A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Excavation method for asymmetric foundation pits on two sides of arc subway tunnel
The invention discloses an excavation method for asymmetric foundation pits on the two sides of an arc subway tunnel. The excavation method comprises the steps that S100, a foundation pit is divided into a plurality of sections; s200, dividing the section into a plurality of running water construction areas; and S300, the running water construction area is divided into a plurality of running water construction sections. In the scheme, through zoning and layering recursive excavation and step-by-step unloading, the deformation risk of a foundation pit support structure and an operation subway tunnel caused by the influence of the space-time effect in the foundation pit soil body excavation construction process is reduced, the axial-force-free support exposure time of the foundation pit is shortened, and the construction efficiency is improved. The anti-overturning rigidity and the axial bearing strength of the foundation pit support structure can be improved more quickly; the earthwork construction sequence is set through simulation calculation, the area with unbalanced lateral pre-excavation loads is set as a post-excavation section, loads on the two sides are balanced through indwelling earthwork so as to balance unloading space-time responses on the two sides of a tunnel, displacement deformation disasters caused by single-side concentrated overload are avoided, and the construction efficiency is improved. And the disaster-causing effect of construction dynamic disturbance on an operation subway tunnel structure is relieved.
本发明公开了一种弧线地铁隧道双侧非对称基坑的开挖方法，包括：S100、将基坑分为多个标段；S200、将标段分为多个流水施工区；S300、将流水施工区分为多个流水施工段。在本方案中，通过分区、分层递推开挖并逐级卸荷，降低在基坑土体开挖施工过程中受时空效应影响产生的基坑围护结构和运营地铁隧道的变形风险，减少基坑无轴力支撑暴露时间，能够更快地提升基坑围护结构抗倾覆刚度以及轴向承载强度；通过模拟计算设置土方施工顺序，其中侧向预开挖荷载不平衡的区域设置为后开挖标段，利用留置土方平衡双侧荷载，以平衡隧道两侧卸载时空响应，避免单侧集中过载导致位移形变灾害，缓解施工动态扰动对运营地铁隧道结构的致灾效应。
Excavation method for asymmetric foundation pits on two sides of arc subway tunnel
The invention discloses an excavation method for asymmetric foundation pits on the two sides of an arc subway tunnel. The excavation method comprises the steps that S100, a foundation pit is divided into a plurality of sections; s200, dividing the section into a plurality of running water construction areas; and S300, the running water construction area is divided into a plurality of running water construction sections. In the scheme, through zoning and layering recursive excavation and step-by-step unloading, the deformation risk of a foundation pit support structure and an operation subway tunnel caused by the influence of the space-time effect in the foundation pit soil body excavation construction process is reduced, the axial-force-free support exposure time of the foundation pit is shortened, and the construction efficiency is improved. The anti-overturning rigidity and the axial bearing strength of the foundation pit support structure can be improved more quickly; the earthwork construction sequence is set through simulation calculation, the area with unbalanced lateral pre-excavation loads is set as a post-excavation section, loads on the two sides are balanced through indwelling earthwork so as to balance unloading space-time responses on the two sides of a tunnel, displacement deformation disasters caused by single-side concentrated overload are avoided, and the construction efficiency is improved. And the disaster-causing effect of construction dynamic disturbance on an operation subway tunnel structure is relieved.
本发明公开了一种弧线地铁隧道双侧非对称基坑的开挖方法，包括：S100、将基坑分为多个标段；S200、将标段分为多个流水施工区；S300、将流水施工区分为多个流水施工段。在本方案中，通过分区、分层递推开挖并逐级卸荷，降低在基坑土体开挖施工过程中受时空效应影响产生的基坑围护结构和运营地铁隧道的变形风险，减少基坑无轴力支撑暴露时间，能够更快地提升基坑围护结构抗倾覆刚度以及轴向承载强度；通过模拟计算设置土方施工顺序，其中侧向预开挖荷载不平衡的区域设置为后开挖标段，利用留置土方平衡双侧荷载，以平衡隧道两侧卸载时空响应，避免单侧集中过载导致位移形变灾害，缓解施工动态扰动对运营地铁隧道结构的致灾效应。
Excavation method for asymmetric foundation pits on two sides of arc subway tunnel
弧线地铁隧道双侧非对称基坑的开挖方法
ZUO HONGJI (author) / ZHENG XIAOCHUAN (author) / HU XIYANG (author) / WANG MINGJIE (author)
2024-11-12
Patent
Electronic Resource
Chinese
IPC:
E02D
FOUNDATIONS
,
Gründungen
| European Patent Office | 2021
Excavation construction method for deep foundation pits on two sides of existing building
| European Patent Office | 2024
| Springer Verlag | 2024
Rapid construction method for stripping excavation of foundation pit on subway tunnel
| European Patent Office | 2023