A Reinforcement Method for Partition Rock Pillars in Shallow-Buried Small-Space Tunnels in Urban Areas

A small clear distance, shallow burial technology, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problems of large surface deformation and loss, and achieve the goals of controlling ground uplift and settlement, reducing impact, and improving strength and stability Effect

Inactive Publication Date: 2020-06-02
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complex environment of the subway tunnel, there are buildings on the surface, and various pipelines are buried in the overlying soil layer, if the grouting reinforcement process is not well controlled, resulting in excessive deformation of the surface, it will cause huge losses

Method used

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  • A Reinforcement Method for Partition Rock Pillars in Shallow-Buried Small-Space Tunnels in Urban Areas
  • A Reinforcement Method for Partition Rock Pillars in Shallow-Buried Small-Space Tunnels in Urban Areas
  • A Reinforcement Method for Partition Rock Pillars in Shallow-Buried Small-Space Tunnels in Urban Areas

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A method for reinforcing a partitioned rock pillar in an urban shallow-buried tunnel with a small clear distance, comprising the following steps:

[0036] (1) According to the width of the septum rock pillar and the stratum conditions, two rows of grouting holes are designed on the ground surface, and construction and drilling are carried out on the surface of the grouting holes; the construction drilling sequence is in accordance with the order of jumping holes in every row, and odd numbers are performed first. Drill holes in rows, and then use even rows of drilled holes as inspection holes or supplementary grouting holes according to the actual situation; the interval between rows of grouting holes is 1m.

[0037] (2) Combining the grouting design requirements and the depth of the target area, design and process the grouting pipe, make a round hole on the grouting pipe with reference to the grouting reinforcement target area, and bind the expansion mold bag at the same...

Embodiment 2

[0043] A method for reinforcing a partitioned rock pillar in a shallow-buried urban tunnel with a small clear distance, the steps of which are as described in Example 1, except that in step (1), the interval between rows of grouting holes is 2m.

Embodiment 3

[0045] A method for strengthening the middle rock pillar of an urban shallow-buried small-space tunnel, the steps of which are as described in Example 1, the difference being that in step (2), the grouting pipe is tied to the expansion mold bag in the first-level pressure isolation zone. Drill a round hole at the position, and inject liquid into the mold bag through the round hole; drill round holes at intervals along the axial direction of the grouting pipe on the grouting pipe located in the reinforcement area of ​​the septum rock pillar; the diameter of the round hole is 10mm, located in the reinforcement area of ​​the septum rock pillar The distance between the round holes on the grouting pipe is 20cm.

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Abstract

The invention relates to a method for a reinforcing rock pillar in a shallow buried tunnel with small spacing in a city, and belongs to the technical field of tunnel construction. The methods comprisethe step that by the arrangement of one or more rows of grouting holes, seamless steel pipes are used as grouting pipes according to the construction sequence of jumping holes at intervals, through the hole grouting to reinforce septum rock pillars, the grouting pipes is used as a supporting skeleton to effectively improve the stability of the septum rock pillars; by the binding of the multi-stage pressure separating expansion mold bag on the grouting pipes, slurry is controlled to spread in the target area, and at the same time, the effects that the uplift and settlement of ground can be controlled and the impact on the ground and the surrounding area of the ground can be reduced are achieved; grouting material based on the rapid solidification type slurry can adjust the slurry gel timeaccording to the real time feedback of the grouting process in the field, the over diffusion of the slurry is prevented, the cost is saved, and the segmented and localized reinforcement of the septumrock pillars can be achieved by the matching with the pressure separating expansion mold bag.

Description

technical field [0001] The invention relates to a method for reinforcing a rock pillar at the middle of a tunnel, in particular to a method for strengthening the rock pillar at the middle of a shallow-buried tunnel with a small net distance by localized control grouting, and belongs to the technical field of tunnel construction. Background technique [0002] With the rapid development of my country's urban economy and the continuous increase of urban population, the traffic pressure in large and medium-sized cities is increasing. As a convenient and fast transportation mode with large passenger capacity, the subway has become the key public transportation facility for most large and medium-sized cities. [0003] Due to limited urban space, the buried depth and spacing of subway tunnels are generally small, which brings a series of problems. Urban shallow soils are mostly poor soil types such as miscellaneous fill, loess, silty clay, and gravel soil. If effective reinforceme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/10
CPCE21D11/10
Inventor 张庆松安祺祎张霄李相辉郝彭帅尹占超段崇豪王子昂
Owner SHANDONG UNIV
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