Deep Underground Science and Engineering最新文献

{"title":"Study on fracture parameter calibration and failure characteristics of rock with hole and crack","authors":"Shaochi Peng,&nbsp;Wensong Wang","doi":"10.1002/dug2.70030","DOIUrl":"https://doi.org/10.1002/dug2.70030","url":null,"abstract":"<p>Cracks within the surrounding rock of roadways significantly affect their stability and failure characteristics. Investigating the failure modes of roadways under different crack distribution characteristics provides a theoretical basis for roadway support design. This study, based on the principle of superposition and the Mohr-Coulomb criterion, derives calculation equations for the stress intensity factors of cracks and the radius of the plastic zone under the influence of stress concentration in roadways. Numerical simulations of roadway failures under varying crack distribution characteristics were conducted using PFC^2D. The evolution patterns of crack fracture parameters under different lateral pressure coefficients and material properties were analyzed. The results show that the surrounding rock of the roadway develops tensile and shear cracks due to stress concentration. Under the influence of overburden load, the rock mass cracks evolve into wing cracks and coplanar cracks. The development and intersection of these four crack modes are the primary reasons for differences in roadway-bearing capacity and failure modes. A larger distance between the roadway and cracks, shorter crack lengths, larger crack positional angles, and steeper crack dip angles effectively delay the time and distance of crack intersections, reduce the number of stress curve transitions, shift AE signals to a later stage, and enhance the strength and stability of the roadway. This study provides a foundation for evaluating roadway stability and selecting support parameters.</p>","PeriodicalId":100363,"journal":{"name":"Deep Underground Science and Engineering","volume":"5 2","pages":"597-614"},"PeriodicalIF":5.0,"publicationDate":"2026-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dug2.70030","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148324307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of confining pressure on fracture characteristics and mineralogical behavior of tight sandstone specimens after hydraulic fracturing","authors":"Pankaj Rawat,&nbsp;Narendra Kumar Samadhiya","doi":"10.1002/dug2.70015","DOIUrl":"https://doi.org/10.1002/dug2.70015","url":null,"abstract":"<p>This study focuses on hydraulic fracturing experiments conducted under triaxial conditions on tight sandstone specimens from Shivpuri district, Madhya Pradesh, India. The experiments assessed the effect of confining pressure on specimens with 10 and 12 mm borehole diameters. Breakdown pressure observations indicates that increasing confining pressure results in higher breakdown pressures for both borehole sizes, with slightly higher breakdown pressures for the 10 specimens. Using BSE-SEM (backscattered electron-scanning electron microscope) imaging, the fracture was obtained, and four distributions that are Weibull, Lognormal, normal, and exponential, Anderson Darling coefficient were calculated to determine their goodness of fit corresponding to measured fracture width data from BSE-SEM images. On the basis of the Anderson Darling coefficient, lognormal distribution fitted best for both 10 and 12 mm fracture widths. Further, the Probability density function corresponding to fracture widths for both 10 and 12 mm borehole samples was determined by the maximum likelihood approach through Minitab software to reflect the variability and standard deviation of fractures. The research findings demonstrate that increasing confining pressure leads to decreased values of maximum fracture width, eventual fracture width, process zone width, and fractal dimension. In contrast, closure fracture width and tortuosity values were increased with increased confining pressures. Additionally, photomicrographs were utilized to study micro-crack propagation through quartz and feldspar minerals, highlighting the influence of confining pressures and quartz cementation and the absence of clay inclusions on micro-crack development. These findings contribute to the current understanding of hydraulic fracturing in tight sandstone and open up potential future research directions, such as investigating the influence of sandstone minerals and their fracture characteristics or studying the long-term effects of hydraulic fracturing on tight sandstone specimens.</p>","PeriodicalId":100363,"journal":{"name":"Deep Underground Science and Engineering","volume":"5 2","pages":"482-505"},"PeriodicalIF":5.0,"publicationDate":"2026-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dug2.70015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148324083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Resonance-induced restoration of rock permeability degraded by heavy components of crude oil","authors":"Evgenii Riabokon,&nbsp;Qian Yin,&nbsp;Mikhail Guzev,&nbsp;Mikhail Turbakov,&nbsp;Evgenii Kozhevnikov,&nbsp;Nadezhda Riabokon,&nbsp;Ivan Panteleev","doi":"10.1002/dug2.70020","DOIUrl":"https://doi.org/10.1002/dug2.70020","url":null,"abstract":"<p>Acoustic vibrations applied in the range from 17 to 120 kHz restore the permeability of rocks during filtration of crude oil with heavy components due to a decrease in the injection pressure. The dominant frequency of 28 kHz is revealed, at which the pore space of rocks is unblocked from heavy components of the crude oil most effectively. A mechanism for blocking and unblocking the matrix of sedimentary clastic rock from plugs composed of heavy components present in crude oil is proposed. It is established that heavy components accumulate in narrow pore necks due to the occurrence of force, the nature of which is determined by the curvature of the inner surface of the pore channel. A mathematical model of rock permeability changes from the frequency and amplitude of acoustic vibrations reflecting the resonance effect is developed. A modernized technology for well treatment is proposed.</p>","PeriodicalId":100363,"journal":{"name":"Deep Underground Science and Engineering","volume":"5 2","pages":"556-566"},"PeriodicalIF":5.0,"publicationDate":"2026-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dug2.70020","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148324247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization of cut-hole layout under high in situ stress based on numerical simulation and field tests","authors":"Junjie Zhao,&nbsp;Diyuan Li,&nbsp;P. G. Ranjith,&nbsp;Xinxin Lü,&nbsp;Yanliang Li,&nbsp;Xiaoli Su","doi":"10.1002/dug2.70016","DOIUrl":"https://doi.org/10.1002/dug2.70016","url":null,"abstract":"&lt;p&gt;A well-designed cut-hole layout is crucial for improving drilling and blasting efficiency in deep underground engineering. For this purpose, this study investigates the patterns of blast-induced rock damage under various cut-hole layouts and ground stress conditions through numerical simulations and field tests. The key cut-hole parameters include uncoupling coefficients (&lt;i&gt;K&lt;/i&gt;), the empty hole diameter (&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 \u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;D&lt;/mi&gt;\u0000 \u0000 &lt;mi&gt;e&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;), and hole spacing (&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 \u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;D&lt;/mi&gt;\u0000 \u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;c&lt;/mi&gt;\u0000 \u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 \u0000 &lt;mi&gt;e&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;). In simulations, when &lt;i&gt;K&lt;/i&gt; exceeded 1.15, indicating the use of uncoupling charge, both the rock damage scope and the blast shock wave transmission were significantly suppressed. In contrast, the coupled charge (&lt;i&gt;K&lt;/i&gt; = 1.0) demonstrated better performance in promoting damage. Additionally, large-diameter empty holes (&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 \u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;D&lt;/mi&gt;\u0000 \u0000 &lt;mi&gt;e&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; = 8 or 10 cm) showed pronounced free surface effects on the facing-blasting side, completely breaking the rock mass between the charge hole and the empty holes and effectively guiding crack propagation on the back-blasting side. Hole spacing had an inhibitory effect on effective plastic strain near empty holes; the optimal &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 \u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;D&lt;/mi&gt;\u0000 \u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;c&lt;/mi&gt;\u0000 \u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 \u0000 &lt;mi&gt;e&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000","PeriodicalId":100363,"journal":{"name":"Deep Underground Science and Engineering","volume":"5 2","pages":"367-385"},"PeriodicalIF":5.0,"publicationDate":"2026-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dug2.70016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148324312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic tensile strength and fracture evolution of characteristic shale with bedding and hole using linear regression theory","authors":"Yabo Chai,&nbsp;Ning Luo,&nbsp;Jianan Zhou,&nbsp;Haohao Zhang,&nbsp;Penglong Li,&nbsp;Yu Wang,&nbsp;Cheng Zhai,&nbsp;Tianran Ma","doi":"10.1002/dug2.70053","DOIUrl":"https://doi.org/10.1002/dug2.70053","url":null,"abstract":"<p>In methane in situ explosion fracturing technology, it is critical to investigate the effects of bedding characteristics and perforation holes on the dynamic mechanical properties and fracture behavior of shale reservoirs. Dynamic Brazilian splitting experiments were conducted to investigate the effects of the bedding angle and the central aperture on the dynamic mechanical properties and fracture behavior of shale disc samples with a central hole using a modified split Hopkinson pressure bar device, a three-dimensional digital image correlation system, and high-speed photography. Multiple regression analysis was used to evaluate the influence on the dynamic tensile strength, while fracture evolution characteristics, including area and morphology, were selected to quantify fracture complexity. The results showed that the bedding angle exerted a more pronounced effect on the tensile strength compared to the central aperture, and increasing impact pressure amplified both effects. Tensile fractures predominated across varying bedding angles, while larger central apertures promoted shear fracture formation. The bedding plane facilitated the expansion of shear fractures in its direction, while the central hole primarily guided fracture propagation along the bedding plane. Fracture initiation occurred at the central hole's edge, with subsequent propagation influenced by both the bedding angle and the central aperture. Higher impact pressures resulted in a significant increase in the fracture area, with 90° bedding and larger apertures (8 and 10 mm) resulting in larger areas. These findings provide essential theoretical guidance for constructing efficient shale reservoir fracture networks in methane in situ explosion fracturing, particularly for applications in deep shale formations.</p>","PeriodicalId":100363,"journal":{"name":"Deep Underground Science and Engineering","volume":"5 2","pages":"426-445"},"PeriodicalIF":5.0,"publicationDate":"2026-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dug2.70053","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148324036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A review on rockburst prediction and prevention to shape an ontology-based framework for better decision-making for underground excavations","authors":"Hongchuan Yan,&nbsp;Haijiang Li,&nbsp;Hongqiang Xie,&nbsp;Mingli Xiao,&nbsp;Jianliang Pei,&nbsp;Huaizhong Liu,&nbsp;Jiangda He","doi":"10.1002/dug2.70034","DOIUrl":"https://doi.org/10.1002/dug2.70034","url":null,"abstract":"<p>With underground engineering projects becoming deeper and more complex, the associated safety problems, especially rockburst, have increasingly increased. Despite decades of research, effective management of rockburst continues to be a formidable challenge in underground excavations. This study presents a scientometric visualization analysis of 2449 papers and conducts a comprehensive review of 336 key studies to explore the state-of-the-art developments in rockburst research. With a primary focus on the prediction and prevention of rockburst, this review identifies existing research gaps and proposes a novel framework aimed at addressing these challenges in underground excavations. The results underscore a critical disconnect between advanced prediction methods and engineering practices, which limits the ability of engineers to carry out reliable assessments of rockburst potential. This disconnection prevents the prompt development of targeted prevention strategies, further aggravated by inadequate data sharing across large-scale projects. The review also describes the limitations of relying solely on data-driven methodologies to address the complex challenges in the lifecycle management of underground excavations. To overcome these challenges, this study proposes an innovative framework based on an ontological knowledge base. This framework is designed to integrate multisource data and diverse analysis techniques, exploring the means toward better decision-making in future digital underground projects.</p>","PeriodicalId":100363,"journal":{"name":"Deep Underground Science and Engineering","volume":"5 2","pages":"331-349"},"PeriodicalIF":5.0,"publicationDate":"2026-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dug2.70034","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148324153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Creep properties and constitutive model of diabase in deep water conveyance tunnels","authors":"Zhigang Tao,&nbsp;Pengxiao Guan,&nbsp;Xiaojie Yang,&nbsp;Keyuan Liu,&nbsp;Mingjiu Cai,&nbsp;Hong Yang","doi":"10.1002/dug2.70022","DOIUrl":"https://doi.org/10.1002/dug2.70022","url":null,"abstract":"<p>Aiming at the creep characteristics of the surrounding rock of the Haidong water conveyance tunnel of the Central Yunnan water diversion project and taking the diabase at the tunnel fault zone as the research object, compression creep tests were conducted under a range of confining pressures, revealing the axial and lateral creep characteristics of diabase. Based on the theory of fractional derivative, a nonconstant coefficient Abel dashpot considering damage was established, and the simplified equation form was used to facilitate parameter identification and calculation. By combining a nonlinear Kelvin model, a classical element model, and a simplified Abel dashpot that accounts for damage effects, a constitutive model was established to describe the diabase creep process. The constitutive relations for one-dimensional and three-dimensional creep were provided. The results show that the sample exhibits both a decay creep stage and a steady-state creep stage when the stress level is below the diabase's stress threshold; when the stress level surpasses the threshold, the sample goes through an accelerated creep stage with a quickly growing creep rate and ultimately fails. Diabase mostly experiences axial creep deformation at low-stress conditions, followed by more significant lateral creep deformation under high-stress conditions. Comparing the triaxial compression creep test curve with the theoretical curve revealed that the model more accurately characterized the nonlinear creep properties of diabase.</p>","PeriodicalId":100363,"journal":{"name":"Deep Underground Science and Engineering","volume":"5 2","pages":"386-395"},"PeriodicalIF":5.0,"publicationDate":"2026-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dug2.70022","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148325035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the failure mechanism of the shield excavation face in the sandy cobble stratum under different buried depths","authors":"Hua Jiang,&nbsp;Chongyang Liu,&nbsp;Ao Zhang,&nbsp;Xiaoyan Zhang,&nbsp;Yuhang Li","doi":"10.1002/dug2.70012","DOIUrl":"https://doi.org/10.1002/dug2.70012","url":null,"abstract":"<p>One of the significant challenges faced in shield tunnel construction is the risk of collapse resulting from abrupt changes in soil conditions in advance of the working face, particularly within the sandy cobble stratum. This study aims to effectively manage these sudden variations and to further investigate the failure mechanisms associated with shield tunneling. The limit support pressure, instability patterns, and soil arch ranges at the excavation face under varying burial depths were analyzed using PFC^3D discrete element software, specifically in relation to the shield section of the Beijing Subway New Airport Line 06 cigezhuang~1# wind shaft project. The findings of this research indicate the following: (1) The limit support pressure at the shield excavation face in sandy cobble strata increases with the burial depth ratio; however, the ratio of the limit support pressure decreases as the burial depth ratio increases. (2) A burial depth ratio threshold of 1.0–1.5 suggests that no soil arch forms in the stratum ahead of the excavation face when the burial depth ratio is below this range. Conversely, a soil arch develops when the burial depth ratio exceeds this threshold. (3) When the burial depth ratio is less than the threshold range of 1.0–1.5, the longitudinal instability zone transitions from a wedge shape to a barrel shape, extending to the surface. Conversely, when the burial depth ratio surpasses this range, the longitudinal instability zone changes from a wedge shape to a bulb shape and does not extend to the surface. (4) This paper proposes a calculation model for determining the limit support pressure of the excavation face under both shallow and deep burial conditions in the sandy cobble stratum, providing a calculation formula for the limit support pressure and establishing a reference range for the calculation parameters.</p>","PeriodicalId":100363,"journal":{"name":"Deep Underground Science and Engineering","volume":"5 2","pages":"410-425"},"PeriodicalIF":5.0,"publicationDate":"2026-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dug2.70012","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148324180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation on hard-rock breaking performance and auxiliary mechanism of picks assisted with both-sided high-pressure water jets","authors":"Jingjing Lu,&nbsp;Jiancheng Xiao,&nbsp;Hui Zhou,&nbsp;Xiao Ma,&nbsp;Congcong Hou,&nbsp;Jian Cui,&nbsp;Fujian Yang","doi":"10.1002/dug2.70035","DOIUrl":"https://doi.org/10.1002/dug2.70035","url":null,"abstract":"<p>Double-wheel trench cutters display reduced efficiency while cutting through hard or extremely hard rock strata, leading to significant wear on their picks. A high-pressure water jet-pick combined rock-breaking method (HPC) for double-wheel trench cutters is proposed, addressing the challenges of low efficiency and high pick wear when cutting hard rock strata. The HPC mode integrates high-pressure water jets to precut grooves on both sides of the picks, creating free surfaces that facilitate rock fragmentation. Experiments were conducted with the combination of high-pressure water jet cutting and linear pick cutting under the HPC mode with granite. The HPC rock-breaking efficiency was compared with that of conventional pick-relieved cutting (PRC) and pick-unrelieved cutting (PUC) modes. A numerical model based on the continuum-discontinuum element method was developed to investigate the rock-breaking mechanism with water jet assistance. The mechanism of rock breaking by pick with bilateral water jet assistance has been revealed. The main conclusions are as follows: (1) The HPC mode reduced the average horizontal and normal rock-breaking forces by 36.02% and 48.78%, respectively, compared with PRC, and by 32.07% and 42.85%, respectively, compared with PUC. Furthermore, compared with the PRC and PUC modes, the HPC mode decreased specific energy consumption by 88.58% and 93.84% and increased the coarseness index of rock debris by 159.28% and 189.77%, respectively. These improvements indicate a transition from localized fragmentation to large-chunk stripping during rock breaking, attributed to the free surfaces created by water jet grooving. (2) The free surfaces created by the water jet altered the rock mass displacement vector from radial to horizontal, promoting the formation of Λ-shaped fractures and increasing tensile and tensile-shear fractures. This mechanism reduced the intermediate principal stress and strain energy within the rock mass, reducing the difficulty of rock breaking. The HPC mode thus offers a promising solution for improving the efficiency of double-wheel trench cutters in hard rock excavation, with the potential for broader application in underground diaphragm wall construction.</p>","PeriodicalId":100363,"journal":{"name":"Deep Underground Science and Engineering","volume":"5 2","pages":"581-596"},"PeriodicalIF":5.0,"publicationDate":"2026-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dug2.70035","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148325054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nonsilting transport characteristics of coal slurry in a deep underground fluidization conveying pipeline under the action of a guide vane swirler","authors":"Jiusheng Bao,&nbsp;Shaodi Zhao,&nbsp;Yan Yin,&nbsp;Zhongbin Wang,&nbsp;Shuai Liu,&nbsp;Shirong Ge","doi":"10.1002/dug2.70026","DOIUrl":"https://doi.org/10.1002/dug2.70026","url":null,"abstract":"<p>The depth of coal mining is expected to increase continuously owing to the exhaustion of shallow coal resources. However, with the continuous increase in mining depth, transportation and lifting difficulties in deep mines have significantly increased, and traditional wire rope lifting methods can no longer meet the needs of deep transportation. Based on the principle of pipeline hydraulic lifting, a deep coal fluidization pipeline lifting system has been proposed. To address the problem of particle settlement in the horizontal connection section of large particles, a scheme involving the installation of guide vane-type swirlers in the conveying pipeline is proposed. First, the impact of the guide vane parameters on the liquid flow field and solid particles within the pipeline was studied, and a mathematical model of the characteristic parameters of the swirler was established. Suitable guide vane parameters for the swirler were determined by considering factors such as the alleviation of particle settling, energy utilization efficiency, and the structural strength of the swirler. On this basis, the movement patterns of particles of different sizes in pipelines with and without swirlers were investigated. The study found that under conditions of high velocity and large particle size, the swirler was more effective in improving the slurry flow state within the pipeline. Subsequently, a quantitative method for determining the slurry flow state in the spiral flow pipeline was established, using the particle proportion within the pipeline section as an evaluation index, while considering flow velocity and particle size. Finally, the bench test results show that adding a swirler can reduce the critical nonsilting velocity and resistance loss of the slurry conveying pipeline by 9.0% and 42.9%, respectively, and we elucidate the internal mechanisms behind these reductions.</p>","PeriodicalId":100363,"journal":{"name":"Deep Underground Science and Engineering","volume":"5 2","pages":"539-555"},"PeriodicalIF":5.0,"publicationDate":"2026-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dug2.70026","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148324240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}