共查询到20条相似文献，搜索用时 187 毫秒
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阐述长短桩复合地基的设计思想,介绍长短桩复合地基承载力和变形的计算方法,记述长短桩复合地基的变形计算,并对设计中有关设计参数的确定进行分析. 相似文献
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根据建筑地基处理技术规范中混凝土桩复合地基设计计算表达式,对带帽桩复合地基和无帽桩复合地基的承载力、总沉降量进行了分析对比,并以此为依据对福永高速公路南屿互通带帽混凝土桩复合地基沉降控制的优化设计思路进行了分析. 相似文献
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姜元懂 《商情·科学教育家》2013,(25)
秦沈客运专线A-14标段东部试验段DK271 +487.27～+520段为松软地基.设计要求采用桩长15.0米,桩间距1.0米,桩径0.5米,梅花型布置的碎石桩加固松软地基.成桩工艺要求为重复压拔管法.成桩后需进行重型动力触探和复合地基静载荷试验,要求复合地基承载力不小于150Kpa,桩身密实度大于中密状态(N63.5≥10). 相似文献
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利用有限元分析软件ANSYS软件,考虑上部结构的反馈作用,建立5×5刚性桩复合地基三雏群桩进行动力特性分析,采用分解反应谱法对刚性桩复合地基的地震响应作了分析,得出了上部结构-基础-复合地基在不同等级地震激励下结构位移及内力的数值大小和分布规律,对刚性桩复合地基抗震设计具有一定的参考价值. 相似文献
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目的:工程规范中采取保守设计方法导致含有埋深的复合地基的承载力被严重低估。本文基于设计表格的方法展示水泥搅拌站复合地基的承载力系数(N_c、N_q和N_γ),分析埋深存在时的3种破坏模式,探讨承载力系数N_q和破坏模式随着各类因素(桩长、置换率和埋置深度)变化的原因。创新点:1.确定简化的均质化水泥搅拌桩加固地基模型;2.建立非连续布局优化法(DLO)模型,计算工程实用设计表格;3.分析极限承载力系数N_q、破坏模式和各类影响因素的内在关联。方法:1.通过等效强度法确定合理的均质化数值计算模型,并与群桩模型和前人研究进行对比验证(图4和表1);2.通过极限分析上限解结合非连续布局优化法,进行大量计算,建立极限承载力系数的设计表格(图6~8)。结论:1.对于无埋深工况,承载力系数N_c随着置换率的增长而增大,直到某一临界值,此时发生实体基础破坏。2.在置换率较低时,承载力系数N_γ随着置换率的增长而减小,因为此时加固区内的等效内摩擦角减小。3.埋置深度对承载力和破坏模式产生复杂影响;当破坏模式从实体基础转化为复合型破坏时,N_q增长;随着桩长进一步增加,破坏面通过加固区内部时,N_q在减小之后保持不变。 相似文献
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长短桩复合地基的理论与实践 总被引：1，自引：0，他引：1
长短桩复合地基可以充分发挥地基土的潜能,有效提高地基承载力和减少地基沉降。长短桩复合地基的形成条件是确保长桩、短桩和桩间土在建筑物工作阶段能同时直接承担荷载;长短桩复合地基特别适用于压缩土层较厚的地基。长短桩复合地基承载力特征值fspk可采用下式计算：fspk=m1Ra1/＋β2m2Ra2/Ap2＋β2（1-m1-m2）fsko,提出了长短桩复合地基总沉降量的计算方法和优化设计的方法。最后给出了长短桩复合地基的一个应用实例。 相似文献
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强夯法处理湿陷性黄土地基具有施工简便、快速有效、造价经济、质量可靠的优点.它对增强地基密实度、消除土层湿陷性、降低土层压缩性和提高地基承载力效果显著.针对某仓库地基强夯工程,对强夯加固效果进行分析,采用文中建议的公式计算夯后地基承载力,理论计算值与实测值基本吻合. 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献