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软土地基上高速公路路堤施工中的监测是保证工程质量和安全的重要手段。文中结合具体工程监测数据,讨论了软土地基路堤施工监测方法、控制标准和注意事项等问题,可以为同类工程提供借鉴。 相似文献
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Dennes T. Bergado Buenaventura C. Patron Jr. Wisit Youyongwatana Jin-Chun Chai Yudhbir 《Structural Safety》1994,13(4):247-266
Six slope failures occurred at random locations along a 10 km embankment adjacent to an irrigation canal. The slope failures occurred when the embankment was raised to 2.05 m above MSL from an average elevation of 1.7 m above MSL coinciding with the lowering of the canal water level at the end of the dry season. Slope stability analysis was carried out using both conventional and reliability-based procedures. The spatial variability of undrained strength, the actual variation in embankment geometry, and the varying water level in the canal were considered in the analysis. Both idealized and empirical autocorrelation functions (ACF) of the undrained shear strengths were used in the analyses. An analysis using a factor of safety based on the deterministic soil profile defined by the mean undrained strength resulted in a prediction favoring a reverse failure pattern along the embankment. Using the probability of failure which incorporates spatial variation of undrained strength and uncertainties associated with stability prediction yielded a result conforming to the actual failure pattern along the embankment. The use of empirical autocorrelation function (ACF) seems to confirm and explain better the occurrence of the failure zones than utilizing the idealized ACF. 相似文献
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本文着重介绍了近年来在国内高等级公路建设中逐步推广应用、发展起来的道路深厚软土复合地基处理的几种新方法、新工艺的有关问题,以期引起相关工程技术人员的探讨与试验研究并运用于本地区道路软基处理方案的优化设计。 相似文献
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Edward W. Brand Prasop Krasaesin 《Bulletin of Engineering Geology and the Environment》1970,1(1):53-64
Reported here are the results of an investigation into the failure of a low road embankment founded in soft Bangkok clay and flanked by retaining walls. A rotational slip appears to have occurred, the factor of safety of the embankment under its own weight being only about 1.2. While traffic loading was certainly a contributory factor, failure was probably caused by the excess pore pressures generated in the soft clay when long concrete piles were driven adjacent to the retaining wall as a remedial measure. 相似文献
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从柔性基层路面的结构特点、材料选择、施工要求等方面对柔性基层路面设计理论进行了详细的阐述,指出各地应根据具体的气候、交通、材料、经济等工程具体条件优选沥青路面结构和结构组合。 相似文献
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软土地基路堤填筑沉降监测 总被引:1,自引:0,他引:1
针对软土地基路堤施工监测,详细介绍了沉降监测标准、监测仪标的制作、埋设程序、观测方法、仪标保护等问题,以保证监测数据的可靠,为确定路面铺筑时间提供准确的数据。 相似文献
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结合施工实例,介绍了软质地基上路基施工方法的适用范围及优缺点,阐述了软土地基的施工要点,对路基宽度及坡率的控制进行了探讨,对几种施工方法进行了经济效果分析,最后得出几种施工方法是软质地基路堤、边坡施工性价比较高的施工方法。 相似文献
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介绍了软土地基的特性,分析了软土地基上堤防失稳破坏的原因,就堤防工程中常用的软土地基处理方法进行了详细阐述,并提出了软土堤基施工注意事项,以解决好堤防工程的软土地基问题,从而保证堤防工程的整体质量和安全。 相似文献
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0 前 言 近年来随着天津港建设的迅猛发展,围海造路工程的增多,水力吹填的施工方法被广泛采用。这就使得在天津港港区内,部分地面5~6m以下的深度范围内,分布着吹填上来的海底淤泥质土,道路、集装箱堆场以及各种设施的建设都要在这种地基上进行,吹填土无疑是欠固结土,具有很高的含水率和很低的强度。天津港地区还广泛分布着深厚的软黏土土层,它们的承载力仍然很低。所以在天津港地区进行任何施工以前必须对地基进行加固处理[1~5]。堆载预压法不适于加固这种地基,因为在这种非常软的软黏土地基上堆积几米高压载材料是相当困难的。真空预压法加固软黏土地基是一种行之有效的方法,且其加固时间相对较短,施工成本低[6,7] 相似文献
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Jian-Feng Chen Liang-Yong Li Zhen Zhang Xu Zhang Chao Xu Sathiyamoorthy Rajesh Shou-Zhong Feng 《Geotextiles and Geomembranes》2021,49(1):210-221
Geosynthetic-encased stone column (GESC) has been proven as an effective alternative to reinforcing soft soils. In this paper, a series of centrifuge model tests were conducted to investigate the performance of GESC-supported embankment over soft clay by varying the stiffness of encasement material. The enhancement in the performance of stone columns encased with geosynthetic materials was quantified by comparing the test with ordinary stone columns (OSCs) under identical test conditions. The test results reveal that by encasing stone columns with geosynthetic material, a significant reduction in the ground settlement, relatively faster dissipation of excess pore pressure and enhanced stress concentration ratio was noticed. Moreover, with the increase in the encasement stiffness from 450 kN/m to 3300 kN/m, the stress concentration ratio increased from 4 to 6.5, which signifies the importance of encasement stiffness. In addition, a relatively lower value of soil arching ratio observed for GESCs compared to OSCs indicate the formation of a relatively strong soil arch in the GESC-supported embankment. Interestingly, under embankment loading, GESCs fail by bending while OSCs fail by bulging. The stress reduction method can be used to calculate the settlement of GESC-supported embankment with larger stress reduction factor than that in the OSC-supported embankment. Finally, the limitation of the construction of the embankment at 1 g was addressed. 相似文献
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通过一集中供热工程碎石桩复合地基的处理及再次改善过程,阐明在施工工期短、对变形要求严格的饱和粘性土地基上的建筑物,采用碎石桩复合地基时要慎重对待,最好通过现场试验再决定是否采用。 相似文献
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结合多条高等级公路施工实践,提出了道路软基处理的方法,并针对软基处理设计、施工中的注意事项进行了分析探讨,总结了施工注意事项,以提高软基道路施工质量,可供类似工程施工参考借鉴。 相似文献
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0 引 言软土路基上桥头段沉降较大,形成桥面和路面的高差,产生“桥头跳车”现象。采用过水泥搅拌桩等方法处理桥头段软土路基,但对于深厚软土路基,其加固深度受到限制。低强度桩是指复合地基中的低强度混凝土竖向增强体。与钢筋混凝土桩相比,低强度桩强度和刚度较小,和桩间土共同承担荷载,形成复合地基。浙江台州浃里陈大桥桥头段采用低强度桩对路基进行处理,本文是对现场观测结果的分析。潘纪顺等[1] 、郭忠贤等[2 ] 、池跃君等[3] 对低强度桩复合地基承载性状进行了现场载荷试验研究。化建新等[4 ] 通过试验探讨了垫层土类及厚度对桩土应力比的影响。吴慧明等[5] 通过模型试验,得出了柔性基础下桩土应力比的 相似文献
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对软土地基所具有的孔隙比大、流变比突出、抗剪力弱等特性进行了概述,详细分析了软土地基的表层及深层加固技术,并结合工程实例,探讨了道路施工中软基加固的施工技术要点,以供参考。 相似文献
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基底倾斜的管桩复合地基路堤破坏模式研究 总被引:1,自引:0,他引:1
通过4组土工离心模型试验,研究了山区底面倾斜的软土层管桩复合地基路堤破坏模式。基于底面倾斜的天然软基路堤变形及失稳破坏特点,分析了桩端嵌入硬土层深度和桩顶格梁对于山区管桩复合地基路堤变形及失稳破坏模式的影响。试验结果表明,倾斜软土管桩复合地基上的路堤破坏模式主要有:(1)当桩端嵌入硬土层较深时,复合地基易发生下坡坡脚附近的桩体倾倒和桩间土绕流破坏;(2)桩端嵌入硬土层较浅时,复合地基易发生桩体向一侧的倾覆破坏,并伴随一定的桩间土绕流破坏,桩体倾覆程度显著大于桩端嵌入硬土层较深的情况;(3)当加格梁联系管桩桩顶时,复合地基易发生桩间土的绕流破坏。 相似文献