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公路钢波纹管涵洞受力与变形特性及应用研究
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摘要
针对钢波纹管涵洞在公路工程使用中设计理论与方法存在的问题,论文结合工程实际,采用理论分析、现场试验和室内模拟试验,研究了钢波纹管涵洞的受力与变形特性及其设计计算方法、施工技术与质量控制标准。主要成果如下:
     1.通过现场试验,研究了钢波纹管涵洞的受力与变形特性,分析了钢波纹管涵洞在不同填土高度和行车荷载作用下的受力与变形规律;探明了钢波纹管涵洞在不同填土高度作用下管顶及其正交位置为受力与变形最不利;提出高填土情况下以涵洞顶部土压力控制设计。
     2.采用自主研发的与实际路基涵洞埋设条件相似的大型室内模拟试验平台,研究了管径、填土高度等因素变化时钢波纹管涵洞受力与变形特性;弄清了相同钢波纹管设计参数情况下直径小于75cm和大于75cm在填土荷载作用下受力与变形的本质区别;推断了不同管径随填土荷载增加最先发生破坏的可能性位置。
     3.基于数值仿真方法,分析了填土高度、管径、地基土模量及波纹参数变化时的受力与变形特性及其变化规律;地基土模量变化时涵顶竖向土压力变化大;管顶填土高度大于5m时可忽略车辆荷载。将数值计算结果分别与室内模拟试验和现场试验成果进行了对比分析,确定了埋设条件、地形条件、填土土性和施工方法等因素对钢波纹管受力与变形特性的影响。
     4.采用弹性理论,考虑涵洞的埋设条件、波纹壁厚等因素,建立了钢波纹管涵洞在填土荷载作用下的变形计算公式,分析讨论了公式的工程应用,并与室内模拟试验、现场试验、数值计算等分析成果进行了对比分析,结果表明与数值计算成果吻合较好,该公式为钢波纹管涵洞设计提供了理论依据。
     5.提出了钢波纹管涵洞的设计计算方法以及可供实际工程参考的波纹设计技术参数,克服了现有钢波纹管涵洞单一尺寸用于任何工程条件存在的技术缺陷;建立了公路钢波纹管涵洞的施工质量控制标准并提出合理的施工工艺,为该技术的相关技术规范的制定与广泛应用奠定了基础。
     论文研究成果解决了目前公路建设中钢波纹管涵洞工程应用中的技术难点,具有重要的理论与工程实用价值,推广应用前景广阔。
In view of the factors in design theory and method of corrugated steel pipeculvert that is now in service in highway engineering. This article that was combinedwith the engineering practice adopted theoretical analysis, field test and simulationtest, studied force deformation characteristic of corrugated steel pipe culvert and itsdesign calculation methods, construction technology, and quality control standards.The main results were shown as the following:
     1. Stress deformation characteristic of the corrugated steel pipe culvert wasstudied through the field test, the law of stress and strain in the corrugated steel pipeculvert was analyzed under the action of different height of the filling soil and drivingload; the pipe top and orthogonal position were the place where stress and thedeformation were in the most unfavorable condition in the corrugated steel pipeculvert; control design of earth pressure under high-filled in culvert crown wassuggested.
     2. A large indoor simulation experiment platform which was similar to thepractical embankment bury conditions of culvert was developed independently. Thispaper studied the stress and deformation characteristics of corrugated steel pipeculvert under different pipe diameters, filling height and other factors. This paperpresented the essential difference of stress and deformation under the filling loadbetween the pipe diameter which was more than75cm and less than75cm whendesign parameters of the corrugated steel pipe culvert were in the same condition. Andalso, the probable location broken first with the increase of fill load under differentpipe diameters was inferred.
     3. Based on the numerical simulation method, this paper analysed the stressdeformation characteristic and change law of corrugated steel pipe culvert when thefill height, pipe diameter, soil modulus and corrugation parameters changed. The earthpressure on the culvert crown changed greatly when the soil modulus varied. And also,the vehicle load could be ignored when the fill height was more than5m. After a comparative analysis of the numerical results with the indoor model test and field testresults, the effects of bury conditions, terrain conditions, soil properties, constructionmethods and other factors on the engineering characteristics of corrugated steel pipeculvert were obtained.
     4. The buried condition and corrugated wall thickness of the culverts wasconsidered by using elastic theory, the deformated calculation formula of corrugatedsteel pipe culvert which under the filling load was established, the formula of theengineering application was analysed, and the analytical results of model test, fieldtest, numerical calculation were compared, the results show that the numericalcalculation were in good agreement with the model test and field test, the designtheory of corrugated steel pipe culvert was provided by this formula.
     5. The design calculation methods of the corrugated steel pipe culvert and itsdesign technical parameters which could be used as reference in actual were offered.The technical defects which were caused by single size of the existing corrugatedsteel pipe culverts were overcome. The control standards of the construction qualityof the highway subgrade corrugated steel pipe culvert were established, and theproper construction technology was put forward, and it laid a foundation for therelated compilation of the technical specification and the wide use of this technology.
     The research results solve the technical difficulties in engineering application ofthe corrugated steel pipe culvert, which have an important theory and project practicalvalue and have brighted application prospect.
引文
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