鄰近基坑開挖對千廝門大橋引橋安全性影響評估
發(fā)布時間：2019-05-19 23:31
【摘要】：隨著我國城鎮(zhèn)化建設(shè)的發(fā)展，地下空間逐漸被充分開發(fā)利用，特別地，在重慶這樣的山地城市尤為明顯。伴隨著城市交通立體化的發(fā)展，深基坑工程緊鄰城市橋梁和軌道交通車站的現(xiàn)象頻頻出現(xiàn)。深基坑的開挖打破了鄰近橋梁和車站原有的平衡狀態(tài)，勢必對其安全性產(chǎn)生一定風險。因此，加強緊鄰深基坑工程的城市橋梁風險研究顯得非常重要。 本文以重慶千廝門大橋為工程背景，圍繞千廝門大橋引橋受鄰近越洋深基坑開挖影響產(chǎn)生的風險展開研究，主要分析內(nèi)容如下： ①風險指標體系是進行橋梁風險評估的基礎(chǔ)和關(guān)鍵。基于此，從設(shè)計、施工、結(jié)構(gòu)、環(huán)境、企業(yè)管理等角度總結(jié)了橋梁工程、基坑工程的風險指標體系。結(jié)合千廝門大橋引橋和越洋基坑工程特點，建立千廝門大橋引橋風險指標體系，包括邊坡支護設(shè)計方案、基坑施工方式等6個一級風險指標和一階支護、退臺分階支護、基坑開挖順序等16個二級風險指標。 ②提出關(guān)鍵風險指標辨識、關(guān)鍵風險指標校驗相結(jié)合的風險評估方法，并應(yīng)用于千廝門大橋引橋的風險評估�；陟乩碚摚蓪＜掖蚍执_定單個風險指標權(quán)重，得到評判矩陣，依此建立風險辨識模型。通過計算單個風險指標熵值判斷出關(guān)鍵風險指標。通過對千廝門大橋引橋計算表明：邊坡支護設(shè)計方案為關(guān)鍵風險指標。基于基坑對橋梁影響機理分析，選取位移值和沉降值作為千廝門大橋引橋校驗分析指標。以一階支護和退臺分階支護兩種方案作為分析模型，運用ABAQUS有限元分析技術(shù)，對千廝門大橋引橋和匝道的位移、沉降進行分析，以此校驗關(guān)鍵風險指標，校驗結(jié)果表明：關(guān)鍵風險指標可以接受。進一步對比分析兩種支護方案下千廝門大橋引橋和匝道的位移值、沉降值，判斷出退臺分階支護方案比一階支護方案更合理。 ③風險評估是為了預(yù)防事故發(fā)生，應(yīng)在風險評估基礎(chǔ)上采取風險預(yù)控措施�；谇P門大橋引橋風險預(yù)控體系，提出風險監(jiān)控作為千廝門大橋引橋風險預(yù)控手段。根據(jù)千廝門大橋引橋風險評估結(jié)果和風險機制建立原則，從報警值、預(yù)警值、控制值建立千廝門大橋引橋三級預(yù)警機制。通過對Z01~Z18等18個沉降監(jiān)測點和X01~X18等18個位移監(jiān)測點進行監(jiān)測，實現(xiàn)對千廝門大橋引橋的風險預(yù)控。基于引橋與基坑空間位置關(guān)系，選取X06~X08、X10~X12、Z06~Z08、Z10~Z12等關(guān)鍵監(jiān)測點進行數(shù)據(jù)分析，，分析結(jié)果表明：千廝門大橋引橋和匝道的位移值、沉降值未超過報警值，風險在可控范圍內(nèi)。 論文提出的風險評估方法在千廝門大橋引橋風險分析中適應(yīng)性強，可為類似工程的風險控制提供分析思路和經(jīng)驗，論文構(gòu)建的風險評估方法及風險監(jiān)控手段具有一定應(yīng)用價值。最后，對城市橋梁風險評估研究進行了展望，提出了在此領(lǐng)域需要進一步開展的研究工作。
[Abstract]:With the development of urbanization in China, underground space is gradually being fully developed and utilized, especially in mountainous cities such as Chongqing. With the development of three-dimensional urban traffic, the phenomenon of deep foundation pit engineering adjacent to urban bridges and rail transit stations occurs frequently. The excavation of deep foundation pit breaks the original equilibrium state of adjacent bridges and stations, and is bound to pose certain risks to its safety. Therefore, it is very important to strengthen the study of urban bridge risk adjacent to deep foundation pit engineering. In this paper, based on the engineering background of Chongqing Qianshuangmen Bridge, the risk caused by the influence of adjacent ocean-crossing deep foundation pit excavation on the approach bridge of Qianshuangmen Bridge is studied. The main analysis contents are as follows: 1 the risk index system is the basis and key of bridge risk assessment. Based on this, the risk index system of bridge engineering and foundation pit engineering is summarized from the aspects of design, construction, structure, environment, enterprise management and so on. Combined with the characteristics of the approach bridge of Qianshuangmen Bridge and the transoceanic foundation pit engineering, the risk index system of the approach bridge of Qianshuangmen Bridge is established, including six first-order risk indexes, such as slope support design scheme, foundation pit construction mode, first-order support and step-out support. There are 16 secondary risk indexes such as excavation sequence of foundation pit. (2) the risk assessment method based on the identification of key risk index and the verification of key risk index is put forward and applied to the risk assessment of the approach bridge of Qianshuimen Bridge. Based on entropy theory, the weight of a single risk index is determined by expert scoring, and the evaluation matrix is obtained, according to which the risk identification model is established. The key risk index is judged by calculating the entropy value of a single risk index. Through the calculation of the approach bridge of Qianshuangmen Bridge, it is shown that the design scheme of slope support is the key risk index. Based on the analysis of the influence mechanism of foundation pit on the bridge, the displacement value and settlement value are selected as the calibration and analysis indexes of the approach bridge of Qianshuangmen Bridge. The displacement and settlement of approach bridge and ramp of Qianjiangmen Bridge are analyzed by using ABAQUS finite element analysis technology, and the key risk indexes are verified by using the two schemes of first-order support and step-by-step support as analysis models, and the finite element analysis technique is used to analyze the displacement and settlement of the approach bridge and ramp of Qianjiangmen Bridge. The verification results show that the key risk indicators are acceptable. Furthermore, the displacement and settlement values of the approach bridge and ramp of Qianshuangmen Bridge under the two supporting schemes are compared and analyzed, and it is judged that the step-out support scheme is more reasonable than the first-order support scheme. In order to prevent accidents, risk pre-control measures should be taken on the basis of risk assessment. Based on the risk pre-control system of Qianshuangmen Bridge approach bridge, risk monitoring is put forward as a means of risk pre-control of Qianshuangmen Bridge approach bridge. According to the risk assessment results and the establishment principle of risk mechanism of Qianshuangmen Bridge approach bridge, the three-level early warning mechanism of Qianshuangmen Bridge approach bridge is established from alarm value, early warning value and control value. Through the monitoring of 18 settlement monitoring points such as Z01~Z18 and 18 displacement monitoring points such as X01~X18, the risk pre-control of the approach bridge of Qianshuangmen Bridge is realized. Based on the spatial position relationship between approach bridge and foundation pit, the key monitoring points such as X06 / X08, X10 / X12, Z06 / Z08, Z10 / Z12 are selected for data analysis. The results show that the displacement value and settlement value of approach bridge and ramp of Qianjiangmen Bridge do not exceed the alarm value, and the risk is within the controllable range. The risk assessment method proposed in this paper has strong adaptability in the risk analysis of the approach bridge of Qianshuangmen Bridge, and can provide analysis ideas and experience for the risk control of similar projects. The risk assessment method and risk monitoring method constructed in this paper have certain application value. Finally, the research on urban bridge risk assessment is prospected, and the further research work in this field is put forward.
【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;U447
本文編號：2481158
[Abstract]:With the development of urbanization in China, underground space is gradually being fully developed and utilized, especially in mountainous cities such as Chongqing. With the development of three-dimensional urban traffic, the phenomenon of deep foundation pit engineering adjacent to urban bridges and rail transit stations occurs frequently. The excavation of deep foundation pit breaks the original equilibrium state of adjacent bridges and stations, and is bound to pose certain risks to its safety. Therefore, it is very important to strengthen the study of urban bridge risk adjacent to deep foundation pit engineering. In this paper, based on the engineering background of Chongqing Qianshuangmen Bridge, the risk caused by the influence of adjacent ocean-crossing deep foundation pit excavation on the approach bridge of Qianshuangmen Bridge is studied. The main analysis contents are as follows: 1 the risk index system is the basis and key of bridge risk assessment. Based on this, the risk index system of bridge engineering and foundation pit engineering is summarized from the aspects of design, construction, structure, environment, enterprise management and so on. Combined with the characteristics of the approach bridge of Qianshuangmen Bridge and the transoceanic foundation pit engineering, the risk index system of the approach bridge of Qianshuangmen Bridge is established, including six first-order risk indexes, such as slope support design scheme, foundation pit construction mode, first-order support and step-out support. There are 16 secondary risk indexes such as excavation sequence of foundation pit. (2) the risk assessment method based on the identification of key risk index and the verification of key risk index is put forward and applied to the risk assessment of the approach bridge of Qianshuimen Bridge. Based on entropy theory, the weight of a single risk index is determined by expert scoring, and the evaluation matrix is obtained, according to which the risk identification model is established. The key risk index is judged by calculating the entropy value of a single risk index. Through the calculation of the approach bridge of Qianshuangmen Bridge, it is shown that the design scheme of slope support is the key risk index. Based on the analysis of the influence mechanism of foundation pit on the bridge, the displacement value and settlement value are selected as the calibration and analysis indexes of the approach bridge of Qianshuangmen Bridge. The displacement and settlement of approach bridge and ramp of Qianjiangmen Bridge are analyzed by using ABAQUS finite element analysis technology, and the key risk indexes are verified by using the two schemes of first-order support and step-by-step support as analysis models, and the finite element analysis technique is used to analyze the displacement and settlement of the approach bridge and ramp of Qianjiangmen Bridge. The verification results show that the key risk indicators are acceptable. Furthermore, the displacement and settlement values of the approach bridge and ramp of Qianshuangmen Bridge under the two supporting schemes are compared and analyzed, and it is judged that the step-out support scheme is more reasonable than the first-order support scheme. In order to prevent accidents, risk pre-control measures should be taken on the basis of risk assessment. Based on the risk pre-control system of Qianshuangmen Bridge approach bridge, risk monitoring is put forward as a means of risk pre-control of Qianshuangmen Bridge approach bridge. According to the risk assessment results and the establishment principle of risk mechanism of Qianshuangmen Bridge approach bridge, the three-level early warning mechanism of Qianshuangmen Bridge approach bridge is established from alarm value, early warning value and control value. Through the monitoring of 18 settlement monitoring points such as Z01~Z18 and 18 displacement monitoring points such as X01~X18, the risk pre-control of the approach bridge of Qianshuangmen Bridge is realized. Based on the spatial position relationship between approach bridge and foundation pit, the key monitoring points such as X06 / X08, X10 / X12, Z06 / Z08, Z10 / Z12 are selected for data analysis. The results show that the displacement value and settlement value of approach bridge and ramp of Qianjiangmen Bridge do not exceed the alarm value, and the risk is within the controllable range. The risk assessment method proposed in this paper has strong adaptability in the risk analysis of the approach bridge of Qianshuangmen Bridge, and can provide analysis ideas and experience for the risk control of similar projects. The risk assessment method and risk monitoring method constructed in this paper have certain application value. Finally, the research on urban bridge risk assessment is prospected, and the further research work in this field is put forward.
【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;U447
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本文編號：2481158
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