本文選題：深基坑　切入點(diǎn)：FLAC3D　出處：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：深基坑工程是涉及工程地質(zhì)條件、氣候條件、周圍環(huán)境、技術(shù)水平和管理水平等多因素的復(fù)雜的工程問題,具有復(fù)雜性,綜合性,高風(fēng)險(xiǎn)性等特點(diǎn)。樁錨支護(hù)以其經(jīng)濟(jì),安全的特點(diǎn)被廣泛應(yīng)用于深基坑支護(hù)設(shè)計(jì)中。由于基坑超挖,邊坡過載,管線泄漏,預(yù)警滯后等造成的工程事故屢見不鮮,造成了嚴(yán)重的經(jīng)濟(jì)和財(cái)產(chǎn)損失。工程實(shí)踐證明,單純依賴?yán)碚撛O(shè)計(jì)和簡(jiǎn)單的現(xiàn)場(chǎng)監(jiān)測(cè)已經(jīng)很難滿足復(fù)雜周邊環(huán)境、不良地質(zhì)條件等深基坑安全施工。越來越多的學(xué)者開始呼吁加強(qiáng)基坑開挖監(jiān)測(cè)分析,建立完善的信息化施工管理體系以指導(dǎo)施工,達(dá)到安全、經(jīng)濟(jì)、高效施工的效果。本文結(jié)合北京某深基坑工程,在分析其開挖深度、工程地質(zhì)條件、周邊環(huán)境等因素的基礎(chǔ)上對(duì)支護(hù)結(jié)構(gòu)進(jìn)行了設(shè)計(jì),同時(shí)制定了支護(hù)樁體深層水平位移、樁頂沉降和錨桿軸力等參數(shù)的監(jiān)測(cè)方案,并根據(jù)規(guī)范要求制定了監(jiān)測(cè)預(yù)警值。通過對(duì)監(jiān)測(cè)數(shù)據(jù)的整理和分析,研究了支護(hù)結(jié)構(gòu)內(nèi)力、變形特征及基坑邊坡穩(wěn)定性,總結(jié)了樁錨支護(hù)體系在粉砂地層基坑支護(hù)中的應(yīng)用效果。借助基于有限差分法的FLAC3D數(shù)值模擬軟件進(jìn)行基坑開挖模擬分析。根據(jù)工程地質(zhì)勘察數(shù)據(jù)建立地層模型和設(shè)置合理邊界條件,并采用Cable單元、Pile單元和Beam單元等模擬支護(hù)結(jié)構(gòu)。用Null單元模擬基坑分部開挖,并記錄每層開挖時(shí)最大不平衡力和各單元內(nèi)力及變形情況。最后通過對(duì)比模擬數(shù)據(jù)和監(jiān)測(cè)成果,驗(yàn)證基坑穩(wěn)定性,并為以后類似工程提供設(shè)計(jì)參考。
[Abstract]:Deep foundation pit engineering is a complex engineering problem involving many factors, such as engineering geological condition, climate condition, surrounding environment, technical level and management level. It has the characteristics of complexity, comprehensiveness, high risk and so on. The characteristics of safety are widely used in deep foundation pit support design. Engineering accidents caused by over-excavation of foundation pit, slope overload, pipeline leakage and early warning lag have caused serious economic and property losses. Relying solely on theoretical design and simple on-site monitoring, it has been difficult to meet the complex surrounding environment, poor geological conditions and other deep foundation pit safe construction. More and more scholars began to call for strengthening the foundation pit excavation monitoring analysis. A perfect information construction management system is established to guide the construction to achieve the effect of safe, economical and efficient construction. This paper analyzes the excavation depth and engineering geological conditions of a deep foundation pit project in Beijing. Based on the surrounding environment and other factors, the supporting structure is designed, and the monitoring scheme of the deep horizontal displacement of the supporting pile, the settlement of the pile top and the axial force of the bolt are established. According to the requirements of the code, the monitoring and early warning value is established. Through the analysis of the monitoring data, the internal force, deformation characteristics and slope stability of the foundation pit are studied. The application effect of pile anchor support system in silt foundation pit support is summarized. The foundation pit excavation simulation analysis is carried out with the help of FLAC3D numerical simulation software based on finite difference method. The stratum model is established according to the engineering geological survey data. Setting reasonable boundary conditions, Cable element and Beam element are used to simulate the excavation of foundation pit, and the maximum unbalanced force and the internal force and deformation of each unit are recorded by Null element. Finally, the simulation data and monitoring results are compared. Verify the stability of foundation pit and provide design reference for similar projects in the future.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【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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