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A construction method for strengthening the core soil and glass fiber anchor rods of shallow-buried collapsible loess tunnels

A technology of collapsible loess and construction methods, which is applied in tunnels, installation of bolts, earthwork drilling and mining, etc., can solve problems such as intrusion of support structures in tunnels, instability of surrounding buildings, slow construction progress, etc., and achieve improvement Soil compression and shear resistance, speed up construction progress, and reduce engineering investment

Active Publication Date: 2019-03-19
JINAN URBAN CONSTR GRP
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Problems solved by technology

In tunnel construction, in order to avoid major accidents such as large-scale landslides and surface subsidence that cause intrusion of support structures in the tunnel, damage to pipelines, and instability of surrounding buildings, the method of geological treatment for collapsible loess currently includes the middle partition wall method. (CD method), cross partition wall method (CRD method), etc., but the construction progress of these methods is slow and the project investment is large

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  • A construction method for strengthening the core soil and glass fiber anchor rods of shallow-buried collapsible loess tunnels
  • A construction method for strengthening the core soil and glass fiber anchor rods of shallow-buried collapsible loess tunnels
  • A construction method for strengthening the core soil and glass fiber anchor rods of shallow-buried collapsible loess tunnels

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Embodiment Construction

[0027] Specific embodiments of the present invention are provided below, and it should be noted that the present invention is not limited to the following specific embodiments, and all equivalent transformations done on the basis of the technical solutions of the present application all fall within the scope of protection of the present invention.

[0028] A construction method for reinforcing the core soil of a shallow-buried collapsible loess tunnel with glass fiber anchor rods, comprising the following steps:

[0029] (1) Construction preparation

[0030] ①Preparation of tunnel displacement monitoring equipment with up to standard accuracy. The tunnel displacement monitoring equipment includes digital display convergence gauge, level gauge and sliding longitudinal micrometer;

[0031] ②Prepare the small conduit 3 for advance grouting. The small conduit 3 for advance grouting is a hot-rolled seamless steel pipe of Φ42mm, where Φ indicates a diameter, length 4.5m, and wall th...

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Abstract

The invention belongs to the technical field of urban tunnel underground excavation construction, and particularly relates to a shallow-buried collapsible loess tunnel core soil and glass fiber anchorrod reinforcing construction method. Advanced core soil is reinforced by utilizing glass fiber grouted anchor rods, the compressive and shearing resistance ability of the advanced core soil is improved, extruding deformation of a soil body in front of a tunnel face is restricted, a reinforcing area formed by the glass fiber grouted anchor rods and advanced grouting small guiding pipes has the function of water resistance, the consolidation settlement speed of upper collapsible loess is slowed down, meanwhile, the glass fiber grouted anchor rods are easy to cut, and tunnel tunneling excavationis not affected. The core soil is reserved to exert reverse thrust to restrict strain release of stress of the front soil body, in addition, the advanced grouting small guiding pipes can form a supporting arch ring on the upper part, and collapse of soil blocks is reduced.

Description

technical field [0001] The invention belongs to the technical field of underground excavation construction of urban tunnels, and in particular relates to a construction method for reinforcing the core soil and glass fiber anchor rods of a shallow-buried collapsible loess tunnel. Background technique [0002] Collapsible loess is a kind of unsaturated under-pressure dense soil with large pores and vertical joints. Under natural humidity, its compressibility is low and its strength is high, but when it is wetted by water, the strength of the soil is significantly reduced. The collapsing deformation caused by the additional pressure and the self-weight pressure of the soil is a kind of unstable deformation with large sinking amount and fast sinking speed, which is very harmful to buildings. The subsidence of the foundation due to the collapsibility of the loess has always been a typical engineering geological problem in the loess area. In tunnel construction, in order to avoid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00E21D11/10E21D20/02
CPCE21D9/00E21D11/105E21D20/021
Inventor 刘子松吴建亮高皓然刘洋曲凡峰
Owner JINAN URBAN CONSTR GRP
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