【摘要】：二十多年來我國基坑工程設計和施工水平都有了很大的提高,但是在發(fā)展過程中也出現了許多問題。一方面是基坑工程領域的工程事故率比較高,不少地區(qū)在發(fā)展初期大概有1/3的基坑工程發(fā)生過不同程度的事故,即使是在比較成熟階段地區(qū)也常有不同程度的事故發(fā)生：另一方面,由于圍護設計的不合理,常造成基坑工程費用偏大。因此本文主要針對兩種常用基坑支護方案——鉆孔灌注樁與SMW工法樁,在探索基坑工程風險分析研究的基礎上考慮基坑工程的造價問題,為決策出更好的施工方案提供理論依據。 本文的研究內容主要包括： 1.本文對基坑工程風險分析研究的主要思路是事故樹—層次分析法,根據事故樹編制的有關原則,在研究基坑工程事故原因基礎上,從構成支護體系的各子分部工程——樁身、內支撐體系、圍檁體系、圈梁和基礎所處為出發(fā)點,針對具體工程情況考慮與工程有關的風險源基本事件,針對兩種支護方案分別建深基坑工程支護結構事故樹,編制風險清單。 2.依據層次分析法原則結合風險清單,分別構建鉆孔灌注樁、SMW工法樁支護結構風險因素層次模型,采用專家調查法構建判斷矩陣,并采用冪法對鉆孔灌注樁風險因素權重進行計算,采用MATLAB計算語言編程計算SMW工法支護結構風險因素權重。利用MATLAB計算語言與判斷矩陣的計算相結合。 3.基于深基坑工程風險分析的研究結果對同一工程設計采用的兩種支護方案進行風險對比,并結合經濟分析,為決策優(yōu)選提供有力依據。
[Abstract]:The design and construction level of foundation pit engineering in China has been greatly improved in the past 20 years, but there are also many problems in the process of development. On the one hand, the accident rate in the field of foundation pit engineering is relatively high. In many areas, about 1 ~ 3 of the foundation pit works occurred in different degrees of accidents in the initial stage of development. Even in mature areas, accidents of different degrees often occur: on the other hand, because of unreasonable envelope design, the cost of foundation pit engineering is often too large. Therefore, this paper mainly aimed at two kinds of commonly used foundation pit supporting schemes-bored cast-in-place pile and SMW construction method pile, on the basis of exploring the foundation pit engineering risk analysis research, considering the foundation pit engineering cost problem, It provides a theoretical basis for the decision-making of a better construction scheme. The main contents of this paper are as follows: 1. In this paper, the main idea of risk analysis of foundation pit engineering is accident tree-analytic hierarchy process (AHP). According to the principle of accident tree compilation, and on the basis of studying the cause of foundation pit engineering accident, the main idea of this paper is pile body, which is the sub-branch engineering of supporting system. The internal bracing system, the surrounding purlin system, the circle beam and the foundation are the starting points. Considering the basic events of the risk sources related to the engineering, the accident tree of the supporting structure of the deep foundation pit is built respectively according to the two supporting schemes, which are concerned with the basic events of the engineering risk sources. Prepare a risk inventory. 2. According to the principle of Analytic hierarchy process (AHP) and the list of risks, the risk factors hierarchy model of bored pile and SMW pile supporting structure is constructed, and the judgment matrix is constructed by expert investigation method. The power method is used to calculate the weight of risk factors of bored pile, and the MATLAB programming language is used to calculate the weight of risk factors of SMW supporting structure. The MATLAB computing language is combined with the calculation of judgment matrix. 3. Based on the research results of risk analysis of deep foundation pit engineering, the risk comparison of the two supporting schemes adopted in the same engineering design is carried out, and the economic analysis is combined to provide a powerful basis for decision-making and optimization.
【學位授予單位】：揚州大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU753

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