【摘要】：在地下空間的建設中,盾構法是一種不可或缺的施工方法,應用相當廣泛。盾構法施工雖然對上覆土層的擾動比較小,但是仍然不可避免地對周圍土體產生擾動,進而引起土體變形,導致一系列的環(huán)境工程問題。本文采用理論分析法與實測分析法對盾構掘進引起的土體變形以及建筑物沉降計算方法進行了研究。本文主要創(chuàng)新工作如下:(1)盾構隧道施工引起的土體變形方面,主要包括:1)對盾構法隧道統(tǒng)一土體移動模型二維解公式進行修正,利用修正公式預測近距離雙線平行盾構施工引起的總的地面沉降。該方法適用于雙線隧道近距離工況,因此對近距離的界定公式進行了研究。2)考慮多因素(土體損失、正面附加推力、盾殼摩擦力、附加注漿力)的作用下,建立力學計算模型,對雙線水平平行盾構施工引起的土體變形計算方法進行研究。由于后行隧道沉降槽偏移量b值可以反映先行隧道開挖對后行隧道施工的影響,對5例21個實測數據的統(tǒng)計結果進行分析,并對b值取值進行了研究。(2)盾構隧道施工引起的建筑物沉降方面,主要包括:1)盾構施工穿越上部既有建筑物時,形成的沉降槽與無建筑物時存在明顯差異。本文采用盾構法隧道統(tǒng)一土體移動模型解,考慮建筑物基礎剛度、基礎埋深及后行隧道施工引起的土體沉降曲線不對稱,對歐陽文彪解進行了修正,并將二維解拓展到了三維解。同時,對建筑物的工后沉降進行了計算。2)假定建筑物為彈性地基梁,提出一種考慮建筑物剛度對建筑物沉降影響條件下,對建筑物沉降曲線進行預測的實用方法。根據統(tǒng)一土體移動模型解計算出不考慮建筑物情況下盾構施工引起的地面沉降,然后根據彈性地基梁理論將該地面沉降轉換為作用在彈性地基梁上的沉降反力。通過MIDAS-GEN有限元軟件,將該沉降反力施加于彈性地基梁上,最后計算出考慮建筑物剛度情況下建筑物的沉降值。通過3個工程實例對本文方法進行驗證,同時根據算例對隧道與建筑物位置相對關系、基床系數k值以及建筑物剛度EI對建筑物沉降的影響進行了分析。
[Abstract]:In the construction of underground space, shield method is an indispensable construction method, which is widely used. Although the shield method construction has little disturbance to the overlying soil, it still inevitably disturbs the surrounding soil, and then causes the deformation of the soil, which leads to a series of environmental engineering problems. In this paper, the method of calculating the deformation of soil and the settlement of buildings caused by shield tunneling is studied by means of theoretical analysis and measured analysis. The main innovations of this paper are as follows: (1) the deformation of soil caused by shield tunnel construction mainly includes: 1) modifying the two-dimensional solution formula of unified soil movement model of shield tunneling. The modified formula is used to predict the total land subsidence caused by the parallel shield construction. This method is suitable for the short distance working condition of double track tunnel, so the definition formula of close distance is studied. 2) considering the action of many factors (soil loss, frontal additional thrust, shield shell friction, additional grouting force), A mechanical calculation model was established to study the calculation method of soil deformation caused by double line horizontal and parallel shield construction. Because the deviation b of the settlement trough of the rear tunnel can reflect the influence of the tunnel excavation on the construction of the tunnel, the statistical results of 21 measured data of 5 cases are analyzed. And the value of b value has been studied. (2) the settlement of the building caused by shield tunnel construction mainly includes: 1) when the shield tunneling works through the upper existing buildings, there is obvious difference between the settlement trough formed and the one without building. In this paper, the uniform soil movement model of shield tunneling is used to modify Ouyang Wenbiao's solution, considering the stiffness of building foundation, the depth of foundation and the asymmetry of soil settlement curve caused by tunnel construction. The two-dimensional solution is extended to the three-dimensional solution. At the same time, the post-construction settlement of the building is calculated. 2) assuming that the building is an elastic foundation beam, a practical method to predict the settlement curve of the building considering the influence of the building stiffness on the settlement of the building is put forward. According to the unified soil movement model, the ground settlement caused by shield construction without consideration of buildings is calculated, and then the ground settlement is converted into the settlement reaction force acting on the elastic foundation beam according to the elastic foundation beam theory. The settlement reaction force is applied to the beam on the elastic foundation by MIDAS-GEN finite element software. Finally, the settlement value of the building considering the stiffness of the building is calculated. The method is verified by three engineering examples, and the influence of the relative relationship between the tunnel and the building position, the coefficient k of the foundation bed and the stiffness of the building EI on the settlement of the building is analyzed.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U455.43;TU433

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本文編號：2313419