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Construction method for excavation and unloading around existing tunnel
The construction method comprises the following steps that S1, according to geological exploration data and existing tunnel data, a deep and shallow buried boundary line or a pressure arch range line of the existing tunnel is obtained and serves as a protection critical line of the existing tunnel; s2, determining the thickness and range of a rock-soil layer to be excavated and unloaded around the existing tunnel according to the field design elevation requirement; s3, the position relation between the protection critical line of the existing tunnel and the to-be-excavated unloading range is compared in the plane direction and the vertical direction, and whether the to-be-excavated unloading range invades the protection critical line of the existing tunnel or not is judged; s4, a corresponding excavation method is adopted according to the invasion situation of the to-be-excavated unloading range on the periphery of the existing tunnel; the method is mainly based on the bearing capacity of the surrounding rock of the existing tunnel, the corresponding excavation unloading step sequence of the surrounding rock-soil body is reasonably selected, the characteristic of the bearing arch of the surrounding rock of the tunnel is effectively utilized, displacement deformation of the tunnel is reduced as much as possible, and it is guaranteed that excavation construction of the surrounding rock-soil body of the tunnel is rapidly conducted.
本发明公开了一种既有隧道周边开挖卸荷的施工方法，包括如下步骤：S1.根据地勘资料与既有隧道资料，得到既有隧道的深浅埋分界线或压力拱范围线并作为既有隧道的保护临界线；S2.根据场地设计高程要求，确定既有隧道周边拟开挖卸荷的岩土层厚度及范围；S3.在平面与竖直方向上对比既有隧道的保护临界线与拟开挖卸荷范围的位置关系，判断拟开挖卸荷范围是否侵入既有隧道的保护临界线；S4.根据既有隧道周边拟开挖卸荷范围的侵入情况，采取对应的开挖方法；本发明主要基于既有隧道周边围岩的承载能力，合理选用对应的周边岩土体开挖卸荷步序，并有效利用隧道围岩承载拱这一特性，尽可能减少隧道的位移变形，保证隧道周边的岩土体开挖施工的快速进行。
Construction method for excavation and unloading around existing tunnel
The construction method comprises the following steps that S1, according to geological exploration data and existing tunnel data, a deep and shallow buried boundary line or a pressure arch range line of the existing tunnel is obtained and serves as a protection critical line of the existing tunnel; s2, determining the thickness and range of a rock-soil layer to be excavated and unloaded around the existing tunnel according to the field design elevation requirement; s3, the position relation between the protection critical line of the existing tunnel and the to-be-excavated unloading range is compared in the plane direction and the vertical direction, and whether the to-be-excavated unloading range invades the protection critical line of the existing tunnel or not is judged; s4, a corresponding excavation method is adopted according to the invasion situation of the to-be-excavated unloading range on the periphery of the existing tunnel; the method is mainly based on the bearing capacity of the surrounding rock of the existing tunnel, the corresponding excavation unloading step sequence of the surrounding rock-soil body is reasonably selected, the characteristic of the bearing arch of the surrounding rock of the tunnel is effectively utilized, displacement deformation of the tunnel is reduced as much as possible, and it is guaranteed that excavation construction of the surrounding rock-soil body of the tunnel is rapidly conducted.
本发明公开了一种既有隧道周边开挖卸荷的施工方法，包括如下步骤：S1.根据地勘资料与既有隧道资料，得到既有隧道的深浅埋分界线或压力拱范围线并作为既有隧道的保护临界线；S2.根据场地设计高程要求，确定既有隧道周边拟开挖卸荷的岩土层厚度及范围；S3.在平面与竖直方向上对比既有隧道的保护临界线与拟开挖卸荷范围的位置关系，判断拟开挖卸荷范围是否侵入既有隧道的保护临界线；S4.根据既有隧道周边拟开挖卸荷范围的侵入情况，采取对应的开挖方法；本发明主要基于既有隧道周边围岩的承载能力，合理选用对应的周边岩土体开挖卸荷步序，并有效利用隧道围岩承载拱这一特性，尽可能减少隧道的位移变形，保证隧道周边的岩土体开挖施工的快速进行。
Construction method for excavation and unloading around existing tunnel
既有隧道周边开挖卸荷的施工方法
WANG YANG (author) / ZHANG WENZHENG (author) / ZENG HONGJING (author) / ZHOU HAIYING (author) / LI TAO (author) / LI LU (author) / MA JUN (author) / RAN MENGQIAO (author) / ZOU HANXUAN (author)
2023-09-29
Patent
Electronic Resource
Chinese
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