超深旋喷桩在地基加固中的应用

发布时间：2018-07-29 20:02

【摘要】：中国经济的迅猛发展,城市中的建筑高度在不断地更新,对基础的承载力和不良地基处理的要求也提升到了新的高度。旋喷桩技术是一种新型的地基加固处理方法,在实际工程中得到了广泛的应用。它具有施工操作方便、抗压强度高、经济效益好、材料省等优点。然而在超深地质条件下,或者地质比较复杂的情况下,运用旋喷桩技术还存在很大的难度。其实践范围比较窄,其理论研究还很不足。本文根据广州某厂房塌陷后修整加固其地基为背景,采用超深旋喷桩加固地基的现场试验和PFC离散元模拟相结合的方法,研究超深旋喷桩在复杂工程地质条件下的工程应用。主要研究成果如下:1)结合某深基坑工程中超深旋喷桩的工程实例,通过改造旋喷桩的桩机和钻头,解决了钻机在卵石层不能下钻的问题。2)钻孔取芯结合深井抽水试验的检测方法对检测超深旋喷桩止水帷幕是相当有效和实用的。3)通过PFC离散元数值模拟得出,喷浆压力、不同土层与喷浆时间对土体的劈裂范围及浆液分布情况有着直接的影响。注浆压力越大,土体劈裂范围和浆液的扩散范围就越大;土体颗粒的级配及孔隙率直接影响着土体劈裂缝隙及浆液分布情况;注浆时间的增加,浆液分布范围也相应的变大。本文的研究成果对于旋喷桩技术在复杂地质条件下的应用提供了坚实的理论基础,具有实践指导意义。
[Abstract]:With the rapid development of China's economy, the height of buildings in the city is constantly updated, and the bearing capacity of the foundation and the requirements for the treatment of bad foundation have also been raised to a new height. The rotary jet pile technology is a new method of foundation reinforcement, which has been widely used in practical engineering. It has convenient construction operation, high compressive strength, and high compressive strength. However, under the conditions of super deep geological conditions and complicated geological conditions, it is difficult to use the technology of rotary jet pile. The practical scope is narrow and its theoretical research is still very insufficient. This paper is based on the foundation of the consolidation and reinforcement of a factory building after the collapse of a factory in Guangzhou, and the foundation of super deep rotary jet pile is used to reinforce the foundation. The field test and PFC discrete element simulation are combined to study the engineering application of the ultra deep rotary jet pile under the complex engineering geological conditions. The main research results are as follows: 1) combining with the engineering example of the ultra deep rotary jet pile in a deep foundation pit, the problem that the drilling machine can not be drills in the pebble layer is solved by reforming the pile machine and bit of the rotary jet pile.) The testing method of drilling core combined with deep well pumping test is a very effective and practical.3 for detecting the water stop curtain of ultra deep rotary jet pile. Through the numerical simulation of PFC discrete element, the grouting pressure, the different soil layer and the spraying time have a direct influence on the splitting range of soil and the distribution of the slurry. The greater the grouting pressure, the splitting range of the soil The larger the diffusion range of the slurry and the size of the slurry, the gradation and porosity of the soil particles directly affect the distribution of the cracks in the soil and the distribution of the slurry, and the size distribution of the slurry increases correspondingly. The research results of this paper provide a solid theoretical basis for the application of the rotary jet technology under the complex geological conditions. Guiding significance.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753.8

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