【摘要】：復(fù)雜環(huán)境中深基坑的支護(hù)施工時(shí)面臨的巖土問(wèn)題一直是建筑施工中的一個(gè)難題,引起了建筑行業(yè)的眾多專家學(xué)者的研究。本文以湘潭市窯灣歷史文化街區(qū)酒吧街的深基坑支護(hù)為工程背景,采用理正深基坑分析和數(shù)值計(jì)算相結(jié)合的研究方法,對(duì)臨近高壓電塔的深基坑開(kāi)挖過(guò)程中的變形和高壓電塔的穩(wěn)定性進(jìn)行了研究,主要工作及結(jié)論包括:(1)為解決臨近基坑高壓電塔穩(wěn)定性的問(wèn)題,本文采取理論分析與數(shù)值分析相結(jié)合的分析方法,對(duì)臨近基坑高壓電塔穩(wěn)定性的影響因素進(jìn)行了歸納,主要分析了三個(gè)因素:差異沉降、外荷載分布、基礎(chǔ)方案選型。(2)介紹了深基坑支護(hù)工程案例的概況及面臨的問(wèn)題,為確�；禹敳扛邏弘娝姆�(wěn)定性,采用了理正設(shè)計(jì)軟件進(jìn)行方案初步設(shè)計(jì),確定了支護(hù)方案,為后續(xù)的數(shù)值模擬提供了可行性的方案。(3)結(jié)合得出的深基坑支護(hù)方案,利用數(shù)值方法對(duì)深基坑開(kāi)挖過(guò)程進(jìn)行了模擬。首先建立了深基坑開(kāi)挖過(guò)程的有限元模型,分析了影響高壓電塔地基穩(wěn)定性在開(kāi)挖過(guò)程中的影響因素;然后結(jié)合施工過(guò)程中分步開(kāi)挖工況,并對(duì)其進(jìn)行了模擬,計(jì)算處了每一個(gè)工況中高壓電塔基礎(chǔ)的沉降值。通過(guò)改變分步開(kāi)挖厚度、錨桿預(yù)應(yīng)力、嵌固深度這三個(gè)因素,歸納了這三個(gè)因素對(duì)臨近高壓電塔穩(wěn)定性的影響規(guī)律;最后通過(guò)對(duì)高壓電塔穩(wěn)定和結(jié)構(gòu)內(nèi)力的檢驗(yàn)和比較,提出了基坑開(kāi)挖與支護(hù)的控制指標(biāo),為以后此類工程問(wèn)題提供參考。
[Abstract]:The geotechnical problem in the support construction of deep foundation pit in complex environment has always been a difficult problem in construction, which has caused the research of many experts and scholars in the construction industry. Taking the deep foundation pit support of bar street in Yaowan Historical and Cultural District of Xiangtan City as the engineering background, this paper adopts the research method of combining the analysis and numerical calculation of the deep foundation pit. The deformation of the deep foundation pit adjacent to the high voltage tower and the stability of the high voltage tower are studied. The main work and conclusions are as follows: (1) in order to solve the problem of the stability of the high voltage tower near the foundation pit, In this paper, the influencing factors of the stability of high voltage tower near foundation pit are summarized by means of theoretical analysis and numerical analysis, and three factors are mainly analyzed: differential settlement, external load distribution, The type selection of foundation scheme is introduced. (2) the general situation and problems of deep foundation pit support engineering are introduced. in order to ensure the stability of high voltage tower at the top of foundation pit, the reasonable design software is used to carry out the preliminary design of the scheme, and the supporting scheme is determined. It provides a feasible scheme for the subsequent numerical simulation. (3) combined with the deep foundation pit support scheme, the numerical method is used to simulate the excavation process of the deep foundation pit. Firstly, the finite element model of deep foundation pit excavation process is established, and the influencing factors of high voltage tower foundation stability in the excavation process are analyzed. Then, combined with the step-by-step excavation condition in the construction process, the settlement value of the high voltage tower foundation in each working condition is calculated. By changing the thickness of step excavation, anchor rod prestress and embedded depth, the influence of these three factors on the stability of adjacent high voltage tower is summarized. Finally, through the test and comparison of the stability of the high voltage tower and the internal force of the structure, the control index of foundation pit excavation and support is put forward, which provides a reference for this kind of engineering problems in the future.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU753

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本文編號(hào)：2490385