發(fā)布時(shí)間：2019-05-18 13:48

【摘要】：近幾年來我國社會(huì)經(jīng)濟(jì)持續(xù)快速發(fā)展,城市化建設(shè)進(jìn)程逐步深入,工程項(xiàng)目也不斷增多,新建筑物之間越來越密集,并且城市地下水位相對(duì)較淺,新建筑項(xiàng)目需要深挖基坑。其中涉及到基坑降水、基坑開挖對(duì)周圍建筑物形成的影響,相關(guān)問題嚴(yán)重十分嚴(yán)重必須要引起重視。雖然基坑降水能夠?yàn)榛娱_挖提供更便利的條件,但與此同時(shí)也會(huì)導(dǎo)致周圍土體支護(hù)結(jié)構(gòu)以及水壓力之間發(fā)生變化,并且降水極可能會(huì)導(dǎo)致基坑滲流,極可能會(huì)引發(fā)流砂、流土等現(xiàn)象,嚴(yán)重時(shí)將會(huì)導(dǎo)致周圍建筑發(fā)生沉降。結(jié)合以上所述能夠了解到新建筑工程開挖基坑以及基坑降水方面必須要引起重視。文章主要切合某建筑項(xiàng)目工程基坑事故案例圍繞基坑降水以及基坑開挖對(duì)周圍教學(xué)樓過量沉降方面展開大量研究與分析工作,具體為:通過對(duì)地下水在土體中發(fā)生的運(yùn)移變化展開全面研究與分析,與此同時(shí)圍繞地下水對(duì)土體支護(hù)結(jié)構(gòu)起到的作用以及水、土之間的相互作用展開全面分析,進(jìn)一步通過工程實(shí)例展開分析,確定基坑降水產(chǎn)生的降落漏斗范圍。通過對(duì)新建工程基坑降水對(duì)周圍土體結(jié)構(gòu)引起的沉降情況予以全面分析,并結(jié)合相關(guān)理論對(duì)周圍土層結(jié)構(gòu)沉降差異性展開全面計(jì)算,并在土體固結(jié)過程應(yīng)力是否發(fā)生變化以及變化造成的影響展開全面分析,最終落實(shí)新建工程基坑降水對(duì)周圍地面造成沉降規(guī)律。根據(jù)實(shí)際案例基坑項(xiàng)目3-3單元施工材料,進(jìn)一步全面分析地下水位以及周圍變形監(jiān)測(cè)數(shù)據(jù)。通過將理論計(jì)算方式以及軟件計(jì)算方式相結(jié)合,從中得出了基坑開挖以及基坑降水實(shí)際對(duì)周圍教學(xué)樓造成的沉降現(xiàn)象及其規(guī)律,進(jìn)一步展開對(duì)基坑開挖以及基坑降水對(duì)土層沉降的時(shí)間效應(yīng)以及空間效應(yīng)展開全面分析。通過實(shí)現(xiàn)基坑工程數(shù)據(jù)模型的構(gòu)建,繼而展開更為全面而深入的分析,其中主要引用的構(gòu)建軟件為FLAC3D數(shù)值模擬軟件。其中通過數(shù)據(jù)模型的構(gòu)建后分別圍繞基坑開挖引起的周圍建筑物變形數(shù)據(jù)以及基坑降水引起的周圍建筑物變形數(shù)據(jù)展開全面分析,同時(shí)圍繞基坑降水以及基坑開挖同一時(shí)間進(jìn)行時(shí)得出的建筑物變形數(shù)據(jù)與實(shí)際檢測(cè)的建筑物變形數(shù)據(jù)之間的關(guān)系展開全面分析,最終得出同時(shí)展開基坑開挖以及基坑降水得出的建筑物變形數(shù)據(jù)與實(shí)際檢測(cè)數(shù)據(jù)趨同。為此針對(duì)基坑設(shè)計(jì)的計(jì)算方面理應(yīng)要結(jié)合基坑降水以及基坑開挖同時(shí)考慮周圍環(huán)境。
[Abstract]:In recent years, China's social economy continues to develop rapidly, the process of urbanization construction is gradually deepening, engineering projects are also increasing, new buildings are becoming more and more dense, and the urban groundwater level is relatively shallow, new construction projects need to dig deep foundation pit. Among them, the influence of foundation pit excavation on the formation of surrounding buildings is related to the dewatering of foundation pit, and the related problems must be paid attention to. Although foundation pit dewatering can provide more convenient conditions for foundation pit excavation, at the same time, it will also lead to changes between surrounding soil supporting structure and water pressure, and precipitation is likely to lead to foundation pit seepage, which is likely to lead to sand flow. The phenomenon of flowing soil and so on will lead to the settlement of the surrounding buildings when it is serious. Combined with the above, we can understand that the excavation of foundation pit and the dewatering of foundation pit must be paid attention to. This paper is mainly suitable for the case of foundation pit accident in a construction project. A lot of research and analysis work is carried out around the dewatering of foundation pit and the excessive settlement of surrounding teaching buildings by foundation pit excavation. Through the comprehensive study and analysis of the movement and change of groundwater in soil, at the same time, the function of groundwater on soil supporting structure and the interaction between water and soil are comprehensively analyzed. Further through the analysis of engineering examples, the range of falling funnel produced by foundation pit dewatering is determined. Based on the comprehensive analysis of the settlement caused by the dewatering of the foundation pit of the new project, and combined with the relevant theories, the settlement difference of the surrounding soil layer structure is calculated in an all-round way. In the process of soil consolidation, whether the stress changes and the influence caused by the change is analyzed comprehensively, and finally the settlement law of foundation pit dewatering caused by foundation pit dewatering in the new project is carried out. According to the construction materials of the third unit of the foundation pit project, the groundwater level and the monitoring data of the surrounding deformation are further analyzed in an all-round way. By combining the theoretical calculation method with the software calculation method, the settlement phenomenon and its law caused by foundation pit excavation and foundation pit dewatering to the surrounding teaching building are obtained. Furthermore, the temporal and spatial effects of foundation pit excavation and foundation pit dewatering on soil settlement are analyzed comprehensively. Through the construction of foundation pit engineering data model, and then carry out a more comprehensive and in-depth analysis, in which the main reference construction software is FLAC3D numerical simulation software. After the construction of the data model, the deformation data of the surrounding buildings caused by foundation pit excavation and the deformation data of the surrounding buildings caused by foundation pit dewatering are analyzed comprehensively. At the same time, the relationship between the deformation data of the building and the deformation data of the building detected by the dewatering of the foundation pit and the excavation of the foundation pit at the same time is analyzed comprehensively. Finally, it is concluded that the deformation data of the building obtained from the simultaneous development of foundation pit excavation and foundation pit dewatering are the same as the actual detection data. Therefore, the calculation of foundation pit design should be combined with foundation pit dewatering and foundation pit excavation, and the surrounding environment should be considered at the same time.
【學(xué)位授予單位】：湖北工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU753;TU196.2

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