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泵站基础处理是泵站工程的关键,对于含水量大、压缩性高、透水性差、灵敏度高、承载力低的软基面处理,水泥粉体喷射搅拌桩在技术经济方面有着明显优势,本文结合南湖排涝站工程地基处理施工实际,探讨水泥粉体喷射搅拌桩(简称水泥粉喷桩)施工工艺及质量控制。 相似文献
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陈清发 《中国农村水利水电》2005,(9):89-90
潮州供水枢纽工程采用深层水泥搅拌桩对软土地基进行加固处理,取得很好的效果。根据潮州供水枢纽工程深层水泥搅拌桩室内试验结果,对影响水泥搅拌桩抗压强度的诸多因素和渗透系数等进行分析。 相似文献
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梁彬锐 《中国农村水利水电》2008,(5)
场地土以软土为主,工程地质条件较差,须进行地基基础处理.考虑闸址处的实际情况,本工程闸室和翼墙基础均采用水泥搅拌桩基础.如何有效地控制深层水泥搅拌桩的成桩质量,确保软基处理的效果是在工程实践中探索的一个课题. 相似文献
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梁彬锐 《中国农村水利水电》2008,(5):92-93
场地土以软土为主,工程地质条件较差,须进行地基基础处理。考虑闸址处的实际情况,本工程闸室和翼墙基础均采用水泥搅拌桩基础。如何有效地控制深层水泥搅拌桩的成桩质量,确保软基处理的效果是我们在工程实践中探索的一个课题。 相似文献
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水泥搅拌桩成桩原理与条件 总被引:1,自引:1,他引:1
徐雄峰 《中国农村水利水电》2006,(8):116-116
水泥搅拌桩是进行软弱地基处理的一种有效形式。本文讨论水泥深层搅拌桩成桩原理和成桩条件。 相似文献
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水泥搅拌桩是通过软土与水泥的强制搅拌形成的水泥土加固体,这种加固体可与天然地基组成复合地基,能相互套接形成防渗体,能提高地基的承载能力。介绍了水泥搅拌桩复合地基在广东省四会市马房水利枢纽工程中的施工方案及特点。 相似文献
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张开成 《中国农村水利水电》2005,(8):89-90
1施工概况 我国于20世纪70年代末致力于深层水泥搅拌桩技术的开发并应用于工程实践中,至今已形成喷浆和喷粉两大系列的深层搅拌施工技术。深层搅拌桩现已大量应用于珠江三角洲等沿海软土地基中。 相似文献
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在水利工程中,软土地基双向水泥搅拌桩技术应用广泛,它特别适合在一些淤泥质土分布广泛且厚度较大的区域展开施工,以克服软土高压缩性、低强度、工程力学较差的缺点。文章以某水利工程案例为背景,简要介绍了软土地基双向水泥搅拌桩的技术设计及施工控制要点。 相似文献
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《Journal of Agricultural Engineering Research》1998,69(3):249-254
A model to represent the discolouration of dried powder of carrots as a function of temperature was developed. Two types of carrots, Asian and European, containing large amount of lycopene and β-carotene, respectively, were tested. The dried powder was stored under an atmosphere with O2and at three different temperatures, 5,20 and 35°C. The surface colour of the powder was monitored during storage by a Hunter colour ratioa/b. In the proposed model, the rate of oxidation was assumed to be represented by the product of the fraction of concentration of oxidized pigment at arbitrary time and a specific rate of oxidation of pigment. The rate parameters in the proposed model were calculated by fitting the experimental data with smooth curves by trial and error at the end of the induction period but before discolouration took place. The frequency constant and activation energy, expressing the temperature dependence of the rate parameters, were expressed by the Arrhenius relation. The simulation results of a Hunter colour ratioa/bof dried powder at 25°C showed good agreement with the experimental data, suggesting that the proposed model was effective for the prediction of discolouration of dried powder of both types of carrot. The use of the induction period in the manner described may enable the shelf life of dried powder to be predicted. 相似文献
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感官检验棉花的品级,这是农村常见的一种检测手段.它的一个主要特点就是存在不确定性.这是由于检验员的品级检验水平存在一定的差异,其中有很多因素制约着检验的结果.文章对影响感官检验结果的因素进行了系统的分析. 相似文献
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The fractional outflow rate of water from the rumen, measured as the rate of disappearance of the chromium complex of ethylenediamine tetra-acetic acid, was related to a number of dietary factors. A multiple regression equation was derived which expressed fractional outflow rate as a function of the intakes of dry matter, ash, acid-detergent fibre and crude protein.The data analysed consisted of 243 observations for sheep on 59 diets, including forage, concentrate and mixed diets. The ranges covered by the data were: fractional outflow rate 0.7–3.6 day?1; dry matter intake 560–1400g/day; ash 4–30%, acid-detergent fibre 7–41%, crude protein 5–26 % of dry matter; there were no observations for sheep of less than 34 kg liveweight.The equation accounted for 56·3 % of the total variance. Between-sheep variance could not be calculated for the whole of the data but was undoubtedly substantial since, for a sixth of the data, it was known to account for 38 % of the total variance. 相似文献
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从灾害经济学的角度探讨了城镇供水优化调度的必要性和可能性,认为在缺水不可避免的情况下,对供水进行优化调度可以减小缺水带来的损失,产生较好的减灾效益,特别是可以大大减小严重干旱的灾害效应。并根据水资源的特性,提出了缺水损失的计算模式以及优化调度的原则和方法。 相似文献