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Hydraulic fracturing combined hydraulic blasting roadway large-size tunneling method and fracturing device

A technology of large footage and hydraulic fracturing of blasting roadway, applied in blasting, tunneling, earthwork drilling and other directions, can solve problems such as difficulty in controlling the contour shape of the excavation surface, affecting the excavation speed, and increasing the construction cost, so as to avoid uncertainty. , the effect of improving efficiency and increasing the number of disturbances

Pending Publication Date: 2020-01-24
HENAN POLYTECHNIC UNIV
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AI Technical Summary

Problems solved by technology

[0003] The main disadvantage of the existing technical solution is that it is difficult to control the contour shape of the excavation surface by the blasting of five drill holes arranged on the excavation surface, and at the same time, under-excavation is very likely to occur, which greatly affects the excavation speed, thereby increasing the construction cost

Method used

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  • Hydraulic fracturing combined hydraulic blasting roadway large-size tunneling method and fracturing device
  • Hydraulic fracturing combined hydraulic blasting roadway large-size tunneling method and fracturing device
  • Hydraulic fracturing combined hydraulic blasting roadway large-size tunneling method and fracturing device

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Embodiment 1

[0065] use as Figure 5 The blasting hole layout shown in the blasting excavation construction includes the peripheral outline blasting hole 1 arrangement layer a, and the broken blasting hole 3 arrangement layers b, c, d, e; during the blasting construction, the coal The drilling sequence of the holes is a-b-c-d-e, that is, the drilling and blasting of the layout layer a of the contour blasthole 1 is carried out first; then check whether the coal and rock fragmentation meets the mechanical mining conditions, and if not, proceed to the arrangement of the broken blasthole 3 Drilling and blasting of layer b; then check the fragmentation degree of coal and rock, and when the conditions for mechanical mining are not met, then drill and blast the layer c where the broken blasting holes are arranged, and so on according to this principle, until the crushing blasting is carried out Drilling and blasting of hole 3 arrangement layer e. There is no corresponding relationship between th...

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Abstract

The invention belongs to the technical field of roadway tunneling, and particularly relates to a hydraulic fracturing combined hydraulic blasting roadway large-size tunneling method and a fracturing device. Firstly, contour blasting holes are arranged on a working contour surface, a combined fracturing method combining hydraulic fracturing-burst fracturing-hydraulic fracturing is adopted, a largecrack is formed on the working contour surface of a tunnel firstly, a mining area and a non-mining area are separated, the expansion of cracks in other directions is effectively prevented, the depth and the width of the crack extension are greatly improved, the hard coal rock becomes more loose, mining is facilitated, and the air permeability of coal seams can be improved. In addition, multiple sections of the fracturing device can be arranged on the length of the whole blast hole, sealing is carried out in a sectional mode, millisecond delay blasting is achieved in the blasting holes, then multiple disturbances on the coal rock mass are achieved, the method is suitable for super-long drilling and large-size blasting construction, and rapid tunneling of the roadway can be achieved.

Description

technical field [0001] The invention belongs to the technical field of roadway excavation, and in particular relates to a hydraulic fracturing combined hydraulic blasting roadway large-scale excavation method and a fracturing device. Background technique [0002] In the process of coal mining, sometimes it is inevitable to encounter hard coal rocks. At this time, conventional mechanical coal mining cannot meet the requirements. Loosening and cracking methods must be used to reduce the strength of the top coal before mechanical mining. After searching the existing technical documents, it was found that the Chinese patent application number 201610500132.X, the name of the invention: a method for rapid excavation of tunnels by hydraulic fracturing segmental blasting, the publication number CN106150507A, the patent reads as: the patent of the present invention relates to a The method for tunneling fast in the hard rock under the mine comprises the following steps: (1) drill 5 bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21B43/26F42D1/08F42D3/04
CPCE21B43/26E21D9/006F42D1/08F42D3/04
Inventor 于建新刘焕春褚怀保张英才王金星徐平冯路郭敏陈晨
Owner HENAN POLYTECHNIC UNIV
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