水泥土搅拌法加固冲填土软土地基的微观试验

针对某工程冲填土软土地基水泥土搅拌法处理过程中的冲填土与自然软土加固效果差异问题,从化学成分与物理结构等微观角度出发,分别对冲填土和自然软土的原状样、加固样进行了X射线衍射试验和扫描电镜试验两种微结构试验,对比分析了导致这种加固效果差异的微观机理及其形成原因.研究发现,物理微结构对冲填土软土地基的水泥土搅拌法加固效果存在重要的影响.虽然水泥土搅拌法加固冲填土与自然软土的化学反应是类似的,但加固后的土体在物理微结构特征上却差异显著,并导致加固土体宏观强度表现上的不同.因此,应采取相应的施工措施,改良冲填土的微观结构特征,优化地基加固效果.     

水泥土搅拌法的室内试验研究

为研究水泥搅拌法加固软土的特点和主要力学特征,进行了室内多因素影响下水泥土的配比试验,定量分析了龄期、水泥种类和水泥掺入比对水泥土力学性能的影响,揭示了各种因素对水泥土抗压强度的影响规律.单轴压缩试验结果表明:水泥土抗压强度随着龄期的增长而提高;水泥种类、水泥掺入比以及养护龄期是影响水泥土抗压强度的主要因素.     

深层搅拌桩在基坑支护中的应用

深层搅拌桩是加固软土地基的一种新方法,目前也广泛使用于基坑支护。它是利用水泥、石灰等材料作为固化剂通过深层搅拌机械将软土和固化剂(浆体或粉体)强制搅拌,利用固化剂和软土之间所产生的一系列物理、化学反应,使软土硬结成具有整体性、水稳定性和一定强度的桩体。深层搅拌法最适宜于各种成因的软粘土,包括淤泥、淤泥质土、粘土和粉质粘土等。加固深度从数米到50余米。水泥土加固的基本原理是水泥与土经搅拌后发生一系列的化学反应而逐步硬化。水泥和土之间的强制搅拌越充分,土块粉碎得越小,水泥分布到土中越均匀,则水泥土结构强度的离散性越小,其总体强度也越高。     

水利工程中基础处理水泥土的重要性

水泥土广泛用在软土地基处理，软土地基因为沉降量较大，承受力低，冻胀性低等不良工程性质，所以造成工程质量低下。水泥土解决法主要用水泥当作固化剂，通过固定的搅拌机械，现场将软土与固化剂进行搅拌，要达到软土硬结成具有一定整体性、水稳性以及一定强度的水泥加固土．才能提高地基承载力和减小沉降量及其它特征变形。     

水泥土搅拌桩连拱抗滑墙加固软土地基边坡模型试验及数值分析

为验证水泥土搅拌桩连拱抗滑墙加固软土地基边坡的作用机制,在进行了系列室内模拟试验的基础上,对模型试验进行了数值分析。采用有限元方法,分析了水泥土搅拌桩连拱抗滑墙的传力机制,不同深度土层分担水平推力分布形式及大小以及加固区不同深度土层剪力分布的规律。研究表明,有限元数值分析方法计算所得到的结果与模型试验的结果比较接近,并证明了自行设计制作的模型槽对水泥土搅拌桩连拱抗滑墙加固软土地基边坡等类似工程进行室内模型试验的可行性。     

水泥搅拌桩加固软土路基与试验检测方法分析

水泥搅拌桩加固软土路基,采用深层搅拌法打穿软弱土层、通过变桩距设计形成沉降过渡段,经过超载预压后大大降低了桥台与引道之间的工后沉降差．对于预防桥头跳车有良好的效果。本文以某高速公路段水泥搅拌桩处理桥头软土路基为工程背景,在简要介绍了水泥土搅拌桩的基本理论后,对加固技术和试验检测方法等做了分析。     

纳米硅粉水泥土抗腐蚀性能研究

水泥土搅拌法处理近海软土时, 水泥土常处于腐蚀性环境中。系统研究掺入纳米硅粉的水泥土的抗腐蚀性能, 为水泥土抗腐蚀性能改良、近海区软土水泥土搅拌法加固提供依据。选取珠江三角洲典型的淤泥质粘土, 按天然含水量配制试验用土,加入掺入比为0%～4%的纳米硅粉配制水泥土试件, 在腐蚀性硫酸盐溶液和纯水中养护到不同龄期, 对其进行无侧限抗压强度对比试验, 得到了水泥土强度与纳米硅粉含量及腐蚀性养护环境关系的变化规律。主要结论是: 两种养护环境下, 纳米硅粉提高水泥土强度的长期效果比短期效果显著, 龄期90 d内纳米硅粉掺入比为2%的水泥土强度最大; 但龄期180 d时水泥土强度随纳米硅粉掺量的增加而增加; 硫酸盐腐蚀环境能加速纳米硅粉和水泥水化产物的二次水化反应, 大幅提高水泥土的强度, 纳米硅粉能显著提高水泥土的抗腐蚀性能; 龄期180 d时, 养护在硫酸盐溶液中纳米硅粉掺入比为2%～4%的水泥土, 强度比掺入比为0%的水泥土强度高(2～3)倍, 也比相同配比养护在纯水中水泥土强度高15%～20%。     

水泥土搅拌桩在工程中的应用

水泥土搅拌法是加固饱和软黏土地基的一种成熟方法，它利用水泥、石灰等材料作为固化剂的主剂，通过特制的深层搅拌机械。在地基中就地将软土和固化剂（浆液状和粉体状）强制搅拌，利用固化剂和软土之间所产生的一系列物理一化学反应，使软土硬结成具有整体性、水稳陛和一定强度的优质地基。本文水泥土搅拌桩的加固原理重点论述了水泥土搅拌桩在工程中的应用。     

水泥土搅拌桩在软土地基的应用与实践

本文介绍采用水泥土搅拌桩成功解决软土地基加固的施工问题.详细地阐述了水泥土搅拌桩施工工艺流程、方法、质量标准及要求.给出了控制质量的具体做法.     

水泥粉煤灰搅拌桩加固饱和有机质软土的工程实践与应用

从室内配合比试验及工程实践探讨粉煤灰对饱和有机质软土加固效果及提高水泥搅拌桩水泥土强度机理,值得今后设计在这类软土加固工程借鉴并推广应用。     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

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