本文關(guān)鍵詞：復(fù)雜地質(zhì)條件下深基坑的變形分析與預(yù)測　出處：《河北大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 深基坑 變形分析 基坑監(jiān)測 灰色模型 預(yù)測

【摘要】：隨著經(jīng)濟(jì)和社會(huì)的發(fā)展,城市建設(shè)用地越來越緊張,過去認(rèn)為不適合建設(shè)的土地不得不利用,同時(shí)隨著技術(shù)的進(jìn)步,樓房建設(shè)的越來越高,相對(duì)應(yīng)的基坑也越來越深,并且基坑周邊環(huán)境趨于復(fù)雜,由基坑開挖引起的重特大事故時(shí)有發(fā)生,造成了巨大的經(jīng)濟(jì)損失,因此對(duì)深基坑進(jìn)行監(jiān)測,做到信息化施工和管理顯得尤為重要。以處于巖溶和采空雙重不良地質(zhì)條件下的唐山某深基坑工程為背景,分析不同支護(hù)形式對(duì)深基坑變形的影響以及深基坑開挖階段與開挖完成至回填階段變形量之間的關(guān)系,并采用灰色模型對(duì)基坑變形進(jìn)行預(yù)測,探究維數(shù)、時(shí)間間隔與預(yù)測精度之間的關(guān)系,并得出以下結(jié)論:(1)開挖階段,兩種不同支護(hù)形式下的基坑坡頂水平位移差異較大,錨桿支護(hù)的坡頂水平位移大于排樁+錨桿支護(hù)的坡頂水平位移,而對(duì)基坑坡頂豎向位移影響很小。(2)開挖階段水平位移約占總變形量的68%~78%,坡頂豎向位移約占總變形量的61%~67%。(3)開挖階段,在坡頂水平位移的預(yù)測中,5維為最優(yōu)維數(shù),最優(yōu)時(shí)間間隔為5天。(4)開挖完成至回填階段,在坡頂水平位移的預(yù)測中,維數(shù)與間隔天數(shù)對(duì)預(yù)測結(jié)果的精度并無影響。
[Abstract]:With the development of economy and society, the urban construction land is more and more tense. The land that was considered unsuitable for construction has to be used in the past. At the same time, with the progress of technology, the building construction is getting higher and higher. The corresponding foundation pit is becoming deeper and deeper, and the surrounding environment of the foundation pit tends to be complex. The serious and serious accidents caused by the excavation of the foundation pit occur frequently, resulting in huge economic losses, so the monitoring of the deep foundation pit is carried out. Information construction and management is particularly important, with the background of a deep foundation pit project in Tangshan, which is under the double unfavorable geological conditions of karst and mining. This paper analyzes the influence of different supporting forms on the deformation of deep foundation pit and the relationship between the deformation of deep foundation pit and the period from excavation to backfill. The grey model is used to predict the deformation of foundation pit and explore the dimension. The relationship between time interval and prediction accuracy, and draw the following conclusion: 1) in the excavation stage, the horizontal displacement of the slope top of the foundation pit under two different support forms is quite different. The horizontal displacement of the roof of bolting is greater than that of the bolting with row piles, but the vertical displacement of the roof of foundation pit has little effect on the vertical displacement.) the horizontal displacement in excavation stage accounts for 68% or 78% of the total deformation. The vertical displacement of the top of the slope accounts for about 61% of the total deformation at the excavation stage. In the prediction of the horizontal displacement at the top of the slope, the optimal dimension is 5 dimensions. The optimal interval is 5 days. 4) the excavation is completed to the backfill stage. In the prediction of the horizontal displacement of the slope, the dimension and the interval days have no effect on the accuracy of the prediction results.
【學(xué)位授予單位】：河北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU753

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