本文選題：軟土地區(qū) + 深基坑��； 參考：《北京交通大學》2017年碩士論文

【摘要】：隨著中國經(jīng)濟的快速發(fā)展,城市空間越來越緊張,三維城市空間已經(jīng)開始成為重要的自然資源�？梢哉f,地下空間的開發(fā)利用是二十一世紀城市建設的方向。二十一世紀以來,中國城市地鐵建設發(fā)展迅速。深基坑工程是一個復雜的跨學科領域,與許多因素相關,是系統(tǒng)工程,雖然國內(nèi)外專家學者對深基坑工程進行了廣泛的深入研究,取得了一些成功的經(jīng)驗,但理論尚不成熟。深基坑事故主要有兩個問題:一是深基坑支護系統(tǒng)不穩(wěn)定;二是深層開挖環(huán)境條件,周圍既有設施的安全問題,甚至導致嚴重的工程事故。本文的主要內(nèi)容如下:(1)總結了基坑工程穩(wěn)定性及變形的研究現(xiàn)狀,介紹了基坑變形規(guī)律及支護結構與外圍土層的變形關系。(2)介紹了基坑變形的理論分析,并總結了基坑隆起和空間效應的理論知識。(3)通過有限元數(shù)值計算研究了長寬比對基坑空間效應的影響,并通過空間效應驗算基坑開挖優(yōu)化方案的可行性;分析了基坑隆起變形產(chǎn)生的原因,并通過數(shù)值計算研究基坑隆起的影響因素。(4)通過數(shù)值計算模擬蘇州太湖新城核心區(qū)地下空間工程,計算出數(shù)值計算結果,并與現(xiàn)場監(jiān)測數(shù)據(jù)進行了分析對比。得出主要結論如下:(1)當基坑長寬比L/B小于2時,按考慮空間效應的方法進行基坑的設計與施工較為經(jīng)濟;而當長寬比L/B大于2時,按二維平面問題進行分析則更為簡單、安全。(2)根據(jù)太沙基假定,推導了基底隆起影響范圍寬度的計算公式,由公式可以看出,基底隆起影響范圍寬度的大小主要受到基坑墻體嵌固深度和寬度、土性參數(shù)內(nèi)摩擦角的影響。(3)由數(shù)值模擬計算出的變形規(guī)律和結果可以用來預測在軟土地區(qū)的基坑變形。
[Abstract]:With the rapid development of Chinese economy, urban space is becoming more and more tense, 3D urban space has become an important natural resource. It can be said that the development and utilization of underground space is the direction of urban construction in the 21 th century. Since the 21 century, China's urban subway construction has developed rapidly. Deep foundation pit engineering is a complex interdisciplinary field, which is related to many factors and is a system engineering. Although experts and scholars at home and abroad have made extensive and in-depth research on deep foundation pit engineering, some successful experiences have been obtained, but the theory is not yet mature. There are two main problems in deep foundation pit accidents: one is the instability of deep foundation pit support system, the other is the environmental conditions of deep excavation, the safety problems of existing facilities around it, and even serious engineering accidents. The main contents of this paper are as follows: (1) the research status of foundation pit engineering stability and deformation is summarized, and the deformation law of foundation pit and the relationship between supporting structure and surrounding soil layer are introduced. (2) the theoretical analysis of foundation pit deformation is introduced. The theoretical knowledge of uplift and spatial effect of foundation pit is summarized. (3) the influence of aspect ratio on spatial effect of foundation pit is studied by finite element numerical calculation, and the feasibility of optimization scheme of excavation is verified by space effect. The causes of foundation pit uplift deformation are analyzed, and the influencing factors of foundation pit uplift are studied by numerical calculation. (4) the numerical calculation results are obtained by simulating the underground space engineering in the core area of Taihu New City in Suzhou. And compared with the field monitoring data. The main conclusions are as follows: (1) when the aspect ratio of foundation pit L / B is less than 2, it is more economical to design and construct the foundation pit according to the method of considering the spatial effect, but when the ratio of length to width is greater than 2, it is easier to analyze the two-dimensional plane problem. (2) based on the Taishaji assumption, the formula for calculating the width of the influence range of the base uplift is derived. It can be seen from the formula that the width of the influence area of the base uplift is mainly affected by the embedded depth and width of the wall of the foundation pit. (3) the deformation law and results calculated by numerical simulation can be used to predict the deformation of foundation pit in soft soil area.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU473

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