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污染对水泥土影响的力学试验及其损伤本构模型研究 【作者】赵永强 【导师】白晓红

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【作者】赵永强导师白晓红
2r5F.g:k6e+sx0【作者基本信息】太原理工大学,岩土工程,2008年,博士

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Z4a d"to+pM3c0【中文摘要】 水泥土技术由于其具有造价低、施工方法简便、在施工中无振动、无噪声、无地面隆起和对周围建筑物无有害影响等优点,而在各类土体加固工程中广泛使用。然而,水泥土的工程特点,常常遇见被加固的土体已经被污染或成桩水泥土处于含有侵蚀离子的环境中的问题,这些污染土体或者环境中含有的侵蚀性离子与水泥土具有较强的结晶分解作用,对水泥土的力学性能和耐久性产生重要影响,因此研究土体污染和侵蚀环境影响下的水泥土力学特性变化、化学侵蚀特点、建立水泥土损伤本构模型具有重要的理论意义和工程意义。为了适应工程中可能遇到的两类污染情况,配制了两种水泥土,一种是由污染土配制成的水泥土(简称水泥污染土),另一种是由无污染土配制成的水泥土(简称水泥土),首次对标准养护条件下的水泥污染土和侵蚀环境中浸泡的水泥土在不同龄期时的外表形态、破裂特征、抗压强度和应力—应变关系曲线等进行了详细的对比分析,结果表明,污染土较侵蚀环境对水泥土力学特性等方面的影响较弱。首先,SO42-离子在一定含量范围内的水泥污染土,其抗压强度较无污染水泥土不但没有降低,相反,其抗压强度有一定的提高;阳离子不同,使得SO42-对水泥污染土强度的...更多增强或削弱程度不同,结合电子显微镜扫描试验,对SO42-影响水泥污染土强度的原因,从微观、细观和化学机理三个方面进行了定性分析。通过大量试验结果,对实际水泥加固工程中污染土和侵蚀环境中各种离子的极限含量做了说明,对不同污染形式下各种离子对水泥污染土和水泥土的抗压强度修正系数进行了总结,并且把不同化合物、不同阴离子和阳离子对水泥土强度影响作用的强弱进行了排序,为污染土和侵蚀环境中水泥土的应用、施工和设计提供了一定的参考依据。其次,水泥污染土和侵蚀环境中的水泥土的应力—应变关系曲线,具有明显的线弹性阶段和塑性变形阶段,塑性变形与水泥土的侵蚀方式、侵蚀离子的种类和浓度紧密相关。针对水泥土的弹塑性变形特点,作者提出了分段考虑水泥土变形过程的观点,通过对水泥土损伤试验结果的分析,明确了水泥土损伤变量的变化规律,探讨了水泥土的损伤机制,结合试验中获得的应力—应变曲线,建立了水泥土损伤模型,并根据试验数据确定了水泥土的相关材料参数和损伤变量,得出了水泥土的分段弹塑性损伤本构关系,说明将弹塑性的损伤理论引入到水泥土的工程力学特性领域是可行的、有意义的。再次,明确了H2SO4侵蚀环境中的水泥土的化学侵蚀特点,定义了水泥土的化学侵蚀因子,结合试验数据,并且根据化学动力学的知识,建立了H2SO4侵蚀环境中的水泥土早期强度的化学预测模型,通过与试验结果的对比,证明本文所建立的化学预测模型的准确性与合理性,为H2SO4侵蚀环境中的水泥土强度的预测提供了依据,该模型的建立,把化学侵蚀与力学强度有效地结合起来,根据文中定义的化学侵蚀因子,使我们在宏观立场上清楚地了解了水泥土内部物质和水化产物与H2SO4消耗量之间的关系,对水泥土与H2SO4的反应有了定量的认识;同时,只要掌握不同侵蚀环境中的水泥土力学参数和侵链介质的消耗速率,应用模型可对相应的侵蚀环境中的水泥土早期强度进行预测,为水泥土桩尤其是大体积水泥土在各种侵蚀环境中的早期强度的预测提供了理论依据。根据侵蚀环境中离子的迁移特点和化学反应机理,在考虑侵蚀离子在水泥土中的扩散、渗透和化学反应的基础上建立了侵蚀环境中离子迁移的模型,并求得模型的解析表达式,该模型可根据侵蚀离子的不同条件求得其解,为各种侵蚀环境中的离子迁移提供了理论依据。文中还提出了NaOH侵蚀条件下水泥土强度与NaOH浓度和龄期之间关系的强度预测公式,经与试验值比较,证明该公式具有极高的精确性,可以用于NaOH侵蚀环境中水泥土强度的预测。  还原

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【英文摘要】 Cemented soil has been widely used in all kinds of soil improvement because of its lower cost, convinience for construction, and non-vibration, non-noise, non-upheaval of ground during constructions. However, the engineering characteristic of cemented soil usually causes the problems that the soil had been polluted or the cemented soil worked in an erosive environment. The polluted soils or the erosive ions have strong crystal decomposition functions on cemented soil, which has significant effect on the mechanical performance and durability of cemented soil. Consequently, it has great theoretic significances and engineering significances to research the mechanical characteristic changes and the chemical erosion of cemented soil and build the damage constitutional model of cemented soil under the influence of soil pollution and erosive environment.In order to adapt to two pollution instances that may be encountered in engineering, two types of cemented soil were made in lab, one of them...更多 was made from polluted soil (cemented polluted soil for short), the other was made from clean soil (cemented soil for short). The exterior configurations, failure features, unconfmed compressive strengths and stress-strain curves of both cemented polluted soil under standard curing condition and cemented soil soaked in erosive environment were contrasted in details. In consequence, polluted soil has a weaker effect on cemented soil in mechanical characteristic than erosive environment.Firstly, when SO42- content was in a certain range, the compressive strengths of cemented polluted soil didn't become lower but some higher than that of clean cemented soil. With different cations, SO42- has different effects on the strength of cemented polluted soil. Based on the electric scanning microscope test, the reason of SO42- effect on the strength of cemented polluted soil was qualitatively analysed from both microscope aspect and chemical mechanism aspect. Based on a mass of experiment results, the limit concentrations of various irons in polluted soil and erosive environment were explained. In different erosive environment, the modified coefficients of compressive strength of various irons to cemented polluted soil and cemented soil were summerized. The influence degrees of different compounds, different anions and different cations on the strength of cemented soil were sequenced. This provided some useful references for the application, construction and design of polluted soil and cemented soil in erosive environment. Secondly, the stress-strain curves of cemented polluted soil and the cemented soil in erosive environment have significant linear-elastic stage and plastic deformation stage. Plastic deformation closely related to erosion patterns of cemented soil, the kind and the concentration of erosive irons. According to the characteristics of cemented soil elastic-plastic deformation, the author advanced the viewpoint of considering the deformation process of cemented soil in different stages. Based on the analysis of the results of cemented soil damage experiments, the change law of cemented soil damage variable was made clear and the mechanism of cemented soil damage was also discussed. Based on the stress-strain curves, the damage model of cemented soil was established. According to datums of damage experiments, the related material parameters and damage variable were determined and the damage constitutional relationship of cemented soil's sectional elastic-plastic property was obtained. This shows that it is feasible and important to introduce the elastic-plastic damage theory into the mechanical properties of cemented soil engineering.Thirdly, the chemical erosion characteristics of cemented soil in H2SO4 erosive environment were made clear and the chemical erosion factor of cemented soil was defined. According to the experiment datums and chemical kinetics knowledge, the chemical forecasting model of cemented soil early strength in H2SO4 erosive environment was established. By contrasting with the experiment result, its accuracy and reasonableness was proved. This provides the basis for forecasting the mechanical properties of cemented soil strength in H2SO4 erosive environment. With the establishing of this model, chemical erosion has been effectively combined with mechanical strength. According to the chemical erosion factor defined in this article, the relationship of the interior mass and hydrate in the cemented soil and H2SO4 consumption has been made clear, and the reaction of cemented soil and H2SO4 has been quantitatively understood. Meanwhile, when the mechanical parameters of cemented soil and burn rate of erosive medium in various erosive environments have been known, it is feasible to forecast the early strength of the cemented soil in relative erosive environments. This provides theoretical basis for the early strength forecasting of cemented soil pile, especially large volume of cemented soil in various erosive environments.Based on the chemical reaction mechanism and the characteristics of ions migration in various erosive environments, and considering the diffussion, penetration, and reaction of erosive ions in cemented soil, the model of ion migration in erosive environment has been established. And the analytical solution has been obtained. This model can give solutions to different erosive environments, and also provides a theoretical basis for ion migration in various erosive environments. The strength forecasting formulation of the ralationship of cemented soil strength and NaOH concentration and age in NaOH erosive environment has been also proposed. Compared with experimental values, the formulation has been proved to have high accuracy. Therefor, the formulation can be used to forecast cemented soil strength in NaOH erosive environment.  还原水利论文pq/c*wYwAa%|J]

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【中文关键词】 水泥土; 强度; 破裂形态; 侵蚀环境; 污染土; 损伤模型; 迁移模型
!VIu&p9Qk"_0【英文关键词】 cemented soil; strength; failure feature; erosive environment; polluted soil; damage model; migration model水利论文o(n a"Og

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TAG: 白晓红 导师 力学 水泥 赵永强
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