共查询到19条相似文献,搜索用时 156 毫秒
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由于各种原因,目前许多水库都存在不同程度的病害,而通过水泥与红土深层搅拌桩施工的方法,可以有效的减少病险和水库水量渗透损失。当土容重测定后,水灰比的选定,水泥掺入量的选定可通过现场打桩试验确定。试验桩开挖后通过检查桩的连续性、均匀性、搭接状况、最小墙厚度,取样通过室内试验检查不同水灰比时的抗压、抗渗值,水泥掺入量是否满足技术要求等。 相似文献
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本文通过对深层搅拌水泥桩的水泥掺入比进行室内配比试验分析,并通过现场静载荷试验检验,进而研究水泥掺入比对单桩承载力的影响,优化配比,从而在实际工程中选择经济合理的水泥掺入比. 相似文献
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对在粘土中掺入一定量水泥和粘土中掺入一定量石灰的试件,进行了测定试验,研究了不同掺量石灰、水泥对混合材料的抗压、抗折强度、导热系数的影响;试验表明,在粘土中石灰掺入量应控制在5%左右,混合材料的含水率增大,导热系数增大;水泥掺入量应在7%左右。 相似文献
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水泥土搅拌桩作为基坑止水帷幕已经得到了广泛应用,为了更深入的理解作为止水帷幕的水泥土的工程特性,通过对不同水泥掺入量的水泥土无侧限抗压强度和渗透系数的室内试验研究,利用CBR-1承载比试验仪和TSS-2柔性壁三轴渗透仪对水泥土进行了无侧限抗压强度和渗透试验,分析了养护龄期及水泥掺入量对水泥土的无侧限抗压强度和渗透系数的影响。试验结果表明,水泥土的无侧限抗压强度随养护龄期和水泥掺入量的增大而增大,并通过曲线的拟合,得出了无侧限抗压强度的预测公式;渗透系数随养护龄期和水泥掺入量的增大而减少,通过数据对比得出28天之后水泥土渗透系数主要是受水泥掺入量的影响。 相似文献
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有机质含量对水泥土强度的影响及对策 总被引:3,自引:0,他引:3
采用有机质含量比较高的盐城泻湖相软土进行了大量的水泥土加固室内试验,并对试验结果进行了分析,得到了强度随龄期增长的公式,并探讨了有机质对强度的不利影响,提出了抵抗有机质含量对水泥土强度影响的对策。 相似文献
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以某工程的软土为原料,进行了一系列水泥土的物理、强度试验,分析了含水量、水泥用量和龄期对水泥土强度的影响,提出了水泥加固该种软土的最小水泥用量值,该结论对我国其他地区软土的加固具有重要的借鉴意义。 相似文献
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《Soils and Foundations》2014,54(2):209-224
Although extensive research has been conducted on the mechanical behaviour of Portland cement-treated soft clays, there has been less emphasis on the correlation of the observed behaviour with clay mineralogy. In this study, experimental results from the authors have been combined with the data found in the literature to investigate the effect of parameters such as curing time, cement content, moisture content, liquidity index, and mineralogy on the mechanical properties of cement-treated clays. The findings show that undrained shear strength and sensitivity of cemented clays still continue to increase after relatively long curing times; expressions are proposed to predict the strength and sensitivity with time. This parametric study also indicates the relative importance of the activity of the soil, as well as the water–cement ratio, to the mechanical properties of cementitious admixtures. Two new empirical parameters are introduced herein. Based on the results of unconfined compression, undrained triaxial, and oedometer tests on cement-enhanced clays, expressions that use these parameters to predict undrained shear strength, yield stress, and the slope of the compression line are proposed. The observed variations in the mechanical behaviour with respect to mineralogy and the important effect of curing time are explained in terms of the pozzolanic reactions. The possible limitations of applying Abrams׳ law to cement–admixed clays are also discussed. 相似文献
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通过模拟试验的方法探讨了在不同H2SO4侵蚀环境下不同龄期(0~28d)的水泥土表观变化和抗压强度衰减规律,得出了水泥土表面腐蚀程度随着侵蚀时间的增长和H2SO4介质浓度的增大而增加,水泥土抗压强度随H2SO4浓度的增大而减小;分析了H2SO4溶液的pH值和SO2-4浓度随时间的变化关系,得出随着时间的增长侵蚀溶液的pH值增大,SO2-4浓度则呈下降趋势.研究认为:受H2SO4侵蚀的水泥土强度改变与环境溶液的pH值、SO2-4浓度和时间密切相关.在此基础上建立了考虑H2SO4侵蚀环境下pH值、SO2-4浓度、时间多因素的多元线性回归的水泥土强度Q-T,pH,S模型,经对比预测值与实测值,证明两者比较接近,差值说明模型的具有一定的可行性,可供工程设计参考. 相似文献
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Effect of fiber-reinforcement on the strength of cemented soils 总被引:1,自引:0,他引:1
This study aims to verify the differences in the strength of an artificially cemented sandy soil with and without fiber reinforcement. The controlling parameters evaluated were the amount of cement, porosity, moisture content, and voids/cement ratio. A series of unconfined compression tests and suction measures were carried out. The results show that fiber insertion in the cemented soil, for the whole range of cement studied, causes an increase in unconfined compression strength. The UCS increased linearly with the amount of cement and reduced with the increase in porosity (η) for both the fiber-reinforced and unreinforced specimens. A power function fits well as the relation between unconfined compressive strength (UCS) and porosity (η). Finally, it was shown that the voids/cement ratio is a good parameter in the evaluation of the unconfined compressive strength of the fiber-reinforced and unreinforced cemented soil studied. 相似文献
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现场施工过程中,往往需要对水泥固化土的无侧限抗压强度进行快速检测。针对目前水泥固化黏土无侧限抗压强度检测中存在的操作不简便、试验时间长、测试费用高等缺点,提出通过水泥土硬度估计强度的方法,对现场水泥土强度进行快速检测。本文以上海地区黏性土为研究对象,对上海地区水泥固化黏土强度与硬度的相关性进行了试验研究;探讨了加固土的硬度与养护时间、水泥掺量以及强度与硬度之间的关系。试验结果表明:上海黏土水泥土强度和硬度呈正比相关,对数坐标下的强度和硬度有着形如lnqu=ap+b的线性关系。养护初期,硬度增长速度大于水泥土强度增长速度。养护后期,强度增速大于硬度增速。 相似文献