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Blasting vibration limited rock tunnel excavation method

A technology of tunnel excavation and blasting vibration, which is applied in blasting, tunneling, earthwork drilling and mining, etc. It can solve the problems of high excavation cost, inability to dig hard rock, low hydraulic splitting efficiency of light tunnel boring machines, etc., and achieve high efficiency The effect of tunneling

Active Publication Date: 2016-10-12
NINGBO COMM PLANNING INST CO LTD +1
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AI Technical Summary

Problems solved by technology

[0002] The blasting vibration is limited during the construction of new short- and medium-length rock tunnels near or crossing or close to the high-speed railway, while the excavation cost of mechanical cutting (large tunnel boring machine) is too high, and the efficiency of light tunnel boring machine and hydraulic splitting is too low or excavation Without hard rock, it is difficult to meet the economic and efficiency problems of the construction of new short and medium-length rock tunnels near or crossing or close to high-speed railways

Method used

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  • Blasting vibration limited rock tunnel excavation method
  • Blasting vibration limited rock tunnel excavation method
  • Blasting vibration limited rock tunnel excavation method

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Embodiment Construction

[0034] The present invention will be further elaborated and illustrated below in conjunction with the accompanying drawings and specific embodiments. The technical features of the various implementations in the present invention can be combined accordingly on the premise that there is no conflict with each other.

[0035] In this embodiment, the excavation and support methods of the rock tunnel are as follows:

[0036] (1) Mechanically excavate the road cutting at the entrance of the hole and take preliminary protection and drainage measures;

[0037] (2) Do a good job of opening support or pre-support structure;

[0038] (3) According to the formulas (1.1), (1.2), (1.3), adjust the wall thickness of the plum blossom hole and the thickness of the splitting layer until it is suitable.

[0039] The density of the plum blossom-shaped hole and the determination method of the impact energy of the impact hammer are as follows:

[0040] S101: Determine the impact energy E of the i...

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Abstract

The invention discloses a blasting vibration limited rock tunnel excavation method. The method comprises the following steps: S1: drilling quincuncial holes similar to honeycomb briquette in the circumferential inner circle of a tunnel with a down-the-hole drill, and then impacting the quincuncial holes with an impact hammer to smash the quincuncial hole wall rock, thereby completing cyclic excavation of the inner circle rock of the tunnel; and S2: adopting air drill punching and splitting blasting for the circumferential rock of the tunnel to complete rock tunnel excavation. The rock tunnel excavation method disclosed by the invention can carry out efficient tunnel excavation to the maximum under the condition that a large tunnel boring machine is not used, and the method considers the problems of economy and efficiency in short length rock tunnel construction near a high-speed railway or crossing or near a blasting vibration limited new building.

Description

technical field [0001] The invention belongs to the field of engineering construction and relates to a rock tunnel excavation support technology with limited blasting vibration. Background technique [0002] The blasting vibration is limited during the construction of new short- and medium-length rock tunnels near or crossing or close to the high-speed railway, while the excavation cost of mechanical cutting (large tunnel boring machine) is too high, and the efficiency of light tunnel boring machine and hydraulic splitting is too low or excavation Without hard rock, it is difficult to meet the economic and efficiency problems of the construction of new short- and medium-length rock tunnels near or crossing or approaching high-speed railways. Contents of the invention [0003] The object of the present invention is to solve the problems existing in the prior art and provide a rock tunnel excavation method with limited blasting vibration. [0004] A rock tunnel excavation m...

Claims

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Application Information

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IPC IPC(8): E21D9/00F42D1/00F42D1/08F42D3/04
CPCE21D9/006F42D1/00F42D1/08F42D3/04
Inventor 朱汉华陈孟冲牛富生
Owner NINGBO COMM PLANNING INST CO LTD
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