本文關(guān)鍵詞：天津地區(qū)深基坑支護(hù)設(shè)計(jì)與施工研究　出處：《湖北工業(yè)大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 基坑 降水 開(kāi)挖

【摘要】：在城市建設(shè)的過(guò)程中,由于人口密度大、土地利用率逐漸提高,而基坑工程周邊的環(huán)境往往非常復(fù)雜。地基土一般由一定層厚的第四季松散沉積物構(gòu)成,如人工土層、粘土層、淤泥層、粉質(zhì)粘土層、卵礫石層、淤泥質(zhì)土層、砂層等,這些松散物構(gòu)成土層在基坑開(kāi)挖時(shí),它的自穩(wěn)高度是很有限的。地下水埋深較淺時(shí),水壓力作用在圍護(hù)結(jié)構(gòu),對(duì)圍護(hù)結(jié)構(gòu)的側(cè)向變形有很大影響,如果不用以有效防范,發(fā)生管涌、流砂、突涌等現(xiàn)象的可能性大大提高,從而加速基坑失穩(wěn)破壞。建筑施工過(guò)程中深基坑工程造成的影響以及存在的不確定性因素太多,從目前的情況來(lái)看工程實(shí)踐比相關(guān)的理論研究成果更加有利于工程建設(shè)的開(kāi)展,現(xiàn)在很多工程都是通過(guò)施工經(jīng)驗(yàn)來(lái)確定深基坑工程建設(shè)的具體方案,不過(guò)這種處理方式存在的問(wèn)題很多,雖然很多建筑設(shè)計(jì)師都在對(duì)深基坑工程的支護(hù)技術(shù)進(jìn)行了大量的研究,也進(jìn)行了大量的實(shí)驗(yàn)來(lái)判斷支護(hù)方案的可靠性,不過(guò)在實(shí)際運(yùn)用的過(guò)程中仍然會(huì)發(fā)生安全事故。在建筑行業(yè)快速發(fā)展的階段,怎樣保證施工的進(jìn)度、工程質(zhì)量以及施工安全是業(yè)界需要去思考的問(wèn)題,而其中基坑支護(hù)方案的選擇是其中一項(xiàng)非常重要的工作,合理的選擇支護(hù)方案不僅能夠節(jié)約施工成本還能夠盡可能的降低安全事故發(fā)生的概率。本文主要針對(duì)深基坑施工工藝以及深基坑動(dòng)態(tài)施工的數(shù)值這兩方面的內(nèi)容進(jìn)行研究。采用的研究方法主要有兩種,第一種是對(duì)深基坑施工現(xiàn)場(chǎng)相關(guān)參數(shù)的監(jiān)測(cè),第二種是有限元分析法。將這兩種方法結(jié)合起來(lái)分析以此來(lái)確定深基坑工程施工過(guò)程中圍護(hù)結(jié)構(gòu)的內(nèi)部應(yīng)力、基坑位移以及基坑巖土體等參數(shù)指標(biāo)。造成基坑位移是由于土體被開(kāi)挖導(dǎo)致的,而且進(jìn)行基坑開(kāi)挖會(huì)使得基坑中的應(yīng)力指標(biāo)出現(xiàn)變化:各種支護(hù)結(jié)構(gòu)的適用范圍都有所不同,因此不能夠簡(jiǎn)單的判斷這些支護(hù)技術(shù)的好壞,現(xiàn)階段很多施工單位都采用鋼管樁+錨桿這種支護(hù),其主要作用是降低基坑位移值。在進(jìn)行土體開(kāi)挖時(shí)需要根據(jù)土層的結(jié)構(gòu)特征以及施工單位擁有的技術(shù)來(lái)合理的選擇支護(hù)方案而且盡可能的使得支護(hù)方案多樣化,這樣能夠提高基坑的穩(wěn)定性。
[Abstract]:In the process of urban construction, because of the large population density, the land utilization rate is gradually increased, and the surrounding environment of foundation pit engineering is often very complex. The foundation soil is usually composed of loose sediments in the fourth quarter of a certain layer thickness. Such as artificial soil layer, clay layer, silt layer, silty clay layer, gravel layer, silt soil layer, sand layer and so on. When the groundwater depth is shallow, the water pressure acting on the enclosure structure has a great influence on the lateral deformation of the enclosure structure. If it is not necessary to take effective precautions, piping and sand flow will occur. The possibility of sudden surge is greatly increased, which accelerates the failure of foundation pit instability. The influence of deep foundation pit engineering and the uncertainty factors are too many in the process of building construction. From the current situation, engineering practice is more conducive to the development of engineering construction than related theoretical research results. Now, many projects are based on construction experience to determine the specific project of deep foundation pit construction. However, there are many problems in this way, although many architects have done a lot of research on the support technology of deep foundation pit engineering, and a large number of experiments have been carried out to judge the reliability of the support scheme. However, in the process of practical application, there will still be safety accidents. In the stage of rapid development of the construction industry, how to ensure the progress of construction, engineering quality and construction safety is a problem that the industry needs to think about. Among them, the selection of foundation pit support scheme is one of the very important work. Reasonable selection of supporting scheme can not only save the construction cost but also reduce the probability of safety accidents as far as possible. This paper mainly focuses on the deep foundation pit construction technology and the numerical value of deep foundation pit dynamic construction. There are two kinds of research methods. The first is to monitor the relevant parameters of deep foundation pit construction site, the second is the finite element analysis method. The two methods are combined to determine the internal stress of the retaining structure in the construction process of deep foundation pit. The displacement of foundation pit is caused by the excavation of soil. And the excavation of foundation pit will make the stress index of foundation pit change: the scope of application of various supporting structures are different, so we can not simply judge the quality of these supporting techniques. At the present stage, many construction units adopt this kind of support of steel pipe pile and bolt. Its main function is to reduce the displacement value of foundation pit. In the excavation of soil we should choose the support scheme reasonably according to the structure characteristics of soil layer and the technology owned by the construction unit and make the support scheme as diverse as possible. This can improve the stability of foundation pit.
【學(xué)位授予單位】：湖北工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TU753

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