墙柱结合地基处理模型试验研究

发布时间：2018-05-02 13:15

本文选题：软土地基 + 墙式加固体　；参考：《沈阳建筑大学》2014年硕士论文

【摘要】：在地质条件较差的软土地区,地基土承载力较低,建筑物会发生不均匀沉降,对建筑物的损坏会有很大的程度,并且在隐性工程中,其不均匀沉降的危害,能够引起上部结构的过大变形、开裂、倾斜甚至倒塌。本文主要采用不同桩体和墙体的配制来控制和调平地基的不均匀沉降,使得基础和复合地基能够达到沉降比较均匀的程度。避免和减轻不均匀沉降带来的危害成为当务之急,本文采用不同桩体配置和外围墙式加固体配合使用,形成一种特殊的复合地基模式。该复合地基是由墙式加固体和水泥桩共同承担荷载,桩体由水泥和细砂成桩,墙式加固体和柱状加固体和其间的土体共同承受荷载,他们构成复合地基,在上面铺设一定厚度的筏板,一定厚度的辱垫层和一定厚度的基础垫层。形成特殊的桩筏基础。桩筏复合地基是一种常用的复合地基基础。采用桩筏复合地基不但可以提高基础整体的承载力,同时可以有效地防止由于地基沉降或沉降差过大而造成的危害。调整桩和桩间土水平荷载的分担。桩主要传递竖向荷载,当有水平荷载时要考虑桩和土水平荷载的分担,有外围墙式加固体的控制。因为桩体的竖向承载力相对较大,水平方向承载力相对很低。褥垫层可以减小应力集中的现象。褥垫层可以使得桩体在承受荷载作用时,桩体刺入褥垫层,将其间的土体发生挤密效果,可以很大程度的避免剪切破坏。基础垫层在防水加固上可以起到很好的效果。外围墙式加固体起到增强墙内土体挤密加固的作用,从而增强了复合地基的承载能力。在通过调节墙式增强体内柱状改良体深度降低基础的不均匀沉降,来达到降低基础总体沉降和沉降差值,提高基础最终承载力的目的。在地基土处理的过程中,采用地基土和水泥进行现场搅拌,施工简便快捷,经济与环境效果也俱佳。同时整个地基的解体过程较为容易,而且不采用混凝土桩,因此不会给土壤带来彻底的改变,这是一种环境友好型地基形式。本篇论文主要通过室内模型试验介绍了不同的桩体配置在外围墙式加固体的作用下对基础沉降分布的影响。此种新型复合地基的概念、适用条件和改良形式、加固原理等几方面的内容。详尽的介绍了5种桩体的配置方式在墙式加固体的作用下,进行了5组试验。得出了不同的桩体配置对地基沉降的影响以及通过改变桩体的高度解决地基的不均匀沉降,并找到了最佳的配置方案。
[Abstract]:In the soft soil area with poor geological conditions, the bearing capacity of foundation soil is low, the building will have uneven settlement, the damage to the building will be very large, and in the hidden engineering, the harm of uneven settlement will occur. It can cause the superstructure to deform, crack, tilt or even collapse. In this paper, the preparation of different piles and walls is used to control and level the uneven settlement of the foundation, so that the settlement of the foundation and composite foundation can reach a more uniform degree. It is urgent to avoid and reduce the harm caused by uneven settlement. In this paper, a special composite foundation model is formed by using different pile configurations and the use of peripheral wall and solid. The composite foundation is loaded by the wall plus solid and the cement pile, the pile body is made of cement and fine sand, the wall type plus solid and the column plus solid and the soil between them are subjected to the load together, they constitute the composite foundation. A certain thickness of raft, a certain thickness of insular cushion and a certain thickness of foundation cushion are laid on it. Form a special pile-raft foundation. Pile-raft composite foundation is a common composite foundation foundation. The pile-raft composite foundation can not only improve the bearing capacity of the foundation, but also prevent the damage caused by the settlement or the settlement difference. Adjust the sharing of horizontal load between pile and soil between piles. Pile mainly transfers vertical load, when there is horizontal load, the sharing of pile and soil horizontal load should be considered, with the control of peripheral wall and solid. Because the vertical bearing capacity of the pile is relatively large, the horizontal bearing capacity is relatively low. Cushion can reduce stress concentration. The cushion can make the pile thrust into the cushion when it is subjected to the load, and the soil is compacted, which can avoid shear failure to a great extent. The foundation cushion can play a very good effect in waterproof reinforcement. The external wall type and solid play the role of strengthening the compaction of the soil in the wall, thus enhancing the bearing capacity of the composite foundation. In order to reduce the total settlement of foundation and the difference of settlement, the ultimate bearing capacity of foundation can be improved by adjusting the wall type to enhance the depth of the columnar improved body and reduce the uneven settlement of foundation. In the process of foundation soil treatment, it is convenient and quick to use ground soil and cement to stir in the field, and the economic and environmental effects are also good. At the same time, it is easy to disintegrate the whole foundation and does not use concrete pile, so it will not change the soil completely, which is a kind of environment-friendly foundation. In this paper, the influence of different pile configuration on foundation settlement distribution is introduced by indoor model test. The concept of this new composite foundation, applicable conditions and improved forms, reinforcement principles and other aspects of the content. This paper introduces in detail five kinds of pile configuration methods under the action of wall type and solid, 5 groups of tests are carried out. The influence of different pile configuration on foundation settlement and the solution of uneven settlement by changing the height of pile body are obtained, and the best configuration scheme is found.
【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】：TU753

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