粉喷桩复合地基的工作机理及应用研究

发布时间：2018-04-19 23:41

本文选题：复合地基 + 粉喷桩　；参考：《郑州大学》2013年硕士论文

【摘要】：随着经济的快速发展,我国基础设施建设的规模不断扩大。在工程建设中会经常遇到软弱地基,其承载力满足不了建筑物的建造要求。为了满足建筑物上部结构对地基的承载力以及变形要求,越来越多的工程采用复合地基来进行地基处理。复合地基根据竖向增强体材料的性质可分为散体材料桩复合地基、柔性桩复合地基、刚性桩复合地基三类。粉喷桩复合地基是柔性桩复合地基的一种,它在施工时无噪音、无振动、无土体位移、无废水污染、对环境影响小,而且施工简便、成本低、工期短。该技术在软土地基加固中有着广阔的发展前景。目前在郑州地区,粉喷桩处理软土地基的应用较少,而且该技术在桥梁工程中应用较多,在房建工程中应用较少,其加固机理、破坏机理等方面的理论研究还不完善,在实际工程中也出现过一些问题。本文研究了粉喷桩加固软土地基的作用机理、破坏模式,阐述了粉喷桩复合地基的承载力和沉降计算方法。以郑州市山水生态城住宅小区中粉喷桩处理软土地基为工程实例,计算了单桩以及复合地基的承载力,确定了桩径、桩长、桩间距、面积置换率、固化剂掺入量等设计参数。通过现场单桩竖向静载荷试验和复合地基静载荷试验,验证了有关承载力计算公式的适用性,同时总结阐述了粉喷桩复合地基施工过程中出现的问题以及解决方案,有关结论为郑州地区粉喷桩复合地基的推广应用提供参考。
[Abstract]:With the rapid development of economy, the scale of infrastructure construction in China is expanding. Soft foundation is often encountered in engineering construction, and its bearing capacity can not meet the requirements of building construction. In order to meet the bearing capacity and deformation requirements of the superstructure of the building, more and more projects use composite foundation to treat the foundation. The composite foundation can be divided into three categories according to the properties of vertical reinforcement material: the composite foundation of bulk pile, the composite foundation of flexible pile and the composite foundation of rigid pile. Powder jetting pile composite foundation is a kind of flexible pile composite foundation. It has no noise, no vibration, no soil displacement, no waste water pollution, little influence on environment, simple construction, low cost and short construction period. This technology has a broad development prospect in soft soil foundation reinforcement. At present, in Zhengzhou area, the application of powder jet pile in treating soft soil foundation is few, and the technology is applied more in bridge engineering and less in house construction engineering. The theoretical research on strengthening mechanism and failure mechanism of this technology is not perfect. There have also been some problems in actual projects. In this paper, the mechanism and failure mode of soft soil foundation strengthened by powder jet pile are studied, and the calculation method of bearing capacity and settlement of composite foundation with powder jet pile is expounded. Taking the soft soil foundation treated by powder jet pile in the residential district of Sanshui Ecological City of Zhengzhou as an engineering example, the bearing capacity of single pile and composite foundation is calculated, and the design parameters such as pile diameter, pile length, pile spacing, area replacement rate and the amount of curing agent are determined. Through the vertical static load test of single pile and static load test of composite foundation, the applicability of the calculation formula of bearing capacity is verified, and the problems and solutions in the construction of composite foundation with powder jet pile are summarized. The relevant conclusions provide a reference for the popularization and application of powder-jet pile composite foundation in Zhengzhou area.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU470

【参考文献】