深基坑雙層環梁內支撐支護結構變形研究(含CAD圖)

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深基坑雙層環梁內支撐支護結構變形研究(含CAD圖)(任務書,開題報告,外文翻譯,論文計算書40000字,CAD圖6張合一)
摘要
近些年來,隨著城市建設的快速發展,我國建筑業發展十分迅速,地下室、地下車庫以及地鐵車站等地下工程施工也越來越普遍,基坑支護工程已逐漸引起專家學者的關注。環梁式支護結構是近些年來新出現的一種基坑支護結構形式,具有受力性能合理、經濟效益好等優點,在基坑支護領域備受青睞,但目前環梁式支護結構的設計計算還存在一些不合理之處,有待解決。
本文闡述了環梁式支護結構的研究現狀;分析了環梁支護結構的優越性及存在的問題;對基坑支護設計的基本理論和方法進行總結;以武漢中勝村C地塊基坑工程為例,用“天漢”系列基坑工程設計軟件,對環梁內支撐系統進行設計計算。探討了雙層環梁內支撐設計計算的幾個關鍵問題,包括水平支撐豎向位置的布置;對三種不同內支撐布置方案的分析;環梁中心點飄移的控制;基坑四周荷載不均衡情況下,內支撐結構邊界“約束點”的選擇;環梁內支撐水平剛度系數的計算;基坑支護結構分算方法存在的問題及分算方法與整體分析方法的比較等。
本文的創新點在于:①對于雙層環梁內支撐,通過控制支撐體系的其他條件不變,只調整第二道支撐豎向位置的方法,對豎向支護樁和水平內支撐的內力、位移進行計算分析,得到第二道支撐豎向位置選擇的相關結論;②通過局部加強內支撐結構的剛度,對環梁的受力、變形進行計算分析,得到減小環梁變形、控制環梁中心點飄移的相關結論;③用平面計算軟件和三維計算軟件分別對同一工程進行設計計算,通過對比分析,總結出基坑支護設計分算方法與整體分析方法各自的適用情況。
通過分析總結,得到以下主要結論及成果:
(1)對于雙層環梁式內支撐,適當降低第一道支撐豎向位置和調整兩道支撐間距,有利于減小豎向支護樁的樁身最大位移和彎矩,且能夠使兩道支撐的支撐軸力更加接近,有益于整個支撐體系的穩定,使支撐體系的受力效果更好。
(2)對于四周土壓力荷載分布不均的基坑,局部加強水平內支撐的剛度較弱處、傳力路徑單一處、受外荷載較大處的剛度,有利于減小環梁變形和對環梁中心點飄移的控制,其中局部加強內支撐受外荷載較大處剛度的效果最明顯。
(3)內支撐結構邊界“約束點”的選擇,應使引入約束支座后的內支撐結構的位移狀態與實際相符,約束支座應設置在位移為0的位置與方向上,其支座反力理論上應為0。用“天漢”軟件對四周土壓力荷載分布明顯不均的基坑進行計算時,若支撐位移圖變形過大,需對其進行整體平衡判斷,并反復調整土壓力荷載值和設置不同的邊界約束,直至位移支撐圖為實際中可能的變形為止,否則計算出的內支撐位移和內力值不夠準確。
(4)基坑支護結構分算方法雖然存在一些不合理之處,但在基坑周圍土壓力荷載均衡的條件下,采用分算方法和整體分析方法對支護結構進行設計計算的結果較接近,且分算方法計算經驗豐富,其計算結果的準確性更有保證,應優先選用分算方法;當基坑周圍土壓力荷載不均衡時,采用分算方法易出現環梁中心點飄移問題,且內支撐邊界約束支座難以確定,其計算結果誤差較大,而整體分析方法不存在這些問題,應優先選用整體分析方法進行設計計算。
關鍵詞:基坑支護;環梁內支撐;邊界約束;中心點飄移
 
Abstract
In recent years, with the rapid development of urban construction. China's construction industry developed rapidly. Basement, underground garages and subway stations, as well as underground construction is becoming more and more common. Foundation pit support engineering gradually caught the attention of experts and scholars. Ring beam supporting structure is emerging in recent years, a form of foundation pit support structure. It has the advantages of mechanical properties and good economic returns, it is popular in the field of foundation pit support. But there are some unreasonable of the design of ring beam supporting structure, to be resolved.
The status quo and problems of a pit ring beam to support retaining structure is described, and the superiority of the ring beam retaining structure is analysed in this article. The basic theory and method for design of foundation pit supporting is summarized; Combination the C block of Wuhan zhongsheng village foundation pit, the ring beam bracing system is designed and calculated by “TianHan” series of excavation engineering design software. The designation and calculation for double ring beam support are discussed in several key problems, including the vertical location arrangements of horizontal support; Analysis of three different layout of internal bracing structure; The control of ring beam focal point drift; The choice of internal bracing's constraint points in foundation pit surrounded by uneven load; The calculation of horizontal stiffness coefficient of ring beam supporting; The problems of split method to foundation pit support structure and the comparison of split method and integral analysis method etc.
Innovation of this paper : ① For two-tier ring beam supported by control support system of other conditions do not change, only adjust the vertical positions of the second beam supported. On vertical piles and lateral bracing analysis of internal forces and displacements are calculated, and the relevant conclusions of the vertical positions of second choice is drew. ② Through the local reinforcement of rigidity of bracing structure, the force and deformation of ring beam are calculated and analysed, and come to the conclusion which is relevant to the reducing deformationof ring beam and the controlling focal point drift of ring beam. ③ Calculation software for two dimensional and three dimensional are used for the same project to design. Through comparison and analysis, summarizes the applicable to split method and integral analysis method.
Through analysis and summary the following key conclusions and results are reached:
(1) For two-tierring beam bracing, reducing the vertical positions of first beam bracing appropriately and adjusting the spacing between two internal bracing is good to decrease the maximum value of vertical pile displacement and bending moment, and it also can make closer to supporting axial force of the two beam bracing, it’s benefit to the stability of the whole support system and make the supporting system load better.
(2) To uneven distribution of earth pressure loads for a excavation, local strengthening the stiffness where the horizontal supporting stiffness is weak, load paths is only one and the under external loads is bigger. it's good to reduce the deformation of ring beam and the control of ring beam focal point drift. Where the effect of local strengthening of stiffness of under external loads larger is most pronounced.
(3) The choice for the boundary constraint points of support structure should make the displacement of supporting structure in line with the actual, and the constraints support should be set on the position and direction of the displacement is 0, The reaction force of the constraints support should be 0 in theory. The foundation pit arounded uneven load by “TianHan” series of excavation engineering design software is calculated, if the distortion of displacement diagram is too large, the total balance needs to determine, and repeatedly adjusted the earth pressure load and calculation until the displacement diagram of internal bracing is consistent with the actual, otherwise the calculated internal displacements and internal forces is inaccurate.
(4) Although there are some unreasonable in split method, but when the soil pressure around the excavation is balanced, the results of support structure design and calculation by split method and integral analysis method is near, and the split method is experienced, it should be preferred. When the soil pressure around the excavation is unbalanced, split method maybe have the problem of circular beam focal point drift, and the boundary constraint points of support structure is difficult to determine, and it’s results not accurate enough, but integral analysis method does not have these problems, so the integral analysis method should be used firstly.
Key words: retaining and protecting for foundation pit; ring beam bracing; boundary constraint; focal point drift

本文主要工作內容:
(1)闡述環梁式內支撐的研究現狀及基本概念。
(2)簡述基坑支護設計計算的基本理論與方法。以武漢中勝村C地塊基坑工程為例,利用“天漢”系列基坑工程設計軟件進行設計計算,包括對上部放坡的穩定性驗算、鉆孔灌注樁排樁的設計計算、內支撐結構體系(冠梁、圍囹、環梁、輻射撐、角撐、立柱等)的設計計算,并分析了該工程內支撐的施工工況、換撐設計和地下水處理設計等。
(3)結合武漢中勝村C地塊基坑工程實例,探討了雙層環梁內支撐設計計算的幾個關鍵問題,包括水平支撐豎向位置的布置;對三種不同的內支撐布置方案的分析;環梁中心點飄移的控制;基坑四周荷載不均衡情況下內支撐結構邊界“約束點”的選擇;環梁內支撐水平剛度系數的計算;環梁支護結構受到偏心壓力荷載的作用;基坑支護結構分算方法存在的問題及分算方法與整體分析方法的比較等。

工程概況
武漢中勝村C地塊位于武漢市江岸區建設大道以西,空軍雷達學院體育館以東,包括1棟高層辦公樓(39層)、1棟3層商業樓及整體地下車庫(負3層),規劃總用地面積10230m2,總建筑面積約80387.95m2。結構類型:39層塔樓為核心筒結構,商業裙樓和地下室為框架結構,其中塔樓高度為147.65m,3層商業裙樓高度約14.45m,地下車庫建筑面積約18189.85m2,三層地下車庫高度約為10.8m。
工程設計±0.00=23.35m(以下標高如不說明,均為相對±0.00的標高)。基坑形狀近似扇形,如圖4.1,場地絕對標高平均約為23.05和22.65m(相對標高-0.30m/-0.70m)。基坑以地下室外墻線外擴1.50m為基坑底邊線,地下室基坑底邊線支護面積約為6604.5m2左右,支護周長約為319.2m左右。
 

深基坑雙層環梁內支撐支護結構變形研究(含CAD圖)
深基坑雙層環梁內支撐支護結構變形研究(含CAD圖)
深基坑雙層環梁內支撐支護結構變形研究(含CAD圖)
深基坑雙層環梁內支撐支護結構變形研究(含CAD圖)
深基坑雙層環梁內支撐支護結構變形研究(含CAD圖)


目錄
摘要    I
Abstract    III
第1章 緒論    1
1.1概述    1
1.2基坑工程支護的主要類型    1
1.3深基坑環梁支護結構的研究現狀    2
1.4本文工作內容    3
第2章 環梁內支撐結構的基本概念    4
2.1環梁內支撐結構的發展    4
2.2環梁內支撐結構的特點    4
2.3環梁內支撐結構的構造    5
2.4環梁內支撐結構的平面布置    6
第3章 基坑支護設計的基本理論與方法    7
3.1作用于支護結構上的荷載    7
3.1.1土壓力理論    7
3.1.2水平荷載計算    9
3.1.3水平抗力計算    10
3.2支護結構設計計算理論    10
3.2.1靜力平衡法    10
3.2.3等值梁法    11
3.2.3彈性抗力法    12
3.3支撐、錨桿水平剛度系數的確定    13
3.4多層支撐支護結構等值梁法的計算    14
第4章 武漢中勝村C地塊基坑工程實例    17
4.1工程概況    17
4.1.1周邊環境概況    18
4.1.2工程地質條件    18
4.1.3水文地質條件    21
4.2基坑支護方案的選擇    22
4.2.1基坑特點分析    22
4.2.2支護方案比選    22
4.3基坑支護設計    23
4.3.1基坑設計依據    23
4.3.2基坑設計原則    24
4.3.3基坑支護設計參數確定    24
4.3.4設計計算模型    24
4.3.5總體支護方案布置    25
4.3.6上部支護設計    25
4.3.7鉆孔灌注樁排樁設計    28
4.3.8內支撐結構設計    36
4.3.9內支撐施工工況    76
4.3.10換撐設計    77
4.3.11隔水(滲)帷幕設計    77
4.3.12樁間高壓旋噴樁加固設計    77
4.4地下水處理設計    78
4.4.1地下水控制設計原則    78
4.4.2設計思路    78
4.4.3基坑排水設計    78
4.5小結    81
第5章 雙層環梁內支撐設計計算的幾點探討    82
5.1水平支撐豎向位置的討論    82
5.1.1四種樁-撐支護方案參數信息    82
5.1.2計算結果比較分析    82
5.2環梁中心點飄移的控制    86
5.2.1三種內支撐結構方案參數信息    86
5.2.2計算結構比較分析    87
5.3內支撐結構邊界“約束點”的選擇    91
5.4環梁支護結構的水平剛度系數    93
5.5基坑支護結構分算方法存在的幾個問題    94
5.6基坑支護分算方法與整體分析方法的比較    94
5.6.1空間有限元數值模擬計算    95
5.6.2分算方法與整體空間分析方法的比較    99
5.7小結    100
第6章 結論和展望    102
6.1結論    102
6.2展望    103
參考文獻    105
附錄A    107

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