本文選題：基坑支護 + 變形控制��； 參考：《吉林大學》2012年碩士論文

【摘要】：隨著社會經(jīng)濟的不斷發(fā)展,城市建筑物的高度持續(xù)增加,使得基坑工程的開挖深度越來越大,并且由于場地條件狹窄,周圍建筑物密集,又有地下管線,這對基坑的穩(wěn)定性和變形的要求越來越高。因此近考慮強度和穩(wěn)定性的基坑設(shè)計方法已很難滿足復雜環(huán)境下基坑的設(shè)計和施工的要求,在許多工程需要以變形為主要控制條件。深基坑工程的施工會使基坑周圍土體產(chǎn)生位移、坑底土體出現(xiàn)隆起、周邊地表產(chǎn)生沉降等變形,變形值過大將會引起基坑失穩(wěn)或危及周圍建筑物、地下管線等。所以在基坑工程施工前進行較為準確的變形預測分析,對可能出現(xiàn)過大變形的位置進行加固,是避免這些事故發(fā)生的較為有益的方法。 論文以長春市國際金融中心基坑工程為背景,針對具體的工程條件和場地工程地質(zhì)條件,在分析各類支護結(jié)構(gòu)特點的基礎(chǔ)上,提出了適用于該工程施工的的基坑支護方案、降水方案,并進行了支護結(jié)構(gòu)的詳細設(shè)計計算、穩(wěn)定性分析。采用大型巖土有限元軟件Plaxis對實際工程采用分部開挖完成后的水平位移場及豎向位移場進行了數(shù)值模擬,并將計算結(jié)果與實際監(jiān)測結(jié)果進行了對比分析。特別是對基坑開挖完成后周邊地表沉降變形及坑壁土體水平變形的分布規(guī)律進行了比較研究。成果可為該地區(qū)同類工程提供參考。
[Abstract]:With the continuous development of social economy, the height of urban buildings increases continuously, which makes the excavation depth of foundation pit more and more deep, and because of the narrow site conditions, the surrounding buildings are dense, and there are underground pipelines. The requirement of stability and deformation of foundation pit is higher and higher. Therefore, it is difficult to meet the requirements of foundation pit design and construction in complex environment, and deformation is the main control condition in many projects. The construction of deep foundation pit works will cause the displacement of soil around the foundation pit, the uplift of the soil in the bottom of the pit, the settlement of the surrounding surface, and so on. If the deformation value is too large, the foundation pit will lose stability or endanger the surrounding buildings, underground pipelines and so on. Therefore, it is a useful method to avoid these accidents by making accurate deformation prediction analysis before foundation pit engineering construction and strengthening the position where there may be excessive deformation. Based on the foundation pit engineering of Changchun International Financial Center, and in view of the specific engineering conditions and site engineering geological conditions, and on the basis of analyzing the characteristics of various kinds of supporting structures, the paper puts forward a foundation pit supporting scheme suitable for the construction of this project. The detailed design calculation and stability analysis of the supporting structure are carried out. The horizontal displacement field and vertical displacement field after partial excavation were simulated by finite element software Plaxis, and the calculated results were compared with the actual monitoring results. Especially, the distribution of ground surface settlement and horizontal deformation of pit wall after excavation is compared. The results can provide reference for similar projects in this area.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：R725.4

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本文編號：2028822