adaptation strategies. The water cycle in western China is driven by both natural and anthropogenic factors, yet fundamental research on water cycle dynamics and resource management under changing environments remains …

Exploration On Path Of Ecological Protection And Economic Development In Qilian Mountain National Park Region, Xinmiao Tian, Qi Feng

Bulletin of Chinese Academy of Sciences (Chinese Version)

National parks are a kind of special protected areas established under the leadership of the government with the core objective of protecting the integrity of natural ecosystems and biodiversity, which emphasizes the balance between human activities and nature protection in order to achieve sustainable coexistence of human being and nature. The construction of a system of nature reserves with national parks as the core is a major breakthrough progress in the institutional framework of China’s ecological civilization, and a key area for promoting the construction of Beautiful China and realizing the modernization of harmonious coexistence of human being and nature. …

Towards 5th World Congress Of Biosphere Reserves: Opportunities And Recommended Actions For China, Yijie Xian, Qiang Fang, Ning Liu, Xiangjun Chen, Yan Zhuang, Ding Wang, Qunli Han

Bulletin of Chinese Academy of Sciences (Chinese Version)

The holding of important international conferences in science and technology can generally bring multiple benefits for the host countries, such as developing strategy in the area of international cooperation. One example comes from the 5th World Congress of Biosphere Reserves due to be held in Hangzhou, China from September 22–27, 2025. This study summarizes the history of previous congresses and the system of Man and the Biosphere Programme (MAB) in which the congresses are located. Significance of the 5th Congress can be found as increasing the global engagement and international influence of MAB, and advancing the achievement of the United …

Enhancing Integrated Observation Network Of Multi-Spherical Interaction In Zoige Wetland And Source Area Of Yellow River Supports Protection Of Yellow River Water Tower, Xianhong Meng, Lunyu Shang, Zhaoguo Li, Shaoying Wang, Lele Shu, Hao Chen, Lin Zhao, Peixi Su, Yu Zhang, Shihua Lyu

Bulletin of Chinese Academy of Sciences (Chinese Version)

An integrated observation network for the energy-water-carbon cycle, with the Zoige wetland and grassland as the focus and covering the source area of the Yellow River (YRSR), has been established, which systematically revealed the characteristics of ecosystem evolution and carbon cycle in grassland and wetland ecosystems of the Zoige Plateau from the leaf-community-ecosystem-regional scales and its response mechanism to climate change, and accordingly, the ecological monitoring and restoration techniques for different types of degraded grassland based on the degradation of the alpine grass mattic epipedon were established, which significantly reduced the cost and enhanced the sustainability of the ecological management. …

Zoige Plateau Wetlands Ecosystem Research Station, Chinese Academy Of Sciences, State Key Laboratory Of Cryospheric Science And Frozen Soil Engineering, Northwest Institute Of Eco-Environment And Resources, Chinese Academy Of Sciences

Bulletin of Chinese Academy of Sciences (Chinese Version)

No abstract provided.