本文選題：深基坑 + 監(jiān)測(cè)　； 參考：《合肥工業(yè)大學(xué)》2017年碩士論文

【摘要】：隨著城市建設(shè)發(fā)展,地下空間的開發(fā)也進(jìn)入一個(gè)高峰期,基坑工程規(guī)模越來越大,保證深基坑工程施工時(shí)的安全穩(wěn)定成了建筑安全的重點(diǎn)。基坑開挖過程中,必然會(huì)引起基坑的變形,如何控制基坑變形至關(guān)重要;施工監(jiān)測(cè)作為信息化施工關(guān)鍵的環(huán)節(jié),實(shí)時(shí)觀測(cè)開挖時(shí)位移、內(nèi)力的變化情況,在施工期間使基坑及周邊建(構(gòu))筑物的安全受控;通過有限元軟件對(duì)基坑開挖過程進(jìn)行數(shù)值模擬,可有效地把握施工期間基坑的整體變形形態(tài)與趨勢(shì),指導(dǎo)安全施工;利用精度可靠的預(yù)測(cè)模型預(yù)測(cè)后續(xù)施工中基坑的變形發(fā)展情況,對(duì)工程施工的安全和質(zhì)量控制具有重要指導(dǎo)意義;三者皆是控制基坑變形的重要手段。本文以某一在建深基坑逆作法施工的工程實(shí)例為依托,首先利用origin軟件對(duì)實(shí)際監(jiān)測(cè)數(shù)據(jù)進(jìn)行整理分析,探究了包括地下連續(xù)墻變形、周邊土體沉降、建筑物沉降等變形情況,并利用經(jīng)驗(yàn)公式對(duì)前述變形進(jìn)行了計(jì)算;再利用MIDAS GTS NX軟件模擬該深基坑開挖過程,建模時(shí)考慮了時(shí)間效應(yīng),得出了在整個(gè)過程中上述位移的變化特征與趨勢(shì),地下連續(xù)墻變形先呈線性后呈S形,周邊土體沉降呈倒弓形、距基坑6~10m處沉降最大,坑底隆起隨土體開挖而逐漸增大;同時(shí)還探討了影響變形的關(guān)鍵因素;最后以灰色理論為理論基礎(chǔ),在前人研究基礎(chǔ)上利用MATLAB編制了非等步距的灰色GM(1,1)模型;灰色馬爾科夫鏈、BP神經(jīng)網(wǎng)絡(luò)及灰色馬爾科夫-BP神經(jīng)網(wǎng)絡(luò)模型雖精度更高但預(yù)測(cè)結(jié)果偏于保守,灰色系統(tǒng)模型具有“少樣本、貧信息”的特點(diǎn)且模型適合于短期預(yù)測(cè),預(yù)測(cè)值更貼近于實(shí)際且能夠得出一個(gè)上限控制值,在施工進(jìn)程中就能做出足夠的安全保障措施來控制變形;因此,此非等步距灰色GM(1,1)模型可運(yùn)用在實(shí)際基坑工程中,預(yù)測(cè)基坑變形,對(duì)指導(dǎo)施工、保障基坑安全穩(wěn)定有重要意義。
[Abstract]:With the development of urban construction and the development of underground space, the development of underground space has also entered a peak period, and the scale of foundation pit engineering is becoming larger and larger. The safety and stability of deep foundation pit construction has become the key point of construction safety. In the process of foundation pit excavation, it is necessary to cause the deformation of foundation pit. How to control the deformation of foundation pit is very important. As the key link of information construction, the displacement and internal force of excavation are observed in real time. During construction, the safety of foundation pit and surrounding building is controlled, and the numerical simulation of excavation process is carried out by finite element software, which can effectively grasp the whole deformation pattern and trend of foundation pit during construction, and guide the safe construction. The prediction of foundation pit deformation in subsequent construction by using accurate and reliable prediction model is of great significance to the safety and quality control of engineering construction, and all three are important means to control foundation pit deformation. Based on an example of the reverse construction of a deep foundation pit under construction, this paper first analyzes the actual monitoring data by using origin software, and probes into the deformation of underground continuous wall, the settlement of surrounding soil, the settlement of buildings, and so on, which includes the deformation of underground continuous wall, the settlement of surrounding soil, the settlement of building, and so on. The deformation of the deep foundation pit is simulated by Midas GTS NX software, and the time effect is taken into account in the modeling, and the change characteristics and trends of the above displacements in the whole process are obtained. The deformation of underground continuous wall is linear first and then S shape, the settlement of surrounding soil is inverted arch, the settlement is the largest at 6m from foundation pit, the uplift of pit bottom increases gradually with soil excavation, and the key factors affecting deformation are also discussed. Finally, based on the grey theory, the grey GM1 / 1) model is developed by using MATLAB on the basis of previous studies. The grey Markov chain BP neural network and the grey Markov BP neural network model are more accurate, but the prediction results are conservative. The grey system model has the characteristics of "less sample, poor information" and the model is suitable for short-term prediction. The predicted value is closer to reality and can obtain an upper limit control value, and sufficient safety measures can be made in the construction process to control the deformation; therefore, the non-equistep gray GM1 / 1) model can be used in actual foundation pit engineering. The prediction of foundation pit deformation is of great significance to guide construction and ensure the safety and stability of foundation pit.
【學(xué)位授予單位】：合肥工業(yè)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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