本文選題：基坑工程　切入點(diǎn)：支護(hù)結(jié)構(gòu)設(shè)計(jì)　出處：《東華理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：深基坑工程是城市發(fā)展繁榮和進(jìn)步后的必然產(chǎn)物,它所涉及的問題多廣雜,并且要求技術(shù)先進(jìn)。深基坑工程也是一項(xiàng)復(fù)雜的、高風(fēng)險(xiǎn)的系統(tǒng)工程,涉及學(xué)科較多,有工程地質(zhì)、水位地質(zhì)學(xué)、土力學(xué)、流體力學(xué)、工程力學(xué)、結(jié)構(gòu)力學(xué)、環(huán)境科學(xué)等,具有非常強(qiáng)的綜合性及諸多影響因素。隨著城市建筑物越來越多及舊城區(qū)改造,基坑工程開挖空間有限,對(duì)基坑工程要求較高,在保證自身安全使得地下工程能順利進(jìn)行同時(shí),還需要保證周邊建筑物、管線、道路等安全。研究深基坑工程在施工中應(yīng)力應(yīng)變、變形及其穩(wěn)定性具有重要的實(shí)際意義。本文以廣州保利冼村舊城改造深基坑工程為背景,采用理正軟件及FLAC3D軟件進(jìn)行論文深基坑支護(hù)設(shè)計(jì)及模擬計(jì)算,并將計(jì)算結(jié)果與工程實(shí)際監(jiān)測(cè)進(jìn)行對(duì)比分析,兩者之間存在一定差異,但整體吻合度較好,驗(yàn)證了數(shù)值模擬方法在深基坑工程中的實(shí)用性。本文研究了基坑分步開挖過程中,基坑支護(hù)結(jié)構(gòu)的水平位移、豎直位移、預(yù)應(yīng)力錨索軸力、支護(hù)樁彎矩、基坑土體塑性區(qū)等變化特點(diǎn),主要詳細(xì)研究?jī)?nèi)容:(1)本文以廣州保利冼村舊城改造深基坑工程為例,首先用FLAC3D軟件模擬無支護(hù)條件下基坑開挖過程的變形特征及其應(yīng)力分布,并找出其受力薄弱部位,運(yùn)用理正軟件有針對(duì)性地進(jìn)行基坑支護(hù)設(shè)計(jì)計(jì)算,得到快速優(yōu)化設(shè)計(jì),提高了工作效率,也探索了兩個(gè)基于不理論方法的計(jì)算軟件的優(yōu)點(diǎn)結(jié)合,驗(yàn)證了本深基坑工程采用樁錨支護(hù)的合理性;(2)在FLAC3D模擬基坑開挖過程,對(duì)基坑水平位移、地表沉降及錨桿內(nèi)力進(jìn)行模擬監(jiān)測(cè),數(shù)值模擬軟件監(jiān)測(cè)結(jié)果與實(shí)際過程監(jiān)測(cè)數(shù)據(jù)進(jìn)行對(duì)比存在一定差異,主要原因是巖土參數(shù)離散性大、數(shù)值模擬難以時(shí)空效應(yīng)及難以將諸多影響因素綜合考慮,但發(fā)展趨勢(shì)及數(shù)量結(jié)果與實(shí)際監(jiān)測(cè)數(shù)據(jù)較吻合,驗(yàn)證本深基坑工程數(shù)值模擬的合理性及可行性,為本地區(qū)或相類似的深基坑工程提供參考;(3)通過FLAC3D采用強(qiáng)度折減系數(shù)法對(duì)基坑邊坡進(jìn)行穩(wěn)定性分析,結(jié)合理正深基坑設(shè)計(jì)軟件基坑整體穩(wěn)定性分析、抗傾覆穩(wěn)定性分析及抗隆起穩(wěn)定性分析對(duì)比,運(yùn)用多種方法評(píng)價(jià)基坑穩(wěn)定性,提高了穩(wěn)定性分析的可靠度。
[Abstract]:Deep foundation pit engineering is an inevitable product of urban development, prosperity and progress. It involves a wide variety of problems and requires advanced technology. Deep foundation pit engineering is also a complex, high-risk system engineering, involving more disciplines, engineering geology, Water level geology, soil mechanics, fluid mechanics, engineering mechanics, structural mechanics, environmental science and so on, have very strong comprehensive and many influence factors. In order to ensure the safety of underground engineering, it is necessary to ensure the safety of surrounding buildings, pipelines, roads and so on. Deformation and its stability are of great practical significance. Based on the reconstruction of deep foundation pit in the old city of Pouli Xian Village in Guangzhou, this paper adopts the software of Lizheng and FLAC3D to carry out the design and simulation calculation of deep foundation pit support. The comparison and analysis between the calculation results and the engineering monitoring results show that there are some differences between the two, but the overall consistency is good, which verifies the practicability of the numerical simulation method in the deep foundation pit engineering. In this paper, the step-by-step excavation process of the foundation pit is studied. Horizontal displacement, vertical displacement, axial force of prestressed anchor cable, bending moment of supporting pile, plastic zone of soil of foundation pit and so on. The main research contents of this paper are as follows: (1) this paper takes the transformation of deep foundation pit in the old city of Pouli Xian village in Guangzhou as an example. First, FLAC3D software is used to simulate the deformation characteristics and stress distribution in the excavation process of foundation pit without support, and to find out the weak position of the stress, and to carry out the design calculation of foundation pit support with the proper software, and to obtain the rapid optimization design. The efficiency is improved, and the advantages of two calculation software based on non-theoretical method are explored. The rationality of adopting pile and anchor support in this deep foundation pit engineering is verified, and the horizontal displacement of foundation pit is simulated in FLAC3D. Ground subsidence and anchor internal force are simulated and monitored. The results of numerical simulation software are different from the actual monitoring data. The main reason is the large dispersion of geotechnical parameters. The numerical simulation is difficult to take into account the space-time effect and the influence factors, but the development trend and the quantity result are in agreement with the actual monitoring data, which verifies the rationality and feasibility of the numerical simulation of the deep foundation pit engineering. This paper provides a reference for local or similar deep foundation pit engineering. Through FLAC3D, the stability analysis of foundation pit slope is carried out by using strength reduction coefficient method, and the overall stability analysis of foundation pit is combined with Lizheng deep foundation pit design software. Compared with the stability analysis of anti-overturning stability and anti-uplift stability, a variety of methods are used to evaluate the stability of foundation pit, which improves the reliability of stability analysis.
【學(xué)位授予單位】：東華理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU473.2

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