本文關(guān)鍵詞： 填海深基坑工程 MIDAS/GTS數(shù)值模擬 咬合樁支護(hù) 最小二乘支撐向量機(jī)　出處：《遼寧工程技術(shù)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著沿海城市社會(huì)經(jīng)濟(jì)的快速發(fā)展,建設(shè)用地緊張和交通擁堵問(wèn)題日顯突出。采用填海造陸的方法解決建設(shè)用地緊張和修建地鐵緩解地面交通壓力已成為沿海城市發(fā)展戰(zhàn)略中普遍采取的有效措施之一。填海地區(qū)特殊的地質(zhì)和環(huán)境條件,使得其深基坑圍護(hù)結(jié)構(gòu)變形與其他軟土地區(qū)深基坑支護(hù)結(jié)構(gòu)變形有著明顯的不同。本文在總結(jié)近年來(lái)國(guó)內(nèi)外深基坑變形研究成果的基礎(chǔ)上,依托大連海之韻地鐵車站深基坑工程,采用理論分析、現(xiàn)場(chǎng)監(jiān)測(cè)和數(shù)值模擬等綜合方法對(duì)填海地區(qū)深基坑圍護(hù)結(jié)構(gòu)變形規(guī)律進(jìn)行研究,采用基于MATLAB的最小二乘支持向量機(jī)理論對(duì)深基坑圍護(hù)結(jié)構(gòu)水平變形進(jìn)行預(yù)測(cè),得出了一些有價(jià)值的結(jié)論。本文的主要研究成果如下：(1)對(duì)大連海之韻地鐵車站深基坑進(jìn)行了現(xiàn)場(chǎng)監(jiān)測(cè),通過(guò)對(duì)現(xiàn)場(chǎng)監(jiān)測(cè)資料進(jìn)行分析,獲得了圍護(hù)樁水平位移變化規(guī)律和鋼支撐軸力變化規(guī)律。結(jié)果表明,圍護(hù)結(jié)構(gòu)變形有著明顯的時(shí)空效應(yīng),及時(shí)安裝鋼支撐和加快施工速度可以有效的控制基坑變形。樁頂向坑外偏移,是由于樁體彈性變形所致。(2)建立了海之韻地鐵車站深基坑三維有限元模型,對(duì)圍護(hù)結(jié)構(gòu)變形進(jìn)行了模擬計(jì)算,并將模擬結(jié)果與實(shí)測(cè)數(shù)據(jù)進(jìn)行對(duì)比分析。結(jié)果表明,數(shù)值模擬所得水平位移曲線與現(xiàn)場(chǎng)實(shí)測(cè)所得水平位移曲線基本一致,現(xiàn)場(chǎng)施工過(guò)程中影響圍護(hù)結(jié)構(gòu)變形因素眾多,曲線存在一定的差異性。分析了不同樁長(zhǎng)對(duì)圍護(hù)結(jié)構(gòu)水平位移的影響,結(jié)果表明,入巖深度越大水平變形越小,但當(dāng)入巖深度達(dá)到一定時(shí),影響程度減小。(3)基于MATLAB工具箱,采用最小二乘支持向量機(jī)理論對(duì)深基坑圍護(hù)結(jié)構(gòu)水平位移進(jìn)行預(yù)測(cè)分析。結(jié)果表明,采用最小二乘向量機(jī)可以對(duì)圍護(hù)結(jié)構(gòu)水平位移進(jìn)行精度較高的預(yù)測(cè),同時(shí)獲得了深基坑圍護(hù)結(jié)構(gòu)水平位移的未來(lái)變化趨勢(shì),從而達(dá)到對(duì)圍護(hù)結(jié)構(gòu)早預(yù)測(cè)早控制的目的。
[Abstract]:With the rapid development of social economy in coastal cities. The problems of shortage of construction land and traffic congestion are becoming more and more prominent. To solve the shortage of construction land and to relieve the ground traffic pressure by building subway has become one of the most effective measures in coastal city development strategy. 1. Special geological and environmental conditions in reclamation areas. The deformation of retaining structure in deep foundation pit is obviously different from that in other soft soil areas. This paper summarizes the research results of deep foundation pit deformation at home and abroad in recent years. Based on the deep foundation pit engineering of Dalian Haizhiyun subway station, the deformation law of the retaining structure of deep foundation pit in reclaimed area is studied by comprehensive methods such as theoretical analysis, field monitoring and numerical simulation. The theory of least squares support vector machine (LS-SVM) based on MATLAB is used to predict the horizontal deformation of the retaining structure of deep foundation pit. Some valuable conclusions are drawn. The main research results of this paper are as follows: 1) the deep foundation pit of Dalian Haizhiyun subway station is monitored on the spot, and the site monitoring data are analyzed. The variation of horizontal displacement and axial force of steel braces are obtained. The results show that the deformation of the retaining structure has obvious space-time effect. Timely installation of steel support and acceleration of construction speed can effectively control the deformation of foundation pit. The displacement of pile top to the outside of pit is caused by elastic deformation of pile. (2) the three-dimensional finite element model of deep foundation pit of Haizhiyun subway station is established. The deformation of the enclosure structure is simulated and compared with the measured data. The results show that the horizontal displacement curve obtained by the numerical simulation is basically consistent with the horizontal displacement curve measured in the field. There are many factors affecting the deformation of the retaining structure in the field construction, and there are some differences in the curves. The influence of different pile lengths on the horizontal displacement of the retaining structure is analyzed. The results show that the greater the depth of entry, the smaller the horizontal deformation. But when the depth of the rock reaches a certain depth, the influence degree is reduced. 3) based on the MATLAB toolbox. The theory of least square support vector machine (LS-SVM) is used to predict the horizontal displacement of the retaining structure of deep foundation pit. The results show that the LS-SVM can predict the horizontal displacement of the retaining structure with high accuracy. At the same time, the trend of horizontal displacement of retaining structure of deep foundation pit is obtained in the future, so as to achieve the purpose of early prediction and early control of retaining structure.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU753

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