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Determination method for optimal thickness of protection layer reserved for retaining piles in deep foundation pit blasting construction

A determination method and technology of protective layer, applied in the direction of foundation structure engineering, foundation structure test, excavation, etc., can solve the problem that the safety of the fencing piles cannot be well guaranteed, the construction safety and reliability cannot be guaranteed, and the engineering benefits cannot be guaranteed. Maximize blasting construction efficiency and benefits, improve construction efficiency and benefits, and avoid workload effects

Inactive Publication Date: 2018-06-19
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method often has a certain degree of blindness and cannot guarantee the safety and reliability of construction.
A too small protective layer cannot better guarantee the safety of the retaining piles, and an excessively large protective layer cannot maximize the project benefits

Method used

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  • Determination method for optimal thickness of protection layer reserved for retaining piles in deep foundation pit blasting construction
  • Determination method for optimal thickness of protection layer reserved for retaining piles in deep foundation pit blasting construction

Examples

Experimental program
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Embodiment 1

[0035] A method for determining the optimal thickness of the protective layer reserved for retaining piles in deep foundation pit blasting construction. The method for determining the optimal thickness of the reserved protective layer described in this embodiment is:

[0036] step 1

[0037] 1.1, such as figure 1 with figure 2 As shown, the optimal range for determining the optimal thickness δ of the reserved protective layer 2 is 0.3-0.8a, where a indicates that the distance between the blast holes 3 is 3000mm, that is, the optimal range of the optimal thickness δ of the reserved protective layer 2 is 900mm-2400mm.

[0038] 1.2. Determine the optimal thickness δ of the reserved protective layer 2 to be optimized to be 6, then reserve the i-th preferred thickness δ of the optimal thickness δ of the protective layer 2 i The i-1th to-be-optimized thickness δ of the optimal thickness δ of the adjacent reserved protective layer 2 i-1 thickness difference Reserve the optimal...

Embodiment 2

[0059] A method for determining the optimal thickness of the protective layer reserved for retaining piles in deep foundation pit blasting construction. The method for determining the optimum protective layer thickness described in the present embodiment is:

[0060] step 1

[0061] 1.1, such as figure 1 with figure 2 As shown, the optimal range for determining the optimal thickness δ of the reserved protective layer 2 is 0.3-0.8a, where a indicates that the distance between the blast holes 3 is 3000mm, that is, the optimal range of the optimal thickness δ of the reserved protective layer 2 is 900mm-2400mm.

[0062] 1.2. There are 11 to-be-optimized thicknesses reserved for the optimal thickness δ of the protective layer 2, then the i-th preferred thickness δ of the optimal thickness δ of the reserved protective layer 2 i The i-1th to-be-optimized thickness δ of the optimal thickness δ of the adjacent reserved protective layer 2 i-1 thickness difference in:

[0063] δ ...

Embodiment 3

[0087] A method for determining the optimal thickness of the protective layer reserved for retaining piles in deep foundation pit blasting construction. The method for determining the optimum protective layer thickness described in the present embodiment is:

[0088] step 1

[0089] 1.1, such as figure 1 and figure 2 As shown, the optimal range for determining the optimal thickness δ of the reserved protective layer 2 is 0.3-0.8a, where a indicates that the hole distance of the blast hole 3 is 3500mm; that is, the optimal range of the optimal thickness δ of the reserved protective layer 2 is 1050mm-2800mm.

[0090] 1.2. Determine the optimal thickness δ of the reserved protective layer 2 to be optimized to be 21, then the i-th preferred thickness δ of the reserved protective layer 2 i The i-1th thickness δ to be optimized with the adjacent reserved protective layer 2 i-1 thickness difference in:

[0091] δ 0 The initial thickness to be optimized to reserve the optimal...

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Abstract

The invention discloses a determining method for the optimum thickness of a guard post reserved protection layer in deep foundation pit blasting construction. The number of to-be-optimized thicknesses of the optimum thickness delta of the reserved protection layer (2) is set to be n+1 within the optimal range of the optimum thickness delta of the reserved protection layer (2); then according to a blasthole (3), explosive (4), the n+1 to-be-optimized thicknesses of the optimum thickness delta of the reserved protection layer (2) and a finite element model of a guard post (1), the pressure peak Fci and the tension peak Fti applied to the guard post (1) under the action of the blast load are obtained sequentially; and then the pressure peak Fci is compared with the compression bearing capacity [Fc] of the guard post (1), the tension peak Fti is compared with the tension capacity [Ft] of the guard post (1), and the corresponding i to-be-optimized thickness delta i which first meets the requirements that the pressure peak Fci is smaller than the compression bearing capacity [Fc] and the tension peak Fti is smaller than the tension capacity [Ft] is the optimum thickness delta of the reserved protection layer (2). The determining method can meet the actual bearing requirement and can also ensure the excavation safety of a deep foundation pit, high efficiency and maximum benefit.

Description

technical field [0001] The invention belongs to the technical field of deep foundation pit earthwork blasting. In particular, the invention relates to a method for determining the optimal thickness of a protective layer reserved for retaining piles in deep foundation pit blasting construction. Background technique [0002] With the demand for higher and higher urban building heights, a large number of deep foundation pit projects have been produced. During the excavation process of foundation pits, enclosure piles are widely used to protect the stability of foundation pits. However, the huge energy released at the moment of explosion during blasting and excavation usually threatens the safety and stability of the retaining piles. Therefore, during the construction process, a part of the protective layer is usually reserved between the excavated part and the surrounding piles to attenuate the shock wave generated by the explosion. This part of the reserved protective layer ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D17/04E02D33/00
CPCE02D17/04E02D33/00
Inventor 钟冬望司剑峰李琳娜何理涂圣武陈晨黄雄卢哲
Owner WUHAN UNIV OF SCI & TECH
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