Tunnel hard rock non-blasting excavation method

A non-blasting, hard rock technology, applied in the direction of tunnels, earthwork drilling, mining equipment, etc., can solve the problems that the construction efficiency is greatly affected, the number of drilling holes is large, and the construction efficiency is affected, achieving significant technical advantages and overcoming the blasting effect , High excavation efficiency

Inactive Publication Date: 2021-11-02

WUHAN UNIV

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AI-Extracted Technical Summary

Problems solved by technology

This method is the first time to use the method of drilling splitting to excavate the tunnel rock mass, but the number of drill holes required to manufacture the free surface is large, which affects the construction efficiency

[0006] The patent number is "CN 104314574 A" "a hard rock non-blasting excavation block method m...

Abstract

The invention provides a tunnel hard rock non-blasting excavation method. The tunnel hard rock non-blasting excavation method can realize efficient excavation of complete or relatively complete hard rock without adopting large excavation equipment such as a heading machine and the like , and is characterized by comprising the following steps of 1, drilling contour holes along a tunnel face contour line so as to determine a tunnel excavation range, and determining each drilling and grooving position according to the excavation range, then, forming and drilling a plurality of cavity expanding holes in the position close to the positions; 2, drilling a plurality of rows of guide holes between the contour holes and the cavity expanding holes; 3, drilling groove forming holes which are meshed and overlapped with each other at the determined drilling and grooving positions, and finally forming a groove cavity; 4, enabling the cavity expanding holes near the groove cavity to be subjected to impact crushing, and therefore expanding excavation is conducted on the groove cavity; 5, according to a certain excavation sequence, starting from the guide holes close to the expanded and excavated groove cavity, adopting a hydraulic breaking hammer for conducting impact breaking on the guide holes, so that excavation of the rock mass of a main body part is completed; and 6, conducting impact crushing on the contour holes.

Application Domain

Tunnels

Technology Topic

Drill holeEnvironmental geology +3

Image

Examples

Experimental program(1)

Example Embodiment

[0024] A specific embodiment of the tunnel hard rock non-burst excavation method according to the present invention will be described in detail below with reference to the accompanying drawings.

[0025] like figure 1 As shown, the hard rock section of a project tunnel is 3.9m, the height is 3.9m, and the section is 13.58m. 2 Construction using the technical solution of the present invention, the specific steps are as follows:

[0026] (1) In the palm shedral line 2 and the tunnel axis, the outer interpolation angle is formed, and the contour hole 3 is formed, thereby determining the range of tunnel excavation, in the present embodiment, the contour hole 3 pore size is 76mm, the borehole spacing is 0.5m, and the drilling is 4m.

[0027] (2) According to the range of excavation, choose figure 1 The position of the last row is the position of the drilling into the tank, and the expansion hole 6 is drilled near the position. In the present embodiment, the expansion hole 6 has a hole diameter of 76 mm, the borehole spacing is 0.4m, and the drilling is effective Take 4m.

[0028] (3) The position of the drilled hole in the palm is used to a slot hole 4 using a large diameter drill and a supporting rig, adjacent drills, the adjacent drilling, the overlap, and finally form a groove cavity 5 of the length. In the present embodiment, the hole diameter of the groove 4 is 115 mm, and the borehole spacing is 90 mm, the drilling is 4m, and the luminated 5 width ( figure 1 The horizontal direction is 1.285m.

[0029] (3) In the palm of the palm, the pitch is provided with a diamond hole 8, in the present embodiment, the pore 8 is 76 mm in the present embodiment, and the borehole spacing is 0.8m, and the drilling is 4m.

[0030] (4) The expansion hole 6 is hit by the hydraulic bore 6 in accordance with the hydraulic crushing hammer, and the groove cavity is excavated. figure 1 After the retrodical lumen 7 shown in the dashed rectangle frame, the retrofolded lumen 7 width is 1.676m, and the length ( figure 1 The middle vertical direction) is 0.896m, the expansion of the expansion needs to consider the size of the hydraulic crushing hammer, and continue to perform the next impact and breakage for each expansion of each expansion.

[0031] (5) According to a certain order, from the guide hole 8 adjacent to the retrofit, the impact is broken, and the excavation of the main body partial rock mass is completed, in the present embodiment, selected approach The guiding hole 8 of the retail surface begins to impact, and the subsequent guiding hole 8 impacts and forms a new dazzling surface, ensuring that there is a near access to each guiding hole 8, and the guiding hole impacts broken The size of the hydraulic crush hammer is required to consider the size of the hydraulic crushing hammer, and the next impact breakage is continued after each guide hole 8 needs to excavate enough space.

[0032] (6) The contour hole 3 is impulted, in the present embodiment, the contoured hole 3 cannot form a complete crack portion of the entire crack is treated with a mechanical impact crushing.

[0033] In the present embodiment, the rock mass is excavated by the damage resistance of the rock-resistant strength and shear strength than the compressive strength and the drilling impact, and in the case of a conventional surface. For step (4), steps (5) and step (6), drilling the broken feeding, such as figure 2As shown, the restriction of the hydraulic crushing hammer is required to impact the guide pore hole in the order of 9, 10, 11, 12.

[0034] The above embodiments are merely illustrative of the technical solutions of the present invention.The tunnel hard rock non-burst excavation method according to the present invention is not limited to the contents described in the above embodiments, but is defined by the claims.Any modified or supplemental or equivalent replacement of the present invention, in the art of this embodiment, is within the scope of the claims of the invention.

PUM

Property	Measurement	Unit
Depth	1.0 ~ 5.0	m
Diameter	2.0 ~ 76.0	mm

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