大型石化地基振冲碎石桩处理现场试验研究

发布时间：2018-01-03 02:02

本文关键词：大型石化地基振冲碎石桩处理现场试验研究　出处：《岩土力学》2015年S1期 　论文类型：期刊论文

【摘要】：针对大型炼厂工程地基处理的复杂性,开展了振冲碎石桩的现场试验。利用静力触探试验检测桩体密实度和判别饱和砂土液化。基于旁压试验、标准贯入试验和重型动力触探试验结果,分析了施工前后地基承载力和土体工程特性变化情况。以单桩和复合地基载荷试验结果验证了桩间土、单桩及复合地基的承载性能。研究结果表明,振冲碎石桩对桩长范围的砂土具有明显的挤密效应,工程特性和场地的均匀性在处理后有了明显改善和提高,有效地消除了桩长范围内砂土的液化可能性。静载荷试验结果表明,振冲碎石桩复合地基承载力能达到设计要求;振冲碎石桩对砂土层下卧黏性土层的加固作用不明显,部分深度范围内土体强度降低;当地面以下10 m内不存在厚度大于5 m的软土夹层时,较薄的软土夹层状对挤密加固其余深度的砂土未产生明显影响,对地基承载力影响亦较小。
[Abstract]:In view of the complexity of foundation treatment in large refinery engineering, the field test of vibrating-impact gravel pile is carried out. The static penetration test is used to detect the compactness of pile and to distinguish the liquefaction of saturated sand. The results of standard penetration test and heavy-duty dynamic penetration test are used to analyze the variation of foundation bearing capacity and soil engineering characteristics before and after construction. The load test results of single pile and composite foundation are used to verify the soil between piles. The results show that the vibration-impact gravel pile has obvious compaction effect on the sand in the long range of pile, and the engineering characteristics and the uniformity of the site have been obviously improved and improved after treatment. The results of static load test show that the bearing capacity of vibrating-impact gravel pile composite foundation can meet the design requirements. The effect of vibro-impact gravel pile on the consolidation of soil layer is not obvious, but the strength of soil is decreased in some depth range. When there is no soft soil intercalation with thickness greater than 5 m within 10 m below the ground, the thin soft soil intercalation has no obvious influence on the other depth of sand compaction and has little effect on the bearing capacity of the foundation.
【作者单位】：中国石油天然气华东勘察设计研究院岩土工程处;慕尼黑工业大学土木工程与测量学院;中铁第四勘察设计院集团有限公司;
【基金】：中国石油工程建设公司科学研究与技术开发项目(No.CPECC2011KJ22)
【分类号】：TU472
【正文快照】： 1引言随着我国能源需求的进一步加大,越来越多的沿海地区及城市兴建了石化工程,建造规模也越来越大,随之产生了一个问题,如何对软土软弱地基进行处理,从而达到控制地基变形及油罐沉降的目的,成为了石化工程地基与基础设计中的重要研究内容。振冲碎石桩作为软弱地基处理的一个

【参考文献】