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Underwater Explosion Treatment of Marine Soft Foundation 总被引:11,自引:0,他引:11
Zheng Zhemin Yang Zhengsheng Jin Liu
Professor Academician of Chinese Academy of Sciences Director of Mechanics Institute of Chinese Academy of Sciences Beijing
Professor Mechanics Institute of Chinese Academy of Sciences Beijing Senior Engineer Lianyungang Harbor Construction Command Post Lianyungang Province of Jiangsu 《中国海洋工程》1991,(2)
The consolidation of soft foundation is a problem that commonly appears in harbor construction engineering on muddy coast. Introduced in this paper is the experimental study on underwater explosion treatment of soft foundation, including the regulations of explosion hollow development and medium movement, the law of similarity of densification and settlement of filled stone mass by shock wave pressure and explosion energy and their construction technologies, etc. A number of projects have been completed by applying this new technique, and the technique itself has been proved practicable. 相似文献
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姑合工程实践,介绍快速“高真空击密法”软地基处理方法的施工原理、施工工艺及质量控制等,并简单阐述“高真空击密法”在进行软地基处理中的优点。 相似文献
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通过综合分析工程建设区域的自然条件和地质条件,对比选取塑料排水板排水固结法加固护岸工程的水下软土地基。系统介绍了塑料排水板的加固机理、排水板的选型、施工工艺、质量控制要点。经过对处理后地基的沉降、位移的长期跟踪观测,结果表明:采用排水板排水加固水下软土地基,取得了理想效果,具有一定的工程指导意义。 相似文献
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文中介绍了软基快速建造码头的方法与技术。在含水量高、孔隙比大、渗透系数小、埋藏深厚、承载力与抗剪强度低、灵敏度高的软弱地基上,采用软基快速筑堤方法和鲎式硬壳堤坝技术,22 d时间完成码头建造,投入使用1 a多时间,一直未出现裂缝等问题。 相似文献
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不同软基处理方法适用性比较 总被引:8,自引:0,他引:8
总结分析了国内外现有的软土地基处理的各种方法。通过对采用不同方法进行软基处理的工程实例处理效果的定量对比,发现不同软基处理方法的适用性差异很大,多数工程中仅用一种方法很难达到设计要求,而两种或多种方法联合则可望取得更好的效果。 相似文献
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1 .IntroductionTheZhapuPortissituatedonthenorthbankoftheHangzhouBay ,nearZhapuTowninPinghuCity ,Zhejiangprovince .Asthefirststepofconstruction ,reclamationwasaccomplishedinthehinter landoftheharbor.Theborderdikeofafulllengthof 1 2 71mislocatedinthetidalregionoftheHangzhouBay .ThepreliminarydesignofthisprojectwascompletedinJune 1 986 ,anditsconstructionbeganinJuly 1 986 ,andwascompletedinMarch 1 991 .TheseadikewasbuiltontheQ4marinedepositofsaturatedsoftclaywithathicknessofabout2 7mandgeo… 相似文献
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Pseudo-Static Elasto-Plastic Cyclic Creep Model and Cyclic Stability of Offshore Soft Foundation 总被引:2,自引:0,他引:2
The accumulative shear deformation of soft clays under cyclic loads is considered as pseudo-staticcreep.A pseudo-static elasto-plastic cyclic creep model is developed based on the visco-elasto-plastic theory.Theparameters in the model are determined by cyclic triaxial soil tests.A method for analyzing the stability of offshoresoft foundation under wave loads is given by combining the model with pseudo-static creep analysis.An exampleis analyzed by the method.The results show that the horizontal and vertical stability of foundations under waveloads can be analyzed by it and the analytical results are qualitatively consistent with the observed failure modes ofshallow foundations. 相似文献
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Qiu Changlin Yan Shuwang
Ph. D. Student Dept. of Hydraulic Engrg. Tianjin University Tianjin Professor Dept. of Hydraulic Engrg. Tianjin University Tianjin 《中国海洋工程》1997,(1)
Strengthening soft foundation by vacuum loading from lower position is a new method of ac-celerating the consolidation of dredger fill.This paper presents the mechanism of soft foundation strength-ening by vacuum loading from lower position and evaluates the effectiveness of this method under variousboundary conditions by means of finite element method(FEM)on the basis of Biot's consolidationtheory. 相似文献
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The bucket foundation is a new type of foundation for offshore application to intermediate-depth waters. It has advantages over conventional ones. However, there is no consensus in the analysis and design of this type of foundation. In this paper, the lateral bearing capacity and the failure mechanism of multi-bucket foundations are studied with different connection stiffness and bucket spacing by use of a three-dimensional finite element method. Based on the numerical analysis results, a limit analysis method of plasticity for evaluating the lateral bearing capacity of large-spacing multi-bucket foundation with rigid connection in soft ground is proposed. This method provides a simple procedure that gives results comparable to those from the finite element analyses. 相似文献
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为了有效控制软土地基上海岸建筑物的工后沉降和不均匀沉降,各种软基处理方法在海岸工程建设中得到了越来越广泛的应用。结合海岸工程软土地基处理实例,对振冲挤密法的地基加固机理、加固砂类土地基时的设计参数、施工及加固后地基的检测等进行了探讨,结果表明,振冲挤密处理砂类土地基是行之有效的,并对今后的施工和设计提出了一些参考性建议。 相似文献
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重力式码头基床爆破夯在深基床的情况下,具有更明显的优势。结合广州港南沙港区二期工程深基床爆夯的应用,对爆夯法加固深基床进行了效果分析,并提出需要探讨的几个问题。 相似文献
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目前在防波堤设计和施工中,较少考虑软粘土的蠕变特性对软土地基长期变形的影响.为准确预测斜坡堤软土地基的变形水平,研究采用Plaxis二维有限元程序,利用不考虑蠕变的摩尔-库仑模型和能反映土体时间效应的软土蠕变模型,模拟某斜坡堤地基软土层施工期和工后的地基变形过程,对比分析了两种不同模型的计算结果,表明由软土蠕变模型得到... 相似文献
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某港口堆场地基上部5.0m系吹填而成,地表下18m范围均属软土,经真空预压初级加固后地基承载力仅在80—90kPa,局部区域上部淤泥土层土性指标较差,含水量大于50%,地基承载力不足60kPa。为了使地基达到230kPa的承载要求,设计采用深层搅拌法加固超软弱地基。通过现场成桩工艺试验和检测表明,桩身水泥土强度在90d龄期时大于1.80MPa,单桩承载力标准值大于150kN,以φ600桩径、桩长13.5m、置换率为0.308和φ500桩径、桩长13.5m、置换率为0.267两种方案布置的复合地基承载力标准值均超过了230kPa的设计要求。试验结果表明,深层搅拌法在港口超软弱地基土应用只要施工工艺适当,完全可以使地基承载力提高2—3.5倍以土,从而节省大量的工程投资。 相似文献