In order to reduce the horizontal crossing transportation problems between coal trucks and stripping trucks,large and small vehicles,and transport trucks and belt conveyors at key points of open pit mine in production...In order to reduce the horizontal crossing transportation problems between coal trucks and stripping trucks,large and small vehicles,and transport trucks and belt conveyors at key points of open pit mine in production,the separate transportation mode of underpass bridge and overpass steel trestle is proposed to optimize the open pit development transportation system,so as to solve the practical problems that the horizontal cross of transport vehicles causes vehicle blockage,affects production schedule and production safety.The results show that the horizontal crossing road can be changed into a separate type of overpass steel trestle,which can realize the classified transportation of large and small vehicles,reduce the traffic density,make vehicles with different functions go their own way,eliminate the hidden danger of traffic accidents,and improve the production efficiency.展开更多
As the urban populations grow,the number and size of subway construction projects are increasing while also meeting higher construction standards.So,subway construction projects must have a better understanding of con...As the urban populations grow,the number and size of subway construction projects are increasing while also meeting higher construction standards.So,subway construction projects must have a better understanding of construction technology.This article focuses on the construction technology of the subway tunnel expansion under the bridge foundation.By analyzing the engineering characteristics of the bridge foundation and using a project as an example,this article provides a detailed discussion of the construction process of tunnel expansion under a bridge foundation.This article aims to serve as a reference for subway tunnel construction in China to ensure the key points of construction technology are understood,thus improving construction quality and laying a solid technical foundation for the sustainable development of urban rail engineering.展开更多
[目的]研究地铁隧道近距离下穿施工对既有地铁车站及高架桩基的影响。[方法]以合肥S1线五里墩站安全线隧道施工近距离下穿既有地铁2号线五里墩站为背景,利用有限元软件ABAQUS对项目施工全过程进行三维建模,对比分析了逐线开挖和两线同...[目的]研究地铁隧道近距离下穿施工对既有地铁车站及高架桩基的影响。[方法]以合肥S1线五里墩站安全线隧道施工近距离下穿既有地铁2号线五里墩站为背景,利用有限元软件ABAQUS对项目施工全过程进行三维建模,对比分析了逐线开挖和两线同时开挖两种方案下车站结构和高架桩基的变形。为考察类似工程在不同土体条件下的适用性,通过改变隧道处土体黏聚力和弹性模量两参数,分析了两参数在隧道开挖过程中对土体以及车站底板沉降的影响。[结果及结论]隧道开挖完成后,2号线五里墩站底板在两种方案下的最大沉降相近,分别为0.73 mm和0.77mm,均满足控制标准要求;当土体的黏聚力和弹性模量分别小于70 k Pa和100 MPa时,隧道开挖过程中车站结构的沉降和桩基的水平位移开始显著增大,应对此引起重视。展开更多
文摘In order to reduce the horizontal crossing transportation problems between coal trucks and stripping trucks,large and small vehicles,and transport trucks and belt conveyors at key points of open pit mine in production,the separate transportation mode of underpass bridge and overpass steel trestle is proposed to optimize the open pit development transportation system,so as to solve the practical problems that the horizontal cross of transport vehicles causes vehicle blockage,affects production schedule and production safety.The results show that the horizontal crossing road can be changed into a separate type of overpass steel trestle,which can realize the classified transportation of large and small vehicles,reduce the traffic density,make vehicles with different functions go their own way,eliminate the hidden danger of traffic accidents,and improve the production efficiency.
文摘As the urban populations grow,the number and size of subway construction projects are increasing while also meeting higher construction standards.So,subway construction projects must have a better understanding of construction technology.This article focuses on the construction technology of the subway tunnel expansion under the bridge foundation.By analyzing the engineering characteristics of the bridge foundation and using a project as an example,this article provides a detailed discussion of the construction process of tunnel expansion under a bridge foundation.This article aims to serve as a reference for subway tunnel construction in China to ensure the key points of construction technology are understood,thus improving construction quality and laying a solid technical foundation for the sustainable development of urban rail engineering.
文摘[目的]研究地铁隧道近距离下穿施工对既有地铁车站及高架桩基的影响。[方法]以合肥S1线五里墩站安全线隧道施工近距离下穿既有地铁2号线五里墩站为背景,利用有限元软件ABAQUS对项目施工全过程进行三维建模,对比分析了逐线开挖和两线同时开挖两种方案下车站结构和高架桩基的变形。为考察类似工程在不同土体条件下的适用性,通过改变隧道处土体黏聚力和弹性模量两参数,分析了两参数在隧道开挖过程中对土体以及车站底板沉降的影响。[结果及结论]隧道开挖完成后,2号线五里墩站底板在两种方案下的最大沉降相近,分别为0.73 mm和0.77mm,均满足控制标准要求;当土体的黏聚力和弹性模量分别小于70 k Pa和100 MPa时,隧道开挖过程中车站结构的沉降和桩基的水平位移开始显著增大,应对此引起重视。
