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For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Analysis of Mechanical Properties of Cast-in-Place Prestressed Concrete Curved Box Girder WANG Jianxing, WANG Xinjie Journal of Jishou University(Natural Sciences Edition)    2023, 44 (4): 39-46.   DOI: 10.13438/j.cnki.jdzk.2023.04.005 Abstract （256）      PDF（pc） （2747KB）（132）       Knowledge map    Save To analyse the mechanical properties of cast-in-place prestressed concrete curvilinear box girder under load,this paper took the actual project as the background,with the establishment of finite element model of curvilinear box girders,analyzed the mechanical characteristics and deformation law of the structure under different loads,and summarized the corresponding characteristics.Through the finite element analysis of the cast-in-place prestressed concrete curved box girder,the results show that there is a big difference between the arc lengths of the inner and outer sides of curved box girder,and the stress of the inner and outer sides of the same section of box girder is different;the stress produced when the same load is applied to the outer side is greater than that produced when it is applied to the inner side;under the vertical normal load of curved box girder,the longitudinal stress of mid-span section is less than that of side-span section;the vertical bending of the bridge is accompanied by the transverse torque,but the vertical bending value is far greater than the transverse torque value. Reference | Related Articles | Metrics | Comments（0） Select Stability of Three-Dimensional Cracked Slopes Reinforced by Anti-Slip Piles SHENG Yan, LI Jia Journal of Jishou University(Natural Sciences Edition)    2023, 44 (4): 47-54.   DOI: 10.13438/j.cnki.jdzk.2023.04.006 Abstract （229）      PDF（pc） （1272KB）（117）       Knowledge map    Save Cracks are a common disease affecting slope stability,in engineering,anti-slip piles are often used to reinforce the slopes for improvement of the stability of cracked slopes.A three-dimensional cracked slope rotational failure mechanism with anti-slip pile reinforcement is constructed in this paper,and the power expression of anti-slip pile lateral resistance is derived based on the assumption of the plastic state of soil between piles,and the safety factor of three-dimensional cracked slopes with different reinforcement locations and reinforcement density of anti-slip piles is calculated.Parametric studies imply that the anti-slip pile reinforcement measures can effectively reduce the maximum depth of cracks and significantly improves the stability of the slope.There is a significant negative correlation between the safety coefficient of cracked slopes and the maximum depth of cracks,which can be used as an effective indicator to determine the sensitivity of slopes to natural cracks.As the position of anti-slip piles moves from the slope toe to the slope crest,the safety factor of slopes first increases and then decreases,showing a significant unimodal behavior. Reference | Related Articles | Metrics | Comments（0） Select Strength Properties of Timber Beams Reinforced with CFRP Sheets XUE Meihui, WANG Jianxing Journal of Jishou University（Natural Sciences Edition)    DOI: 10.13438/j.cnki.jdzk.2020.01.010 Select Experimental Study on Properties and Improvement of Full-Strong Weathered Sandy Slate HU Min, YANG Guolin, ZHOU Hubo Journal of Jishou University（Natural Sciences Edition)    DOI: 10.13438/j.cnki.jdzk.2020.01.011 Select Numerical Analysis of Finger-Point Beams Reinforced with CFRP Strips XUE Meihui,WANG Jianxing,WEI Changxi Journal of Jishou University（Natural Sciences Edition)    DOI: 10.13438/j.cnki.jdzk.2018.04.010 Select Diffusion Law of Cement-Sodium Silicate Grout in Gravel Ground WU You-Ping journal6    2015, 36 (5): 63-67.   DOI: 10.3969/j.cnki.jdxb.2015.05.014 Abstract （2440）      PDF（pc） （917KB）（1791）       Knowledge map    Save Based on the seepage equation of the slurry in the porous media，the mathematical formulas of grouting flow time，grout amount，diffusion radius in gravel ground were derived.Under certain conditions，the grout viscosity of the cement-silicate grout change with time was obtained，the effects of grouting pressure and the time of cement-silicate grout arriving into ground on the grout diffusion radius in gravel ground were analyzed.The results indicate that the grout diffusion radius increase nonlinearly with the increase of the grouting pressure and decrease nonlinearly with the time of cement-silicate grout arriving into ground.The calculation results from mathematical formulas accord with the results of grouting engineering，which were grouted of cement-sodium silicate in gravel ground. Reference | Related Articles | Metrics | Comments（0） Select Experimental Study on the Modulus of Elasticity of Fibers Reinforced Cement-Based Composite Materials WANG Zi-Guo, LUO Xiao-Jun, LIU Hui journal6    2015, 36 (5): 68-70.   DOI: 10.3969/j.cnki.jdxb.2015.05.015 Abstract （2118）      PDF（pc） （325KB）（1579）       Knowledge map    Save Experimental study was conducted to investigate the modulus of elasticity and compressive strength of the steel fiber reinforced concrete and the polyacrylonitrile fiber reinforced rubber mortar.Results showed that compared with the short steel fiber reinforced concrete，the micro steel fiber reinforced concrete had a higher compressive strength and post modulus of elasticity.The incorporation of polyacrylonitrile fiber into rubber mortar can reduce the modulus of elasticity of the rubber mortar but improve its toughness and deformability. Reference | Related Articles | Metrics | Comments（0） Select Influence of Confining Pressure over Permeability of Fractured Maokou Limestone WANG Xing-Hong, WAN Wen, DUAN Yan-Ping journal6    2014, 35 (4): 46-49.   DOI: 10.3969/j.issn.1007-2985.2014.04.011 Abstract （2262）      PDF（pc） （1008KB）（1492）       Knowledge map    Save The impact of confining pressure on the permeability of fractured Maokou limestone.Maokou limestone sample was cored from coal dam was analyzed MTS815 rock mechanical system was used to research the permeability under different confining pressures and the same axial pressure.The test results showd that permeability decreased with confining pressure increase under the same axial pressure,and when confining pressure was low,permeability of fractured Maokou limestone changed largely with confining pressure increase;on the contrary,the permeability changed relatively little when confining pressure was high.Volumetric stress,permeability coefficient and osmotic pressure were fitted well by exponential function. Reference | Related Articles | Metrics | Comments（0） Select FEA on Settlement of Pile-Supported Georeinfoced Pavement ZHOU Jing-Zhou, MA Shi-Cheng, ZHUO De-Bing journal6    2014, 35 (4): 50-53.   DOI: 10.3969/j.issn.1007-2985.2014.04.012 Abstract （2231）      PDF（pc） （614KB）（1548）       Knowledge map    Save A simplified Ansys finite element  model is proposed for modeling pile-supported georeinforced pavement.The Winkler springs with different constant are used to simulate the behavior of the piles and the soft soil.The solution from the Ansys is achieved consistent with the experiment data.The finite element parameters analysis shows that the setttlement decreases when the values of compression modulus of the granulars,elasticity modulus of the geosynthetic or the reaction coefficient of the piles keep rising.And when these parameters increase to a certain degree,the settlement decrease would not go further.Meanwhile,the effects of layer number on settlement can be neglected. Reference | Related Articles | Metrics | Comments（0） Select Geotechnical Engineering Field and Foundation Stability Evaluation LIAO Jian journal6    2014, 35 (4): 54-58.   DOI: 10.3969/j.issn.1007-2985.2014.04.013 Abstract （2552）      PDF（pc） （358KB）（2062）       Knowledge map    Save Geotechnical engineering field and foundation stability evaluation is the important basis of foundation design and construction.Correct evaluation shows the engineering geological conditions and characteristics of geotechnical engineering,which is relevant  safe,reliable and economical to engineering design and construction.According to the project of Xichang Sunshine Experimental School,and combining with the characteristics of the natural geological environment and engineering,detailed geotechnical engineering data and geotechnical parameters required for the design and construction are put forward.The geotechnical engineering evaluation of the building foundation for the construction drawing of the project and the required engineering geological data are provided.The types of foundation,foundation forms,foundation treatment are clarified,and suggestions for prevention of unfavorable geological conditions are given. Reference | Related Articles | Metrics | Comments（0） Select Influence Analysis of Perpendicular Crossing Pipe Jacking Constructed Above Existing Shield Tunnel YANG Guo-Yue, LIU Hao-Hang, YIN Zhi-Zheng, ZHONG Zheng-Yi journal6    2014, 35 (2): 57-61.   DOI: 10.3969/j.issn.1007-2985.2014.02.013 Abstract （2763）      PDF（pc） （565KB）（1856）       Knowledge map    Save Based on the construction of a sewer pipeline built perpendicularly above a existing shield tunnel in Hangzhou,the pipe jacking construction procedure was simulated by software FLAC3D,and verified reasonable after comparing the simulation results with the measured results.By changing the pipe diameter,pipe material and surrounding soil’s characteristic of the shield tunnel,its displacement rule of existing shield tunnel was analyzed.The studies showed that the max vertical and horizontal displacement of the shield tunnel  happened under the sewer pipeline,and the further away from the pipe jacking line,the smaller the deformation;the more diameter of sewer pipeline’s pipe,the more displacements of existing shield tunnel,and the influence of the sewer pipe diameter on vertical displacement was significantly greater than the horizontal displacement;the less elastic modulus of sewer pipe,the more displacements of the shield tunnel;the more elastic modulus of the soil layer,the less displacements of the shield tunnel. Reference | Related Articles | Metrics | Comments（0） Select Analysis for Interaction Frame Structure,Raft Foundation and Subsoil HU Hong-Bo, CHEN Rui-Lin, CAO Su-Gong, TANG Shi-Jiang, TANG Zhang, XIAO Xin-Qiang journal6    2014, 35 (2): 62-64.   DOI: 10.3969/j.issn.1007-2985.2014.02.014 Abstract （2722）      PDF（pc） （1390KB）（1655）       Knowledge map    Save Considering the interaction of frame structure,raft foundation and ground base by using the numerical simulation method of ANSYS procedure and the condition of the stationary balance of the linked point between frame structure,raft foundation and the distortion harmony condition,the method of the interaction of frame structure,raft foundation and subsoil was formed.And comparson with the conventional design of frame structure in column internal force and column bending moment was made.Results show that when considering the interaction,the raft foundation deformed “basin shape”,and frame structure stress was re-distributed.Angle axial force increased,and the side column and the column axial force decreased,and the moment also significantly increased.Settlement of rafts of different thickness was different;with the increase of thickness,the maximal settlement became smaller. 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