本文關鍵詞：杭州軟土地區(qū)淺埋大斷面隧道施工對地層豎向變形的影響分析　出處：《浙江工業(yè)大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： CRD工法 地表沉降 深層沉降 縱向地表沉降 預測公式

【摘要】：本文在前人研究工作的基礎上,采用理論研究、數(shù)值模擬和現(xiàn)場試驗相結(jié)合的方法初步分析了杭州市軟土地區(qū)淺埋大斷面隧道施工的地層豎向變形規(guī)律,主要的內(nèi)容和結(jié)論如下:1、利用有限元軟件ABAQUS分析了CRD工法施工時不同開挖步對地層變形的影響,得出在CRD工法中,第一部開挖地表沉降最大值就遠超30mm;其次,對CRD工法、CD工法、臺階工法的豎向變形進行研究,得出地表沉降最大值的大小關系為:臺階工法CD工法CRD工法;最后,分析CRD工法的三種施工工況下的豎向變形,得到錯開開挖將有利于控制地層變形。2、模擬不同軸線埋深、不同間距情況下的雙線隧道開挖,得出地表沉降規(guī)律;利用水平距離系數(shù)C值判斷地表變形曲線形態(tài)是單峰還是雙峰;其次,通過分析沉降槽寬度,得出在大斷面隧道中,地表沉降槽寬度可以利用分段函數(shù)進行表示。同時,通過對地表最大值的修正,得出雙線地表沉降公式。將預測公式計算值與有限元值對比,發(fā)現(xiàn)兩者接近。3、對雙線隧道的深層沉降進行分析,得出深層沉降規(guī)律。其次,結(jié)合Mair公式對深層沉降槽寬度、深層最大值進行修正,并結(jié)合Peck的雙線疊加公式的方法得出雙線深層沉降公式。最后,將預測公式計算值與有限元值對比,發(fā)現(xiàn)兩者接近。4、分析雙線淺埋大斷面隧道地表縱向變形,得出縱向地表沉降規(guī)律,并得出在z/D(軸線埋深/等效直徑)不同的情況下的淺埋暗挖縱向地表沉降公式。5、利用監(jiān)測數(shù)據(jù)分析地表沉降、深層沉降、拱頂沉降規(guī)律,并將監(jiān)測數(shù)據(jù)與有限元值及預測公式進行對比分析;預測公式在總體趨勢和規(guī)律上與監(jiān)測數(shù)據(jù)相似,且數(shù)值差距在20%以內(nèi);預測公式可以初步應用于隧道的地層豎向變形預測。
[Abstract]:On the basis of previous research work, the vertical deformation law of shallow buried large section tunnel in soft soil area of Hangzhou is analyzed preliminarily by the method of theoretical study, numerical simulation and field test. The main contents and conclusions are as follows: 1. By using the finite element software ABAQUS, the influence of different excavation steps on the formation deformation during the construction of CRD construction method is analyzed, and the result is obtained in the CRD construction method. In the first part, the maximum value of surface subsidence is far more than 30mm; Secondly, the vertical deformation of CRD method and step method are studied, and the relation of the maximum value of surface subsidence is obtained as follows: step method, CD method, CRD method; Finally, the vertical deformation under three construction conditions of CRD method is analyzed, and it is found that staggered excavation will be beneficial to control the formation deformation of 0.2 and simulate the excavation of double-line tunnel with different axis depth and different spacing. The law of surface subsidence is obtained. The horizontal distance coefficient C value is used to judge whether the shape of surface deformation curve is single peak or double peak. Secondly, by analyzing the width of settlement trough, it is concluded that in large section tunnel, the width of surface settlement trough can be expressed by subsection function. At the same time, through the correction of the maximum value of surface. The calculation value of the prediction formula is compared with the finite element value, and it is found that both of them are close to .3. the deep settlement of the double-line tunnel is analyzed, and the law of deep settlement is obtained. Combined with Mair formula, the width and maximum value of deep settlement trough are modified, and combined with Peck's double-line superposition formula, the double-line deep settlement formula is obtained. Finally. By comparing the calculated value of prediction formula with the value of finite element, it is found that the two values are close to .4. the longitudinal deformation of tunnel surface with shallow and large section is analyzed, and the law of longitudinal surface subsidence is obtained. And under the condition of different z / D (axis buried depth / equivalent diameter), the vertical surface subsidence formula. 5. The law of surface subsidence, deep settlement and dome settlement are analyzed by monitoring data. The monitoring data are compared with the finite element value and the prediction formula. The prediction formula is similar to the monitoring data in general trend and law, and the numerical difference is less than 20%; The prediction formula can be applied to the vertical deformation prediction of the tunnel.
【學位授予單位】：浙江工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U455

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相關期刊論文 前1條

1 申林方;王志良;謝建斌;;基于邊界配點法淺埋隧道開挖引起周圍土體變形的分析[J];巖土力學;2012年S2期

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本文編號：1399833