以南京地铁二号线某盾构隧道施工段为背景,采用有限元分析法,应用有限元软件Plaxis 3D Tunnel,研究了盾构推进过程中工作面平衡压力的变化对周围土体变形的影响情况,并将数值模拟结果与实测结果进行了对比分析,得到了工作面平衡压力的...以南京地铁二号线某盾构隧道施工段为背景,采用有限元分析法,应用有限元软件Plaxis 3D Tunnel,研究了盾构推进过程中工作面平衡压力的变化对周围土体变形的影响情况,并将数值模拟结果与实测结果进行了对比分析,得到了工作面平衡压力的变化对工作面上土体以及盾构前方地表土体的变形规律,同时还得到了工作面平衡压力值随隧道埋深变化的计算公式。分析结果表明:盾构推进引起的地表竖向位移最大处位于隧道轴线位置上;盾构工作面平衡压力应该控制在Pref^2Pref之间,最大不能超过3Pref;当工作面平衡压力Pref^2Pref之间时,盾构工作面平衡压力与隧道埋深是线性关系,两者成正比。展开更多
Underground engineering,including shield tunnel construction,is a significant contributor to carbon dioxide emissions in infrastructure engineering projects.To better predict and control the carbon emissions associate...Underground engineering,including shield tunnel construction,is a significant contributor to carbon dioxide emissions in infrastructure engineering projects.To better predict and control the carbon emissions associated with shield tunnel construction,this paper presents a novel calculation method:the modified process analysis method based on inputoutput and process analysis methods.To evaluate the effectiveness of the proposed method,a specific shield tunnel construction project was selected as a case study.The modified process analysis method was used to analyze the various factors that influence carbon emissions during the project’s construction phase.In addition,a neural network approach was applied to validate the accuracy of the calculation using the LSTM and BP neural network.The results demonstrate that the proposed method not only combines the strengths of traditional methods but also offers high accuracy and acceptable error rates.Based on these findings,several measures to reduce carbon emissions during shield tunnel construction are suggested,providing valuable insights for reducing CO_(2) emissions associated with infrastructure engineering projects.This study highlights the importance of adopting innovative approaches to reduce carbon emissions and promotes the implementation of sustainable practices in the construction industry.Through the use of advanced analytical methods,such as the proposed modified process analysis method,we can effectively mitigate the environmental impact of construction activities and make significant contributions to the global effort to combat climate change.展开更多
文摘以南京地铁二号线某盾构隧道施工段为背景,采用有限元分析法,应用有限元软件Plaxis 3D Tunnel,研究了盾构推进过程中工作面平衡压力的变化对周围土体变形的影响情况,并将数值模拟结果与实测结果进行了对比分析,得到了工作面平衡压力的变化对工作面上土体以及盾构前方地表土体的变形规律,同时还得到了工作面平衡压力值随隧道埋深变化的计算公式。分析结果表明:盾构推进引起的地表竖向位移最大处位于隧道轴线位置上;盾构工作面平衡压力应该控制在Pref^2Pref之间,最大不能超过3Pref;当工作面平衡压力Pref^2Pref之间时,盾构工作面平衡压力与隧道埋深是线性关系,两者成正比。
基金supported by the National Natural Science Foundation of China(Grant No.52079128)Anhui province university discipline(professional)top talents academic funding project,project number:gxbjZD2022085.
文摘Underground engineering,including shield tunnel construction,is a significant contributor to carbon dioxide emissions in infrastructure engineering projects.To better predict and control the carbon emissions associated with shield tunnel construction,this paper presents a novel calculation method:the modified process analysis method based on inputoutput and process analysis methods.To evaluate the effectiveness of the proposed method,a specific shield tunnel construction project was selected as a case study.The modified process analysis method was used to analyze the various factors that influence carbon emissions during the project’s construction phase.In addition,a neural network approach was applied to validate the accuracy of the calculation using the LSTM and BP neural network.The results demonstrate that the proposed method not only combines the strengths of traditional methods but also offers high accuracy and acceptable error rates.Based on these findings,several measures to reduce carbon emissions during shield tunnel construction are suggested,providing valuable insights for reducing CO_(2) emissions associated with infrastructure engineering projects.This study highlights the importance of adopting innovative approaches to reduce carbon emissions and promotes the implementation of sustainable practices in the construction industry.Through the use of advanced analytical methods,such as the proposed modified process analysis method,we can effectively mitigate the environmental impact of construction activities and make significant contributions to the global effort to combat climate change.
