【摘要】：在城市發(fā)展中,隨著人口的增多,人口密度的增大,城市高層建筑和軌道交通得以快速發(fā)展,基坑工程也向著深、大、復(fù)雜方面發(fā)展,發(fā)生了不少重大工程事故,造成了不少安全損害和經(jīng)濟(jì)損失。另外一方面,不少深基坑支護(hù)設(shè)計(jì)中存在著過(guò)度保守,造成巨大浪費(fèi)。因此,在保證工程安全和質(zhì)量前提下,如何對(duì)深基坑支護(hù)形式進(jìn)行優(yōu)化選型顯得非常重要。本文以鄭州地鐵農(nóng)業(yè)路車站和黃河路車站深基坑為工程背景,總結(jié)分析工程實(shí)測(cè)數(shù)據(jù),結(jié)合數(shù)值模擬分析方法,研究地鐵深基坑地下連續(xù)墻的變形特征,以及基坑開挖對(duì)周圍環(huán)境的影響,綜合模擬、對(duì)比分析各種形式的支護(hù),進(jìn)行優(yōu)化選型,可指導(dǎo)深基坑工程設(shè)計(jì)、施工。具體研究?jī)?nèi)容如下：1、總結(jié)分析了當(dāng)前深基坑工程發(fā)展現(xiàn)狀,分析了基坑支護(hù)形式的發(fā)展趨勢(shì)和深基坑支護(hù)優(yōu)化選型的研究現(xiàn)狀。2、以鄭州地鐵農(nóng)業(yè)路車站和黃河路車站深基坑為工程背景,對(duì)工程實(shí)測(cè)數(shù)據(jù)進(jìn)行了總結(jié),分析了基坑開挖過(guò)程中支護(hù)結(jié)構(gòu)的受力、變形規(guī)律,為以后深基坑工程設(shè)計(jì)、施工提供了依據(jù)。3、通過(guò)FLAC3D分析軟件,以農(nóng)業(yè)路車站深基坑為工程背景,建立數(shù)值模擬分析模型,進(jìn)行了系統(tǒng)的數(shù)值模擬工作,重點(diǎn)分析了深基坑開挖過(guò)程中的變形特性,并與工程實(shí)測(cè)數(shù)據(jù)進(jìn)行對(duì)比,驗(yàn)證了模型參數(shù)的可靠性4、在上述基礎(chǔ)上運(yùn)用FLAC3 D軟件對(duì)不同支護(hù)形式(排樁內(nèi)支撐、排樁復(fù)合土釘、樁錨復(fù)合土釘)的地鐵深基坑進(jìn)行分析,重點(diǎn)對(duì)比分析各種支護(hù)結(jié)構(gòu)的變形、受力特征,結(jié)合各類支護(hù)結(jié)構(gòu)的造價(jià)成本,進(jìn)行支護(hù)形式優(yōu)化選型,提出合理可行的優(yōu)化支護(hù)建議,結(jié)果為以后類似深基坑的施工和支護(hù)設(shè)計(jì)提供參考。
[Abstract]:In the course of urban development, with the increase of population and density of population, urban high-rise buildings and rail transit have developed rapidly, and foundation pit engineering has also developed to deep, large and complex aspects, and many major engineering accidents have taken place. Caused a lot of security damage and economic losses. On the other hand, a lot of deep foundation pit support design is too conservative, resulting in huge waste. Therefore, under the premise of ensuring engineering safety and quality, it is very important to optimize and select the supporting form of deep foundation pit. Taking the deep foundation pit of Zhengzhou Metro Agricultural Road Station and Huanghe Road Station as the engineering background, this paper summarizes and analyzes the measured data of the project, and studies the deformation characteristics of the underground diaphragm wall of the subway deep foundation pit combined with the numerical simulation analysis method. As well as the influence of foundation pit excavation on the surrounding environment, comprehensive simulation, comparative analysis of various forms of support, optimization selection, can guide the design and construction of deep foundation pit engineering. The concrete research contents are as follows: 1. The present situation of deep foundation pit engineering is summarized and analyzed, the development trend of foundation pit supporting form and the research status of optimization selection of deep foundation pit support are analyzed. 2, Taking the deep foundation pit of Zhengzhou Metro Agricultural Road Station and Huanghe Road Station as the engineering background, this paper summarizes the measured data of the project, analyzes the force and deformation law of the supporting structure in the excavation process of the foundation pit, which is designed for the future deep foundation pit engineering. 3. Through the FLAC3D analysis software and taking the deep foundation pit of the agricultural road station as the engineering background, the numerical simulation analysis model is established, the systematic numerical simulation work is carried out, and the deformation characteristics in the process of deep foundation pit excavation are analyzed with the emphasis on the analysis of the deformation characteristics of the deep foundation pit in the process of excavation. The reliability of the model parameters is verified by comparing with the measured data. On the basis of the above mentioned, the deep foundation pit of subway with different supporting forms (internal support of row pile, composite soil nail of pile row and composite soil nail of pile anchor) is analyzed by using FLAC3 D software. By comparing and analyzing the deformation and force characteristics of various support structures, combining with the cost of all kinds of support structures, the optimal selection of support forms is carried out, and reasonable and feasible optimized support suggestions are put forward. The results provide a reference for the construction and support design of similar deep foundation pit in the future.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU753

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