To investigate the effect of deep foundation pit excavation on the stability of retaining structure, a subway stationin the city of Jinan was selected as a project, and a FLAC3D-based three dimensional model was devel...To investigate the effect of deep foundation pit excavation on the stability of retaining structure, a subway stationin the city of Jinan was selected as a project, and a FLAC3D-based three dimensional model was developed fornumerical simulation. The horizontal displacement of the retaining structure, the axial force of the support, andthe vertical displacement of the column were studied and compared to the collected data from the field. The findingsindicate that when the foundation pit is excavated, the maximum deformation of the retaining structure progressivelydecreases from the top, the distortion of the retaining structure gradually rises, and the final maximumdeformation is around 17 meters deep. In each layer of support, the largest axial force support is located in thefirst reinforced concrete support;the uplift of the pit bottom caused by soil unloading plays a primary role in thevertical displacement of the column, and the column exhibits an upward trend under all construction conditions.When compared to the measured data, the generated findings are comparable and the fluctuation trend is extremelyconsistent. The findings of this article may give technical direction for the development of subway stationswith a comparable engineering basis.展开更多
Subway project foundation pit internal drainage mainly uses the foundation pit dewatering and foundation pit drainage technology. Considering that the geological conditions of subway construction are not clear, well p...Subway project foundation pit internal drainage mainly uses the foundation pit dewatering and foundation pit drainage technology. Considering that the geological conditions of subway construction are not clear, well point dewatering, drainage and dewatering are usually used. Although the well point dewatering technology is very skilled, it is not suitable for all geological conditions, such as relatively fine particles, the geological effect is not obvious.展开更多
This paper focuses on the content of a subway construction project, deeply studies the actual situation of the integrated construction technology of subway station and the foundation pit of adjacent buildings, and exp...This paper focuses on the content of a subway construction project, deeply studies the actual situation of the integrated construction technology of subway station and the foundation pit of adjacent buildings, and explores some integrated construction technologies that conform to the actual situation.展开更多
Taking the deep foundation pit accident occurring at a station of metro Line 2 in Taiyuan as an example,the influence of the seepage and inrush of the foundation pit on the retaining structure and surrounding environm...Taking the deep foundation pit accident occurring at a station of metro Line 2 in Taiyuan as an example,the influence of the seepage and inrush of the foundation pit on the retaining structure and surrounding environment were studied under the geological conditions of the confined aquifer on the east coast of Fenhe River.The causes of deep foundation pit accident were also analyzed systematically based on the monitoring data,and various emergency measures were proposed to control the occurrence of secondary accident for deep foundation pit.The results showed that the occurrence of inrush for foundation pit was mainly caused by the insufficient dewatering.The development of the accident was effectively controlled by the adding of the dewatering wells,local grouting of retaining structure to stop seepage,surface grouting to reinforcement and uplift soil.The successful experience can provide some guidance to the construction of similar projects in the proposal.展开更多
As an important component of the engineering optimization design system, the optimization design of deep foundation pit supporting has a vital influence on the construction quality and construction effect of engineeri...As an important component of the engineering optimization design system, the optimization design of deep foundation pit supporting has a vital influence on the construction quality and construction effect of engineering projects to a large extent. This paper studies and analyzes the optimization design of supporting structure of metro deep foundation pit for reference.展开更多
基金supported by the National Natural Science Foundation of China(51774199).
文摘To investigate the effect of deep foundation pit excavation on the stability of retaining structure, a subway stationin the city of Jinan was selected as a project, and a FLAC3D-based three dimensional model was developed fornumerical simulation. The horizontal displacement of the retaining structure, the axial force of the support, andthe vertical displacement of the column were studied and compared to the collected data from the field. The findingsindicate that when the foundation pit is excavated, the maximum deformation of the retaining structure progressivelydecreases from the top, the distortion of the retaining structure gradually rises, and the final maximumdeformation is around 17 meters deep. In each layer of support, the largest axial force support is located in thefirst reinforced concrete support;the uplift of the pit bottom caused by soil unloading plays a primary role in thevertical displacement of the column, and the column exhibits an upward trend under all construction conditions.When compared to the measured data, the generated findings are comparable and the fluctuation trend is extremelyconsistent. The findings of this article may give technical direction for the development of subway stationswith a comparable engineering basis.
文摘Subway project foundation pit internal drainage mainly uses the foundation pit dewatering and foundation pit drainage technology. Considering that the geological conditions of subway construction are not clear, well point dewatering, drainage and dewatering are usually used. Although the well point dewatering technology is very skilled, it is not suitable for all geological conditions, such as relatively fine particles, the geological effect is not obvious.
文摘This paper focuses on the content of a subway construction project, deeply studies the actual situation of the integrated construction technology of subway station and the foundation pit of adjacent buildings, and explores some integrated construction technologies that conform to the actual situation.
基金National Natural Science Foundation of China(No.51908516)Natural Science Foundation of Shanxi Province,China(No.201901D211207)。
文摘Taking the deep foundation pit accident occurring at a station of metro Line 2 in Taiyuan as an example,the influence of the seepage and inrush of the foundation pit on the retaining structure and surrounding environment were studied under the geological conditions of the confined aquifer on the east coast of Fenhe River.The causes of deep foundation pit accident were also analyzed systematically based on the monitoring data,and various emergency measures were proposed to control the occurrence of secondary accident for deep foundation pit.The results showed that the occurrence of inrush for foundation pit was mainly caused by the insufficient dewatering.The development of the accident was effectively controlled by the adding of the dewatering wells,local grouting of retaining structure to stop seepage,surface grouting to reinforcement and uplift soil.The successful experience can provide some guidance to the construction of similar projects in the proposal.
文摘As an important component of the engineering optimization design system, the optimization design of deep foundation pit supporting has a vital influence on the construction quality and construction effect of engineering projects to a large extent. This paper studies and analyzes the optimization design of supporting structure of metro deep foundation pit for reference.
文摘针对苏州轨道交通8号线采莲路站下穿既有轨道交通2号线高架桥深基坑工程,开展紧邻既有高架桥低净空下地铁车站深基坑施工数值模拟研究,并与实测结果进行对比,验证数值模拟方法的合理性.基于数值计算,研究围护结构、支撑体系参数和隔离桩设置等因素对桥桩变形的影响及变形控制措施.结果表明:可通过优化围护结构、支撑体系参数控制紧邻基坑的桥桩变形.影响程度为:围护结构厚度>围护结构材料(弹性模量)>钢支撑预加轴力,本基坑工程围护结构在原有厚度基础上增加至1.1倍、弹性模量选用35 GPa(C30混凝土)、钢支撑预加轴力65%以上更能有效控制桥桩变形.隔离桩结构参数是控制高架桥桩变形的关键因素,影响程度为:隔离桩与墩台距离>隔离桩深度>隔离桩材料>隔离桩厚度,低净空条件下优先选取钻孔灌注桩作为隔离桩,应设置于与既有高架桥墩相距4.5 m处,深度建议取基坑开挖深度1.4倍,厚度设置为0.55 m.
