连云港地区水泥土搅拌桩适用性问题探讨   总被引：1，自引：0，他引：1       下载免费PDF全文

葛鹏  靳新民 《江苏地质》2009,33(1):55-59

水泥土搅拌桩地基处理在连云港地区应用广泛。通过工程实例,对于法及湿法的加固效果,从桩身强度及单桩抗压承载力两方面进行分析比较,探讨其适用性,认为,在连云港地区,干法较湿法的加固效果有显著改善,可为类似工程提供参考。  相似文献   

陕北能源化工基地地下水开发利用现状及影响研究   总被引：2，自引：1，他引：1  

何艳芬  刘科伟 《地下水》2009,31(6):29-32

通过分析陕北能源化工基地地下水资源分布、利用现状、利用量的动态变化以及能源化工基地建设对地下水的影响,表明陕北能源化工基地地下水的开发是有限度的;从其供水结构和利用结构来看,工业用水的比例较低;从地下水用水的空间分布来看,与能源资源的空间分布和开发利用的空间分布一致。能源资源的开发利用不仅大量消耗地下水,还会对地下水系统产生破坏作用,同时还对地下水造成严重污染。随着基地建设进程的推进,对水资源的需求日益加强,必须要通过调整用水结构、节水、开源、保护和治污等措施的综合实施,达到地下水资源高效利用和保护的目的,才能实现陕北能源化工基地产业的可持续发展。  相似文献   

地下连续墙在深厚覆盖层地基处理中的适宜性研究     

巨能攀  赵润莲  周喜德 《工程地质学报》2009,17(6)

西南山区河谷广泛分布有深厚覆盖层,它们不但制约水电坝址的选择,同时也给水工建筑的设计和基础处理带来困难,传统沉井方法在深厚覆盖层地基处理中的问题日渐突出.本文从地下连续墙结构构成、受力、施工技术等角度对地下连续墙方案进行了综合研究,在地基岩土体工程地质条件清楚认识的基础上,充分考虑了地下连续墙受力特征,采用三维有限元方法,分析了坝体整体结构及地下连续墙复合挡土墙体系在各种工况下的受力变形特点.结果表明,地下连续墙结构充分调动了墙体和土体的相互作用效应,连续墙体的受力状况可满足建筑物的安全要求,是深厚覆盖层中地基处理的一种有效方法.地下连续墙的变形和内力受到剪力墙的接头形式和接触面强度的控制,在施工过程必须进行有效的控制.  相似文献   

沅江软土工程地质特征     

柳静安 《湖南地质》2001,20(2):114-118

沅江地区的软土，可分为软粉砂质粘土、灰色粘土、淤泥质粘性土、淤泥4个主要类型，其工程地质特性为：天然含水量大于液限，天然孔隙比大于1，压缩系数大，流变性比较显著，承载力标准值较低。工程建设应重视上部结构层与地基基础的共同作用，利用地表硬壳层作为天然浅基或者进行适当的地基处理可以提高地基地的承载力。  相似文献   

振动沉管碎石桩在淤泥质土地基中的应用研究     

周建民 《岩土力学》2003,(Z2)

对地基土进行加固处理的方法有很多种,但是,对于某一种土质,应用那一种方法效果更好,这是地基加固处理成功的关键。本文通过工程实例,详细介绍了振动沉管碎石桩地基处理技术在淤泥质地基土中的具体应用,对地基加固方法进行了比较,提出了该地基处理方法施工注意事项。该工程竣工已两年时间,地基变形稳定,加固效果良好,值得推广。  相似文献   

Boundary differential equation method: simplified dynamic soil stiffnesses for embedded rigid foundations     

Toyoaki Nogami  Harn Shearn Chen 《Soil Dynamics and Earthquake Engineering》2002,22(4):679

With a simplified model and Galerkin's weighted residual procedure, two simple differential equations of dynamic behavior of a bounded rectangular medium are established along the boundaries in the x- and y-direction in the medium. Solutions of these equations yield closed form expressions of soil stiffnesses for various cases of a partially embedded rigid foundation, including the stiffnesses per depth of foundation with rectangular base area and the stifnesses of strip foundation. The developed procedure provides the definition of the weight functions, which are used in Galerkin's method for weighted residual. In addition to these weight functions, their conjugators are also suitable for weight functions. When the soil depth is finite, the original weight functions fail to produce physically meaningful results in some frequency range but the conjugators do not fail at any frequencies. The developed equations to compute soil stiffnesses for embedded foundations are simple yet capable of calculating the responses close to those computed by the much more elaborated finite element method.  相似文献   

Paleoclimatic research: Status and opportunities     

Alan D. Hecht  Roger Barry  Harold Fritts  John Imbrie  John Kutzbach  J.Murray Mitchell  Samuel M. Savin 《Quaternary Research》1979,12(1):6-17

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锚杆静压桩在加固加层危房中的应用研究     

梁合诚 《湖南地质》2002,21(4):294-298

通过武汉市某船厂一危房地基地固工程实例，介绍了锚杆静压桩的应用范围、工作机理和设计施工，总结出锚杆静压桩托换技术的许多优点，籍此说明该技术用于地基加固、托故等方面具有较高的实用价值，是值得推广的地基基础加固处理新方法，以及锚杆势压桩的施工工艺和施工中应注意的问题。  相似文献   

Liquefaction-related building damage in Adapazari during the Turkey earthquake of August 17, 1999     

Murat Mollamahmutoglu  Kamil Kayabali  Turgay Beyaz  Ersin Kolay 《Engineering Geology》2003,67(3-4):297-307

The goal of this paper is to present especially the source and the type of liquefaction-related failures of those buildings which satisfied the structural codes of buildings and practices but experienced settlement, tilting and overturning in Adapazari during the Turkey earthquake of August 17, 1999. In this context, the Adapazari region is first evaluated in terms of geological setting, tectonics, seismicity and liquefaction susceptibility based on in situ and laboratory test data. In addition, the number of stories, types of buildings and their related failures have been mapped accordingly. Furthermore, laboratory model tests are conducted to enforce and/or confirm the type of building's failures with particular reference to their geometrical shape and the number of stories assuming that the models representing buildings satisfy the structural codes of buildings and practices.  相似文献   

A new method for formulation of dynamic responses of shallow foundations in simple general form   总被引：1，自引：0，他引：1  

T. Nogami  A.Al Mahbub  S.H. Chen 《Soil Dynamics and Earthquake Engineering》2005,25(7-10):679-688

A single uniform rectangular area, either homogeneous or heterogeneous, is considered in a soil medium (fundamental cell). Two governing ordinary differential equations in special form are developed for the fundamental cell. The ground supporting a partially embedded foundation is divided into a number of coarse rectangular areas (secondary cells). Each secondary cell is treated as either a single fundamental cell for homogeneous ground or a stack of fundamental cells for inhomogeneous ground. Differential equations for the assembly of secondary cells are formed with those for the fundamental cells. These equations lead to the soil responses in each cell expressed in simple closed form. They also lead to the convenient treatment of soil with appropriate Winkler-type models along the foundation faces and concentrated forces acting at the foundation corners. With them, the foundation responses are finally expressed in simple closed form. The approach is demonstrated for various cases and confirmed to produce the results reasonable enough for civil engineering use.  相似文献