抗滑桩土拱效应数值模拟研究

发布时间：2018-06-04 12:44

本文选题：土拱 + MIDAS/GTS　；参考：《长安大学》2014年硕士论文

【摘要】：随着近年来我国经济的高速发展，特别是实施西部大开发战略以来，很多工程项目迅速投入建设，，并且，随着城市建设用地的减少，越来越多的工程建设项目将迁往山区这已是必然趋势。而在这些工程项目的建设中不可避免的会遇到很多边坡加固问题。抗滑桩作为一种高效且较经济的抗滑手段，已被很多学者和专家认可并广泛应用于实际工程中。抗滑桩桩土之间存在土拱效应已被广泛认知，但是在很多抗滑桩的设计中依然存在过于保守的问题，这就造成了严重浪费。另外针对地震荷载作用对抗滑桩土拱效应的影响开展的课题研究还相对较少。而我国是一个地震多发国，每次发生地震都对既有的工程造成一定的危害，甚至直接对工程项目造成不可修复的破坏。因此，本文在这样的背景下，以实际工程为依托建立数值模型，分成静力和地震荷载作用下的动力分析模型通过改变下滑推力、抗滑桩桩间距和桩截面宽度来对比分析抗滑桩土拱效应的不同，本文具体工作如下：（1）通过MIDAS/GTS数值软件建立静力数值模型，改变下滑推力、抗滑桩桩间距和桩截面宽度对比分析抗滑桩土拱效应的影响，得出静力作用下在不同条件下对抗滑桩土拱效应的影响规律的结论，并与前人研究成果对比。（2）在静力数值模型的基础上导入一组地震波，形成地震荷载作用下的动力数值模型。分别建立在不同下滑推力、桩间距和桩截面宽度下的动力数值模型，分析不同条件下抗滑桩土拱效应的差异并与静力荷载作用下得出的结果对比，总结在地震荷载作用下抗滑桩在不同下滑推力、不同桩间距、不同桩截面宽度下土拱效应的分布规律。并为以后抗滑桩的抗震设计提供一定的参考。
[Abstract]:With the rapid development of China's economy in recent years, especially since the implementation of the strategy of developing the western region, many engineering projects have been rapidly put into construction, and with the decrease of urban construction land, It is an inevitable trend that more and more engineering projects will be moved to mountainous areas. In the construction of these projects, there will inevitably be many slope reinforcement problems. As an efficient and economical anti-slide method, anti-slide pile has been recognized by many scholars and experts and widely used in practical engineering. The existence of soil arch effect between piles and soils has been widely recognized, but there are still too conservative problems in the design of many anti-slide piles, which has caused serious waste. In addition, the research on the effect of earthquake load on sliding pile and soil arch is relatively few. However, China is an earthquake-prone country. Every earthquake causes certain harm to the existing projects, and even directly causes irreparable damage to the engineering projects. Therefore, in this context, based on the actual engineering, a numerical model is established, which is divided into static and seismic dynamic analysis model by changing the sliding thrust. The difference of soil arch effect between anti-slide pile and pile cross-section is compared and analyzed. The specific work of this paper is as follows: 1) the static numerical model is established by MIDAS/GTS software, and the influence of soil arch effect of anti-slide pile is analyzed by changing the sliding thrust, comparing the pile spacing and the cross-section width of the anti-slide pile. The conclusion is drawn that the influence law of soil arch effect against sliding pile under different conditions under static action, and compared with previous research results. 2) based on the static numerical model, a set of seismic waves are introduced to form a dynamic numerical model under seismic load. The dynamic numerical models under different sliding thrust, pile spacing and pile cross-section width are established, and the difference of soil arch effect of anti-slide pile under different conditions is analyzed and compared with the results obtained under static load. The distribution law of soil arch effect of anti-slide pile under different sliding thrust, different pile spacing and different pile cross-section width is summarized. It also provides some reference for seismic design of anti-slide pile in the future.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU473.1

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