本文關(guān)鍵詞： 基坑工程 數(shù)值模擬 地下連續(xù)墻 監(jiān)測(cè)數(shù)據(jù)　出處：《西安科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：選用地下連續(xù)墻開挖支護(hù)的基坑工程是目前工程地質(zhì)領(lǐng)域重點(diǎn)研究的問題之一。探討支護(hù)結(jié)構(gòu)在開挖過程中的應(yīng)力應(yīng)變特征,達(dá)到更加有效的控制基坑在開挖過程中周圍巖土體的變形控制。使開挖建設(shè)的基坑支護(hù)工程在安全穩(wěn)定和使用功能滿足各方面要求的同時(shí),又能使經(jīng)濟(jì)節(jié)約這個(gè)目的得以滿足,是當(dāng)前工程界非常值得探討的課題�；娱_挖造成的周圍巖土體沉降變形和支護(hù)結(jié)構(gòu)的偏移給周邊建筑物造成安全使用隱患,使得人們得重視程度提高。在基坑支護(hù)工程開挖施工的過程中,圓形地下連續(xù)墻支護(hù)能夠利用自身結(jié)構(gòu)剛度大和土拱效應(yīng)的特點(diǎn),有效的規(guī)避或者減小對(duì)周邊建筑物或者巖土體的擾動(dòng),以及控制對(duì)周圍重要正在使用的建筑物安全穩(wěn)定性的影響。其具體減小擾動(dòng)程度量化分析值得深入探討研究,在工程應(yīng)用領(lǐng)域也有很高的實(shí)用價(jià)值。本文以圓形地下連續(xù)墻支護(hù)結(jié)構(gòu)為研究對(duì)象。分析現(xiàn)場(chǎng)監(jiān)測(cè)數(shù)據(jù),進(jìn)行數(shù)值模擬計(jì)算�？偨Y(jié)周圍巖土體沉降量和墻身偏移量?jī)蓚�(gè)關(guān)鍵變量的普通規(guī)律,得到如下幾點(diǎn)成果:(1)分析現(xiàn)場(chǎng)監(jiān)測(cè)數(shù)據(jù),得到在1、2、3、7、8、9工況監(jiān)測(cè)點(diǎn)處沉降量隨基坑開挖深度增加而呈線性增長(zhǎng),增長(zhǎng)速度略有不同,在4、5、6工況監(jiān)測(cè)點(diǎn)處沉降量變化較小,甚至減小。在開挖深度范圍內(nèi)墻身偏移量隨開挖深度增加呈線性增長(zhǎng),在開挖深度以下出現(xiàn)反向偏移,最大偏移量出現(xiàn)在2/3最終開挖深度處。(2)分析云圖和模擬數(shù)據(jù),得到地表沉降累計(jì)最大值的位置會(huì)隨基坑開挖深度遞增而向基坑外側(cè)移動(dòng)。基坑周邊沉降量集中在距離基坑邊緣0.5-1.0倍的基坑開挖深度處。隨著基坑開挖深度逐層增加,墻身最大偏移量下移,且墻身偏移量折線圖逐漸呈類似“S”型。同樣能得到墻身最大偏移量出現(xiàn)在2/3開挖深度至坑底的附近區(qū)域內(nèi)。(3)比較分析監(jiān)測(cè)數(shù)據(jù)和模擬計(jì)算結(jié)果,得知有限元數(shù)值模擬可以有效計(jì)算分析圓形地下連續(xù)墻的周邊沉降和墻身偏移量,預(yù)測(cè)類似工程周邊沉降和結(jié)構(gòu)變形,減少工程造價(jià)和提高施工監(jiān)測(cè)準(zhǔn)確率。
[Abstract]:The selection of underground continuous wall excavation is one of the most important problems in the field of engineering geology at present. The characteristics of stress and strain of supporting structure during excavation are discussed. In order to control the deformation of surrounding rock and soil in the excavation process more effectively, so that the foundation pit support engineering can meet the requirements of safety, stability and use, at the same time, the purpose of economic saving can be satisfied. The settlement and deformation of surrounding rock and soil caused by excavation of foundation pit and the deviation of supporting structure cause hidden danger for the safety of surrounding buildings. In the process of excavation construction of foundation pit support engineering, circular underground continuous wall support can make use of the characteristics of its own structure stiffness and soil arch effect. Effectively circumventing or reducing the disturbance to surrounding buildings or rock and soil, as well as controlling the influence on the safety and stability of buildings that are important in use around them. It is also of great practical value in engineering application. In this paper, the circular underground continuous wall supporting structure is taken as the research object, and the field monitoring data are analyzed. The common law of two key variables, the settlement of surrounding rock and soil mass and the displacement of wall body, are summarized, and the following results are obtained: 1) analyzing the field monitoring data. It has been obtained that the settlement at the monitoring point of 1 / 2 / 2 / 2 / 3 / 7 / 7 / 8 / 9 is linearly increased with the increase of excavation depth, and the increase rate is slightly different, and at the monitoring point of 4 / 5 / 5 / 6 condition, the variation of settlement is relatively small. In the range of excavation depth, the displacement of wall body increases linearly with the increase of excavation depth, and the reverse migration occurs below the excavation depth, and the maximum migration occurs at the 2/3 final excavation depth.) the cloud map and simulation data are analyzed. The position of the accumulated maximum value of surface settlement will move to the outside of the pit with the increase of the excavation depth. The settlement of the surrounding foundation pit is concentrated at the depth of the pit excavation 0.5-1.0 times from the edge of the foundation pit. With the increase of the excavation depth of the foundation pit layer by layer, The maximum displacement of the wall body moves down, and the curve of the displacement of the wall body is gradually similar to that of "S". It can also be obtained that the maximum displacement of the wall body appears in the area near the depth of 2/3 excavation to the bottom of the pit.) the monitoring data and simulation results are compared and analyzed. It is known that the finite element numerical simulation can effectively calculate and analyze the peripheral settlement and wall body displacement of circular underground continuous wall, predict the peripheral settlement and structural deformation of similar projects, reduce the project cost and improve the accuracy of construction monitoring.
【學(xué)位授予單位】：西安科技大學(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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