【摘要】：以太原鐵路職工文化活動(dòng)中心綜合改造項(xiàng)目為工程背景,針對(duì)深基坑開(kāi)挖面積大、緊鄰建筑物、地表環(huán)境要求嚴(yán)格及支護(hù)結(jié)構(gòu)復(fù)雜等不利因素,深入分析了深基坑組合支護(hù)結(jié)構(gòu)內(nèi)力和變形規(guī)律。利用Flac3d三維有限差分軟件,采用摩爾庫(kù)倫本構(gòu)模型,模擬了冠梁、鋼筋混凝土灌注樁以及鋼管支撐的組合支護(hù)形式。鋼筋混凝土灌注樁是用實(shí)體單元來(lái)模擬,考慮到樁土之間摩擦問(wèn)題設(shè)置了接觸面。冠梁和鋼管支撐是用Beam單元來(lái)模擬。論文闡述了用Flac3d三維有限差分軟件創(chuàng)建復(fù)雜支護(hù)結(jié)構(gòu)的方法,詳細(xì)地介紹了用實(shí)體單元?jiǎng)?chuàng)建任意位置灌注樁的方法以及不同結(jié)構(gòu)單元之間建立連接的方法。建立摩爾庫(kù)倫彈塑性三維基坑計(jì)算模型,分析了組合支護(hù)結(jié)構(gòu)內(nèi)力和變形規(guī)律問(wèn)題并分析了基坑開(kāi)挖對(duì)地表沉降的影響規(guī)律。得出了針對(duì)本基坑的設(shè)計(jì)基本原則和基坑變形機(jī)理,為同類(lèi)深基坑工程的施工提供參考。
[Abstract]:Taking the comprehensive reconstruction project of Taiyuan Railway Workers' Cultural activity Center as the engineering background, aiming at the unfavorable factors such as large excavation area, close to buildings, strict surface environmental requirements and complex supporting structure, etc. The law of internal force and deformation of deep foundation pit composite support structure is deeply analyzed. The combined support forms of crown beam, reinforced concrete cast-in-place pile and steel pipe bracing are simulated by using Flac3d three-dimensional finite difference software and the Moore Coulomb constitutive model. The reinforced concrete cast-in-place pile is simulated by solid element, and the contact surface is set up considering the friction between pile and soil. The crown beam and steel tube bracing are simulated by Beam element. In this paper, the method of creating complex supporting structure with Flac3d 3D finite difference software is described, and the method of creating cast-in-place pile in any position with solid element and the method of establishing connection between different structural elements are introduced in detail. The calculation model of Mohr Coulomb elastoplastic three-dimensional foundation pit is established. The internal force and deformation of composite support structure are analyzed and the influence of excavation on surface settlement is analyzed. The basic design principles and deformation mechanism of the foundation pit are obtained, which provide reference for the construction of similar deep foundation pit projects.
【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TU473.2

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