【摘要】：目前,在深基坑工程中常規(guī)的支護(hù)方法運(yùn)用較多,由于不能被再次利用,浪費(fèi)了許多建筑材料。“兩墻合一”指地下連續(xù)墻既作為地下室外墻起到豎向承重作用,又作為擋土、防滲支護(hù)結(jié)構(gòu),它已經(jīng)在實(shí)際中已經(jīng)被廣泛使用,但是它具有原來臨時(shí)支護(hù)結(jié)構(gòu)體系和作為永久結(jié)構(gòu)的受力變形特性;土壓力是作用在支護(hù)結(jié)構(gòu)的主要荷載,對支護(hù)結(jié)構(gòu)受力和變形的作用不言而喻。系統(tǒng)的研究“兩墻合一”支護(hù)結(jié)構(gòu)的變形和土壓力對工程的設(shè)計(jì)和施工具有重要的指導(dǎo)意義。本文以昆明同德廣場A7地塊基坑工程為背景,利用有限元軟件建立土、結(jié)構(gòu)和周圍環(huán)境共同作用的三維有限元模型,對該基坑施工過程進(jìn)行了模擬分析,計(jì)算結(jié)果與實(shí)際監(jiān)測數(shù)據(jù)基本一致,說明了該分析模型具有可靠性,并對數(shù)值模擬結(jié)果進(jìn)行了詳細(xì)的分析。主要的內(nèi)容和結(jié)論有:(1)在前人研究的基礎(chǔ)上,建立了位移-土壓力計(jì)算公式,在非圓礫類較堅(jiān)硬土?xí)r,計(jì)算的土壓力與數(shù)值模擬結(jié)果比較接近,能為類似基坑設(shè)計(jì)時(shí)提供一定的參考價(jià)值。(2)連續(xù)墻側(cè)移曲線由懸臂式向凸形轉(zhuǎn)變,最大側(cè)移值與對應(yīng)工況開挖深度的比值在0.09%～0.32%之間,發(fā)生位置由墻頂移動(dòng)到開挖面附近。隨著基坑開挖,土壓力的分布模式分為兩種型態(tài),分別是波狀遞增型態(tài)和斜階梯伴有凹槽型態(tài);土壓力變化大致分為兩部分,墻頂至三分之一墻高范圍內(nèi)土壓力呈現(xiàn)增大的趨勢,其余范圍內(nèi)土壓力呈現(xiàn)減小的趨勢;土壓力與位移的關(guān)系可以歸納為雙曲線關(guān)系、二次函數(shù)關(guān)系和斜直線關(guān)系(3)在上述工程實(shí)例基礎(chǔ)上,分別分析了 土體力學(xué)參數(shù)(粘聚力和內(nèi)摩擦角)、地下連續(xù)墻厚度、懸臂開挖深度、支護(hù)結(jié)構(gòu)插入比、鄰近建筑物與基坑的距離、地面超載(超載大小、超載離基坑邊的距離和超載長度)、鄰近地下室(鄰近地下室離地連墻的距離、鄰近地下室的高度以及鄰近地下室的寬度)影響因素對地下連續(xù)墻的變形和土壓力的變化規(guī)律。
[Abstract]:At present, conventional support methods are widely used in deep foundation pit engineering, and many building materials are wasted because they can not be reused. "two walls in one" refers to the underground continuous wall, which has been widely used in practice as a vertical bearing function of the exterior wall of the basement, as well as a retaining and impervious supporting structure. But it has the original temporary support structure system and the deformation characteristics of the permanent structure, and the earth pressure is the main load acting on the support structure, and the effect on the force and deformation of the support structure is self-evident. The systematic study of deformation and earth pressure of "two walls in one" support structure is of great significance to the design and construction of engineering. In this paper, based on the foundation pit engineering of Block A7 of Tongde Square, Kunming, a three-dimensional finite element model of soil, structure and surrounding environment is established by using finite element software, and the construction process of the foundation pit is simulated and analyzed. The calculated results are basically consistent with the actual monitoring data, which shows that the analytical model is reliable, and the numerical simulation results are analyzed in detail. The main contents and conclusions are as follows: (1) on the basis of previous studies, a formula for calculating displacement-earth pressure is established. It can provide a certain reference value for the design of similar foundation pit. (2) the lateral displacement curve of continuous wall changes from cantilever type to convex shape, the ratio of maximum lateral displacement value to excavation depth of corresponding working condition is 0.09%, and the occurrence position moves from the top of the wall to near the excavating surface. With the excavation of foundation pit, the distribution pattern of earth pressure can be divided into two types, one is the increasing wave pattern and the other is the inclined ladder with grooves, and the variation of earth pressure is divided into two parts. From the top of the wall to the high range of 1/3 wall, the earth pressure increases, and the earth pressure decreases in the other areas, and the relationship between the earth pressure and displacement can be summed up as hyperbolic relationship. Quadratic function relation and oblique straight line relation (3) based on the above engineering examples, the mechanical parameters of soil (cohesion and angle of internal friction), the thickness of underground continuous wall, the depth of cantilever excavation, the insertion ratio of supporting structure are analyzed, respectively. Distance between adjacent building and foundation pit, ground overload (size of overload, distance of overload from side of foundation pit and length of overload), adjacent basement (distance of adjacent basement from wall to ground), The variation law of deformation and earth pressure of diaphragm wall is influenced by the height of adjacent basement and the width of adjacent basement.
【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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