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A platform for research: civil engineering, architecture and urbanism
Method for controlling tunnel deformation through foundation pit vertically excavated over operating subway tunnel
The invention discloses a method for controlling tunnel deformation by a vertically excavated foundation pit of an overpass operation subway tunnel, which comprises the following steps of: 1, carrying out on-site investigation, and determining relative positions of the foundation pit, the tunnel and other structures; 2, arranging a monitoring instrument for the subway tunnel according to the relative position information obtained in the step 1; thirdly, construction of an enclosure structure is conducted, and the enclosure structure is made of cast-in-situ bored piles; 4, sleeve valve pipe grouting reinforcement is conducted on the soil body in the pit; fifthly, soil in the foundation pit is excavated according to the zoning and layering excavation sequence, and horizontal supports are erected in sequence; and sixthly, a bottom plate is poured after excavation is conducted to the designated depth. According to the method, on the basis of the space-time effect of foundation pit deformation, the soil body in the pit is excavated in a partitioned and layered mode, the unloading time of the underlying existing subway tunnel is shortened to the maximum degree, and the upheaval amount and deformation of the subway tunnel caused by foundation pit excavation are effectively and reasonably reduced.
本发明公开了一种上跨运营地铁隧道垂直开挖的基坑对隧道变形的控制方法，其包括以下步骤，步骤一：进行现场勘查，确定基坑、隧道以及其他构筑物的相对位置；步骤二：根据步骤一获取的所述相对位置信息，对地铁隧道布置监测仪器；步骤三：进行围护结构的施工，围护结构采用钻孔灌注桩；步骤四：对坑内土体采用袖阀管注浆加固；步骤五：采用分区分层开挖顺序进行基坑内土体开挖，并依次架设水平支撑；步骤六：开挖至指定深度后浇筑底板。本发明基于基坑变形的时空效应，对坑内土体进行“分区分层”开挖，最大程度地缩短下卧既有地铁隧道的卸荷时间，有效合理地减少基坑开挖引起的地铁隧道的隆起量和变形。
Method for controlling tunnel deformation through foundation pit vertically excavated over operating subway tunnel
The invention discloses a method for controlling tunnel deformation by a vertically excavated foundation pit of an overpass operation subway tunnel, which comprises the following steps of: 1, carrying out on-site investigation, and determining relative positions of the foundation pit, the tunnel and other structures; 2, arranging a monitoring instrument for the subway tunnel according to the relative position information obtained in the step 1; thirdly, construction of an enclosure structure is conducted, and the enclosure structure is made of cast-in-situ bored piles; 4, sleeve valve pipe grouting reinforcement is conducted on the soil body in the pit; fifthly, soil in the foundation pit is excavated according to the zoning and layering excavation sequence, and horizontal supports are erected in sequence; and sixthly, a bottom plate is poured after excavation is conducted to the designated depth. According to the method, on the basis of the space-time effect of foundation pit deformation, the soil body in the pit is excavated in a partitioned and layered mode, the unloading time of the underlying existing subway tunnel is shortened to the maximum degree, and the upheaval amount and deformation of the subway tunnel caused by foundation pit excavation are effectively and reasonably reduced.
本发明公开了一种上跨运营地铁隧道垂直开挖的基坑对隧道变形的控制方法，其包括以下步骤，步骤一：进行现场勘查，确定基坑、隧道以及其他构筑物的相对位置；步骤二：根据步骤一获取的所述相对位置信息，对地铁隧道布置监测仪器；步骤三：进行围护结构的施工，围护结构采用钻孔灌注桩；步骤四：对坑内土体采用袖阀管注浆加固；步骤五：采用分区分层开挖顺序进行基坑内土体开挖，并依次架设水平支撑；步骤六：开挖至指定深度后浇筑底板。本发明基于基坑变形的时空效应，对坑内土体进行“分区分层”开挖，最大程度地缩短下卧既有地铁隧道的卸荷时间，有效合理地减少基坑开挖引起的地铁隧道的隆起量和变形。
Method for controlling tunnel deformation through foundation pit vertically excavated over operating subway tunnel
上跨运营地铁隧道垂直开挖的基坑对隧道变形的控制方法
LIN LIHUA (author) / WANG XUEBIN (author) / JIANG ANLONG (author) / ZHANG XIAOQIAN (author) / LI MINGGUANG (author) / CHEN JINJIAN (author)
2023-05-23
Patent
Electronic Resource
Chinese
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