湿陷性黄土路基病害分析与处理

在黄土地区,由于黄土特有的湿陷性导致的路基病害主要有路堤陷穴、下沉、路堤冲蚀及路堑坡面坍塌等.本文对以上湿陷性黄土路基病害的机理进行了分析,提出了针对性的防治及处理措施,为T程顺利进行提供借鉴.     

黄土挖方路基合理压实标准研究

现行路基设计规范对黄土路堑地段的压实度要求采用与其它地区一样的标准,0-30cm压实度为95％,相当于路堤的压实度要求,这是不合理的。为针对规范中不合理的压实度标准,提出较高的、合理的湿陷性黄土路堑地段的压实要求,改进设计和提高施工技术,本课题组进行大量室内试验的同时,现场测定不同压实机械的影响深度,通     

天平铁路湿陷性黄土深路堑设计

天平铁路湿陷性黄土深路堑工程设计采用了阶梯式边坡、坡脚支挡加固、消除湿陷性、引排地表水多重措施相结合的设计理念,克服了黄土湿陷性、深路堑边坡稳定性、施工开挖困难等难题,为湿陷性黄土地区铁路及公路建设中同类工程提供了工程实例和参考。     

浅析湿陷性黄土地区公路病害防治

我国湿陷性黄土分布面积广,公路建设经常穿越该土质地段。针对湿陷性黄土特有的工程地质性质,分析该土质路基沉陷、路堑和路堤边坡的变形、黄土陷穴等病害,并提出了处理措施。     

我国北方黄土山区公路排水系统设计研究

对黄土路堑边坡和路堤边坡降雨侵蚀规律、路面排水系统进行了较详细的研究,提出了黄土山区公路排水系统设计的原则和若干技术措施.     

浅谈黄土地区高等级公路高路堤施工技术

随着公路交通事业的发展，黄土地区高等级公路建设加快，高等级公路的要求越来越高，本文对黄土地区高等级公路高路堤的施工技术作简明介绍。     

黄土地区坝式路堤地基处理的探讨

黄土地区地形起伏较大,地貌、地层较复杂,黄土梁茆、沟源密布、冲沟发育,坝式路堤较普通高填方路堤和桥梁工程而言,对于甘肃省干旱和半干旱黄土地区具有集水和改善生态环境的作用,在黄土地区修建高等级公路时,采用坝式路堤跨越沟谷,对于改善当地群众生活生产及出行十分有利.目前,坝式路堤已普遍存在于甘肃公路建设项目中,如G312、G211、巉柳高速、马陇公路等.为确保坝式路堤稳定性和耐久性,必须进行地基处理,根据笔者实际参建的通渭至榜罗革命遗址公路建设项目中14处平均填筑高度30 m以上的高填路堤,及6处黄土地区坝式路堤地基处理经验,对于黄土地区坝式路堤地基处理措施和设计具有一定的参考价值.     

通灌铁路片石混凝土挡墙施工技术

一、工程概况 东北东部铁路通道新建通化至灌水铁路，全长179．54km，路基长度92．94km，桥梁长度32．38km，隧道长度54．22km。陡坡路堤、深路堑防护部分采用C25片石混凝土重力式挡土墙挡护，全线片石混凝土重力式挡墙共计约64000m^3，设计要求片石掺入量不大于总体积的20％。设计的片石混凝土挡墙横断面见图1：     

西北地区某市政道路湿陷性黄土地基处理问题探讨

西北地区广泛分布黄土状粉土,随着西北地区经济发展,建设工程越来越多。但黄土在一定压力作用下,受水浸湿后产生显著湿陷性,对建设工程有明显的影响。本文以西北地区某市政道路工程为例,该道路根据该地区地质情况,采取了垫层法、低路堤或路堑挖除换填、冲击碾压、强夯法、灰土挤密法等设计,提高工程范围内地基承载力,以保证工程的顺利实施。     

高液限膨胀土的工程特性及路基处治应用

琼北地区高液限粘土分布广泛,在公路建设中,为降低工程成本,经常利用路堑挖土方作为路堤填土方,但在路基应用中出现多种病害。本文通过分析高液限膨胀土的特性,以养护、工程实例探讨高液限粘土路基的应用处治方法。     

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     

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

正~~