【摘要】：近年來，隨著城市建設(shè)步伐日益推進，基坑工程的數(shù)量在不斷增長，基坑開挖的深度越來越深，而周邊環(huán)境相鄰建筑物、地下管道相距很近，導(dǎo)致在開挖和支護過程中遇到的問題十分復(fù)雜，深基坑周邊環(huán)境沉降變形是其中突出的技術(shù)難點之一，本文結(jié)合實際工程對基坑設(shè)計和監(jiān)測環(huán)節(jié)中出現(xiàn)的問題展開研究。 通過構(gòu)建有限元模型，對基坑的開挖卸荷及降水過程展開數(shù)值模擬，得到了基坑周邊環(huán)境變形情況的計算結(jié)果，為科學(xué)判斷鄰近基坑工程受沉降影響程度提供了依據(jù)，為基坑變形監(jiān)測工作開展提供了前提條件，同時也驗證了復(fù)雜工況下深基坑支護方案的正確性。 在大量變形監(jiān)測數(shù)據(jù)的基礎(chǔ)上，以各監(jiān)測點的最大沉降速率值為研究對象，采用統(tǒng)計分析法對基坑周邊環(huán)境沉降變形數(shù)據(jù)進行信息挖掘，根據(jù)繪制的百分比餅圖和柱形圖，發(fā)現(xiàn)監(jiān)測數(shù)據(jù)與預(yù)先設(shè)定的報警值有較大差別，高頻段沉降速率出現(xiàn)的概率很低。因此，對沉降速率報警值進行了修正，建立了二級預(yù)警機制，并應(yīng)用于工程實際。 利用指數(shù)曲線模型、雙曲線模型和灰色模型，基于誤差絕對值加權(quán)和最小的準(zhǔn)則，借助MATLAB軟件計算加權(quán)平均數(shù)，創(chuàng)建出預(yù)測精度更高的加權(quán)組合模型，，對深基坑周邊建筑物的沉降變形進行預(yù)測分析。借助周邊建筑物沉降變形速率預(yù)測值與報警值的比對結(jié)果，確定了沉降觀測周期的長短。
[Abstract]:In recent years, with the increasing pace of urban construction, the number of foundation pit engineering is increasing, the excavation depth of foundation pit is getting deeper and deeper, and the adjacent buildings in the surrounding environment, underground pipelines are very close to each other. The problems encountered in excavation and support are very complex, and the settlement and deformation of the surrounding environment of deep foundation pit is one of the prominent technical difficulties. This paper studies the problems in the design and monitoring of foundation pit combined with practical engineering. By constructing the finite element model, the numerical simulation of excavation unloading and dewatering process is carried out, and the calculation results of the surrounding environment deformation of the foundation pit are obtained, which provides the basis for scientifically judging the degree of settlement influence on the adjacent foundation pit engineering. It provides a prerequisite for foundation pit deformation monitoring and verifies the correctness of deep foundation pit support scheme under complex working conditions. On the basis of a large number of deformation monitoring data, taking the maximum settlement rate value of each monitoring point as the research object, using the statistical analysis method to mine the settlement and deformation data of the surrounding environment of foundation pit, according to the percentage pie chart and the column chart drawn, It is found that there is a great difference between the monitoring data and the pre-set alarm value, and the probability of settlement rate in high frequency band is very low. Therefore, the warning value of settlement rate is revised, and the secondary warning mechanism is established, which is applied to engineering practice. Using exponential curve model, hyperbolic model and grey model, based on the criterion of weighted and minimum absolute value of error, a weighted combination model with higher prediction accuracy is established by using MATLAB software to calculate the weighted average. The settlement deformation of buildings around deep foundation pit is predicted and analyzed. The length of settlement observation period is determined by comparing the prediction value of settlement deformation rate with the warning value.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU433

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