基于人工蜂群算法的船闸高边坡岩体力学参数反分析

人工蜂群算法(ABCA)是一种模仿自然界中蜜蜂群采集蜂蜜的自组织过程,达到寻找复杂映射极值的智能算法.采用人工蜂群算法,对长江上游某船闸施工过程中,岩体开挖产生的高边坡进行岩体力学参数反分析.旨在通过反分析的手段得到的一组更加符合工程实际的岩体力学参数.将反分析得到的这些参数用于该船闸高边坡的开挖正算,并通过实际测点位移监测值和位移计算值的比较,评价反分析得到的这组参数的优劣性.     

基于差异进化算法的围岩参数识别

引入了一种新型智能优化算法差异进化优化算法,建立采矿巷道围岩参数的识别方法.基于正交设计和均匀设计方案进行巷道开挖的数值试验,建立围岩力学参数与监测位移的映射关系回归模型.以计算位移和监测位移的误差为适应值,采用差异进化优化算法进行参数识别.在探讨差异进化算法原理和参数识别步骤基础上,将该方法应用于金山店铁矿进路巷道分析.分析结果表明该算法具有优良的全局快速收敛性,是具有较强适应性的新型巷道参数识别方法,具有良好应用前景.     

隧道围岩力学参数反分析及工程应用

以大连地铁一号线学苑广场—海事大学区间过河段隧道工程为背景,基于一种新型优化算法——差异进化算法进行隧道围岩力学参数反分析,提出以位移值为指标的差异进化位移反分析方法及实现过程,并将反演得到的围岩力学参数应用到过河段隧道工程开挖方案比较及稳定性分析,验证了复杂地质条件下该方法的可行性和有效性.结果表明,该方法在复杂地质条件下具有较好的可行性,且对选取隧道施工方案、保证隧道安全具有一定的指导意义.同时,所得围岩力学参数也可进一步应用于其他类似工程的相关研究.     

岩石力学参数反演分析的优化算法

基于煤矿地下巷道开挖后实测位移，提出求解地下巷道各岩层弹性模量的位移反演模型，针对目标函数多极值性、收敛结果与初值及观测误差相关等问题，提出了一种位移反演分析优化算法，数值计算结果表明，本文所提出的数值方法反演的结果是唯一和稳定的。     

基坑变形数值分析中土体力学参数的确定方法

依托上海地区地铁车站基坑,提出了结合有限元的多目标反分析参数确定理论与算法,以不同开挖工况中的围护墙体水平位移和临近地表沉降作为目标,分析确定典型软土层的修正剑桥模型参数.对基坑开挖施工过程用ABAQUS进行有限元模拟,同时选取AMALGAM算法,利用Matlab对基坑工程中的土体参数进行反分析.结果发现,根据基坑开挖前一步实测变形确定的计算参数能够有效预测下一步开挖变形,开挖到一定深度时所确定的土体参数能够准确地预测后续步开挖的影响.证实了多目标反分析对后续施工步预测的精确度,并且得到了长寿路车站基坑第2~6步的9个土体参数反分析结果,可作为基坑工程的借鉴.     

基于节理岩体损伤本构的洞室位移反分析研究与应用

基于对洞室位移反分析中开挖扰动区处理方法的总结分析,探讨将节理岩体损伤本构应用于反分析研究中的实现方法。通过FLAC3D预留的二次开发接口,修改其内置应变软化模型的数值计算格式,即对位于屈服面以外的应力点采用修正应力张量分量的方式替代主应力修正的方式,使修改后的本构模型可适用于各向异性的节理岩体,同时结合FISH语言编制的节理裂隙几何参数随开挖过程的演化程序实现对节理岩体等效柔度张量的更新,从而完成节理岩体损伤本构的FLAC3D二次开发。采用基于支持向量回归机与PSO-DE优化算法的增量位移反分析方法,应用该本构模型对思林水电站地下厂房围岩参数进行反分析。研究结果表明:对于开挖于含成组展布且相对结构尺寸为小量的断续节理岩体内的地下洞室位移反分析问题,将节理岩体损伤本构引入其中是一个很好的尝试,扰动区内围岩的等效弹模平均降低约为20.13%,计算增量位移值与量测值的相对误差在7.54%~16.56%,反分析成果是合理和可靠的。     

边坡弹性模量反分析的模拟退火BP网络方法

通过模拟退火算法,对BP网络进行优化并编写了模拟退火BP网络程序,应用该程序对三峡永久船闸高边坡岩体弹性模量进行了位移反分析.结果表明,根据模拟退火BP网络反分析得到的弹性模量计算出的位移值和监测位移值差别较小.因此,模拟退火BP网络方法可以用于边坡岩体力学参数的反分析.     

基于进化支持向量机的岩土体位移反分析

简要介绍了支持向量机（SVM）及其进化支持向量机（ESVM）的基本思想，建立了基于进化支持向量机的岩土体材料参数反分析模型，并采用进化支持向量机来反演岩土体位移．通过Matlab优化工具箱解相应的优化函数来验证工程算例．由结果可知，进化支持向量机的位移反分析精度较高，相对误差小，有广阔的应用前景和实际意义．     

位移反分析的人工神经网络方法研究

各种传统位移反分析方法的反分析模型非常复杂,求解亦非常困难．本文应用人工神经网络原理,建立了位移反分析的人工神经网络方法,并应用该方法对所设定的一标准弹塑性问题的力学参数进行了反演,反演结果表明,所建立的位移反分析的人工神经网络方法具有模型简单、求解快捷等优点,且其精度亦能达到工程应用要求,因而可以在工程实际中应用。     

非线性位移时间序列分析模型的进化识别

引入进化算法的全局优化思想,结合时间序列分析的基本理论,提出了一种新的岩土结构变形非线性动力学演化特征的进化识别算法·设计了能自动确定输入时步长度以及非线性动力学模型结构和参数的分步进化方案,对非线性时间序列分析模型的结构和参数进行全局最优搜索·将该方法用于三峡永久船闸高边坡开挖变形的预测分析,取得了满意的效果,提供了一个有效的岩土工程设计与施工的分析工具·     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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