Search

CN-121977400-A - Segmented plugging blasting method for downlink drilling

CN121977400ACN 121977400 ACN121977400 ACN 121977400ACN-121977400-A

Abstract

The invention provides a sectional blocking blasting method for a downlink drilling hole, which comprises the steps of carrying out blasting engineering design according to engineering geological conditions and blasting effect requirements, selecting a charging structure with matched specifications according to drilling parameters, sequentially placing the charging structure filled with explosive into the drilling hole from the bottom of the drilling hole according to design intervals, introducing filling materials into the drilling hole, uniformly filling the filling materials in the circumferential direction of the charging structure, blocking holes, completing final connection of a detonation network in a safe area outside the drilling hole after all drilling holes are charged, and exciting the network by a detonation station instruction after comprehensive inspection and warning are set so as to realize detonation. The sectional plugging blasting method for the downlink drilling optimizes the axial distribution of blasting energy, effectively enhances the energy effect of an orifice area and reduces the large block rate.

Inventors

  • Ao Liangkai
  • WU YONGZHENG
  • LI JUNCHEN
  • HE SIFENG
  • ZHANG HENG
  • Zu Guoli

Assignees

  • 中煤科工开采研究院有限公司

Dates

Publication Date
20260505
Application Date
20260213

Claims (10)

  1. 1. A segmented plug blasting method for down-hole drilling, comprising: according to engineering geological conditions and blasting effect requirements, blasting engineering design is carried out, and drilling parameters, detonation time sequence and blocking requirements are determined; according to drilling parameters, selecting a charging structure with matched specifications, wherein the charging structure comprises an expansion section and a contraction connecting section, the expansion section is connected with the contraction connecting section, the expansion section is used for loading explosive, the contraction connecting section is used for loading a lead wire connected with the explosive, the expansion section and the contraction connecting section are multiple, and the expansion section and the contraction connecting section are sequentially and alternately arranged in the extending direction of the drilling; Sequentially placing the explosive loading structures filled with the explosives into the drill holes from the bottom of the holes according to the designed interval; Filling a space between the charging structure and the borehole wall with a flowable granular inert filling material, and completely filling the filling material in an annular space around the charging structure; Plugging the orifice; after all the drilling charges are filled, the final connection of the detonation network is completed in a safe area outside the hole; after comprehensive inspection and warning, the network is excited by the command of the detonation station to realize detonation.
  2. 2. The segmented plug blasting method for down-hole drilling of claim 1, wherein the radial dimension of the enlarged segment is greater than the radial dimension of the constricted connecting segment and less than the radial dimension of the borehole.
  3. 3. The segmented plug blasting method for down-hole drilling of claim 2, wherein selecting a specification-matched charge structure comprises the steps of: According to the radial uncoupling coefficient I.e. , wherein, For the diameter of the borehole, And calculating the charging diameter for the charging diameter, wherein the inner diameter of the expansion section is larger than or equal to the charging diameter.
  4. 4. A segmented plug blasting method for down-hole drilling according to claim 3, wherein in the direction of extension of the drill hole, both ends of the charge structure are provided as enlarged segments.
  5. 5. The segmented plug blasting method for down-hole drilling of claim 4, further comprising the steps of: according to the axial decoupling coefficient I.e. , wherein, To sum the length of the charge in the borehole, The length of the expansion section and the length of the contraction connection section satisfy the relation of the sum of the lengths between two adjacent explosive loading points , wherein, In order to expand the length of the segment, To shrink the length of the connecting section, and 。
  6. 6. The segmented plug blasting method for down-hole drilling of claim 5, wherein the enlarged segment is detachably connected to the contracted connecting segment.
  7. 7. The segmented plugging blasting method for down-hole drilling according to claim 5, wherein the expansion segment comprises a first connecting segment, an extension segment and a second connecting segment connected in sequence, the first connecting segment and the second connecting segment are respectively connected with the shrinkage connecting segment, and at least one of the first connecting segment and the second connecting segment is detachably connected with the extension segment.
  8. 8. The segmented plug blasting method for down-hole drilling according to claim 1, wherein the filler material is quartz sand, and a distance from the filler material to an orifice of the hole drilling is smaller than a distance from the charging structure to the orifice of the hole drilling in a length direction of the hole drilling.
  9. 9. The segmented plug blasting method for down-hole drilling according to claim 1, wherein in plugging the hole, comprising the steps of: And plugging the hole opening of the drill hole by adopting a blasting plugging material, wherein the length of the blasting plugging material is less than one third of the length of the drill hole in the length direction of the drill hole.
  10. 10. The segmented plug blasting method for down-hole drilling of claim 9, further comprising the steps of: the blasting plugging material is layered and filled for multiple times, and tamping is carried out after each filling so as to ensure that the blasting plugging material and the hole wall are tightly adhered.

Description

Segmented plugging blasting method for downlink drilling Technical Field The invention belongs to the technical field of rock blasting engineering, and particularly relates to a segmented blocking blasting method for downlink drilling. Background In deep hole step blasting operations in the fields of surface mining, tunneling, hydraulic engineering and the like, downward vertical drilling or inclined drilling is a main drilling mode. The advantages and disadvantages of the blasting effect directly determine the production efficiency, the cost and the operation safety, wherein the charging and plugging technology of the blast hole is particularly critical. In the related art, to prevent "punch" accidents and flying rock hazards, the design criteria of "the plugging length must be greater than or equal to the minimum resistance line" (typically 20-30 times the pore size) are generally followed. The extra-long inert plugging section which is forced to be reserved for safety cannot be directly acted by explosive explosion stress waves in the orifice area, and the rock cannot be broken only by residual energy, which is a root cause of high orifice blocking rate of an open pit mine, so that the industry is faced with the technical dilemma of 'unsafe shortening plugging and much lengthened plugging' for a long time. Disclosure of Invention The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the invention provides a segmented plugging blasting method for down-hole drilling, which allows the final plugging length of an orifice to be greatly shortened to a critical impact-resistant safe length, so that explosive energy can directly act on the difficult-to-burst rock mass of the orifice, and the generation area of large blocks of the orifice is eliminated from the root. The embodiment of the invention discloses a segmented plugging blasting method for downlink drilling, which comprises the following steps: according to engineering geological conditions and blasting effect requirements, blasting engineering design is carried out, and drilling parameters, detonation time sequence and blocking requirements are determined; according to drilling parameters, selecting a charging structure with matched specifications, wherein the charging structure comprises an expansion section and a contraction connecting section, the expansion section is connected with the contraction connecting section, the expansion section is used for loading explosive, the contraction connecting section is used for loading a lead wire connected with the explosive, the expansion section and the contraction connecting section are multiple, and the expansion section and the contraction connecting section are sequentially and alternately arranged in the extending direction of the drilling; Sequentially placing the explosive loading structures filled with the explosives into the drill holes from the bottom of the holes according to the designed interval; Filling a space between the charging structure and the wall of the drilling hole with a granular inert filling material with fluidity, and uniformly filling the filling material in an annular space around the charging structure; Plugging the orifice; after all the drilling charges are filled, the final connection of the detonation network is completed in a safe area outside the hole; after comprehensive inspection and warning, the network is excited by the command of the detonation station to realize detonation. According to the sectional plugging blasting method for the downlink drilling, disclosed by the embodiment of the invention, a step structure formed by an expanding section and a contracting connecting section in a charging structure is utilized to push a filling material (such as quartz sand) to generate a multi-stage high-pressure self-locking sand plug on the hole wall. This "step-wise" mechanism allows the detonation gas to have its pressure peaks cut down by the internal multiple sand plugs layer by layer before reaching the orifice. Therefore, the invention breaks through the limit of the traditional plugging length, allows the final plugging length of the orifice to be greatly shortened to the critical impact-stopping safety length, enables the explosive energy to directly act on the orifice hard-to-burst rock mass, and radically eliminates the orifice massive generation area. In some embodiments, the radial dimension of the enlarged section is greater than the radial dimension of the contracted connecting section and less than the radial dimension of the bore. In some embodiments, selecting a specification-matched charge configuration includes the steps of: According to the radial uncoupling coefficient I.e., wherein,For the diameter of the borehole,And calculating the charging diameter for the charging diameter, wherein the inner diameter of the expansion section is larger than or equal to the charging d