似拱形袋装砂土地基加固承载特性模型试验研究

发布时间：2018-05-07 21:52

本文选题：地基加固 + 不均匀沉降　；参考：《沈阳建筑大学》2014年硕士论文

【摘要】：随着国民经济的飞速发展,科学技术的日益进步,地基处理加固技术也日趋多样化。如何能更安全、经济和快速的对原有地基进行加固处理是近几十年土木工程学科中较为活跃的研究领域。由于地基基础是地下隐蔽工程,基础的沉降或不均匀沉降会作为工程安全性的一个硬性指标。一般而言,地基的沉降或不均匀沉降存在以下两个问题：l、地基的沉降或不均匀沉降对地基原状土的作用机理；2、地基的沉降或不均匀沉降对上部主体结构的影响。地基基础的沉降或不均匀沉降过大都会让上部主体结构产生变形、开裂、倒塌等致命危害。本文在以往传统的地基处理方法的基础上进行创新思维,提出了一种新型的地基处理方法——袋装砂土地基加固处理方法,在该地基处理技术中,核心因素是打破传统思维模式,进行创新思维,该地基处理技术的思维方法是将原有地基土装进设计并制作好的塑料编织袋中,堆放成拱桥的形式,利用了拱桥良好的受力性能,其优点是就地取材,能够有效的节省材料的搬运时间和工程造价,可以大幅度的缩短施工工期。在该地基加固处理方法中,采取的改良办法是在工程原址将地基土装进聚丙烯塑料袋中,然后对开挖的土槽进行机械化夯实,把填装后的编织袋按照设计好的堆放方式整齐的摆放,最后是进行基坑回填。本文是在该设计思路指导下,进行1：10的室内模型试验基础上完成的。在室内模型试验中,我们采用规格为1#,尺寸为45×40×3mmm的塑料自封袋代替设计中的塑料编织袋,试验用从内蒙古赤峰市沙漠的成品细砂来模拟实际工程原状土。在整个试验过程中,依次改变每组试验的砂袋数量和堆放方式,共进行9组实验,保证每组试验进行的时候,顶层砂袋距加载装置的高度是一定的(30mm),在每组试验结束的时候,对砂土槽中的细砂进行全部取出,然后按照固定的填入方式进行砂土回填,尽可能的降低人为的初始扰动。在整个试验过程结束的时候,对9组实验结果进行整合、分析、对比,得出袋装砂土地基加固方法能够很大程度的提高了地基土的承载力,有效的降低了地基基础的沉降和不均匀沉降的结论,希望能为以后的学习和研究提供数据和理论支持。并对该地基处理方法进行前景展望,适用于任何土质地区,尤其是在沿海软弱土和西北砂土地区更能体现袋装砂土地基加固方法的优越性。
[Abstract]:With the rapid development of national economy and the progress of science and technology, foundation treatment and reinforcement technology is becoming more and more diversified. How to strengthen the original foundation more safely, economically and quickly is an active research field in civil engineering discipline in recent decades. Because the foundation is an underground concealed project, the settlement or uneven settlement of the foundation will be regarded as a hard index of engineering safety. Generally speaking, the settlement or uneven settlement of the foundation has the following two problems: l, the action mechanism of the settlement or uneven settlement of the foundation on the foundation undisturbed soil, and the influence of the settlement or uneven settlement of the foundation on the superstructure. The settlement or uneven settlement of the foundation will make the superstructure deform, crack, collapse and other fatal hazards. On the basis of the traditional foundation treatment method, this paper puts forward a new foundation treatment method-bag sand soil foundation strengthening method, in the foundation treatment technology, The key factor is to break the traditional mode of thinking and carry out innovative thinking. The thinking method of the foundation treatment technology is to put the original foundation soil in the plastic woven bag designed and made and pile it up into the form of an arch bridge. Using the good mechanical performance of arch bridge, it has the advantage that the material can be obtained locally, which can save the material handling time and engineering cost effectively, and can shorten the construction period by a large margin. In this method of strengthening the foundation, the improved method is to put the foundation soil in polypropylene plastic bag at the original site of the project, and then mechanize the excavated soil trough. The woven bags after filling are arranged neatly according to the designed stacking method, and the foundation pit backfill is carried out finally. This paper is completed on the basis of 1:10 indoor model test under the guidance of the design idea. In the indoor model test, the plastic self-sealing bag with size of 45 脳 40 脳 3mmm was used to replace the plastic woven bag. The finished fine sand from the desert of Chifeng City, Inner Mongolia, was used to simulate the actual engineering undisturbed soil. During the whole test process, the number of sand bags and the stacking method of each group of tests were changed in turn, and nine groups of experiments were carried out to ensure that the top sand bag was 30 mm high from the loading device when each group of tests was carried out, and at the end of each group of tests, The fine sand in the sand trough is taken out, and then the sand is backfilled according to the fixed filling method to reduce the initial disturbance as much as possible. At the end of the whole test process, the results of 9 groups of experiments were integrated, analyzed and compared. It was concluded that the consolidation method of sand-filled soil foundation could greatly improve the bearing capacity of the foundation soil. It can effectively reduce the settlement and uneven settlement of the foundation, hoping to provide data and theoretical support for the future study and research. The prospect of the foundation treatment method is forecasted, and it is suitable for any soil area, especially in the coastal soft soil and the northwest sandy soil area, which can better reflect the superiority of the bagged sand foundation reinforcement method.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU472

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