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Administrated by The Education Department of Jilin Province
Sponsored by Jilin Jianzhu University
Editor-in-Chief: CHEN Lei
Edited and Published by Editorial Department of Journal of
Jilin Jianzhu University
Address: 5088 Xincheng Street, Changchun, China
Postcode: 130118
ISSN 2095-8919
CN 22-1413/TU
Tel: +86-431-84566046
E-mail: jljzdxxb@jlju.edu.cn
Website: https//jljz.cbpt.cnki.net/portal
Research on the effect of bearing platform thickness on compressive bearing performance of new CEP monopile foundation
XIE Yubo;QIAN Yongmei;JIA Baichen;LIU Zunpeng;JIN Yujie;ANSYS software is used to analyse the compressive bearing performance of the new concrete expanded-plate piles(hereinafter referred to as the new CEP pile) monopile foundation, focusing on the influence of the change of bearing platform thickness on the bearing performance. By modeling five groups of new CEP piles with different bearing platform thicknesses and one group of new CEP piles without bearing platform, and comparing and analysing the displacement maps and nodal stresses, the following conclusions are drawn: the bearing capacity of monopile foundation of new CEP piles is much higher than that of CEP piles without bearing platform, and the increase of bearing platform thickness will improve the bearing capacity of monopile foundation; however, there is a certain limitation to the increase of the bearing platform thickness,or else the growth of the bearing capacity will be insignificant and the concrete will be wasted. Therefore,reasonable selection of bearing platform thickness is crucial for the new CEP pile foundation design. The conclusion of this paper provides a theoretical basis for the engineering design and popularisation of new CEP piles.
Inversion of grassland soil moisture based on backscattering coupling model and Gaofen data
WENG Haozhe;CHEN Si;GUO Junda;WANG Rongbin;SUN Chen;ZHENG Xingming;Soil moisture is the most direct environmental index to evaluate surface drought. Taken the coastal area of Wenchang City, Hainan Province as the research area, and the coupled model of radar backscattering is constructed, and the soil moisture inversion algorithm suitable for seawater intrusion area is developed.Combined with water cloud model and bare soil backscattering model, a coupled backscattering model was constructed, and four vegetation indices were selected to construct a vegetation water content estimation model. In the experiment, 50% of the measured data on the ground were randomly selected, and the coupled backscattering model was parameterized with the high-resolution GF-3 satellite data. The backscattering coefficient was simulated with the remaining 50% of the measured data, and the cost function was constructed with the backscattering coefficient extracted by the satellite. The cooperative inversion of soil moisture and surface roughness was realized by the least square method. The results indicated that the inversion accuracies for soil moisture and surface roughness achieved R values of 0.470 and 0.562, RMSE values of 0.022 cm~3/cm~3 and 0.071 cm, and Bias values of-0.001 cm~3/cm~3 and-0.003 cm, respectively. This study provides valuable insights for the inversion of soil moisture and surface roughness, particularly in coastal regions characterized by large diurnal temperature variations and high wind speeds.
Analysis on the upper bound of active earth pressure considering the support and retaining structures with inclined strata on the back of wall
ZHANG Chao;ZHANG Jingwu;LI Mingdong;LI Yanxiang;YI Jinxiang;Rigid retaining wall is a standard support structure in geotechnical engineering. The effectiveness of their design hinges on accurately calculating the soil pressure exerted against the wall. To address the issue of active earth pressure on retaining structures with an inclined stratum behind the wall, we developed a theoretical approach based on the upper bound theory of limit analysis. This approach constructs the damage mechanism of the inclined stratum and establishes a formula for calculating the active earth pressure coefficient. We compared our results with Coulomb's earth pressure calculations and the results of exisling literature to validate our method.Additionally, we explored how different inclination angles at the soil interface affect the results. Furthermore, the study examines how the angle of internal friction of the fill, the joint force coefficient, the layer height ratio, and the height of the retaining wall impact the active earth pressure coefficient. This analysis is conducted for retaining structures with an inclined stratum at the back, considering varying inclinations of the stratum interface.
The effect of hybrid steel fibers on the mechanical properties of reactive powder concrete
TIAN Wei;YANG Hongtao;Steel fibers, known for their strong tensile properties and excellent bonding ability with concrete, lead to a rapid increase in concrete costs as the volume fraction of steel fibers in reactive powder concrete(RPC) increases. However, the rate of improvement in strength, toughness, and other properties gradually decreases. By fixing the volume fraction of steel fibers and altering the types and hybrid ratios of steel fibers, 22 sets of RPC specimens under standard curing conditions were designed and fabricated.Experimental analyses were conducted on mechanical indicators such as compressive strength, axial compressive strength, splitting tensile strength, flexural strength, and bending toughness. The research aimed to investigate the impact of various fiber lengths, fiber shapes, and hybrid ratios on the mechanical properties of RPC, and to identify an optimal hybrid scheme for steel fibers. The results show that with a 3%steel fiber volume fraction, the mechanical properties of RPC are optimal when the mixing ratio of 13 mm hooked-end steel fibers to 20mm hooked-end steel fibers is 1:3. Compared to RPC specimens using only 13 mm straight steel fibers, RPC with this mixing ratio exhibits a 24.78% increase in compressive strength, a 61.43%increase in splitting tensile strength, a 236.43% increase in flexural strength, and a 283.64% increase in bending toughness(I10). This confirms the feasibility of utilizing hybridized heterogeneous steel fibers to enhance the mechanical properties of RPC.
Experimental research on the performance of mobile soil engineering with improved slag soil
ZENG Changnv;SUN Jiangteng;CAO Shuoqian;REN Lei;HUANG Chunhui;The improvement of our excavation waste soil is particularly important for resource recycling and greening. Self compacting flowable soils can be an ideal target for shield spoil improvement. It is aimed at improving the treatment of excavation waste sludge produced by shield structure in Zhengzhou area. The material was made of slag soil, cement, rosin-type plant foamer and activated magnesium oxide. Where the active magnesium oxide and foamer both mixed and blended to collaboratively improved the slag soil, achieved significant improvements. Fluidized backfill with satisfactory fluidity and bleeding rate was prepared by adjusting the content of foam and magnesium oxide. The stress-strain relationship and the variation of nephogram deformation were analyzed by image triaxial test. It was shown that at 3% and 5% foam dosing and 3% active magnesium oxide dosing, it was optimal for improving the flowability and mechanical properties of the mix. Test preparation of mobility of 200～320 mm, the overall water secretion rate does not exceed 5%, 28 d compressive strength in the range of 0.3～0.75 MPa flow engineering soil. This provides a rational basis for the rational allocation of excavated waste spoils, as well as the effective utilization of resources.
Research on Cloud Computing Based on Virtualization Technology
LI Gang-jian(School of Computer science and Engineering Jilin Institute of Architectural and Civil Engineering,Jilin,Changchun,China 130118)In the paper,the author did research on the current trend of cloud computing technology and the cloud computing model.According to its own characteristics,a way is presented based on Hyper-v.The platform has some advantages,so that the characteristics of virtualization will come into perform well.
The Development Status and Prospects of Diatomite
XIAO Li-guang,ZHAO Zhuang,YU Wan-zeng(School of Material Science and Engineering,Jilin Institute of Architecture and Civil Engineering,Changchun,China 130021)Diatomaceous earth as a very abundant mineral resources,as its porosity,adsorption is strong,light,high melting point,thermal insulation,sound absorption,low refractive index,chemical stability and so on,it has a widely used in many fields.This paper describes the latest research and application of diatomite in fillers,filter aid,agriculture,construction materials and other areas.
Iron Tailings Comprehensive Utilization at Home and Abroad
XIAO Li-guang,YI Jing-hong,CUI Zheng-xu(School of Material Science and Engineering,Jilin Institute of Architecture and Civil Engineering,Changchun,China 130118)The mineral resource is one of the human survival and development important material bases,along with mineral resource's massive developments and the use,the ore is day by day deficient,the tailings recycling has a second world attention.This article describes the tailings and the comprehensive use of the status quo,the application of the building materials,and the proposal in the future development of tailings.
Development of the Sludge Treatment Techniques
Wang Shiyuan (The Countryside Hygiene and Reform Water Office of Jilin Province)Cui Yubo, Wang Cuilan, Jian Zhiyuan (Department of Urban Construction)This paper simply introduced the sludge treatment techniques and its development, and presented the regulation of choosing and developing sludge treatment techniques.
Summary of Data Mining Methods
GUO Xiu-juan (Department of Computer Engineering,Jilin Architectural and Civil Engineering Institute,Changchun130021)The good methods and technologies of data mining may get excellent knowledge.This paper presents an overview on data mining methods.First,the concept of data mining is discussed.Then,this paper describes the theories and technologies on data mining,such as relational rules,decision tree,neural network,rough sets,clustering analysis,genetic algorithms,and statistics analysis.Finally,how to study data mining is forecasted.
Research Progress in Synthesis and Application of Quantum Dots
LI Hua-nan;FENG Wei;WANG Ting;Polyimide had many advantages,such as heat resistance,low temperature resistance,resistance to radiation,flame retardant,non-toxic characteristics,excellent mechanical properties,dimension stability,chemical stability and biocompatibility etc,had been widely used in aviation,aerospace,electrical,electronics,communications,buildings,cars,and other areas of the tip. In this paper,a review was given about the basic classification and main characteristics of polyimide as the core. It was summarized the polyimide synthesis method and modification of significance. Moreover,suggestions were expounded about the application progress of polyimide in many fields,and prospect the development trend of the future.
The Comparison of the French Versailles Palace and China Beijing Imperial Palace
YU Qi,MO Wei (School of Architecture and Planning,Jilin Institute of Architecture and Civil Engineering,Changchun,China 130118)By comparing space layout,building systems,construction materials and structural,architectural decoration and color of different points for the French Versailles palace and the Beijing national palace museum in China,from macroscopical to microcosmic comparison of the two countries palace architecture,cultural of the similarities and differences between China and France is analyzed.Trying to find out the difference between eastern and western culture as the history of eastern and western architectural palaces outstanding representative of China's Beijing palace museum and the French Versailles palace,has long been regarded as the world two great cultural windows.Different cultures on the "beauty" of the pursuit are not the same.Therefore,we compared from an aesthetic point of view these two in the history of human civilization occupy a considerable proportion of the palace construction.To arouse people on architectural aesthetics thinking and a new understanding are done.
Black Humor in George Orwell’s Animal Farm
ZHAO Yu-hong(School of Foreign Language,Jilin Institute of Architecture and Civil Engineering,Changchun,China 130021)Black humor skill is applied by George Orwell in his masterpiece Animal Farm to represent an inhumane society.The skill of irony,the implication of the characters,and fallacy will be analyzed in this article.
The Development Status and Prospects of Diatomite
XIAO Li-guang,ZHAO Zhuang,YU Wan-zeng(School of Material Science and Engineering,Jilin Institute of Architecture and Civil Engineering,Changchun,China 130021)Diatomaceous earth as a very abundant mineral resources,as its porosity,adsorption is strong,light,high melting point,thermal insulation,sound absorption,low refractive index,chemical stability and so on,it has a widely used in many fields.This paper describes the latest research and application of diatomite in fillers,filter aid,agriculture,construction materials and other areas.
The Cause of Global Warming
WANG Hong-jie,SONG Xiao-dong,WANG En-shi(Jilin Institute of Architecture and Civil Engineering ,Changchun ,China 130021;In the early 1930s ,the distinguished Yugoslavian climatologist Milankovich had already developed the theory that a tiny ? uctuation in the eccentricity ratio of Earth's orbit ,or the obliquity of Earth's spin axis ,even in the position of the first point of Aries may render a direct in? uence on the solar radiation's range and degree;therefore ,causes the climate change on Earth .Based on a comprehensive calculation ,the authors came to the conclusion that besides the robust increase of greenhouse gases(CO2 ,CH4 ,etc .) , there are also other factors that cause global warming , but this paper focuses on the angular change between Earth's axis and its ecliptic plane .According to the paper ,both the internal variables(earthquake ,wind ,tide ,rocket's launching ,etc .) and the external variables(the sun's motion , other planets' motion ,meteoric stone ,etc .) impacted greatly on this angle .What's more ,no matter to what degree this angular change arrives at ,it inevitably causes the climate change on Earth throughout the time .
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