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Construction technology for retaining wall of complex stratum

A construction technique and technology for complex formations, applied in the direction of reciprocating drilling rigs, drilling equipment and methods, drilling compositions, etc., can solve problems such as insufficient limitations of hole walls in complex formations

Pending Publication Date: 2021-07-30
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a complex formation retaining wall construction technology to solve the limitations and deficiencies in the existing complex formation hole wall instability treatment

Method used

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  • Construction technology for retaining wall of complex stratum
  • Construction technology for retaining wall of complex stratum
  • Construction technology for retaining wall of complex stratum

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Embodiment Construction

[0024] see Figure 1 to Figure 5 Shown:

[0025] Step 1. Preparation of loess retaining wall material 1: The natural moisture content of the loess used is 21.5%, the liquid limit is 30.2%, and the plastic limit is 22.1%. After the loess moisture content is modulated between 24%-28%, the mass ratio is loess:lime: Fly ash = 7:1:2 to prepare loess wall protection material 1;

[0026] Step two, see figure 1 , due to the hard and broken strata, the pneumatic down-the-hole hammer 2 drilling technology is used to drill the hole to 3-4m, the diameter of the drill pipe 3 used is Φ89mm, and the diameter of the drill bit is Φ140mm;

[0027] Step 3. Slowly lift the drill pipe 3, take out the pneumatic down-the-hole hammer 2 from the hole, and replace it with a conical drill bit with a diameter of Φ140mm;

[0028] Step 4, see figure 2 Slowly inject the loess wall protection material 1 into the hole to ensure that the loess wall protection material 1 is filled in the newly drilled hole...

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Abstract

The invention discloses a construction technology for a retaining wall of a complex stratum. The construction technology for the retaining wall of the complex stratum comprises the steps that S1, a loess retaining wall material is prepared; S2, drilling is conducted through a pneumatic down-the-hole hammer drilling technology; S3, a conical drill bit is replaced; S4, the loess wall retaining material is poured into a newly-drilled hole section; S5, the conical drill bit is put down; S6, a loess material reinforcing layer is formed on a hole wall; and S7, the S1 to the S6 are repeated till the designed hole depth is achieved through operation. The construction technology for the retaining wall of the complex stratum has the beneficial effect that the cost is low; the conical drill bit is adopted to compact and reinforce the loess wall retaining material, a mixture of fly ash, loess and lime is extruded into fractures of broken rocks, and a hydration reaction is carried out to form lime-soil hardened substances which are attached to the surface of a fracture of the hole wall to form a hole wall reinforcing layer with certain strength after compaction, so that the effect of protecting the hole wall is achieved, and technical support is provided for smooth implementation of a construction plan and acquisition of comprehensive geological data.

Description

technical field [0001] The invention relates to a construction technology, in particular to a construction technology for complex stratum retaining walls. Background technique [0002] At present, mine exploration and mining will inevitably form boreholes. The formation of boreholes destroys the force balance of rock and soil, redistributes the stress of rock and soil within a certain range around the hole wall, and produces local stress concentration. The hole wall is very easy to be unstable and damaged, generally manifested as collapse, falling blocks and shrinking diameter. In loose and broken formations, sandy pebble layers, slag accumulation layers and other complex formations, geological drilling has the problem of hole wall instability. The collapse of the borehole will cause the drill tool to be unable to be lifted out of the formation in serious cases, resulting in damage to the borehole and abandonment of the drill tool, which will bring greater economic losses t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/00E21B1/00E21B3/00E21B33/13C09K8/504
CPCE21B7/00E21B1/00E21B3/00E21B33/13C09K8/5045Y02W30/91
Inventor 王茂森韦昭杰郭明义博坤
Owner JILIN UNIV
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