Tunnelling and Underground Space Technology最新文献

{"title":"Stabilisation time analysis method for deep tunnels considering rheological effects and lining influence","authors":"Xu Chen ,&nbsp;Chuan He ,&nbsp;Guowen Xu ,&nbsp;Bo Wang ,&nbsp;Gaoyu Ma ,&nbsp;Jiamin Du","doi":"10.1016/j.tust.2024.106170","DOIUrl":"10.1016/j.tust.2024.106170","url":null,"abstract":"<div><div>In tunnel design, the stand-up time of the surrounding rock and the stabilization time of the rock-structure after support are crucial parameters. These parameters affect excavation methods, excavation cycles, rock reinforcement strategies, and the timing of support installation. Currently, evaluations are largely empirical, based on surrounding rock classification, making it challenging to ascertain the long-term stability of the rock-structure. Utilizing creep damage model theory, we derived the viscoelastic-plastic response of surrounding rock under creep. A method for calculating tunnel support time under various geological conditions was proposed, combining longitudinal deformation curves. The stabilization time of surrounding rock-primary support under different conditions was derived from tunnel support characteristic curves. Key findings include: ① The stand-up time of unsupported surrounding rock decreases with increased tunnel depth, increases with higher GSI (Geological Strength Index), and extends with greater maximum allowable displacement. ② The stabilization time for supported surrounding rock-structure increases as support distance decreases, support time decreases, support stiffness increases, and reserved deformation increases. The sensitivity order of support parameters impacting stabilization time is primary lining support time &gt; safe distance from second lining to face &gt; primary lining stiffness. ③ Analysis of the Leye Tunnel DK504 + 050 section confirmed this method reliability, providing reliable initial data for future section predictions. This study enhances tunnel engineering theory and ensures tunnel construction safety and cost-effectiveness.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"155 ","pages":"Article 106170"},"PeriodicalIF":6.7,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142637885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical simulation and comparative design of non-planar interlocking fibre reinforced concrete bricks for tunnel lining structure under impact loading","authors":"Wenzheng Xu ,&nbsp;Heyang Wu ,&nbsp;Xiaoshan Lin ,&nbsp;Yi Min Xie","doi":"10.1016/j.tust.2024.106184","DOIUrl":"10.1016/j.tust.2024.106184","url":null,"abstract":"<div><div>In this study, the impact behaviour of tunnel lining structures constructed using a novel topological interlocking system with steel fibre reinforced concrete (SFRC) bricks is comprehensively investigated. A sophisticated finite element model is firstly developed to simulate the impact tests on the interlocking SFRC tunnel specimens. The model considers the geometric details of the main components of the test setup, including drop hammer, guide columns, interlocking tunnel specimen, rubber cover, and frames. Furthermore, a newly developed SFRC constitutive model is employed in the present model to accurately capture the dynamic behaviour of SFRC. By comparing the predicted results with experimental data, the developed numerical model has been demonstrated to be highly accurate. Six new non-planar topological interlocking bricks are then developed based on different patterns, and a parametric study is carried out to investigate the effect of geometric parameters on the dynamic response of the topological interlocking SFRC tunnel structures. Finally, recommendations for designing topological interlocking SFRC tunnel segments are provided based on the findings from this study.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"155 ","pages":"Article 106184"},"PeriodicalIF":6.7,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142637796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Investigation into the collapse height of TBM jamming machinery induced by fault fracture zones and the verification of applicability","authors":"Qian Zhang ,&nbsp;Yan Ma ,&nbsp;Yanliang Du ,&nbsp;Lijie Du ,&nbsp;Minyuan Wang ,&nbsp;Sunhao Zhang ,&nbsp;Yaoqi Nie","doi":"10.1016/j.tust.2024.106196","DOIUrl":"10.1016/j.tust.2024.106196","url":null,"abstract":"<div><div>The large-scale collapse resulting from TBM tunneling within fault fracture zones leads to cutterhead and shield jamming. Given the significant gravitational force of the rock mass and ground stress, the collapse height serves as a key identification factor. Starting with the jamming scenarios of the cutterhead and shield, a mechanical expression for the theoretical model of collapse height is formulated. By incorporating numerical model findings on the extent of rock mass displacement deformation due to excavation disturbance, data from the Xianglushan Tunnel are used to verify the alignment between the theoretical model and simulation results. he findings indicate that the theoretical model-derived collapse height threshold for cutterhead jamming is 7.21 m above the TBM, showing a 90 % agreement with the numerical simulation result of 7.98 m and the maximum collapse cavity height measured in the field (8.0 m). The collapse height of 20.46 m for the shield jamming case corresponds to the open TBM scenario, where shield jamming is less likely. Additionally, the theoretically predicted average collapse heights of 5.31 m, 6.57 m, and 7.51 m under other contact scenarios closely correlate with the simulated displacement deformation zone heights of 5.03 m, 6.92 m, and 7.60 m, demonstrating a 94 % concordance. This theoretical model, showing strong applicability, is further extended to account for varying shield lengths (Ld) and contact range scenarios. For a shield length of 6 m, the predicted threshold value of collapse height for shield jamming aligns with both the theoretical predictions and the simulated rock mass displacement range. This research introduces predictive methodologies for addressing collapse-induced jamming incidents within fault fracture zones.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"155 ","pages":"Article 106196"},"PeriodicalIF":6.7,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142637884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study on 3D hydroelastic response of entire long span submerged floating tunnel with catenary-mooring constraint and perpendicular regular waves action","authors":"Zhiwen Yang ,&nbsp;Zechen Wang ,&nbsp;Shixiao Fu ,&nbsp;Piguang Wang ,&nbsp;Ruijia Jin ,&nbsp;Huaqing Zhang","doi":"10.1016/j.tust.2024.106181","DOIUrl":"10.1016/j.tust.2024.106181","url":null,"abstract":"<div><div>Clarifying the hydroelastic dynamic response of submerged floating tunnel (SFT) is an important prerequisite for its safety design. Currently, most of the research focuses on theoretical analysis and numerical simulation, and lack of relevant 3D model tests. In this series of studies, 3D entire long span experiments were carried out to systematically study the hydroelastic response mechanism of the SFT. The practical end constraint, the elastic deformation along the tunnel and the coupling effect between the tube and the mooring system was entirely experimentally simulated. Taking the catenary as the mooring system and perpendicular regular waves action, this paper analyzes the 3D hydroelastic response characteristics of the submerged floating tunnel under different wave periods and end pretension conditions, the tube displacement, acceleration and mooring tension along the tunnel were carefully measured. The test results show that the wave period has a significant effect on the displacement and acceleration of the tube, especially when the wave period is close to the structure natural period, the amplitude reaches the maximum, and the displacement and acceleration of the tube reach the maximum at the mid-span. Both horizontal and vertical displacement and acceleration increase first and then decrease with increasing the relative frequency <em>f/f_N</em> and <em>KC</em> number. With the increase of the end pretension, the maximum displacement or acceleration amplitude decreases, and the response peaks shift to the direction of low <em>KC</em> number. After applying the end pretension, the horizontal displacement and acceleration amplitude of the tube decrease, but the vertical displacement and acceleration amplitude increase. Increasing the end pretension will increase the mooring tension, and the tension amplitude of the waveward side is always higher than that of the leeward side.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"155 ","pages":"Article 106181"},"PeriodicalIF":6.7,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142637886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of critical tunnelling parameters on consolidation-associated long-term greenfield settlement due to shield tunnel in soft ground","authors":"Gang Zheng ,&nbsp;Ruikun Wang ,&nbsp;Huayang Lei ,&nbsp;Xuesong Cheng ,&nbsp;Eng-Choon Leong ,&nbsp;Hualin Du","doi":"10.1016/j.tust.2024.106168","DOIUrl":"10.1016/j.tust.2024.106168","url":null,"abstract":"<div><div>This study investigates the long-term settlement behaviour induced by shield tunnelling in soft ground, employing a case study and numerical modelling to achieve a comprehensive understanding. Soil consolidation plays a critical role in long-term surface settlement, necessitating precise calibration of essential tunnelling parameters such as face pressure and grouting pressure. The findings indicate that soil settlement progressively increases with increasing face pressure <em>P</em>_f and grouting pressure <em>P</em>_g during the excavation of a shield tunnel. Furthermore, for long-term consolidation settlement, it has been established that setting <em>P</em>_f at 90% of the lateral earth pressure <em>σ</em>_xx consistently minimizes settlement across all cover depths. This phenomenon is attributed to the soil arching mechanism, which also reduces the height of the loosened zone at this specific <em>P</em>_f level. Similarly, the optimal <em>P</em>_g is identified to be within the range of 130% to 150% of the vertical earth pressure <em>σ</em>_zz. For cover depths within the loosened zone, the smallest consolidation settlement and loosened zone height are observed at <em>P</em>_g of 150% of <em>σ</em>_zz. Conversely, for shallower cover depths, beyond the loosened zone but within the arching zone, the smallest consolidation settlement and loosened zone height occur at <em>P</em>_g of 130% of <em>σ</em>_zz. This study reveals that adjusting the cover depth significantly influences the reduction in vertical stress and the resulting settlement, demonstrating the importance of tailored grouting pressure calibration for varying depths to limit consolidation settlement.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"155 ","pages":"Article 106168"},"PeriodicalIF":6.7,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142637887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental investigation of natural gas leakage and dispersion characteristics in utility tunnels under the effects of real facility layout and forced ventilation","authors":"Jitao Cai ,&nbsp;Jiansong Wu ,&nbsp;Yuhang Wang ,&nbsp;Chen Fan ,&nbsp;Rui Zhou","doi":"10.1016/j.tust.2024.106187","DOIUrl":"10.1016/j.tust.2024.106187","url":null,"abstract":"<div><div>Natural gas leakage occurring in underground utility tunnels usually poses a significant threat to public safety. In order to prevent unexpected fires and explosions, the evolution mechanism of natural gas leakage and dispersion in utility tunnels is urgently needed. In this study, an experimental apparatus was built to facilitate the understanding of leakage and dispersion dynamics in utility tunnels. Methane with a purity of 99.9% is used as a surrogate for natural gas. A schlieren imaging system with a Z-shaped optical path was designed to visualize the high-speed gas jet. The concentration distribution, alarm time, dilution efficiency, and gas jet image were analyzed under the effect of various facility layouts, ventilation, and leakage rates. The results show that the gas leakage and dispersion process can be divided into three zones: upwind zone, leak zone, and downwind zone, characterized by complicated airflow collision, high-speed get jets, and stable dilution dispersion respectively. Scenario analysis highlights the significance of key facilities, such as cable brackets, in experimental and numerical modeling due to their impact on dispersion trajectories. Higher ventilation rates prove beneficial in reducing peak concentration, hazardous areas, and enhancing purge efficiency. Conversely, higher leakage rates exacerbate the likelihood and severity of gas explosions. Alarm time exhibits a V-shaped distribution relative to the leak point, while purge time correlates positively with sensor positions. These findings are of practical importance in enhancing quantitative risk assessment and designing mitigation strategies for gas leakage accidents, which helps to improve the safety-risk-control capabilities of utility tunnels.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"155 ","pages":"Article 106187"},"PeriodicalIF":6.7,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142637797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study on sealing effect of cement–sodium silicate slurry in rock fracture with flowing seawater","authors":"Changzhi Shao,&nbsp;Guangxuan Zhu,&nbsp;Qingsong Zhang,&nbsp;Shaolong Duan,&nbsp;Rentai Liu","doi":"10.1016/j.tust.2024.106173","DOIUrl":"10.1016/j.tust.2024.106173","url":null,"abstract":"<div><div>Cement–sodium silicate (C–S) slurry has been widely used to prevent water inrush during the construction of submarine tunnels. The diffusion mechanism of C–S slurry in seawater is still unknown. In this study, a series of contrast and orthogonal tests was conducted using a visual fracture grouting device to investigate the effects of the initial flowing water speed, seawater content, grouting rate, roughness, and aperture width of rock fractures on the propagation patterns and sealing effect. The contrast test results showed that seawater has a significant impact on slurry diffusion and fracture sealing. The orthogonal test results indicated that the propagation patterns can be classified into four types according to the experimental results: (1) complete sealing without cavities or water flow channels; (2) incomplete sealing with large cavities but no water flow channels; (3) partial sealing with water flow channels along both sides of the fracture; and (4) failed sealing with obvious water flow channels composed of many cavities. The descending order of factors on the sealing effect was as follows: initial water flow speed, seawater content, aperture width, roughness, and grouting rate. Moreover, the influences of these factors on the sealing effect were revealed. The sealing effect increased with the seawater content and grouting rate, and decreased with the initial flowing water speed, roughness, and aperture width. The results contribute to the understanding of the grouting diffusion mechanism and the design of grouting treatments for water inrush in submarine tunnels to reduce the risk of tunnelling.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"155 ","pages":"Article 106173"},"PeriodicalIF":6.7,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Asymmetric deformation and failure behavior of roadway subjected to different principal stress based on biaxial tests","authors":"Jianping Zuo ,&nbsp;Zongyu Ma","doi":"10.1016/j.tust.2024.106174","DOIUrl":"10.1016/j.tust.2024.106174","url":null,"abstract":"<div><div>The magnitude and direction of stress will affect the failure of roadway. The impact of stress magnitude and direction on roadway failure was investigated using a rock failure system equipped with true triaxial loading, acoustic emission (AE), and digital image correlation (DIC) technologies. The system allowed for the simulation of rock sample failures under various three-dimensional stress conditions, while real-time monitoring was conducted using a high-precision microseismic system. By prefabricating rectangular holes at different angles in sandstone specimens, roadways under different stress effects in engineering can be simulated. Biaxial loading tests were then performed on these prefabricated sandstone cube specimens to observe external fracture characteristics and internal fracture information using acoustic emission equipment. The peak strength of samples with holes is approximately 38–56% of that of intact samples. In the early and middle loading stages, the strain on the surface is on the order of 10^-3. In the later loading stage, the strain on the surface is on the order of 10^-2. The findings indicate that roadway failure primarily involves local particle ejection, fragment spalling, large-scale particle ejection, plate crack buckling, and eventual failure. The ultimate failure mode varies based on stress deflection angles: with no included angle, the roadway exhibits a ’V’ shaped failure zone on both sides, predominantly experiencing tensile failure. At included angles of 30°, 45°, and 60° between stress and roadway axis, the roadway displays a “—” failure pattern along the diagonal, characterized by a combination of tension and shear failure. The extension angle of the“—” failure zone varies depending on the stress deflection angle. At a 90° included angle, the roadway shows a ’V’ shaped failure in the roof and floor, primarily undergoing tensile failure. Real-time monitoring of the strain field evolution around the roadway during failure using DIC method revealed valuable insights. AE events at different deflection angles reflect the progression of micro cracks in the specimen, showing a strong correlation with macro failure. The research outcomes elucidate the mechanisms behind various forms of roadway failure induced by stress deflection and shed light on the failure mechanism at different stress deflection angles.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"155 ","pages":"Article 106174"},"PeriodicalIF":6.7,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Theory and field tests of innovative cut blasting method for rock roadway excavation","authors":"Chengxiao Li ,&nbsp;Renshu Yang ,&nbsp;Jinjing Zuo ,&nbsp;Pin Xie","doi":"10.1016/j.tust.2024.106180","DOIUrl":"10.1016/j.tust.2024.106180","url":null,"abstract":"<div><div>The primary factor influencing the blasting excavation speed of coal mine rock roadways is cut blasting. Traditionally, cut holes are positioned at the lower part of the section, leading to uneven minimum resistance lines for the subsequent row of auxiliary holes after blasting, which results in poor rock fragmentation. In this paper, an innovative concept that cutting area is similar to the rock roadway cross-sectional contour (CSRC) for cut blasting is proposed, which is composed of two parts: layout of cutting holes and charging structure. Firstly, the concept of CSRC is introduced and relevant theoretical models are established. Then, the CSRC cut blasting is studied through numerical simulation and model testing methods. Finally, the CSRC cut blasting and digital electronic detonators are applied on site. The results indicate that arranging cut holes using this method makes the shape of the cutting cavity similar to the cross-sectional profile. And the resistance line of the next row of auxiliary holes becomes uniform, thereby enhancing rock fragmentation near adjacent auxiliary holes. Additionally, the use of discontinuous charges in deep hole excavation significantly improves excavation efficiency and increases the extent of rock damage. The industrial test results further validate that adjusting the layout of cut holes mainly affects rock fragmentation uniformity, the number of boreholes, and the quality of the surrounding formation. Adjusting the charging structure mainly influences the efficiency and depth of blasting excavation. Compared to traditional methods, employing CSRC cut blasting technology significantly reduces the number of boreholes, improves production efficiency, and lowers costs.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"155 ","pages":"Article 106180"},"PeriodicalIF":6.7,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A prediction model for surface settlement during the construction of variable cross-section tunnels under existing structures based on stochastic medium theory","authors":"Xiangfan Shang ,&nbsp;Shengjun Miao ,&nbsp;Hui Wang ,&nbsp;Pengjin Yang ,&nbsp;Daohong Xia","doi":"10.1016/j.tust.2024.106177","DOIUrl":"10.1016/j.tust.2024.106177","url":null,"abstract":"<div><div>When predicting ground surface settlement caused by constructing a new tunnel beneath existing structures, traditional stochastic medium theory inadequately accounts for the effects of abrupt changes in the cross-sectional areas of variable-section tunnels and the presence of existing structures, potentially leading to significant errors. In this paper, an enhanced ground surface settlement prediction model, based on stochastic medium theory, is proposed. The model equates the settlement of the existing structure’s base slab to that of the overlying soil and divides the horseshoe-shaped tunnel cross-section into eight arc segments, which are calculated using a polar coordinate system. Furthermore, the model treats soil loss at the junctions of variable-section tunnels as a linear transition, introduces the concept of a linear transition segment for variable sections, and accounts for the superimposed effects of closely spaced twin-tunnel excavations. Based on this model, a general-purpose calculation program has been developed that enables the rapid prediction of ground surface deformation caused by a variable-section tunnel passing beneath existing structures, simply by inputting engineering parameters. Finally, the accuracy of the prediction model was validated through comparisons with field measurement data, finite element analysis results, and calculations based on traditional stochastic medium theory. The results indicate that the proposed prediction model demonstrates high consistency with field data and finite element analysis results, whereas traditional stochastic medium theory results exhibit significant errors. This model is scientifically valid and provides a reliable reference for predicting ground surface settlement in comparable variable-section metro tunnel construction projects.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"155 ","pages":"Article 106177"},"PeriodicalIF":6.7,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}