本文選題：填海造地　切入點：深基坑　出處：《重慶大學》2014年碩士論文　論文類型：學位論文

【摘要】：近年來，大批填海造地工程出現(xiàn)在我國的沿海城市，越來越多的填海造地區(qū)深基坑工程需要建設。這些深基坑工程因填筑材料、填筑方法、基坑支護形式的不同，均存在不同程度的風險。因此，對特定的填海造地區(qū)域而言，，如何優(yōu)化設計深基坑的開挖方案迫在眉睫。 深圳灣是深圳市早期開發(fā)的填海造地區(qū)，本文研究的科技生態(tài)園二區(qū)深基坑工程位于深圳灣，屬于典型的填海造地區(qū)深基坑工程。本文通過實地調(diào)研和文獻分析相結合，對二區(qū)基坑開挖方案進行了初步設計。利用數(shù)值模擬方法進行基坑開挖全過程的計算，后采用改進的層次分析法構建基坑支護方案評價模型，融入模糊綜合評判思想，確定了最優(yōu)基坑開挖方案。 本文的主要研究工作、成果和結論如下： ①通過勘查資料和國內(nèi)外現(xiàn)狀分析，總結出本基坑的特點和難點。本基坑開挖工作量大、開挖深度深、地下水豐富且周圍環(huán)保要求高，參照以往填海造地區(qū)深基坑工程經(jīng)驗，初步設計三種基坑開挖支護方案； ②利用ANSYS完成基坑三維模型的建立實體建模和網(wǎng)格劃分，后利用FLAC3D有限差分軟件計算出三種支護方案在基坑開挖過程中的基坑位移、圍護結構內(nèi)力、位移數(shù)值模擬監(jiān)測點水平位移。數(shù)值模擬結果作為主要參考點，提供技術性評價指標； ③深基坑支護方案的優(yōu)選因素具有模糊性，傳統(tǒng)的經(jīng)驗判斷和層次分析法弊端較多，本文利用最優(yōu)傳遞矩陣對層次分析法進行改進，并依據(jù)模糊數(shù)學原理建立該工程支護方案優(yōu)選的綜合評價模型，從技術性、經(jīng)濟性、環(huán)保性三個方面對初選的方案進行綜合評判； ④計算三種支護方案的模糊綜合評判結果，確定最優(yōu)基坑開挖方案為樁錨支護方案。最后對本基坑開挖過程中土方開挖、監(jiān)測體系和應急預案等方面，提出幾點工程建議。
[Abstract]:In recent years, a large number of reclamation projects have appeared in coastal cities of China, and more and more deep foundation pit projects in reclamation areas need to be constructed. Therefore, how to optimize the design of deep foundation pit excavation is urgent for a specific reclamation area. Shenzhen Bay is a reclamation area developed early in Shenzhen City. The deep foundation pit project in the second area of the Science and Technology Ecological Park is located in Shenzhen Bay, which belongs to the typical deep foundation pit project in the reclamation area. The method of numerical simulation is used to calculate the whole process of foundation pit excavation, and the improved analytic hierarchy process is used to construct the evaluation model of foundation pit support scheme, which is integrated with the idea of fuzzy comprehensive evaluation. The optimal excavation scheme is determined. The main research work, results and conclusions are as follows:. The main contents are as follows: (1) the characteristics and difficulties of this foundation pit are summarized through the analysis of the survey data and the present situation at home and abroad. The excavation work of this foundation pit is large, the excavation depth is deep, the groundwater is abundant and the environmental protection requirement is high, referring to the experience of deep foundation pit engineering in the reclamation area in the past. Three kinds of excavation and support schemes are preliminarily designed. (2) the solid modeling and mesh division of the three-dimensional model of foundation pit are completed by using ANSYS, and then the displacement and internal force of the retaining structure are calculated by using the FLAC3D finite difference software during the excavation of the foundation pit. Displacement numerical simulation monitoring points horizontal displacement. The numerical simulation results as the main reference points to provide technical evaluation indicators; (3) the optimal selection factors of deep foundation pit support scheme are fuzzy, and the traditional experience judgment and analytic hierarchy process (AHP) have many disadvantages. In this paper, the optimal transfer matrix is used to improve the AHP. According to the principle of fuzzy mathematics, the comprehensive evaluation model of the optimal selection of the engineering support scheme is established, and the primary project is comprehensively evaluated from the aspects of technology, economy and environmental protection. (4) the fuzzy comprehensive evaluation results of three kinds of support schemes are calculated, and the optimum excavation scheme of foundation pit is determined as pile-anchor support scheme. Finally, some engineering suggestions are put forward in respect of earthwork excavation, monitoring system and emergency plan during the excavation of this foundation pit.
【學位授予單位】：重慶大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU753

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