Proceedings of the Institution of Civil Engineers-Geotechnical Engineering最新文献

A case history of monitoring a wide pile group Part I: geology, single pile analysis and testing, and monitoring data 宽桩群监测案例 I 部分：地质、单桩分析和测试以及监测数据

IF 2.2 4区工程技术

Proceedings of the Institution of Civil Engineers-Geotechnical Engineering Pub Date : 2024-04-29 DOI: 10.1680/jgeen.23.00001

Stephen Buttling, Bengt H. Fellenius, Naruedol Pinijpol

{"title":"A case history of monitoring a wide pile group Part I: geology, single pile analysis and testing, and monitoring data","authors":"Stephen Buttling, Bengt H. Fellenius, Naruedol Pinijpol","doi":"10.1680/jgeen.23.00001","DOIUrl":"https://doi.org/10.1680/jgeen.23.00001","url":null,"abstract":"This is the first of two papers on a wide pile group. In this part, the geology and a geotechnical model of the site are presented, along with the design of a single pile, analysis of a static loading test, and some dynamic tests. The response of the piled foundations comprising 399 bored piles supporting three 70-storey towers on a common mat was monitored over nine years. The records consist of results of a static loading test to 3.5 times the sustained load, dynamic tests of four piles, and monitoring the development of load in 15 piles and settlement of 40 points during construction and nine years following. At end of construction, the perimeter piles received more load from the towers than did the interior piles and the mat settled on average 90 mm. At the end of the monitoring period, due to the general subsidence, the average settlement of the mat had increased by 50 mm. Most of the settlement is considered to originate from the compression of the soil layers below the pile toe level. A subsequent paper will present the analysis and design of the wide pile group, and the numerical analysis of the static loading test on a single pile and of the wide pile group.","PeriodicalId":54572,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Geotechnical Engineering","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140836174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Torsional vibration of a tapered pile considering circumferential support of surrounding soil 考虑周围土壤圆周支撑的锥形桩的扭转振动

IF 2.2 4区工程技术

Proceedings of the Institution of Civil Engineers-Geotechnical Engineering Pub Date : 2024-04-05 DOI: 10.1680/jgeen.23.00102

Zhenya Li, Xianbin He, Chiheng Zhao, Yuqian Xi, Cun Zhang

{"title":"Torsional vibration of a tapered pile considering circumferential support of surrounding soil","authors":"Zhenya Li, Xianbin He, Chiheng Zhao, Yuqian Xi, Cun Zhang","doi":"10.1680/jgeen.23.00102","DOIUrl":"https://doi.org/10.1680/jgeen.23.00102","url":null,"abstract":"The tapered pile is usually divided into finite segments along the vertical direction due to its variable cross-section when investigating its torsional dynamic characteristics. However, an annular projection would be formed at the contact surface of the adjacent pile segments due to the difference in radius, through which the surrounding soil will apply the circumferential support on the pile segment. In this study, the Voigt model is adopted to model the circumferential support of the surrounding soil acting on the annular projection. On this basis, an amended impedance function transfer method is established combining with the circumferential stress equilibrium equations and circumferential displacement continuity conditions at the contact surface of the adjacent pile segments. The shear complex stiffness transfer method is employed to consider the construction disturbance during pile installation. Then, an improved analytical solution for the torsional vibration of the tapered pile considering the circumferential support of the surrounding soil is established by solving the equations for the soil and pile. Based on the solution, the torsional vibration of the tapered pile is investigated and the influence of the circumferential support of the surrounding soil is revealed under different pile parameters and construction disturbance conditions.","PeriodicalId":54572,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Geotechnical Engineering","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140581625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Applicability of construction dewatering techniques for randomly fractured rock 施工排水技术对随机破裂岩石的适用性

IF 2.2 4区工程技术

Proceedings of the Institution of Civil Engineers-Geotechnical Engineering Pub Date : 2024-03-26 DOI: 10.1680/jgeen.23.00005

Hisham T. Eid, Mohammed Z. E. B. Elshafie, Barry O'Sullivan, Mohamed E. Khalil, Alhassan Mahmoud, Reiner Stollberg

{"title":"Applicability of construction dewatering techniques for randomly fractured rock","authors":"Hisham T. Eid, Mohammed Z. E. B. Elshafie, Barry O'Sullivan, Mohamed E. Khalil, Alhassan Mahmoud, Reiner Stollberg","doi":"10.1680/jgeen.23.00005","DOIUrl":"https://doi.org/10.1680/jgeen.23.00005","url":null,"abstract":"Through analysing a significant number of case histories, ranges of applications of dewatering techniques for randomly fractured rock are proposed in terms of the rock mass permeability and the required drawdown. The cases analysed, which cover a wide range of construction activities and associated dewatering depths, provide one of the most comprehensive studies of dewatering techniques on randomly fractured rock to date. Comparison of the ranges suggested for dewatering in fractured rocks with those developed for excavations in soils is presented. To fit the construction dewatering systems in rock, a modification is proposed for the drawdown diagram that is widely used in practice for soils, and for the limited available general recommendations presented for chalk. Consequently, recommendations are made to improve the procedure of designing and executing these systems. In addition, a dewatering technique is proposed, which allows for construction to proceed in a wet condition, taking into account rock shear strength and the excavation geometry.","PeriodicalId":54572,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Geotechnical Engineering","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140316263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sensitivity investigation of drilling efficiency to operational parameters of a drifter 钻探效率对钻机运行参数的敏感性调查

IF 2.2 4区工程技术

Proceedings of the Institution of Civil Engineers-Geotechnical Engineering Pub Date : 2024-03-21 DOI: 10.1680/jgeen.23.00190

Qiang Shen, Yujie Wang, Ruilang Cao, Yufei Zhao, Yaoru Liu

{"title":"Sensitivity investigation of drilling efficiency to operational parameters of a drifter","authors":"Qiang Shen, Yujie Wang, Ruilang Cao, Yufei Zhao, Yaoru Liu","doi":"10.1680/jgeen.23.00190","DOIUrl":"https://doi.org/10.1680/jgeen.23.00190","url":null,"abstract":"Drilling operations are extensively used for underground excavation, and their efficiency has a direct impact on project duration and expenses. Adjusting the operational parameters during the drilling process is important for improving drilling efficiency. In this study, the sensitivity of drilling efficiency to operational parameters was investigated. Full-scale drilling tests for a dolomite block were conducted using a hydraulic drifter, and the Measurement While Drilling system was used to record the drilling data. Orthogonal schemes were designed to arrange the tests, and the penetration rate, specific energy, and rate-energy ratio were regarded as evaluation indices to assess the drilling efficiency. The sensitivity of the evaluation indices to operational parameters was analysed using both range analysis and variance analysis. Results show that the optimal combination of parameters within the test range was determined to be the propelling pressure of 8.5 MPa, percussive pressure of 17.5 MPa, and rotary speed of 250 rev/min to obtain the maximum drilling efficiency. The sensitivity sequence of the rate-energy ratio was propelling pressure, percussive pressure, and rotary speed, with weights of 54.0, 38.7, and 7.3%, respectively. These findings can provide a valuable reference for adjusting the operational parameters of hydraulic drifters to optimise drilling efficiency.","PeriodicalId":54572,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Geotechnical Engineering","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140200002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hyperbolic load-displacement analysis of helical and expanded piles: database approach 螺旋桩和膨胀桩的双曲荷载-位移分析：数据库方法

IF 2.2 4区工程技术

Proceedings of the Institution of Civil Engineers-Geotechnical Engineering Pub Date : 2024-03-21 DOI: 10.1680/jgeen.23.00196

A. Rahimi, A. Eslami, J. S. McCartney

{"title":"Hyperbolic load-displacement analysis of helical and expanded piles: database approach","authors":"A. Rahimi, A. Eslami, J. S. McCartney","doi":"10.1680/jgeen.23.00196","DOIUrl":"https://doi.org/10.1680/jgeen.23.00196","url":null,"abstract":"In recent years, there has been a focus on improving geotechnical systems by implementing and constructing new deep foundation such as helical and expanded piles. This study examined the effects of parameters such as embedment depth, pile geometry, and axial loading direction on the load-displacement behaviour of these piles. To conduct the research, a database was compiled consisting of 80 axial loading test records for different piles. The embedment depth of the piles ranged from 2.4 to 36.8 m, and the diameter of helices or expanded parts ranged from 254 to 1500 mm. The ultimate load of the piles was determined using the 2.5% and 5% displacement ratio criteria and the Brinch-Hansen 80% method. Additionally, hyperbolic functions were fitted to the load-displacement curves, allowing for consistent estimation of the limit load and the initial tangent modulus. Analysis of the results from the database revealed that the dominant factors influencing the ultimate load, limit load, maximum measured load, initial stiffness, and load-displacement behaviour were the ratio of helices or expanded part diameter to shaft diameter, shaft and toe surface area, and load direction. Correlations derived from the database were validated using measurements from eight full-scale helical and expanded piles.","PeriodicalId":54572,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Geotechnical Engineering","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140200355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel methodology for geometry assessment of self-drilling micropiles using distributed fiber optic sensors 利用分布式光纤传感器评估自钻微桩几何尺寸的新方法

IF 2.2 4区工程技术

Proceedings of the Institution of Civil Engineers-Geotechnical Engineering Pub Date : 2024-03-16 DOI: 10.1680/jgeen.23.00113

Alessio Höttges, Carlo Rabaiotti, Raphael Züger, Dominik Hauswirth

{"title":"A novel methodology for geometry assessment of self-drilling micropiles using distributed fiber optic sensors","authors":"Alessio Höttges, Carlo Rabaiotti, Raphael Züger, Dominik Hauswirth","doi":"10.1680/jgeen.23.00113","DOIUrl":"https://doi.org/10.1680/jgeen.23.00113","url":null,"abstract":"Self-drilling micropiles (SDM) are gaining popularity as bearing foundation elements, as this construction technique allows for considerable time and cost savings. However, the irregular geometry and variability in the bearing capacity present uncertainty and a significant risk that has limited SDM deployment. To date, no reliable technology has been used to measure the SDM geometry. This paper proposes a methodology that uses distributed fiber optics (DFO), heat conduction modeling, and inverse analysis to measure the pile geometry and could also be extended to assess its bearing capacity. The temperature distribution during cement hydration was measured using two DFO investigative technologies and was compared to traditional temperature measurements using point sensors. An inverse analysis of SDM geometry was subsequently carried out based on the DFO measurement of temperature a finite element (FE) heat conduction model and a calibration pile. Finally, the calculated pile geometry was compared to the geometry of excavated pile in the uppermost part. The methodology presented here is not only intended as a tool for designing SDMs but can also be deployed as a structural health monitoring system to detect and monitor crack formation.","PeriodicalId":54572,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Geotechnical Engineering","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140205588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Correction effect of jet-grouting on the high-speed railway subgrade lateral deformation on soft soil 喷射灌浆对高速铁路软土路基侧向变形的修正效果

IF 2.2 4区工程技术

Proceedings of the Institution of Civil Engineers-Geotechnical Engineering Pub Date : 2024-02-29 DOI: 10.1680/jgeen.23.00169

Yingqi Bai, Junhua Xiao, Lihua Xue, Zhiyong Liu, Binglong Wang

{"title":"Correction effect of jet-grouting on the high-speed railway subgrade lateral deformation on soft soil","authors":"Yingqi Bai, Junhua Xiao, Lihua Xue, Zhiyong Liu, Binglong Wang","doi":"10.1680/jgeen.23.00169","DOIUrl":"https://doi.org/10.1680/jgeen.23.00169","url":null,"abstract":"Viable remediation of the large lateral deformation of high-speed railway (HSR) subgrades, especially in soft soil areas, is still absent. An integrated rectification scheme of high-pressure jet-grouting (HPJG) combined with stress-release techniques was conducted to rectify the large lateral deformation of an operational HSR subgrade in the soft soil area of China, but without the refined design and mechanical analysis before rectification due to the emergency. The objective of the study is to post-evaluate the rectification effects utilizing field monitoring data and numerical calculations. The monitoring data showed that the maximum lateral deviation of the subgrade was 69.1 mm, which almost met the expected correction requirements. However, the influence of the excess pore water pressure (EPWP) dissipation on the correction deviation was not considered in the scheme. Therefore, a numerical model was established to further investigate this effect and corresponding mitigation methods. The calculated results revealed that EPWP in the foundation dissipated mostly within six months after rectification, and the deformation loss accounted for 30.7% of the total deviation. Prolonging the interval of two-row pile construction can be a plausible approach to mitigate the deviation loss. The findings provide a feasible method for correcting large lateral deformation of HSR subgrades.","PeriodicalId":54572,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Geotechnical Engineering","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140200004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preliminary study on tensile performance of 3D-printed geogrids- effects of various geometrical configurations 三维打印土工格栅拉伸性能初步研究--各种几何结构的影响

IF 2.2 4区工程技术

Proceedings of the Institution of Civil Engineers-Geotechnical Engineering Pub Date : 2024-02-29 DOI: 10.1680/jgeen.23.00068

Milad Shirdel, Masood Farzam

{"title":"Preliminary study on tensile performance of 3D-printed geogrids- effects of various geometrical configurations","authors":"Milad Shirdel, Masood Farzam","doi":"10.1680/jgeen.23.00068","DOIUrl":"https://doi.org/10.1680/jgeen.23.00068","url":null,"abstract":"This study aims to evaluate the tensile performance of additively manufactured polyethylene terephthalate glycol (PETG) geogrids 3d printed using the material extrusion technique. The ‘Creality Ender-3 V-2‘ 3D printer was employed for this purpose. Subsequently, specimens were subjected to loading at a rate of 1 mm/min until failure occurred. The geometrical parameters investigated in this study included: (1) shape of the aperture (square, triangular, hexagonal), (2) aperture size, (3) rib thickness, and (4) type of junction. The results revealed that the failure of specimens was primarily brittle and independent of any specific geometrical configuration or modifications. The initiation of failure consistently originated from the junctions. Among specimens with typical junctions, the triaxial geogrids exhibited the highest tensile capacity, while among geogrids with modified junctions, the square geogrids performed the best. Additionally, the load capacity of geogrids was primarily governed by linear behaviour in terms of rib width, regardless of aperture size or shape whereas nonlinear regression model characterized the load-displacement curves. Finally, it is important to account for geometrical nonlinearity in specimens with hexagonal apertures.","PeriodicalId":54572,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Geotechnical Engineering","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140200003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Practical use of shear wave velocity measurements in UK clays (BGA Touring Lecture 2023) 英国粘土中剪切波速度测量的实际应用（BGA 巡回讲座 2023）

IF 2.2 4区工程技术

Proceedings of the Institution of Civil Engineers-Geotechnical Engineering Pub Date : 2023-12-15 DOI: 10.1680/jgeen.23.00158

Michael Long

{"title":"Practical use of shear wave velocity measurements in UK clays (BGA Touring Lecture 2023)","authors":"Michael Long","doi":"10.1680/jgeen.23.00158","DOIUrl":"https://doi.org/10.1680/jgeen.23.00158","url":null,"abstract":"This paper seeks to promotes use of shear wave velocity (Vs) measurements in UK clays as a complement to more standard ground investigation techniques. Vs measurements seem repeatable and independent of the method of measurement used in isotropic soil conditions, e.g. soft clays. However in glacial tills, and especially in the overconsolidated clays of south-east UK, Vs measurements will differ depending on the direction of propagation and polarisation of the shear waves due to natural stress anisotropy and the fissured nature of the materials. Correlations between Vs and other in situ data and with a variety of soil properties can be very powerful and some have been proposed here for UK clays. However these correlations should ideally be local and only applied to other soils and areas with great caution. Other uses of the techniques, beyond those of classical dynamic analyses, have been described together with some future challenges. Uncertainties in the methods have been well researched and several methods have been proposed to deal with these uncertainties. Nonetheless advice from a geophysical colleague will enhance the geotechnical engineers’ use of Vs data.","PeriodicalId":54572,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Geotechnical Engineering","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138688185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamic behavior of new anchor cable ribbed rockfall retaining walls on rock shed: rockfall impact 新型锚索肋落石挡土墙在岩棚上的动力特性:落石冲击

IF 2.2 4区工程技术

Proceedings of the Institution of Civil Engineers-Geotechnical Engineering Pub Date : 2023-11-20 DOI: 10.1680/jgeen.23.00084

Qi Liu, Xianfeng Liu, Jianguo Li, Shengyang Yuan, Peng He, A. Giacomini, O. Buzzi

{"title":"Dynamic behavior of new anchor cable ribbed rockfall retaining walls on rock shed: rockfall impact","authors":"Qi Liu, Xianfeng Liu, Jianguo Li, Shengyang Yuan, Peng He, A. Giacomini, O. Buzzi","doi":"10.1680/jgeen.23.00084","DOIUrl":"https://doi.org/10.1680/jgeen.23.00084","url":null,"abstract":"This study investigates the dynamic behavior between a rockfall and a new anchor cable ribbed rockfall retaining walls on a rock shed, which is designed to meet project requirements due to the tremendous space occupation of the protection structure, via numerical simulations by the coupling between PFC3D (discrete element method, DEM) and FLAC3D (finite element method, FEM). In the model, the slope model was imported after the point cloud of the slope was processed. The novel structure is modeled by the finite element method (FEM) through the zone element, while the rockfall and the buffer layer are modeled by the discrete element method (DEM) through the ball element. The dynamic movement of rockfall was traced, and the impact position and velocity were obtained on the structure. The numerical results show that three stages of the rockfall movement were modeled, namely, movement, impact, and stagnation. The rockfall falls on the slope, impacting the buffer layer on the top of the rock shed, before rebounding to the anchored rockfall retaining walls (with a height lower than 2 m). Then, the stress and deflection can be unified and related to the impact velocity of rockfall to examine the stability of the structure. In addition, the rockfall radius is the dominant parameter in the three parameters (rockfall shape, rockfall radius, and impact velocity). While the study focuses on a specific case study, the results provide valuable guidelines for future applications of the proposed combined structure for railway transportation protection.","PeriodicalId":54572,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Geotechnical Engineering","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138495401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0