强夯加固粉煤灰及下伏的淤泥质软土地基试验研究

发布时间：2018-03-04 10:02

本文选题：粉煤灰　切入点：淤泥质软土　出处：《水运工程》2015年11期 　论文类型：期刊论文

【摘要】：以南京扬子石化储油罐地基处理工程为背景,对粉煤灰及下伏的淤泥质软土地基进行了强夯试验研究。试验中首先对夯坑周围地表沉降以及孔隙水压力进行了检测,然后通过室内土工、载荷、标准贯入、静力触探等试验对强夯加固效果进行了检验。试验表明:强夯采用初始低能量夯击,逐步增加夯击能量和夯击遍数的施工工艺,辅以设置碎石垫层和竖向塑料排水板以及夯点采用梅花形布置的方法,效果明显,使地基的物理力学性能和抗变形性能显著提高,消除了上部粉煤灰层的液化问题,整体加固效果很好,夯后各项指标完全达到或超过预期值;同时通过对试验数据的分析研究,获得强夯法加固该类地基土的最佳强夯参数和施工工艺。
[Abstract]:Based on the foundation treatment project of Nanjing Yangzi Petrochemical Oil Storage Tank, the dynamic compaction test of fly ash and silt soft soil foundation is carried out. The ground subsidence and pore water pressure around the ramming pit are first tested. Then the effect of dynamic compaction is tested by indoor geotechnical test, load test, standard penetration test, static penetration test and so on. The results show that the dynamic compaction adopts the initial low energy ramming, and gradually increases the tamping energy and the number of times of tamping. With the method of setting gravel cushion, vertical plastic drainage board and tamping point, the effect is obvious, the physical and mechanical properties and deformation resistance of the foundation are improved significantly, and the liquefaction problem of the upper fly ash layer is eliminated. The overall reinforcement effect is very good, the indexes after compaction completely reach or exceed the expected value, and through the analysis and study of the test data, the best dynamic compaction parameters and construction technology of the dynamic compaction method for this kind of foundation soil are obtained.
【作者单位】：南京工程学院建筑工程学院;
【基金】：住房和城乡建设部科学技术项目(2014-K4-09)
【分类号】：TU447

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