北京地区PBA工法地铁车站地表沉降规律的研究

发布时间：2018-04-16 01:15

本文选题：Peck公式 + PBA　；参考：《中国地质大学(北京)》2017年硕士论文

【摘要】：北京地铁工程的建设仍然在不断的进行之中,其中地铁车站作为地铁运输人车交换的场所,必然要靠近人口密集的地方。这些地方往往都是商业繁华地区,周边各种管线密布、高楼林立,地表沉降过大会威胁到这些建筑物的正常使用和安全。因此对于地铁车站周边沉降的控制显得十分重要。PBA洞桩法因其沉降控制好等原因,在地铁车站的修建过程中被广泛的应用。但是目前对于PBA工法的研究都是实践经验超前理论研究,所以本文对于PBA地铁车站地表沉降规律做了研究。本文基于美术馆地铁车站的地表沉降值,对于Peck经验公式相应的参数取值,提出了自己的取值公式或者方法。使它能够对PBA地铁车站地表横向沉降规律进行描述。通过美术馆地铁车站等车站的实测地表沉降值与修改后的公式比较,发现修改后的公式与实际值拟合较好,验证了公式的准确性和一般性。最后利用FLAC 3D数值模拟软件建立了3种情况的模型,进行对比分析。在这个过程中发现了,一个系数取值的错误,修改之后并分析原因。最后把改正错误后的修正公式地表沉降曲线与模拟情况进行对比,发现二者拟合良好,进一步证明了修正公式的准确性和一般性。最后得出了一个适用于描述PBA地铁车站地表横向沉降规律的经验公式,并且可以通过已知车站得出的相应参数求未知车站地表沉降规律。本文希望该公式能得到更多实际工程的验证,并且对于PBA车站地表沉降的研究有一定的启示意义,在实际施工过程中可以帮助工程更好的控制地表沉降值。
[Abstract]:The construction of subway engineering in Beijing is still in progress, among which the subway station, as a place for exchanging people and cars, is bound to be close to the densely populated area.These places are often commercial areas, surrounded by a variety of pipelines, tall buildings, the settlement of the General Assembly to threaten the normal use and safety of these buildings.Therefore, it is very important to control the settlement around the subway station. PBA pile method is widely used in the construction process of subway station because of its good settlement control and other reasons.But at present, the research of PBA construction method is a practical empirical advanced theory, so this paper studies the law of ground subsidence of PBA subway station.Based on the ground subsidence value of the subway station in the art gallery, this paper puts forward its own formula or method for choosing the corresponding parameters of the Peck empirical formula.It can describe the law of surface lateral settlement of PBA subway station.Through the comparison between the measured ground subsidence value and the modified formula, it is found that the modified formula fits well with the actual value, which verifies the accuracy and generality of the formula.At last, FLAC 3D numerical simulation software is used to establish the models of three cases and to carry out comparative analysis.In the process, a coefficient value error was found, after modification and analysis of the cause.Finally, the surface subsidence curve after correction is compared with the simulation, and it is found that both of them fit well, which further proves the accuracy and generality of the modified formula.Finally, an empirical formula suitable for describing the law of surface lateral subsidence of PBA subway station is obtained, and the law of surface subsidence of unknown station can be obtained by the corresponding parameters obtained from known stations.This paper hopes that the formula can be verified by more practical projects and has some enlightenment significance for the study of surface subsidence of PBA station. It can help the project to control the value of surface settlement better in the actual construction process.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U231.3;P642.26

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