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A hybrid artificial bee colony algorithm and support vector machine for predicting blast-induced ground vibration

Earthquake Engineering and Engineering Vibration 2022年第4期21卷 861-876页

作者： Zhu Chun Xu Yingze wu yongxin He Manchao Zhu Chuanqi Meng Qingxiang Lin Yun School of Earth Sciences and Engineering Hohai UniversityNanjing 210098China State Key Laboratory for Geomechanics&Deep Underground Engineering China University of Mining andTechnology(Beijing)Beijing 100083China State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines AnhuiUniversity of Science and TechnologyHuainan 232001China College of Petroleum Engineering Xi’an Shiyou UniversityXi’an 710065China School of Resources and Safety Engineering Central South UniversityChangsha 410083China

Because nearby construction has harmful effects,precisely predicting blast-induced ground vibration is critical.In this paper,a hybrid artificial bee colony(ABC)and support vector machine(SVM)model was proposed for predicting the value of peak particle velocity(PPV),which is used to describe blast-induced ground vibration.To construct the model,5 potentially relevant factors,including controllable and uncontrollable parameters,were considered as input parameters,and PPV was set as the output parameter.Forty-five samples were recorded from the Hongling lead-zinc mine.An ABC-SVM model was developed and trained on 35 samples via 5-fold cross-validation(CV).A testing set(10 samples)was used to evaluate the prediction performance of the ABC-SVM model.SVM and four empirical models(United States Bureau of Mines(USBM),Amraseys-Hendron(A-H),Langefors-Kihstrom(L-K),and Central Mining Research Institute(CMRI))also were introduced for comparison.Next,the performances of the models were analyzed by using 3 statistical parameters:the correlation coefficient(R2),root-mean-square error(RMSE),and variance accounted for(VAF).ABC-SVM had the highest R2 and VAF values followed by the SVM,A-H,USBM,CMRI,and L-K methods.The results demonstrated that ABC-SVM outperformed SVM and the empirical predictors for predicting PPV.Moreover,the best results from the R2,RMSE,and VAF indices were 0.9628,0.2737,and 96.05%for the ABC-SVM model.The sensitivities of the parameters also were investigated,and the height difference between the blast point and the monitoring station was found to be the parameter that had the most influence on PPV.

关键词： recycled concrete frame-shear wall concealed bracings shaking table test nonlinear time-history response analysis

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Simulation of spatially correlated earthquake ground motions for engineering purposes

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Earthquake Engineering and Engineering Vibration 2011年第2期10卷 163-173页

作者： wu yongxin Gao Yufeng Li Dayong Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai University Nanjing 210098 China Geotechnical Research Institute Hohai University Nanjing 210098 China Department of Civil Engineering Shandong University of Science and Technology Qingdao 266510 China

A new model to simulate spatially correlated earthquake ground motions is developed. In the model, the main factors that characterize three distinct effects of spatial variability, namely, the incoherency effect, the wave-passage effect and the site-response effect, are taken into account, and corresponding terms/parameters are incorporated into the well known model of uniform ground motions. Some of these terms/parameters can be determined by the root operation, and others can be calculated directly. The proposed model is first verified theoretically, and examples of ground motion simulations are provided as a further illustration. It is proven that the ensemble expected value and the ensemble auto-/cross-spectral density functions of the simulated ground motions are identical to the target spectral density functions. The proposed model can also be used to simulate other correlated stochastic processes, such as wave and wind loads.

关键词： ground motions simulation root operation incoherency effect wave-passage effect site-response effect

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A note on near-field site amplification effects of ground motion from a radially inhomogeneous valley

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Earthquake Engineering and Engineering Vibration 2018年第4期17卷 707-718页

作者： Zhang Ning Gao Yufeng wu yongxin Zhang Fei Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai University College of Civil and Transportation Engineering Hohai University

To improve the understanding of the near-field soil and topographic amplification effects, an analytical solution by the authors for the scattering of plane SH waves by a radially inhomogeneous semi-cylindrical valley is extended to the case of a line source of cylindrical SH waves. Upon confirmation of its accuracy with past exact solutions for a homogeneous and an inhomogeneous semi-cylindrical valley under far-field plane SH waves, the extended solution is used to calculate the ground motion amplification factors for both the homogeneous and inhomogeneous valleys subjected to near-field waves. A comprehensive parametric study is conducted with respect to the location of the wave source, the dimensionless frequency of the incident waves, and the inhomogeneity degree of the covering soil layer. It is found that more amplifications and reductions of ground motions will occur within a certain range in and around the valley as the sources are located further. Consistent with the far-field case, it is confirmed that an increase of the degree of inhomogeneity of the covering soil layer generally amplifies the ground motions significantly.

关键词： elastic SH-waves wave scattering and diffraction ground motion amplification valley canyon

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Effects of vertical seismic acceleration on 3D slope stability

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Earthquake Engineering and Engineering Vibration 2016年第3期15卷 487-494页

作者： Zhang Fei Gao Yufeng wu yongxin Zhang Ning Qiu Yue Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai University

The conventional pseudo-static approach often neglects the effect of the vertical＇ seismic acceleration on the stability of a slope, but some analyses under plane-strain （2D） conditions show a significant effect on the slope stability. The purpose of this study is to investigate the effect of the vertical acceleration on the safety of three-dimensional （3D） slopes. In the strict framework of limit analysis, a 3D kinematically admissible rotational failure mechanism is adopted here for 3D homogeneous slopes in frictional/cohesive soils. A set of stability charts is presented in a wide range of parameters for 3D slopes under combined horizontal and vertical seismic loading conditions. Accounting for the effects of the vertical seismic acceleration, the difference in safety factors for 3D slopes can exceed 10%, which will significantly overestimate the safety of the 3D slopes.

关键词： slope stability seismic effects limit states three-dimensional analysis vertical acceleration

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钢管混凝土键连接框架梁和剪力墙的受剪性能

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沈阳建筑大学学报（自然科学版） 2024年第1期40卷 38-46页

作者：李明刘栩邑吴潜吴欣禹吴永新沈阳建筑大学土木工程学院辽宁沈阳110168

目的研究钢管混凝土键连接框架梁和剪力墙的受剪性能,为工程应用提供设计依据。方法应用有限元分析软件ABAQUS对比钢管混凝土键连接与现浇连接梁墙的结构受剪性能,分析前者受剪机理及不同因素对受剪性能的影响。结果钢管混凝土键连... 详细信息

目的研究钢管混凝土键连接框架梁和剪力墙的受剪性能,为工程应用提供设计依据。方法应用有限元分析软件ABAQUS对比钢管混凝土键连接与现浇连接梁墙的结构受剪性能,分析前者受剪机理及不同因素对受剪性能的影响。结果钢管混凝土键连接梁墙的结构承载力和延性系数较现浇结构分别提高约10%和34%;钢材强度从Q235到Q390,初始刚度增加8.44%;截面高度从100 mm到120 mm,延性系数提高17.73%;截面厚度每增加2 mm,承载力提高约15%;截面长度和混凝土强度等级对承载力、初始刚度和延性系数的影响均小于15%,纵向距离对其受剪性能几乎无影响。结论采用钢管混凝土键连接梁墙的结构总体受剪性能优于现浇结构;钢材强度和截面厚度分别是影响初始刚度和承载力的主要因素。

关键词：钢管混凝土键框架-剪力墙结构梁墙试件抗剪性能有限元分析

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Approximation approach to the SRM based on root decomposition in the simulation of spatially varying ground motions

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Earthquake Engineering and Engineering Vibration 2013年第3期12卷 363-372页

作者： wu yongxin Gao Yufeng Li Dayong Xu Changjie Ali H Mahfouz Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai University Institute of Engineering Safety and Disaster Prevention Hohai University Geotechnical Research Institute Hohai University Department of Civil Engineering Shandong University of Science and Technology Research Center of Coastal and Urban Geotechnical Engineering Zhejiang University College of Engineering Jazan University

The spectral representation method （SRM） is widely used to simulate spatially varying ground motions. This study focuses on the approximation approach to the SRM based on root decomposition, which can improve the efficiency of the simulation. The accuracy of the approximation approach may be affected by three factors： matrix for decomposition, distribution of frequency interpolation nodes and elements for interpolation. The influence of these factors on the accuracy of this approach is examined and the following conclusions are drawn. The SRM based on the root decomposition of the lagged coherency matrix exhibits greater accuracy than the SRM based on the root decomposition of the cross spectral matrix. The equal energy distribution of frequency interpolation nodes proposed in this study is more effective than the counter pith with an equal spacing. Elements for interpolation do not have much of an effect on the accuracy, so interpolation of the elements of the decomposed matrix is recommended because it is less complicated from a computational efficiency perspective.

关键词： ground motions simulation spectral representation method spatially varying approximation root decomposition

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藁本内酯调控PKD1/HIF-1α/VEGF通路对心力衰竭大鼠的改善作用

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吉林大学学报（医学版） 2024年第1期50卷 42-49页

作者：张岚武永新张涛王东伟郑州大学附属郑州中心医院心血管内科河南郑州450001

目的:探讨藁本内酯对心力衰竭大鼠心功能和血管生成的影响,并分析其对蛋白激酶D1(PKD1)/缺氧诱导因子1α(HIF-1α)/血管内皮生长因子(VEGF)通路的调节作用。方法:SD大鼠随机分为假手术组、模型组、藁本内酯组、PKD1/HIF-1α/VEGF信号通... 详细信息

目的:探讨藁本内酯对心力衰竭大鼠心功能和血管生成的影响,并分析其对蛋白激酶D1(PKD1)/缺氧诱导因子1α(HIF-1α)/血管内皮生长因子(VEGF)通路的调节作用。方法:SD大鼠随机分为假手术组、模型组、藁本内酯组、PKD1/HIF-1α/VEGF信号通路阻断剂CID755673(CID)组和藁本内酯+CID组,采用冠状动脉左前降支结扎法建立心力衰竭大鼠模型,藁本内酯组大鼠尾静脉注射藁本内酯20 mg·kg^(-1),CID组大鼠腹腔注射CID 50 mg·kg^(-1),藁本内酯+CID组大鼠腹腔注射CID 50 mg·kg^(-1)后尾静脉注射藁本内酯20 mg·kg^(-1),每日1次,连续4周。采用心脏超声检查各组大鼠心功能指标,2,3,5-氯化三苯基四氮唑(TTC)染色法检测各组大鼠心肌梗死面积百分率,HE染色观察各组大鼠心肌组织病理形态表现,实时荧光定量PCR法(RT-qPCR)法和蛋白印迹法检测各组大鼠缺血区心肌组织中PKD1、HIF-1α、CD31和VEGFmRNA及蛋白表达水平。结果:与假手术组比较,模型组和CID组大鼠心肌细胞形态发生改变,细胞间隙增宽,排列紊乱,可见肌纤维断裂和炎性细胞浸润;藁本内酯组和藁本内酯+CID组大鼠心肌纤维排列相对整齐,心肌纤维断裂相对较少,炎性细胞数减少。与假手术组比较,模型组大鼠左心室射血分数(LVEF)和左心室短轴缩短率(LVFS)降低(P<0.05),左心室收缩末期内径(LVESD)和左心室舒张末期内径(LVEDD)增大(P<0.05),心肌组织中PKD1、HIF-1α、CD31和VEGF mRNA及蛋白表达水平降低(P<0.05);与模型组比较,藁本内酯组大鼠LVEF和LVFS升高(P<0.05),LVESD和LVEDD减小(P<0.05),心肌梗死面积百分率降低(P<0.05),心肌组织中PKD1、HIF-1α、CD31和VEGF mRNA及蛋白表达水平升高(P<0.05);与模型组比较,CID组大鼠LVEF和LVFS降低(P<0.05),LVESD和LVEDD增大(P<0.05),心肌梗死面积百分率升高(P<0.05),心肌组织中PKD1、HIF-1α、CD31和VEGF mRNA及蛋白表达水平降低(P<0.05);与藁本内酯组比较,藁本内酯+CID组大鼠LVEF和LVFS明显降低(P<0.05),LVESD和LVEDD增大(P<0.05),心肌梗死面积百分率升高(P<0.05),心肌组织中PKD1、HIF-1α、CD31和VEGF mRNA及蛋白表达水平降低(P<0.05);与CID组比较,藁本内酯+CID组大鼠LVEF和LVFS升高(P<0.05),LVESD和LVEDD减小(P<0.05),心肌梗死面积百分率降低(P<0.05),心肌组织中PKD1、HIF-1α、CD31和VEGF mRNA及蛋白表达水平升高(P<0.05)。结论:藁本内酯可通过激活PKD1/HIF-1α/VEGF通路发挥促进心力衰竭大鼠血管生成、缩小其心肌梗死面积和改善心功能的作用。

关键词：心力衰竭血管再生藁本内酯蛋白激酶D1 缺氧诱导因子1α 血管内皮生长因子

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Study of the approximate approaches to the POD based spectral representation method

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Science China(Technological Sciences) 2013年第4期56卷 970-979页

作者： wu yongxin GAO YuFeng LI DaYong XU ChangJie MAHFOUZ Ali Hasson Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai University Institute of Engineering Safety and Disaster Prevention Hohai University Geotechnical Research Institute Hohai University Department of Civil Engineering Shandong University of Science and Technology Research Center of Coastal and Urban Geotechnical Engineering Zhejiang University College of Engineering Jazan UniversityJazanSaudi Arabia

The spectral representation method (SRM) is most widely used in simulating the stochastic field.The proper orthogonal decomposition (POD) based SRM is an important form.This paper investigates the approximate approaches to the POD-based SRM in simulating two typical problems,i.e.,the seismic ground motion and wind velocity fields simulations.Then,the accuracy resulting from the power spectral density matrix-based POD method (PSRM) is compared to that of the coherency matrix-based POD method (CPSRM).It is concluded that the CPSRM maintains a much higher accuracy than the PSRM.In the CPSRM,the linear interpolation of eigenvectors and third-order polynomial interpolation of eigenvalues can be accepted to attain high accuracy;the linearly distributed interpolation nodes are effective in the ground motions simulation;however,the exponentially distributed interpolation nodes are effective in the wind velocity simulation.

关键词： POD 近似方法谱表示地震地面运动过氧化物酶相关性矩阵运动模拟插值节点

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Reliability analysis of excavated slopes in undrained clay

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Frontiers of Structural and Civil Engineering 2023年第11期17卷 1760-1775页

作者： Shuang SHU Bin GE yongxin wu Fei ZHANG Key Laboratory of the Ministry of Education for Geomechanics and Embankment Engineering College of Civil and Transportation EngineeringHohai UniversityNanjing 210098China

A novel approach based on the upper bound theory is proposed to assess the stability of excavated slopes with spatially variable clay in undrained conditions.The proposed random limit analysis is a combination of the deterministic slope stability limit analysis together with random field theory and Monte Carlo simulation.A series of analyses is conducted to verify the potential application of the proposed method and to investigate the effects of the soil undrained shear strength gradient and the spatial correlation length on slope stability.Three groups of potential sliding surfaces are identified and the occurrence probability of each sort of failure mechanism is quantified for various slope ratios.The proposed method is found to be feasible for evaluating slope reliability.The obtained results are helpful in understanding the slope failure mechanism from a quantitative point of view.The paper could provide guidance for slope targeted local reinforcement.

关键词： slope stability spatial variability limit analysis random field clay

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Scattering of SH waves induced by a symmetrical V-shaped canyon: a unified analytical solution

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Earthquake Engineering and Engineering Vibration 2012年第4期11卷 445-460页

作者： Zhang Ning Gao Yufeng Li Dayong wu yongxin Zhang Fei Geotechnical Research Institute Hohai University Key Laboratory of Geomechanics and Embankment Engineering(Hohai University) Ministry of Education College of Civil Engineering&Architecture Shandong University of Science and Technology

This paper reports a series solution of wave functions for two-dimensional scattering and diffraction of plane SH waves induced by a symmetrical V-shaped canyon with different shape ratios. A half-space with a symmetrical V-shaped canyon is divided into two sub-regions by using a circular-arc auxiliary boundary. The two sub-regions are represented by global and local cylindrical coordinate systems, respectively. In each coordinate system, the wave field satisfying the Helmholtz equation is represented by the separation of variables method, in terms of the series of both Bessel functions and Hankel functions with unknown complex coefficients. Then, the two wave fields are described in the local coordinate system using the Graf addition theorem. Finally, the unknown coefficients are sought by satisfying the continuity conditions of the auxiliary boundary. To consider the phase characteristics of the wave scattering, a parametric analysis is carried out in the time domain by assuming an incident signal of the Ricker type. Surface and subsurface transient responses demonstrate the characteristics and mechanisms of wave propagating and scattering.

关键词： SH-wave scattering V-shaped canyon topographic effect wave propagation earthquake ground motion wave function expansion method

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