bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on characteristics and calculation method of VSC-HVDCshort circuit current under three-phase AC short circuit
Authors: Huo Qidi , Su Qingmei , Tang Xiaojun , Lu Yingquan , Huang Ting , Li Kewen , Huang Daoshan 
Published: March 2020

Abstract
VSC-HVDC has been widely used at home and abroad, but there is no clear conclusion about the characteristics and calculation method of the short-circuit current contributed by VSC-HVDC during the AC Short-Circuit Fault near the converter station. The calculation methods in the field of short-circuit current engineering have not been unified, and the adaptability and error of different methods have not been analyzed in detail. Through electromagnetic transient simulation, this paper analyzes the transient characteristics of VSC-HVDC contribution short-circuit current, and combs the key influencing factors of VSC-HVDC contribution short-circuit current. Finally, taking a VSC-HVDC system in China as an example, the adaptability of the commonly used short-circuit current algorithm is analyzed. It is verified that the existing engineering algorithms have made great progress compared with the original. However, compared with the electromagnetic transient refined simulation, there is still a large error in the calculation results of individual nodes under some control modes / fixed values.
Research and application of non-invasive intelligent power system
Authors: Feng Liu , Li Xiaolan , Jin Guanghua , Ji Guang , Fang Delong , Xu Xianglei 
Published: March 2020

Abstract
Most of the traditional intelligent power systems collect data information through sensors installed on the user’s equipment side, and then conduct intelligent operation, resulting in poor user experience. With the increase of all kinds of electrical equipment, the number of sensors to be installed is also increasing, resulting in waste of resources. It is an important direction of customer side service upgrading to build ubiquitous power Internet of things and explore a new type of intelligent power consumption mode that is customer-centric and market-oriented. Based on the requirements of the current Ubiquitous Power Internet of Things, this paper proposes a new mode of intelligent power system based on non-invasive load monitoring and identification technology. This new mode realizes diversified value-added services for power consumption, also, this mode is applied to the customization of user’s personalized business, precise management and control of power equipment, so as to enhance the user’s power consumption experience and build a market-oriented customer side business application has important application value.
Analysis of Load Characteristics Changes in the Case of Large-scale Electric Energy Substitution Load Connected-in
Authors: Li Zhuonan , Liu Jun , Jin Yanming 
Published: March 2020

Abstract
Global energy development trends and resource endowments determine that clean substitution and electric energy substitution will be important directions for the sustainable development of world energy. Electricity has the advantages of cleanness, safety, and convenience. The implementation of electric energy substitution is of great significance to promote the energy consumption revolution, implement the national energy strategy, and promote clean energy development. At present, many provincial and municipal governments are committed to promoting electrical energy substitution to complete the energy revolution on the consumer side, which has put the local power system to the test. In this paper, a load characteristic change model based on artificial bee colony algorithm for large-scale access of electric energy substitution load is established. In addition, the power load in a typical area is used as an example, and its load change is also calculated.
Framework for exploratory modeling of power system evolution
Authors: Wu Shengyu , Jiao Bingqi , Wang Shuhui 
Published: March 2020

Abstract
One of the challenges power system evolution research facing is deep uncertainties, which could not be described by Knightian uncertainty. This paper reviews three types of research methods involving power system evolutionary research, one is power system planning modeling, the other is complex network theory, and the third is exploratory modeling, of which exploratory modeling could handle with deep uncertainties. This paper combines the first and the third method, and proposes an exploratory modeling framework of power system evolution, which embeds the power planning model as the core to reflect the operating characteristics of the power system in the framework.
Development and Application of Lightweight Coring Drilling Rig in Tunnel
Authors: Fan Dong , Tian Hongliang , Wang Ruize 
Published: March 2020

Abstract
This paper introduces ZDY1200G lightweight underground drilling rig. The feeding device was designed with light alloy material and the deformation of the fuselage was measured by 3D DIC speckle deformation measurement. A high-speed gyrator with large through hole for hard rock coring was designed. A hydraulic system based on constant pressure variable displacement pump was developed, which included feed linkage and rotary linkage. The drilling rig has been applied in the Cangyuan lead-zinc mine in Yunnan Province. A rope coring drilling hole with 512.68 m depth and 76 mm diameter has been completed. The reliability and technological advancement of the whole set of equipment have been verified, which provided technical support for the exploration of the Cangyuan lead-zinc mine and also mining areas with similar conditions.
Research on Convergence of Artificial bee colony algorithm based on crossover and consistency distribution–good point set
Authors: Zhang Pinghua 
Published: March 2020

Abstract
A new artificial bee colony (ABC) algorithm based on crossover and consistency distribution–good point set is proposed. In the iterative search process, we use the consistency distribution and good point set principle of number theory to establish the initialization model of the algorithm, thereby ensuring the uniform distribution of the population in the search space. The location is updated iteratively to maintain the diversity of the population and prevent the algorithm from falling into the local optimum. Finally, the method that the artificial bee colony algorithm improved by consistency distribution-good point sets is proven and it conforms to Markov process from the point of view of number theory, thus proving the convergence of the algorithm.
Experimental study on permeability and expansion characte-ristics of expansive soil
Authors: Peng Kai , Li Xiaogang , Yang Ronghao , Liu Chong , He Hao 
Published: March 2020

Abstract
Expansive soil is used as a high-plastic clay, the bearing capacity is gradually attenuated due to the penetration of water, which greatly limits the application range of practical engineering. In this paper, the permeability and expansibility test of remolded soil and undisturbed soil in expansive soil were carried out. Ability coefficient of remolded soil and undisturbed soil under different overburden values was compared and analyzed. Overburden load, head height and water content were studied. The effect of the rate on the permeability coefficient of remolded soil and further analysis of the expansion and expansion forces at different initial moisture contents The results show that the permeability coefficient of remolded soil and undisturbed soil decreases with the increase of overlying load. As the water content increases, the permeability coefficient decreases first within a certain range. After reaching a certain level, the permeability coefficient gradually increases. As the initial water content increases, the amount of expansion progressive decreases and the expansion force progressive decreases.
Analysis on seismic behavior of different structural systems of small high-rise buildings
Authors: Luo Ruofan , Feng Zhuojun , Ouyang Zhiyong , Liu Yimei 
Published: March 2020

Abstract
In order to study the seismic performance of small high-rise building under different structural systems, an ordinary residential tower building of 11 floors in 7 degree area was designed as a frame structure, frame-shear wall structure and shear wall structure respectively. Elastic calculation of all structures was conducted based on FE model built by the software of YJK and elasto-plastic time-history analyses were conducted by the software of PERFORM-3D. The numerical results confirm that all of the three kinds of structure system can meet the requirement that the beam yield firstly, but vertical force component dose not yield in rare earthquake. On the frame-shear wall structure, the inter-story drift angle can be controlled better. The proportion of plastic energy dissipation of the frame structure is the highest and of the shear wall structure is the least among the three structures. All kinds of structure systems show good seismic behavior.
Rapid co-extraction of coal and coalbed methane techniques: a case study in Zhangji coal mine, China
Authors: Tang Bin , Tang Yongzhi , Wang Chuanbin , Li Yanqing , Yu Yan , Dai Mai , Wang Zhenhua 
Published: March 2020

Abstract
Coalbed methane (CBM) is one of elements of coal mine hazards, the high CBM content and low permeability coefficients of coal seams in Huainan coal filed result in high difficulty of coal exploitation and CBM drainage, and the potential risk of gas explosion and combustion. The CBM drainage works are time-consuming and they typically delay the coal mining operations. A set of novel techniques of rapid co-extraction of coal and CBM are proposed in this paper. In the practice of 1413A longwall panel of Zhangji coal mine, a set of overlying and underlying drainage galleries were replaced by two overlying drainage galleries which were excavated by TBM, thereby the stress of excavation works was reduced. The pre-drainage and roadway excavation are conducted simultaneously and the overlying drainage gallery can also be used for post-drainage purposes. The bolter miners and automatic or remote control of longwall mining have also been used in the practice. The 1413A longwall extracted 2.31 million tons of coal and 15.02 m3 of CBM with the extraction rates of 93.5% and 63.8% respectively in 448 days. The speed and efficiency of co-extraction operations were improved significantly.
Research on gas leakage mechanism and detection technology of coal mine gas drainage
Authors: Ba Quanbin 
Published: March 2020

Abstract
Aiming at the low concentration of gas in the percolation borehole, the paper analyzes the mechanism of gas leakage in the sealing hole of the pumping hole based on the multi-physics coupling theory based on the distribution of the surrounding rock stress field of the mining borehole and the roadway. The drilling hole sealing detection device and the determination method are used to detect gas concentration at different depths in the borehole in the normal extraction state, and analyze the variation law of the gas drainage concentration along the hole depth distribution to achieve fast and accurate judgment of the leak position and sealing test of the pumping hole. The test proves that the method and the device can effectively detect the leaking position and sealing effect of the extraction drilling hole, and can provide a simple and rapid detection method and science for the improvement of the sealing process, the adjustment of the sealing depth and the fine management of the coal mine site.
Study on the law of artificial crack propagation and fracturing technology in strong heterogeneous conglomerate strata: a case study of the Mahu glutenite in Xinjiang Oilfield
Authors: Duan Guifu , Tian Gang , Guo Dingfei , Zhang Jingchen , He Chunming , Yu Huiyong , Chen Jin 
Published: March 2020

Abstract
The glutenite reservoir of the Triassic Baikouquan Formation in the Mahu sag with a large amount of resources, is the main block for Xinjiang oilfields and even domestic oil production in recent years. The reservoir is characterized by deeper burial, fewer natural cracks, low fluidity, high pressure coefficient, high horizontal stress difference and special lithology. For these geological problems, researches on fracture extension law, proppant placement law and fracturing technology have been developed to form an integrated volume fracturing technology of heterogeneous glutenite geological engineering. The contributions are as follows:(1) The lithofacies reservoir in Mahu includes matrix support, particle support and mixed support, which makes the conglomerate reservoir have large differences in many respects. The mechanical parameters of granular-supported conglomerate are higher than those of complex-base-supported conglomerate, and the brittleness index is higher.(2) Fracture regularity of glutenite varies greatly at different scales. As the ratio of fracture size to gravel size enlarges gradually, the influence of gravel on fracture extension weakens.(3) The fracture roughness of glutenite has great influence on fluid flow and proppant migration. The sand-laden fluid flows by fingering in small fracture. The crack with larger width is the dominant flow channel and will influence proppant placement.
Establishment and Application of Sand Prediction Model Based on Monte Carlo Method in Offshore Oil-gas Field
Authors: He Hanping , Guo Fang , Liu Liming , Li Menggang , Wang Xin 
Published: March 2020

Abstract
Accurate assessment of reservoir sanding risk is a key link in the optimization design of offshore oil-gas fields. Based on the Monte Carlo risk probability assessment method, three factors affecting sand production, such as rock Poisson’s ratio, rock density and acoustic time difference, are considered. At the same time, combined with the existing sand production index prediction theory, the probability distribution calculation model of sand risk is established and analyzed. The established prediction model is used to analyze the sand production case. The model was combined with the logging data and seismic data of some layers in Oilfield HZ 32-5 to form the probability distribution map of the sand production index of the J22, J50 and K08 horizons in HZ 32-5 Oilfield. The probability of different sand production levels of the three reservoir rock horizons is predicted, and the corresponding sand control risk prevention and control plan is formulated. Through the on-site application of HZ 32-5 Oilfield, it is proved that the model can more accurately assess the sand production risk in offshore oilfields, and has a good guiding significance for the design of oil-gas well completion schemes.
Research on Support Type Selection of Foundation Pit of Rail Transit Station Based on Improved AHP Method
Authors: Liu Yan , Lu Linhai , Liu Junyan , Zhao Jianjun 
Published: March 2020

Abstract
With the rapid development of underground space, a large number of complex foundation pit projects have emerged. It is undoubtedly an important task to select a safe, economic, scientific and reasonable support scheme and seek a scientific and reasonable optimization method of foundation pit support scheme in combination with regional characteristics. This paper tries to find a simple and practical method of scheme selection which meets people’s psychological comparison scale. The traditional analytic hierarchy process (AHP) is improved, the grade of traditional evaluation index is improved, and the index scale is introduced. An analytic hierarchy process based on the seven grade index scale is put forward to make it more suitable for people’s psychological comparison scale. Through consistency test, the scientificity and rationality of the improved layer analysis method are verified, and applied to the foundation pit engineering with close proximity to rail transit. Through the establishment of the tomographic structure model and judgment matrix, the calculation and optimization are carried out. It is found that the support scheme of diaphragm wall + internal support is the optimal scheme of the project. This method can provide theoretical support for the establishment of regional foundation pit support selection.
Study on stress distribution under pillar floor of room in Potash mine with room and pillarmining technology
Authors: Chen Mingcheng 
Published: March 2020

Abstract
Room and pillar mining is a traditional mining method in the world. Carnallite/potash salt is easy to absorb water and has a strong cohesive force, its physical and mechanical properties are completely different from those of coal. The span of the room and pillar in the potash mine is small, generally ranging from 8 to 15m. Taking a solid potash mine in Laos as engineering background, basing on the elastic semi-infinite space theory, this paper sets up the mechanical model of room and pillar mining, adopts Flamant and Boussinesq solution under linear load to make research on the additional stress caused by mining in the transmission, distribution and impact depth of floor. The results indicate that depth 6 m under pillar bottom, the σz at various points is around 0.1 p. If 0.1p is used as the judgment basis for the critical impact depth of additional stress, it can be considered that the impact depth of stress concentration on bottom plate caused by mining is about 6b.
Study on the Performance of Foundation Pit Supporting System Considering the Process of Anchor Recycling
Authors: Zheng Quanming , Liu Yan , He Donglin , Zhang Xiwen 
Published: March 2020

Abstract
The technology of recoverable anchors / cable greatly avoids the disadvantage of traditional anchors / cable, such as non-recyclable, waste of resources and occupy underground space. However, there are many problems existed in the development, design and application processes. Taking a foundation pit project in the city of Jinan as an example, the numerical analysis of the whole construction processes was conducted to study the mechanical behaviour of supporting systems. It is found that the supporting pile has major deformation during the excavation and anchors recycle. For the process of anchor recycle, the bending form of supporting pile transformed from outward to inward. Moreover, the horizontal displacement of pile top increased by 21.4%. The axial force of upper anchor increased during the recycle of lower anchor, for example, the axial force of uppermost anchor increased by 21.3% comparing to the state that no anchor was recycled. Therefore, for the real project of anchor recycling, the internal force redistribution and deformation property of supporting system should be fully considered, to avoid the influence to the surrounding buildings and the foundation pit itself.
Analysis of the Influence of Boundary Conditions on the Mechanical Characteristics of Arch Bridge with Composite Arch
Authors: Li Changchang , Wu Ling-Ling , Chai Shengbo , Zhao Yu , Zhou Yong-Jun 
Published: March 2020

Abstract
Mid-through arch bridge with a composite arch rib of the main arch and vice-arch is novel and reliable in rigidity. It belongs to the high-order statically indeterminate structures, and the boundary form has a great influence on the internal force and deflection of the structure. In this paper, in order to study the influence of different boundary conditions on the static and dynamic characteristics of the structure, relying on a practical project, the static and dynamic characteristics of the bridge under different boundary conditions of the main arch foot are analyzed and compared by using finite element method, which provides scientific basis for the design of the arch bridge with composite arch. The results show that the boundary conditions of the main arch foot have obvious effects on the deflection and internal force of the arch under dead and moving loads, but have little effect on the dynamic characteristics and stability of the bridge.
Girder Lattice Model and Single Beam Model In Load Test of Continuous Box Bridge Computational Comparison and Analysis
Authors: Gui Peng , Su Shengjiang , Peng Cheng , Qi Wei 
Published: March 2020

Abstract
The static load test of a three-span continuous box girder in Huzhou City, Zhejiang Province is analyzed and calculated by using the grillage method and the single main girder method. The rationality of the two calculation models is compared with the field load test data. The calculation results show that the results of grillage method are more consistent with the experimental results than that of single girder method, and the safety of the calculation results is higher. Therefore, in the load test of multi-compartment box girder bridge, the grillage method is more reasonable and can better reflect the mechanical characteristics of the bridge structure.
Science mapping approach to assisting the review of mine water disaster prediction and evaluation in China between 2009 and 2019
Authors: Liu Beizhan , Feng Rao , Liu Anqiang , Dong Lihong 
Published: March 2020

Abstract
Mine water inrush occurs frequently in China, and it can cause serious economic losses and heavy casualties. Thus, it is very important to realize risk assessment of mine water inrush. After collecting 4082 journal documents on risk assessment of mine water inrush from 2009 to 2019 in CNKI journal database, and using CiteSpace visualization software to do data analysis, the research hotspot and frontier trend in mine water inrush research in China are obtai ned. The prevention and prediction of different types of water disasters is a major trend in this field.
Construction and Application of Groundwater Environmental Health Assessment Model Based on Entropy Weight and Fuzzy Matter Element
Authors: Wang Feng , Xu Zhenghe , Pan Weiyan , Zhang Shanshan 
Published: March 2020

Abstract
Groundwater overdraft has become a major challenge, most serious in northwestern and northern China. A series of environmental geological problems caused by groundwater overdraft will be more extreme, which restrict the development of society. In this study, matter-element theory is introduced. Moreover, a matter-element evaluation model is established, and a matter-element evaluation algorithm based on fuzzy entropy weight is proposed. The algorithm takes nature, environment, economy and society as the characteristic indexes of the evaluation category. Four kinds of typical regions were chosen including Core Economic Zone (A), Bearing Industry and Trade Economic Zone (B), Agricultural Machinery and Trade Economic Zone (C) and Ecological Agricultural Economic Zone (D) as the study region. The risk assessment of groundwater is evaluated using the groundwater environmental health assessment model in this study. The results showed that the constructed model can be used for the assessment of environment health of groundwater successfully. The simulation results showed that the groundwater was in a medium health state in Linqing City. The results showed that groundwater environment of ‘healthy’ state of nearness concentrated between 0.2 and 0.4. The descending order for typical regions groundwater environment ‘healthy’ state of nearness from high to low are B, D, A, and C.
Adptive Multi-scale Finite Element Considering Local Buckling of Members for Latticed Frames
Authors: Liu Haifeng , Wang Changzhi , Hu Xiaoguang 
Published: March 2020

Abstract
To consider the local buckling of the members in the reticulated frames, based on the multi-scale simulation, the part of member that having local buckling is divided by the shell elements as a micro-model, and the other part of the member was simulated by beam elements as a macro-model. The incremental displacement constraint equations for the nodes on the section between the two models are established based on the plane section premise of classical beam theory. A method to introduce the constraint equations is derived based on the Updated Largrangian method. The location of the micro-model is predicted by the deflection function of the beam, and the length of the collapsed part is estimated. Its accuracy proves to be satisfied by the pure shell element model.