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A wall-mounted surrounding rock section blasting excavation method for tunnels in karst areas

A wall-mounted, surrounding rock technology, used in tunnels, earth-moving drilling, mining equipment, etc., can solve the problems of cave collapse, tunnel outline over-excavation, etc., and achieve the effect of weakening energy

Active Publication Date: 2018-09-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In rare super-large karst areas, due to the extremely complex geological conditions of the karst area through which the tunnel passes, great care must be taken when excavating the karst section of the tunnel. Conventional blasting may cause large-scale cave collapse and tunnel contour overexcavation , how to effectively control the blasting effect on the basis of traditional blasting, minimize contour overbreak and karst cavity disturbance, and at the same time ensure construction quality and economic benefits has become a new challenge for karst tunnel blasting construction

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  • A wall-mounted surrounding rock section blasting excavation method for tunnels in karst areas
  • A wall-mounted surrounding rock section blasting excavation method for tunnels in karst areas
  • A wall-mounted surrounding rock section blasting excavation method for tunnels in karst areas

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Embodiment Construction

[0031] In order to more clearly introduce the technical solutions involved in the present invention, further description will be given below in conjunction with the accompanying drawings.

[0032] The schematic diagram of this embodiment is shown in Figure 1 to Figure 3 , figure 1 Among them, 10 is the empty area of ​​karst cave, and 11 is the backfilling of the empty area. The intersection of the tunnel outline and the karst empty area is easily disturbed by blasting construction, and there are potential safety hazards; figure 2 In the middle, the empty eye represents the shock-reducing eye, and the solid eye is the auxiliary eye and the peripheral eye in turn; image 3 , the number marked on the edge of the hole is the corresponding segment of the blasting detonator. This embodiment is only illustrative, not intended to limit the scope of the present invention.

[0033] see figure 1 , figure 2 , image 3 and Figure 4 , the blasting excavation method of the wall-mo...

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Abstract

The invention discloses a wall-hanging surrounding rock section blasting excavation method for tunnels in karst areas. The wall-hanging surrounding rock section blasting excavation method is characterized in that shot holes comprise arc-shaped auxiliary holes uniformly distributed in surrounding rock and peripheral holes on the counter line; the first row of auxiliary holes are formed from the bottom of the wall-hanging surrounding rock; from the first row of auxiliary holes, three rows of equally-spaced auxiliary holes are formed in the direction of the counter line from the inside out; vibration reduction holes are formed between the auxiliary holes; the peripheral holes are formed in the area of the counter line, distributed in an equally-spaced manner, and high-density in edge and regular in middle; decoupling charging is performed on the auxiliary holes and the peripheral holes, and the auxiliary holes and the peripheral holes are charged with different charging coefficients respectively; the auxiliary holes and the peripheral holes are connected through a parallel net, and a detonating tube blasting system is utilized to control millisecond detonating; and the blasting sequence is that the auxiliary holes are blasted from the inside out and the peripheral holes are blasted from the middle to two sides. The wall-hanging surrounding rock section blasting excavation method effectively controls the blasting effect, maximally reduces outline overexcavation and karst cavity perturbation, and meanwhile, guarantees the construction quality and the economical benefits on the basis of traditional blasting.

Description

technical field [0001] The invention relates to a tunnel excavation method, in particular to a wall-mounted surrounding rock section blasting excavation method for a tunnel in a karst section. Background technique [0002] Usually, the excavation of highway tunnel projects will adopt the drilling and blasting method for construction. Although the blasting construction technology can bring certain benefits to the project in terms of cost and construction period, it is difficult to control the intensity of traditional blasting and will affect the surrounding rock. A large degree of disturbance is generated, so it cannot be applied to tunnel engineering with some special geological conditions. [0003] At present, with the expansion of my country's high-grade highways to the southwest, tunnel engineering will inevitably encounter karst areas. In rare super-large karst areas, due to the extremely complex geological conditions of the karst area through which the tunnel passes, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00
CPCE21D9/006
Inventor 蒋冲沙策陈骅伟刘霖陈兆李煜谢寒松
Owner CENT SOUTH UNIV
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