本文選題：黃土地區(qū) + SMW工法　； 參考：《西安科技大學(xué)》2017年碩士論文

【摘要】：本文通過型鋼-水泥土組合梁試驗(yàn),研究了型鋼與水泥土共同作用關(guān)系、加載過程中組合梁的抗彎剛度變化規(guī)律、組合梁的抗彎承載力和破壞模式等問題;基于彈性支點(diǎn)法給出了基坑支護(hù)結(jié)構(gòu)的位移及內(nèi)力計(jì)算公式,并將西安某基坑支護(hù)工程實(shí)例的理論計(jì)算結(jié)果與FLAC3D模擬及現(xiàn)場實(shí)測結(jié)果進(jìn)行了對比,研究了黃土地區(qū)SMW工法基坑圍護(hù)結(jié)構(gòu)設(shè)計(jì)理論與變形規(guī)律。論文的主要工作與結(jié)論如下:(1)通過型鋼-水泥土組合梁的試驗(yàn)研究可以得出以下結(jié)論:組合梁工作過程經(jīng)歷共同作用、型鋼單獨(dú)作用兩個階段,組合梁在不同階段裂縫開展、型鋼應(yīng)變變化及組合剛度的變化表現(xiàn)出顯著的差異;不同的受力狀態(tài)下組合梁的剛度、承載力及破壞性狀存在較大差異。水泥土的包裹作用有利于對組合梁中型鋼的穩(wěn)定和承載性能的發(fā)揮,使組合梁表現(xiàn)出較好的延性,水泥土對型鋼的約束作用越強(qiáng)其承載力和變形能力越強(qiáng);在進(jìn)行實(shí)際工程設(shè)計(jì)計(jì)算時當(dāng)墻體變形較小,水泥土較完整對組合結(jié)構(gòu)剛度提高作用較大,可采用本文給出的公式進(jìn)行組合梁剛度計(jì)算;當(dāng)墻體變形較大時,水泥土開裂嚴(yán)重退出工作,由型鋼單獨(dú)承擔(dān)荷載此時不應(yīng)考慮水泥土的貢獻(xiàn)。(2)基于彈性支點(diǎn)法并結(jié)合結(jié)構(gòu)水平位移疊加原理,給出了支護(hù)位移及內(nèi)力計(jì)算公式,并對西安某基坑工程實(shí)例進(jìn)行了計(jì)算,結(jié)果表明:計(jì)算與實(shí)測的支護(hù)結(jié)構(gòu)水平位移均呈“S形”發(fā)展,本文計(jì)算方法所得到的支護(hù)結(jié)構(gòu)水平位移規(guī)律可為類似工程設(shè)計(jì)提供參考。(3)以西安某深基坑工程為背景,采用FLAC3D數(shù)值模擬軟件,分析了基坑各開挖工況下水平位移變化規(guī)律并與實(shí)際監(jiān)測數(shù)據(jù)進(jìn)行對比,得到兩者變化規(guī)律相似。另外分析了基坑的周邊環(huán)境沉降及基底隆起規(guī)律發(fā)現(xiàn):基坑周邊沉降出現(xiàn)出現(xiàn)“勺狀”分布,最大的沉降值并非發(fā)生在基坑邊緣,沉降量和影響范圍均較小;在整個開挖過程基底坑底隆起量較小,表明圍護(hù)樁對樁后土體的變形有較大的限制,研究結(jié)論對黃土地區(qū)SMW工法設(shè)計(jì)施工有借鑒意義。
[Abstract]:In this paper, through the test of steel cement soil composite beam, the joint action relation of type steel and cement soil, the change law of bending stiffness of composite beam, bending bearing capacity and failure mode of composite beam during loading process are studied, and the calculation formula of displacement and internal force of foundation pit supporting structure is given based on elastic branch method, and a foundation pit branch in Xi'an is used. The theoretical calculation results of the case of the protection engineering are compared with the FLAC3D simulation and the field measured results. The design theory and deformation law of the foundation pit enclosure structure in the loess area are studied. The main work and conclusion of the paper are as follows: (1) the following conclusions can be obtained by the experiment of the steel cement soil composite beam through the model: the working process of the composite beam can be obtained. As a result of the joint action, the type steel has two stages separately. The composite beam is carried out in different stages, the strain change and the combination stiffness change significantly. The stiffness, bearing capacity and failure characteristics of the composite beams are different. The wrapping effect of cement soil is beneficial to the stability of the medium steel. The combination beam shows better ductility. The stronger the binding effect of the cement soil to the type steel, the stronger its bearing capacity and the deformation ability. In the actual engineering design calculation, when the wall deformation is small, the cement soil is more complete to the composite structure stiffness, and the formula given in this paper can be used to carry on the composite beam. Stiffness calculation; when the wall deformation is large, the cracking of cement soil is seriously out of work, and the contribution of cement soil should not be considered at this time. (2) the calculation formula of support displacement and internal force is given based on the elastic fulcrum method combined with the superposition principle of structural horizontal displacement, and the results of a foundation pit project in Xi'an are calculated and the results are calculated. The results show that both the calculated and measured horizontal displacement of the supporting structure are "S". The horizontal displacement law of the supporting structure obtained by this method can provide reference for similar engineering design. (3) taking a deep foundation pit in Xi'an as the background, the FLAC3D numerical simulation software is used to analyze the change law of horizontal displacement under each excavation condition of the foundation pit. And compared with the actual monitoring data, it is found that the law of the two changes is similar. In addition, it is found that the surrounding settlement of the foundation pit and the regularity of the basement uplift found that the "spoon" distribution appears in the surrounding settlement of the foundation pit, and the maximum settlement value is not on the edge of the foundation pit, the settlement amount and the influence range are small, and the foundation pit in the whole excavation process is in the base pit. The bottom uplift is small, which indicates that the retaining piles have great limitations on the deformation of the soil behind the pile. The research conclusions can be used for reference in the design and construction of the SMW method in the loess area.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU444;TU473

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