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Segmented blasting hole excavation construction method for reconstruction and expansion of tunnel through karst landform water conservancy extra-small section

A segmented blasting and karst technology, applied in blasting, tunnels, mining equipment, etc., can solve problems such as complex geological conditions, affecting tunnel construction safety and later use functions, construction safety hazards, etc., to achieve simple and efficient construction machinery and equipment The effect of safe application range and simple construction work

Active Publication Date: 2020-07-31
中铁贵州工程有限公司
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Problems solved by technology

Seriously affect the safety of tunnel construction and later use functions. In addition, the geological conditions are complex, and there are unfavorable geological bodies such as mud layer, karst development, and broken surrounding rocks. There is a great security risk

Method used

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  • Segmented blasting hole excavation construction method for reconstruction and expansion of tunnel through karst landform water conservancy extra-small section
  • Segmented blasting hole excavation construction method for reconstruction and expansion of tunnel through karst landform water conservancy extra-small section
  • Segmented blasting hole excavation construction method for reconstruction and expansion of tunnel through karst landform water conservancy extra-small section

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Embodiment Construction

[0037] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only a part of the embodiments of the present invention, not all of them.

[0038] The segmental blasting excavation construction method for reconstruction and expansion of tunnels with ultra-small sections in karst landforms and water conservancy is used for reconstruction and expansion of original tunnels. The original tunnels are ultra-small sections, and the excavation section design of new tunnels adopts the city gate type; it includes the following steps:

[0039] S1. On-site survey and investigation of the surrounding rocks of the original tunnel, confirming that the surrounding rocks are classified as IV or V. The vertical fissures of many rock masses in the surrounding rocks are relatively developed, the karst is relatively developed, and the local rock masses are b...

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Abstract

The invention discloses a segmented blasting hole excavation construction method for reconstruction and expansion of a tunnel through a karst landform water conservancy extra-small section. The segmented blasting hole excavation construction method is used for reconstruction and expansion of an original tunnel. The original tunnel is the extra-small section, and the excavation section is designedto be in a city door hole type. The segmented blasting hole excavation construction method comprises the following steps that S1, on-site reconnaissance and investigation are conducted on surroundingrock of the original tunnel, the existing state of the surrounding rock is actually mastered, and the category classification of the surrounding rock is confirmed to be IV or V; S2, advanced reinforcement is conducted on the existing state of the existing surrounding rock found through investigation in the step S1; and S3, classified blasting and segmented blasting of the same tunnel face are conducted on excavated different surrounding rock tunnel faces. A segmented blasting method in the step S3 comprises the steps that firstly, the top part of the original tunnel is excavated through blasting, and then a side wall and an inverted arch are excavated through blasting; or the position of the side wall is blasted firstly, and then the position of an arch crown is detonated. The segmented blasting hole excavation construction method has the characteristics of being safe, reliable, easy to construct and operate, remarkable in economic benefit and the like, can be widely applied to the field of water conservancy, mine and underground engineering widening construction, and is wide in application and popularization prospect.

Description

technical field [0001] The invention relates to a tunnel construction method, in particular to a subsection blasting hole excavation construction method for rebuilding and expanding tunnels with special small sections in karst landforms. Background technique [0002] When the karst landform tunnel was expanded, the surrounding rocks of the original tunnel were mainly of type V~IV through field investigation. Since the site area is located in the karst landform belt, the vertical fractures of many rock masses in the surrounding rocks are relatively developed, and the karst is relatively developed. broken body. The development of fissures, coupled with the poor control of the blasting charge in the original tunnel, aggravated the further fragmentation of the surrounding rock. The position of the axis of the original tunnel body is very random, with almost no straight line. It basically belongs to the situation where the axis of the tunnel is where the original excavation and ...

Claims

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Application Information

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IPC IPC(8): E21D9/01F42D1/00F42D3/04
CPCE21D9/01E21D9/006F42D1/00F42D3/04
Inventor 晁增福纪曲波王军李坊森杨建华
Owner 中铁贵州工程有限公司
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