復(fù)雜地質(zhì)條件下基坑工程施工技術(shù)研究與應(yīng)用
發(fā)布時間：2018-10-24 20:47
【摘要】：隨著我國經(jīng)濟(jì)的快速發(fā)展,城市建設(shè)步伐進(jìn)一步加快,而城市規(guī)模的快速發(fā)展與建設(shè)用地緊張的矛盾日益激烈,因此開發(fā)地下空間,增加建筑物地下室層數(shù)成為工程建設(shè)中的重要手段。隨著建筑工程基坑開挖深度的增大,地下土體土層復(fù)雜多變、基坑降水工程量大、土體支護(hù)穩(wěn)定性差等特點逐漸顯現(xiàn),促使了工程技術(shù)人員對深基坑工程理論的研究與探索,但是也出現(xiàn)了許多慘痛的工程事故,基坑工程安全問題已成為基坑施工的一個嚴(yán)峻問題。研究以開灤協(xié)鑫發(fā)電有限公司(2x300MW)機(jī)組工程為例,對深基坑支護(hù)工程理論與施工技術(shù)進(jìn)行了研究,為保證施工質(zhì)量及工期的要求,對施工保證措施進(jìn)行了探索,通過一系列措施的實施,降低工程成本。文中對分層橫挖法進(jìn)行介紹,通過改良開挖方式加快施工進(jìn)度,開挖過程中,從一端沿橫斷面分層挖至設(shè)計標(biāo)高,每層的運輸?shù)缆泛团R時排水設(shè)施均單獨分布,以適應(yīng)深而短的開挖場地;為解決大量土方運出,采用每層縱向開挖,預(yù)定出土方向,分層獨立運輸及局部隨機(jī)出土的方式;土方開挖支護(hù)中,將各種支護(hù)方法進(jìn)行了合理匹配(原位土體+土釘+預(yù)應(yīng)力錨桿+掛網(wǎng)噴射混凝土面層+支護(hù)排樁+工具式組合內(nèi)支撐),以保證在一定范圍內(nèi)不同基坑開挖深度、環(huán)境、地質(zhì)條件下超深基坑支護(hù)結(jié)構(gòu)選型,不同工程基坑支護(hù)與工程永久結(jié)構(gòu)統(tǒng)籌匹配同步設(shè)計,實現(xiàn)全壽命周期性效益的最大化。通過對復(fù)雜地質(zhì)條件下深基坑工程設(shè)計與施工研究,以及相關(guān)保障措施的分析,為相似工程提供參考依據(jù),對建立深基坑工程理論具有重要意義。
[Abstract]:With the rapid economic development of our country, the pace of urban construction has been further accelerated, and the contradiction between the rapid development of urban scale and the tension of construction land is becoming increasingly fierce, so the underground space is being developed. Increasing the number of basement floors has become an important means of engineering construction. With the increase of the excavation depth of the foundation pit, the complex and changeable soil layer, the large amount of foundation pit dewatering, the poor stability of soil support and so on, the research and exploration of the engineering theory of the deep foundation pit are promoted by engineers and technicians. However, there are many tragic engineering accidents, and the safety of foundation pit has become a severe problem in foundation pit construction. Taking the unit project of Kailuan Xiexin Power Generation Co., Ltd. (2x300MW) as an example, the theory and construction technology of deep foundation pit supporting engineering are studied. In order to ensure the construction quality and the requirement of construction period, the construction guarantee measures are explored. Through the implementation of a series of measures to reduce the cost of the project. In this paper, the method of delamination and transverse excavation is introduced, and the construction progress is accelerated by improving the excavation method. In the course of excavation, from one end along the cross section to the design elevation, the transport roads and temporary drainage facilities on each floor are distributed separately. In order to adapt to the deep and short excavation site, to solve the problem of large amount of earth moving out, we adopt the method of longitudinal excavation of each layer, predefined unearthed direction, stratified independent transportation and partial random excavations; in the excavation and support of earthwork, In order to ensure the different excavation depth and environment in a certain range, various supporting methods are reasonably matched (in situ soil nailing prestressed anchor bolt hanging net shotcrete surface support and pile layout tool combination support). In order to maximize the periodic benefit of the whole life, the supporting structure of ultra-deep foundation pit is selected under geological conditions, and the matching design of foundation pit support and permanent structure of different engineering projects is carried out as a whole. Through the study on the design and construction of deep foundation pit under complex geological conditions, as well as the analysis of relevant safeguard measures, this paper provides a reference for similar engineering, and is of great significance to the establishment of the theory of deep foundation pit engineering.
【學(xué)位授予單位】：華北理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU753
本文編號：2292518
[Abstract]:With the rapid economic development of our country, the pace of urban construction has been further accelerated, and the contradiction between the rapid development of urban scale and the tension of construction land is becoming increasingly fierce, so the underground space is being developed. Increasing the number of basement floors has become an important means of engineering construction. With the increase of the excavation depth of the foundation pit, the complex and changeable soil layer, the large amount of foundation pit dewatering, the poor stability of soil support and so on, the research and exploration of the engineering theory of the deep foundation pit are promoted by engineers and technicians. However, there are many tragic engineering accidents, and the safety of foundation pit has become a severe problem in foundation pit construction. Taking the unit project of Kailuan Xiexin Power Generation Co., Ltd. (2x300MW) as an example, the theory and construction technology of deep foundation pit supporting engineering are studied. In order to ensure the construction quality and the requirement of construction period, the construction guarantee measures are explored. Through the implementation of a series of measures to reduce the cost of the project. In this paper, the method of delamination and transverse excavation is introduced, and the construction progress is accelerated by improving the excavation method. In the course of excavation, from one end along the cross section to the design elevation, the transport roads and temporary drainage facilities on each floor are distributed separately. In order to adapt to the deep and short excavation site, to solve the problem of large amount of earth moving out, we adopt the method of longitudinal excavation of each layer, predefined unearthed direction, stratified independent transportation and partial random excavations; in the excavation and support of earthwork, In order to ensure the different excavation depth and environment in a certain range, various supporting methods are reasonably matched (in situ soil nailing prestressed anchor bolt hanging net shotcrete surface support and pile layout tool combination support). In order to maximize the periodic benefit of the whole life, the supporting structure of ultra-deep foundation pit is selected under geological conditions, and the matching design of foundation pit support and permanent structure of different engineering projects is carried out as a whole. Through the study on the design and construction of deep foundation pit under complex geological conditions, as well as the analysis of relevant safeguard measures, this paper provides a reference for similar engineering, and is of great significance to the establishment of the theory of deep foundation pit engineering.
【學(xué)位授予單位】：華北理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU753
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