Mengke Liu, Haidong Chen, Xiangjun Chen, Lin Wang, Shuailong Feng
{"title":"A New Model for Calculating Voidage in Goaf Under Roof-Cutting Pressure Relief Mining: Exploring the Influence of Volumetric Strain on Voidage From the Perspective of Finite Element","authors":"Mengke Liu, Haidong Chen, Xiangjun Chen, Lin Wang, Shuailong Feng","doi":"10.1002/ese3.70200","DOIUrl":"https://doi.org/10.1002/ese3.70200","url":null,"abstract":"<p>Roof cutting and pressure relief mining technology has been applied in coal mine enterprises because of its advantages of improving the resource utilization rate. Compared to the previous longwall mining mode, the roof unloading and caving characteristics of goaf have undergone significant changes, leading to different patterns of overlying rock fracture and permeability variation in the goaf. To clarify the flow field characteristics of the goaf under the R-CPR mining mode. Based on the theory of “conservation of mining space,” this paper constructs a voidage model of the goaf based on the theory of body strain and subsidence of the rock layer overlying the goaf, with the theory of body strain and the amount of subsidence as the entry point. The void fraction model of goaf based on volume strain theory is constructed, and the applicability of the model is verified. The results show that the body strain voidage model cut top side voidage is significantly smaller than the uncut top side voidage. The porosity of the top cut side of the bulk strain porosity model is significantly smaller than that of the uncut top side; the stable wind speed of the working face is 0.78 m/s, and the air leakage rate of the goaf is 50.93%. In similar simulation experiments, the wind speed of the working face was stable at 0.72 m/s, and the air leakage rate in the goaf was 49.2%. In the actual project, the test stable wind speed is 0.75 m/s, and the actual goaf air leakage rate of the project is 44.1%, and the overall error is not more than 5%. This study enriches the theory related to voidage in the goaf. It provides the theoretical basis and practical reference for the prevention of air leakage and gas management in the R-CPR mining goaf.</p>","PeriodicalId":11673,"journal":{"name":"Energy Science & Engineering","volume":"13 10","pages":"4674-4689"},"PeriodicalIF":3.4,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://scijournals.onlinelibrary.wiley.com/doi/epdf/10.1002/ese3.70200","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145272812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Performance Analysis of Pulse Detonation Micro Gas Turbines Under Typical Operating Conditions","authors":"Weifeng Qin, Zhiwu Wang, Lisi Wei, Zixu Zhang","doi":"10.1002/ese3.70201","DOIUrl":"https://doi.org/10.1002/ese3.70201","url":null,"abstract":"<p>Considering the benefits of pulse detonation combustion, including low entropy increase, high cycle thermal efficiency, and self-pressurization, a performance calculation model for a pulse detonation micro gas turbine was established using methane as fuel. The study primarily investigated the impact of component parameters, ambient conditions, and load on the power generation efficiency, work capacity, and heat consumption rate of micro gas turbines. The calculation results demonstrated that, compared with traditional micro gas turbines based on isobaric combustion, pulse detonation combustion could significantly enhance the thermodynamic performance of micro gas turbines under various conditions. The power generation efficiency of the pulse detonation cycle initially increased and then decreased as the compressor pressure ratio increased, with the optimal pressure ratio being lower than that of the isobaric cycle. The influence of ambient temperature on the performance of pulse detonation micro gas turbines was significantly greater than that of ambient pressure and humidity. The pulse detonation micro gas turbine could leverage its performance advantages when operating at higher loads. Under the specified operating conditions, the pulse detonation cycle exhibited a power generation efficiency of 35.04%, a unit power of 320.73 kW/(kg/s), and a fuel consumption rate of 0.2044 kg/(kW·h), all of which were significantly higher than those of the isobaric cycle. The results further emphasized the superior performance of the pulse detonation micro gas turbine and provided theoretical support for the development of the gas turbine power generation field.</p>","PeriodicalId":11673,"journal":{"name":"Energy Science & Engineering","volume":"13 10","pages":"4690-4703"},"PeriodicalIF":3.4,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://scijournals.onlinelibrary.wiley.com/doi/epdf/10.1002/ese3.70201","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145272811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Meelan Roopa, Mia Mangaroo-Pillay, Rajenlall Siriram
{"title":"A Systematic Literature Review: An Input-Transformation-Output Model for Coal-Fired Plant Operations","authors":"Meelan Roopa, Mia Mangaroo-Pillay, Rajenlall Siriram","doi":"10.1002/ese3.70174","DOIUrl":"10.1002/ese3.70174","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Purpose</h3>\u0000 \u0000 <p>This study identifies and organizes improvement strategies that enable flexible operations in coal-fired power plants through the lens of an input-transformation-output (ITO) model.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Design/Methodology/Approach</h3>\u0000 \u0000 <p>A rigorous systematic literature review (SLR) process, consisting of ten steps in three stages, was used to extract and synthesize relevant studies from 2016 to 2023. These findings were structured within a customized ITO framework to categorize interventions across operational and strategic levels.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Findings</h3>\u0000 \u0000 <p>The review synthesized 24 high-quality studies, revealing 13 thematic strategies that enhance flexibility in coal-fired operations. These include, among others, optimizing boiler systems, integrating renewable energy, improving control systems, and upgrading water-steam cycles. The ITO model illustrates how external environmental drivers, operational interventions, and performance metrics interrelate to influence plant flexibility. Notably, strategies such as advanced control algorithms, predictive maintenance, and retrofitting of pressure components were shown to reduce emissions, improve ramp rates, and extend plant life while supporting grid stability.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Practical Implications</h3>\u0000 \u0000 <p>The study provides a structured model that practitioners can use to guide retrofitting and operational strategies across input, transformation, and output stages of plant functionality. These insights support informed decision-making for improved energy efficiency, sustainability, and cost-effectiveness in legacy coal infrastructure.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Originality/Value</h3>\u0000 \u0000 <p>Unlike traditional literature reviews, this study presents a multi-dimensional, systems-based analysis that maps improvement strategies to plant operations. The resulting ITO framework serves as a blueprint for achieving operational flexibility, especially relevant to countries like South Africa grappling with energy transitions.</p>\u0000 </section>\u0000 </div>","PeriodicalId":11673,"journal":{"name":"Energy Science & Engineering","volume":"13 9","pages":"4615-4632"},"PeriodicalIF":3.4,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://scijournals.onlinelibrary.wiley.com/doi/epdf/10.1002/ese3.70174","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145038426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Na Chen, Farag M. A. Altalbawy, Dharmesh Sur, Sairah A. Karim, Mamata Chahar, Rajni Verma, Nizomiddin Juraev, Hassan Thoulfikar A. Alamir, Faraj Mohammed, Abed J. Kadhim, Marwa Alhadrawe, Al-Ghasem M. Sina, Aseel Smerat
{"title":"Isolation and Identification of Some Crude Oil-Degrading Bacterial From Soil Contaminated With Crude Oil","authors":"Na Chen, Farag M. A. Altalbawy, Dharmesh Sur, Sairah A. Karim, Mamata Chahar, Rajni Verma, Nizomiddin Juraev, Hassan Thoulfikar A. Alamir, Faraj Mohammed, Abed J. Kadhim, Marwa Alhadrawe, Al-Ghasem M. Sina, Aseel Smerat","doi":"10.1002/ese3.70188","DOIUrl":"10.1002/ese3.70188","url":null,"abstract":"<p>Petroleum hydrocarbons represent a major class of organic pollutants that seriously endanger marine and terrestrial ecosystems upon contamination, highlighting the urgent need for cost-effective remediation methods. Bioremediation, a promising and innovative approach utilizing microorganisms and plants to degrade or stabilize pollutants, has gained increasing attention. This study focused on isolating and identifying crude oil-degrading bacteria from petroleum-contaminated soils in five locations within the Kirkuk oil refinery. Soil samples were analyzed for physical and chemical properties, including organic carbon, lime content, total petroleum hydrocarbon levels, and heavy metal concentrations. After enrichment, bacteria capable of thriving in crude oil-containing media were isolated, resulting in 24 strains selected for molecular identification using DNA extraction and 16S rRNA gene sequencing. The genetic diversity of these strains was assessed, and a phylogenetic tree was created using MEGA version 4 software. The top 10 strains were further evaluated for their degradation capabilities in media with 0.5% crude oil using spectrophotometric and gravimetric techniques. Notable isolates included <i>Rhodococcus jostii</i>, <i>Ochrobactrum intermedium</i>, <i>Achromobacter spanius</i>, and <i>Citrobacter amalonaticus</i>. These bacteria demonstrated significant degradation activity across different oil types, with the highest efficiency recorded in crude oil, followed by heavy and light crude oil, particularly by <i>O. intermedium</i>, <i>C. amalonaticus</i>, and <i>A. spanius</i>. Two microbial consortia, A and B, were formulated based on their degradation performance, with A being optimal for heavy oil and B for crude oil. The bacterial diversity was further analyzed using species diversity indices, confirming a broad range of hydrocarbon-degrading microbes within the sampled soils. Ultimately, the identified strains show strong potential for use in bioremediation strategies aimed at mitigating petroleum hydrocarbon pollution in affected environments.</p>","PeriodicalId":11673,"journal":{"name":"Energy Science & Engineering","volume":"13 9","pages":"4461-4475"},"PeriodicalIF":3.4,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://scijournals.onlinelibrary.wiley.com/doi/epdf/10.1002/ese3.70188","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145038425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Stress Relief Effects of Roof-Cutting at the Junction Zone Between Gob-Side Entry and Stope Within Extra-Thick Coal Seams","authors":"Wenrui He, Fulian He, Wenli Zhai","doi":"10.1002/ese3.70197","DOIUrl":"10.1002/ese3.70197","url":null,"abstract":"<p>Severe deformation and failure of surrounding rock and support systems in gob-side entries are particularly pronounced at junction zone between gob-side entry and stope (JZGS), critically constraining safe and efficient mining operations. This study, conducted at the Panel N8102 of Yongdingzhuang Mine with extra-thick coal seam, employs an integrated methodology combining on-site measurement, numerical simulations and field tests to reveal that the superposition of advanced and lateral abutment stresses fundamentally governs intense ground pressure manifestations in JZGS. The overhanging scope of the triangular prism-shaped strata structure above the gob-side entry and mining stope exerts significant impacts on surrounding rock stability in the JZGS. Implementation of roof-cutting techniques can effectively decrease the loading from suspended strata and lateral abutment stress, thereby reducing the mining pressure in the JZGS. Field validation through hydraulic roof-cutting trials confirms the numerical frameworks, achieving significant reduction in surrounding rock deformation (39.4% mitigation) of the JZGS during panel extraction while ensuring operational safety.</p>","PeriodicalId":11673,"journal":{"name":"Energy Science & Engineering","volume":"13 9","pages":"4586-4602"},"PeriodicalIF":3.4,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://scijournals.onlinelibrary.wiley.com/doi/epdf/10.1002/ese3.70197","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145038423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Juan David Rivera-Niquepa, Jose M. Yusta, Paulo M. De Oliveira-De Jesus
{"title":"Assessing Computational Complexity in Selecting Periods for LMDI Techniques in Energy-Related Carbon Dioxide Emissions: An Alternative Approach","authors":"Juan David Rivera-Niquepa, Jose M. Yusta, Paulo M. De Oliveira-De Jesus","doi":"10.1002/ese3.70187","DOIUrl":"10.1002/ese3.70187","url":null,"abstract":"<p>The Logarithmic Mean Divisia Index (LMDI) decomposition analysis is widely employed to examine the drivers behind changes in carbon dioxide emissions related to energy consumption. This analysis has been applied using single-period, year-by-year, and multi-period time frames worldwide. However, these time frames often overlook trend changes in carbon emission time series, which may lead to inaccurate and biased identification of driving factors. This study replicates previous findings and proposes a novel multi-period methodology for defining time frames in decomposition analysis. The proposed approach addresses the limitations of traditional methods by accounting for trend changes in the time series and performing an exhaustive search to optimally identify the most suitable time frames for LMDI-based decomposition. The methodology comprises two stages: the first generates an exhaustive list of possible time series partitions, and the second determines the optimal partition by minimizing the total mean square error (TMSE) using sequential linear models. The results, supported by computational performance tests, demonstrate that the proposed method effectively identifies optimal time frame definitions, making it particularly suitable for annualized case studies on carbon dioxide emissions decomposition in the context of the energy transition.</p>","PeriodicalId":11673,"journal":{"name":"Energy Science & Engineering","volume":"13 7","pages":"3464-3472"},"PeriodicalIF":3.4,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ese3.70187","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144615523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Qi Wang, Ling Ning, Yun Wei, Pengfei Liu, Liang Fu
{"title":"Investigating the Characterization of Pore Size Distribution and Permeability, Capillary Water Absorption in Porous Media Based on Entropy Theory","authors":"Qi Wang, Ling Ning, Yun Wei, Pengfei Liu, Liang Fu","doi":"10.1002/ese3.70202","DOIUrl":"https://doi.org/10.1002/ese3.70202","url":null,"abstract":"<p>The performance of porous media, such as capillary water migration and permeability, is significantly influenced by the complexity of the pore structure. The pore complexity can be characterized by the fractal dimension of the pore structure (<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <msub>\u0000 <mi>D</mi>\u0000 \u0000 <mi>f</mi>\u0000 </msub>\u0000 </mrow>\u0000 </mrow>\u0000 </semantics></math>) and the fractal dimension of pore tortuosity (<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <msub>\u0000 <mi>D</mi>\u0000 \u0000 <mi>T</mi>\u0000 </msub>\u0000 </mrow>\u0000 </mrow>\u0000 </semantics></math>). In this study, the entropy theory was employed to evaluate the complexity of the pore size distribution in porous media. By considering <i>T</i><sub>2</sub> and porosity, the entropy measures for the pore size distribution entropy (<i>H</i><sub><i>P</i></sub>), global entropy (<i>H</i><sub><i>G</i></sub>) and relative entropy (<i>H</i><sub><i>R</i></sub>) were calculated. Furthermore, the relationships between these three types of entropy and <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <msub>\u0000 <mi>D</mi>\u0000 \u0000 <mi>f</mi>\u0000 </msub>\u0000 </mrow>\u0000 </mrow>\u0000 </semantics></math>, tortuosity, <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <msub>\u0000 <mi>D</mi>\u0000 \u0000 <mi>T</mi>\u0000 </msub>\u0000 </mrow>\u0000 </mrow>\u0000 </semantics></math>, permeability, and capillary absorption coefficient (<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <mi>ϑ</mi>\u0000 </mrow>\u0000 </mrow>\u0000 </semantics></math>) were investigated. Our findings demonstrate that <i>H</i><sub><i>P</i></sub> exhibits a quadratic increase with <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <msub>\u0000 <mi>D</mi>\u0000 \u0000 <mi>f</mi>\u0000 </msub>\u0000 </mrow","PeriodicalId":11673,"journal":{"name":"Energy Science & Engineering","volume":"13 10","pages":"4704-4716"},"PeriodicalIF":3.4,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://scijournals.onlinelibrary.wiley.com/doi/epdf/10.1002/ese3.70202","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145272698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Design and Simulation of a Robotic System Integrated With Flywheel Energy Storage for Power Outage Resilience","authors":"Resat Celikel, Omur Aydogmus, Musa Yilmaz","doi":"10.1002/ese3.70203","DOIUrl":"https://doi.org/10.1002/ese3.70203","url":null,"abstract":"<p>In industrial robotics, it is crucial to ensure the completion of ongoing processes in the event of a power outage. In this study, a robotic system integrated with a solar panel production system was designed using the ABB RobotStudio program. The energy consumed by the robot during a single cycle was calculated within the same software. Additionally, the energy consumption of the motors in the belt and table system was estimated based on real-world systems. To address power interruptions, a flywheel energy storage system (FESS) was designed to ensure the continuation of operations. The FESS is capable of supplying the required energy even at the initial start of the robotic system's mission. A notable aspect of this setup is that the drive systems of the motors operate at 800 V. When functioning as a generator, the FESS delivers this voltage to the DC link of the robotic system by acting as a boost converter. The FESS utilizes a high-speed BLDC motor, and an LC filter is placed between the motor and the inverter. When the motor operates in generator mode, the filter components enable its use as a boost converter. During a single process cycle, the system's speed ranges between 4500 and 3700 r/s. The FESS system was simulated in the MATLAB/Simulink environment, and the results are presented in graphical form.</p>","PeriodicalId":11673,"journal":{"name":"Energy Science & Engineering","volume":"13 10","pages":"4717-4729"},"PeriodicalIF":3.4,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://scijournals.onlinelibrary.wiley.com/doi/epdf/10.1002/ese3.70203","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145272768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zhang Kun, Ma Kailun, Zhang Zhaoyun, Cui Bin, Xu Yajun, Wei Xuntao, Chen Yong, Zhang Zengbao, Kong Xiangjun, Chen Hongyan, Tian Dan, Yi Ran, Du Mingchao
{"title":"Research and Experimental Verification of the Dynamic Pose Analysis Method of Advanced Hydraulic Support in a Fully Mechanized Mining Face","authors":"Zhang Kun, Ma Kailun, Zhang Zhaoyun, Cui Bin, Xu Yajun, Wei Xuntao, Chen Yong, Zhang Zengbao, Kong Xiangjun, Chen Hongyan, Tian Dan, Yi Ran, Du Mingchao","doi":"10.1002/ese3.70139","DOIUrl":"10.1002/ese3.70139","url":null,"abstract":"<p>This study introduces a dynamic pose analysis method for advanced hydraulic supports, driven by the hydraulic cylinder stroke. This method plays a crucial role in the precise control and path planning of the supports. Based on the closed-loop mechanical structure, the advanced hydraulic support was modeled as a 10-degree-of-freedom robotic arm, driven by the left and right leg cylinders. Given the time-sharing driving characteristics, the support was analyzed under two distinct scenarios: those driven by the left and right hydraulic cylinders. A forward kinematic model was established using an improved Denavit–Hartenberg (MD-H) parameter method, and a joint angle-following model was geometrically constructed. By integrating these models, a comprehensive pose analysis framework was developed, which allows for the derivation of the mapping relationship between cylinder strokes and the overall support pose. To validate the proposed model, simulations were conducted for 20 lifting cases to calculate the motion relationships between cylinder strokes and joint angles, followed by corresponding experimental tests. The experimental results demonstrated that the pose error was less than 1.31% and the position error was below 0.27%. These findings confirm that the model accurately reflects the mapping between hydraulic cylinder strokes and the overall pose of the support. Lastly, a motion relationship equation was derived, linking cylinder strokes to the roof pitch angle. This equation provides an intuitive representation of the mapping between active joints and the overall support pose.</p>","PeriodicalId":11673,"journal":{"name":"Energy Science & Engineering","volume":"13 8","pages":"3919-3934"},"PeriodicalIF":3.4,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://scijournals.onlinelibrary.wiley.com/doi/epdf/10.1002/ese3.70139","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144809345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Study on the Mining Pressure Law of Tunneling Roadway in Coal Pillar of Lower Coal Seam in the Mining Hollow Area","authors":"Donghai Jiang, Hui Wang, Tongyang Zhao, Kaixin Zhang, Jianrong Liu, Jiangwei Liu, Hao Lan, Yuantao Yao","doi":"10.1002/ese3.70148","DOIUrl":"10.1002/ese3.70148","url":null,"abstract":"<p>In the downward mining, the goaf of the upper coal seam and the remaining coal pillars will have a negative impact on the stability of the lower coal seam roadway. If the roadway is excavated in the lower coal seam coal pillar, it is more likely to produce mutual superposition effects, which greatly increases the difficulty of roadway surrounding rock control. In view of this situation, based on the actual project on site, the engineering geological survey, theoretical analysis, numerical simulation, field measurement and verification are used to study the stress distribution characteristics of the goaf and the remaining coal pillars in the upper coal seam and the mine pressure law of the surrounding rock of the roadway when the lower coal seam is arranged in multiple roadways, and the safety of the new roadway is verified by field measurement. The results show that from the perspective of the damage degree and stress concentration of the upper coal seam floor, the goaf of the upper coal seam and the remaining coal pillars have no obvious influence on the new roadway in the lower coal seam coal pillar, and the new roadway has no obvious influence on the two existing roadways in the same coal seam. The roof and floor convergence of the newly excavated roadway is about 70 mm, and the two sides are about 106 mm. The deformation does not affect the use of the roadway.</p>","PeriodicalId":11673,"journal":{"name":"Energy Science & Engineering","volume":"13 8","pages":"4011-4023"},"PeriodicalIF":3.4,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://scijournals.onlinelibrary.wiley.com/doi/epdf/10.1002/ese3.70148","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144811103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}