本文選題：深基坑　切入點：ABAQUS　出處：《安徽理工大學》2014年碩士論文

【摘要】：本文首先利用深基坑變形機理清楚的揭示墻體變形、基坑底部隆起、墻后地表沉降三者之間變形現(xiàn)象的原因,由此,可得出三者之間的變形是相互聯(lián)系的：擋土墻內(nèi)外側(cè)土壓力差使其產(chǎn)生向坑內(nèi)方向的變形,導致墻后土體產(chǎn)生了豎向位移；坑底部土體原始應力狀態(tài)因垂直卸載而回彈,產(chǎn)生了以向上為主的位移,導致坑底土體隆起。文中用正態(tài)分布概率密度函數(shù)描繪通過最大下沉點剖面的地表沉降曲線和由最小二乘法求得的擋土墻側(cè)向位移擬合曲線,利用二者之間的函數(shù)關系推導出任意點最大沉降值的計算公式,這對預測基坑周圍土體沉降大小和地下管道的變形有著重要的作用。采用ABAQUS模擬了土釘—樁錨支護,更直觀的分析不同開挖層面土釘及錨桿內(nèi)力和樁體位移。結(jié)果證明：樁體的側(cè)向位移逐漸減小,并呈下降趨勢,土釘—樁錨支護對改善基坑變形控制起到了重要的作用。 本文還介紹了不同的支護類型。在現(xiàn)實工程中可根據(jù)基坑深度、周圍環(huán)境、地質(zhì)水文、經(jīng)濟等綜合考慮,選擇合適的支護結(jié)構(gòu),為深基坑工程提供安全和穩(wěn)定。結(jié)合淮北市金鷹商廈基坑支護的工程實例,詳細介紹該工程土釘—樁錨支護設計方案及工藝,并對測點進行沉降監(jiān)測：地面沉降觀測點的變形率逐漸降低,基坑處于穩(wěn)定狀態(tài)。
[Abstract]:In this paper, the deformation mechanism of deep foundation pit is first used to reveal the causes of deformation between wall deformation, bottom uplift of foundation pit and surface settlement behind wall. It can be concluded that the deformation between the three is interrelated: the difference of the earth pressure inside and outside the retaining wall causes the deformation in the direction of the pit, which results in the vertical displacement of the soil behind the wall, and the original stress state of the soil in the bottom of the pit bounces back because of the vertical unloading. In this paper, the surface settlement curve of the maximum subsidence point profile and the lateral displacement fitting curve of the retaining wall obtained by the least square method are described by normal distribution probability density function. The calculation formula of maximum settlement value at any point is deduced by using the function relation between them, which plays an important role in predicting the settlement of soil around foundation pit and the deformation of underground pipeline. The soil nailing and pile anchor support are simulated by ABAQUS. The results show that the lateral displacement of the pile decreases gradually and shows a downward trend. Soil nail-pile anchor support plays an important role in improving the deformation control of foundation pit. This paper also introduces different types of support. According to the comprehensive consideration of the depth of foundation pit, surrounding environment, geology and hydrology, economy and so on, the suitable supporting structure can be selected in practical engineering. To provide safety and stability for deep foundation pit engineering, this paper introduces the design scheme and technology of soil nail-pile anchor support in detail according to the engineering example of foundation pit support of Jinying commercial building in Huaibei City. The deformation rate of the ground subsidence observation point decreases gradually and the foundation pit is in a stable state.
【學位授予單位】：安徽理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU753

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