本文選題：土釘墻 + 周邊環(huán)境��； 參考：《昆明理工大學(xué)》2017年碩士論文

【摘要】：本文以昆明市盤興博大基坑工程中的土釘墻支護剖面為研究對象,利用Midas/GTS有限元軟件建立了土體、土釘墻支護結(jié)構(gòu)和周邊環(huán)境相互作用的三維有限元模型。在此基礎(chǔ)上,分析了土釘?shù)膬A角、釘長、布置方式、密度和軟土層在基坑中的位置對土釘墻的變形及周邊環(huán)境的影響,最后研究了當(dāng)坑底為軟土?xí)r,增加土釘長度和不同預(yù)應(yīng)力值下的預(yù)應(yīng)力錨桿+土釘?shù)母倪M支護方式對土釘墻的變形及周邊環(huán)境的影響。主要工作和研究成果如下:(1)依據(jù)土釘墻工程實例利用Midas/GTS有限元軟件建立模型,模擬土釘墻的施工過程得出模擬結(jié)果。通過模擬值與監(jiān)測值對比驗證模型的可靠性,同時對土釘墻及周邊環(huán)境的變形結(jié)果進行分析。(2)土釘傾角在10°～30°區(qū)間內(nèi),傾角越小對變形控制越有利;在原支護結(jié)構(gòu)的釘長上增加4m后,土釘?shù)钠骄L度為基坑深度的1.15倍,達到了臨界長度,如果再增加土釘?shù)拈L度則土釘?shù)膬?nèi)力幾乎不發(fā)生變化,對控制變形的意義不大;在土釘總長度不變和土質(zhì)較好的情況下,長短相間的布置方式對變形控制最有利,中部較長次之,造成變形最大的是上長下短的布置方式;在考慮變形控制要求和經(jīng)濟節(jié)約的前提下,土釘?shù)拈g距在1.5m左右最優(yōu),當(dāng)土釘?shù)拈g距為0.5m時,出現(xiàn)了群釘效應(yīng),土釘密度過大也對變形控制非常不利。(3)厚度為2m的軟土層在基坑中的位置越靠下時對變形控制越不利,其中軟土的物理力學(xué)參數(shù)采用昆明地區(qū)典型的泥炭質(zhì)土參數(shù)。當(dāng)軟土層位于基坑底部時,單純靠增加土釘長度來控制土釘墻的變形效果沒有采用預(yù)應(yīng)力錨桿+土釘這種復(fù)合土釘墻的支護方式效果好。在一定預(yù)應(yīng)力值區(qū)間內(nèi)隨著預(yù)應(yīng)力的增加,對變形控制有積極的意義,當(dāng)錨桿的預(yù)應(yīng)力較大時,則加大錨桿作用范圍之外土體變形,對變形控制不利。
[Abstract]:In this paper, the soil nailing wall supporting section in Panxing big foundation pit engineering of Kunming City is taken as the research object, and the three-dimensional finite element model of soil mass, soil nailing wall supporting structure and surrounding environment is established by using Midas/GTS finite element software.On this basis, the effects of inclination, nail length, layout, density and the position of soft soil in foundation pit on the deformation and surrounding environment of soil nailing wall are analyzed. Finally, when the bottom of the pit is soft soil,The influence of the improved support mode of prestressed anchor soil nailing on the deformation and surrounding environment of soil nailing wall with increasing the length of soil nailing and different prestress values.The main work and research results are as follows: 1) based on the example of soil nailing wall engineering, the model is established by using Midas/GTS finite element software, and the simulation results are obtained by simulating the construction process of soil nailing wall.The reliability of the model is verified by comparing the simulated value with the monitoring value. At the same time, the deformation results of soil nailing wall and surrounding environment are analyzed. 2) the inclination angle of soil nail is in the range of 10 擄~ 30 擄, the smaller the inclination angle is, the more favorable the deformation control is.The average length of soil nailing is 1.15 times of the depth of foundation pit, which reaches the critical length after increasing the nail length of the original support structure by 4 m. If the length of soil nailing is increased, the internal force of soil nailing will hardly change, which is of little significance for controlling deformation.Under the condition that the total length of soil nailing is constant and the soil quality is good, the arrangement with long and short phases is the most favorable to the deformation control, and the middle part is the second, and the biggest deformation is the arrangement of the upper length and the lower part.Considering the requirements of deformation control and economic saving, the spacing of soil nailing is about 1.5 m. When the spacing of soil nailing is 0.5 m, the group nail effect appears.The higher the density of soil nailing is, the more disadvantageous is the deformation control of soft soil layer with thickness of 2m in foundation pit. The physical and mechanical parameters of soft soil are based on the typical peat soil parameters in Kunming area.When the soft soil layer is located at the bottom of the foundation pit, the deformation effect of the soil nailing wall is controlled simply by increasing the length of the soil nailing. The supporting effect of the composite soil nailing wall is better than that of the prestressed anchor soil nailing.With the increase of prestress, it has a positive significance for deformation control. When the prestress of anchor rod is large, the deformation of soil outside the range of anchor action will be increased, which will be disadvantageous to deformation control.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU753

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本文編號：1742910