沧州地区素混凝土桩复合地基沉降计算及有限元分析

发布时间：2018-01-04 05:16

本文关键词：沧州地区素混凝土桩复合地基沉降计算及有限元分析　出处：《石家庄经济学院》2015年硕士论文　论文类型：学位论文

【摘要】：素混凝土桩复合地基作为地基处理技术的一种形式,以施工速度快、工期短、工程造价低、加固效果良好、有效控制差异沉降等优点,已经在大量工程实践中推广运用。素混凝土桩复合地基可以很好地适用于不同的地层情况,在软土地区和黄土地区等地基处理工程实践方面已经取得了显著的成效,但是有关理论研究方面的发展还相对缓慢,跟不上实践,以沉降计算理论尤为明显,因此在其实际应用过程中也遇到了很多问题。由于复合地基工程比较复杂且具有很明显的区域性,所以有必要花费大量的时间及精力对不同区域、不同土质进行针对性的研究分析。通过不断地进行实践和理论研究,总结取得的成果及经验,推动素混凝土桩复合地基的进一步发展,争取更早地服务于实际工程。在大量研究了前人成果的基础上,本文以沧州青县博雅庄园1#为例,首先运用现行规范方法对素混凝土桩复合地基承载力和沉降量进行计算,得到的数据均符合规范要求。其次又利用PLAXIS软件对其沉降量进行计算,将规范法和有限元法得到的结果均与实测数据进行对比,对比结果表明有限元计算更加接近于实测数据,从而验证了运用有限元分析法能够较好地用于沧州青县软土地区素混凝土桩复合地基的研究。同时考虑到有限元计算比较繁杂,还未普遍运用于实际工程,在此提出一个修正系数,通过对规范法计算结果进行修正后可以得到近似有限元的结果,使其更加接近实际,实现安全、经济、合理、高效的目的。通过结合工程实例,利用PLAXIS软件建立素混凝土桩复合地基模型,探究了垫层厚度、垫层模量、桩身模量及桩间距对复合地基沉降和桩土应力比的影响规律,同时考虑到工程的安全性以及经济效益,并对其中一些参数取值提出了合理化的建议,取得的成果能够为该地区类似复合地基工程在设计和计算方面提供参考。本文最后对以上研究所得到的成果及存在的不足进行了概述,并且对素混凝土桩复合地基未来需研究的工作做了展望。
[Abstract]:As a kind of foundation treatment technology, plain concrete pile composite foundation has the advantages of fast construction speed, short construction period, low engineering cost, good reinforcement effect and effective control of differential settlement. It has been widely used in engineering practice. The composite foundation of plain concrete pile can be well applied to different strata. In the soft soil area and loess area and other foundation treatment engineering practice has achieved remarkable results, but the development of theoretical research is relatively slow, can not keep up with practice, especially in settlement calculation theory. Therefore, there are many problems in its practical application. Because the composite foundation engineering is complex and has obvious regional, it is necessary to spend a lot of time and energy on different areas. Through continuous practice and theoretical research, summarize the achievements and experience, promote the further development of plain concrete pile composite foundation. In order to serve the actual project earlier. On the basis of a large number of previous studies, this paper takes Boya Manor 1# in Cangzhou Qingxian County as an example. First, the bearing capacity and settlement of plain concrete pile composite foundation are calculated by using the current code method, and the obtained data all meet the requirements of the code. Secondly, the settlement of the composite foundation is calculated by using PLAXIS software. The results obtained by the standard method and the finite element method are compared with the measured data, and the comparison results show that the finite element method is closer to the measured data. It is proved that the finite element analysis method can be used to study the composite foundation of plain concrete pile in the soft soil area of Cangzhou Qingxian county, and considering the complexity of finite element calculation, it has not been widely used in practical engineering. In this paper, a correction coefficient is put forward. By modifying the calculation result of the standard method, we can get the approximate finite element result, which makes it more close to the reality, and realizes the safety, economy and reasonableness. The purpose of high efficiency is to establish the composite foundation model of plain concrete pile with PLAXIS software, and to explore the thickness and modulus of cushion. The influence of pile modulus and pile spacing on settlement and pile-soil stress ratio of composite foundation is studied. The safety and economic benefit of the project are considered, and some reasonable suggestions are put forward. The results obtained can provide a reference for the design and calculation of similar composite foundation engineering in this area. Finally, this paper summarizes the results and shortcomings of the above research. The future research work of plain concrete pile composite foundation is prospected.
【学位授予单位】：石家庄经济学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU470

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