Anchor-pulling construction method suitable for sedimentation deformation of overlaying soil layer of shallow-buried tunnel

Abstract

The invention discloses an anchor-pulling construction method suitable for sedimentation deformation of an overlaying soil layer of a shallow-buried tunnel. The anchor-pulling construction method comprises the following steps that 1, pretreatment before tunnel excavation is conducted; 2, a grouting anchoring rod is constructed on each of the left portion and the right portion of the spandrel position of the overlaying soil layer of the tunnel; 3, foundation beams are constructed nearby the ground surface above the tunnel to fix anchoring heads of the anchoring rods; and 4, the tunnel is excavated through an upper-middle-lower three-step method. According to the anchor-pulling construction method, the anchoring rods are constructed on the spandrel position of the tunnel and connected with the foundation beams, anchoring force is exerted to the overlaying soil layer of the tunnel, and thus anchor-pulling effect is achieved; effective strengthening is conducted for avoiding loosening, andthe very good limiting and reducing effects are achieved on sedimentation deformation of the overlaying soil layer of the stratum shallow-buried tunnel; and the construction method is short in construction period, low in manufacturing cost and high in construction efficiency, unbalanced force generated in tunnel excavation can be dissipated, the strain state is adjusted, development of deformation is slowed down, the self-constraining effect is achieved, and the very good practical value is achieved.

Description

Technical field [0001] The invention belongs to the technical field of shallow-buried tunnel excavation methods, and specifically relates to a tension anchor construction method suitable for settlement and deformation of the overlying soil layer of a shallow-buried tunnel. Background technique [0002] In recent years, the intensification of urban population density has made the surface area more and more limited, and the ground transportation has become more and more congested, which has promoted the rapid popularization and progress of urban underground railways. With the increasing maturity of urban rail transit, both subway tunnels and road tunnels have been well developed in various regions, but more and more problems have arisen. [0003] The rapid development of the subway has undoubtedly alleviated the considerable traffic congestion problems in major cities and brought great convenience to people. However, there is a concern here. The buried depth of subways is generally ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an anchoring construction method suitable for the settlement and deformation of the overlying soil layer of the shallow buried tunnel, which solves the problem that the existing shallow buried tunnel is prone to the settlement and deformation of the overlying soil layer during excavation

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