强夯法联合井点降水在处理软土地基上的应用与研究

发布时间：2019-06-09 19:49

【摘要】：在全球人口的急剧增加，人们可利用的良好土体资源越来越稀少的大形势下。伴随着科技的进步，填海造陆以及在软土地基上进行工程建设依然成为当下发展的潮流。针对软土地基土质工程状况的特殊性和复杂性这一问题，人们对地基处理的技术开始了更高层次更全面的研究和创新。近年来，众多新工艺新方法新理论，得到了借鉴和引进。其中包括，排水固结法、振密挤密法、置换及拌入法、加筋法等。本文中提到的强夯联合井点降水法因其具有施工工期短和经济效益好的优点，得到了广泛的应用。以前的强夯处理法在处理吹填软土和淤泥质软土时，由于高能量强夯作用对土体中的超孔隙水压力造成短时间的增大。而超孔隙水压因其没有良好的排水通道，超孔压消散的缓慢，导致了地基出现“橡皮土”的现象。本文通过青岛市经济技术开发区吹填软土地基的工程处理实例，统计了地基处理前后土体的水平和竖向变形，超孔水压的变化趋势、施工工艺的技术参数以及土体的力学性能的时间效应数据。分析了适合软土地基这一工程状况的加固机理，决定了将强夯和井点降水联合这一新型技术用来加速土体的固结和超孔隙水压的消散。文章最后，通过数值模拟软件FLAC-3D来计算强夯作用下软土地基的土体变形和应力分布等数据。对比现场试验的数据，可以进一步的证明强夯联合井点降水法处理软土地基的可行性。
[Abstract]:With the rapid increase of global population, the good soil resources available to people are becoming more and more scarce. With the progress of science and technology, reclamation and land construction and engineering construction on soft soil foundation have still become the current trend of development. In view of the particularity and complexity of soil quality engineering in soft soil foundation, the technology of foundation treatment has begun to be studied and innovated at a higher level and comprehensively. In recent years, many new technology, new methods and new theories have been used for reference and introduced. Among them, drainage consolidation method, vibration compaction method, replacement and mixing method, reinforcement method and so on. The dynamic compaction combined well point precipitation method mentioned in this paper has been widely used because of its short construction period and good economic benefits. In the previous dynamic compaction treatment, the excess pore water pressure in the soil increased for a short time due to the high energy dynamic compaction in the treatment of blown soft soil and silty soft soil. However, due to the lack of good drainage channel and the slow dissipation of superpore pressure, the phenomenon of "rubber soil" appears in the foundation. Through the engineering treatment example of blowing fill soft soil foundation in Qingdao Economic and technological Development Zone, the horizontal and vertical deformation of soil before and after foundation treatment, and the changing trend of super hole water pressure are counted in this paper. The technical parameters of construction technology and the time effect data of mechanical properties of soil. The reinforcement mechanism suitable for the engineering condition of soft soil foundation is analyzed, and it is determined that the new technique of combining dynamic compaction with well point dewatering can be used to accelerate the consolidation of soil and the dissipation of excess pore water pressure. Finally, the deformation and stress distribution of soft soil foundation under dynamic compaction are calculated by numerical simulation software FLAC-3D. Compared with the data of field test, the feasibility of treating soft soil foundation by dynamic compaction combined with well point precipitation method can be further proved.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU472.31;TU463

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