CN-121976818-A - Digging and chiseling method for underground large-section geological drilling chamber

CN121976818ACN 121976818 ACN121976818 ACN 121976818ACN-121976818-A

Abstract

The invention discloses a tunneling and chiseling method for a large-section geological drilling chamber in a well, which comprises the steps of (1) determining the size of the geological chamber and the length of a connecting channel, (2) firstly determining the construction position of the geological chamber, vertically tunneling the connecting channel to the center of the chamber in a tunnel closest to the chamber until the dimension of the plane of the chamber is met, conducting top-up blasting according to the dimension of the chamber to form a bottom chamber, controlling the height to be 5m, (4) tunneling measures at the tunnel setting position to connect a ramp, controlling the gradient, designing the position to be communicated with the top of the chamber at a position with a designated height from the floor, (5) tunneling the top chamber according to a three-star arch technical standard after tunneling the top of the chamber is finished, forming the outline dimension of the top chamber, controlling the height of the top of the chamber to be 5m as well, and (6) conducting reinforced supporting on the top 5m chamber by adopting a spray anchor net, controlling the thickness of the spray anchor, and ensuring personnel equipment safety during drilling.

Inventors

CHEN LIDE
REN GUOFANG
Pu Wanfeng

Assignees

酒泉钢铁(集团)有限责任公司

Dates

Publication Date: 20260505
Application Date: 20260305

Claims (1)

1. A method of drilling a large section geological drilling chamber downhole, comprising the steps of: (1) Determining the size of a geological chamber and the length of a communication channel; (2) Determining the construction position of the geological chamber, vertically tunneling a connecting channel to the center of the chamber in a tunnel nearest to the chamber, and performing expansion brushing according to the specification and the size of the chamber until the plane size of the chamber is met; (3) Then carrying out ram blasting upwards according to the size of the chamber to form a bottom chamber, wherein the height is controlled to be one third of the total height of the chamber; (4) The tunneling measure is communicated with the slope ramp at the tunnel setting position, the gradient is controlled, and the tunnel is designed to be communicated with the top of the chamber at a position with a designated height from the floor; (5) After tunneling to the top of the chamber, excavating a top chamber according to the three-star arch technical standard to form the outline size of the top chamber, wherein the height of the top of the chamber is controlled to be one third of the total height of the chamber; (6) The top chamber is reinforced and supported by adopting an anchor spraying net, the anchor spraying thickness is controlled, and the safety of personnel and equipment during drilling is ensured; (7) After the bottom third and the top third of the chamber are tunneled according to the size, the middle remaining third of the chamber is solid, and the middle remaining third of the solid rock mass is subjected to differential blasting to form a final chamber outline by one-time well forming, and the peripheral holes adopt a smooth blasting technology with multiple holes and less charge; (8) The slag stones are not cleaned after the middle third entity is blasted, anchor spraying net support is carried out on the rock walls of the middle third entity in a slag climbing mode, the rock walls of the middle third entity are connected with the top support to form a whole, and the residual slag stones are cleaned after the support is finished; (9) Finally, the bottom one third chamber is supported by an anchor spraying net and is tightly connected with a supporting net of the middle wall to form a whole, so that the supporting strength is improved; (10) And finally, cleaning the residue at the bottom of the chamber, leveling the floor, and performing spin hardening by cement to finally form the geological drilling working chamber.

Description

Digging and chiseling method for underground large-section geological drilling chamber Technical Field The invention belongs to the technical field of mine chamber excavation, and particularly relates to an excavation method for a large-section geological drilling chamber in a well. Background The invention mainly solves the problems that in geological investigation of underground mines, because the drilling frame is too high when ultra-deep geological drilling (> 2000 m) is drilled, a geological chamber with a large section size needs to be excavated and drilled to effectively place the drilling frame, but the construction difficulty is high when the underground chamber with a large section is excavated and drilled, and great safety risk exists. In the mineral resource exploration process, geological drilling is required to be constructed, and the physical and chemical information and the mineral composition of the mineral are collected through analysis and assay of drill cores, so that the mineral type, composition, grade, physical and chemical information and the like of an exploration area are determined, drilling work is usually carried out on the ground surface, and the method is convenient and quick and simple to operate. However, when the earth surface does not have drilling conditions or when the old mine is exploited to a deep part and deep supplementary exploration is needed for the old mine, the geological chamber needs to be drilled in the underground, the deeper the drilling hole is, the larger the size of the chamber is required, when the drilling hole depth exceeds 2000m, the height of the drill frame generally exceeds 14m, and therefore, the size of the chamber of the drill frame is required to reach 10 x 9x 15 (length x width x height) at the minimum. When the underground chamber height exceeds 15m, the traditional slag climbing operation is generally adopted according to the current mine tunneling technology level, the shallow stripping mode is adopted to gradually improve the underground chamber height, but when tunneling is carried out to a certain height, the safety channel is blocked by rock slag and has great safety risk, the artificial courtyard is constructed in a manual courtyard digging and chiseling mode, the artificial courtyard is directly dug and chiseled to the height of 15m, the whole chamber contour is gradually formed, and then the manual courtyard is manually dug and chiseled and expanded downwards layer by layer in a manual mode, so that the mode is labor-saving, low in efficiency, high in safety risk and high in construction difficulty. Therefore, when the deep drilling chamber is constructed underground, the construction difficulty is high, and the two methods are difficult to use and have great safety risks. The invention adopts a layered construction technology, solves the technical problems of the traditional chamber digging and chiseling mode, has small construction difficulty, simple operation and high safety, and better solves the technical problems in the traditional geological chamber construction. Disclosure of Invention The invention provides a underground large-section geological drilling chamber, which solves the technical problems of the traditional chamber digging and chiseling mode, has the advantages of low construction difficulty, simple operation and high safety, and better solves the technical problems in the traditional geological chamber construction. Therefore, the invention adopts the following technical scheme: a method of drilling a large section geological drilling chamber downhole, comprising the steps of: (1) Determining the size of a geological chamber and the length of a communication channel; (2) Determining the construction position of the geological chamber, vertically tunneling a connecting channel to the center of the chamber in a tunnel nearest to the chamber, and performing expansion brushing according to the specification and the size of the chamber until the plane size of the chamber is met; (3) Then carrying out ram blasting upwards according to the size of the chamber to form a bottom chamber, wherein the height is controlled to be one third of the total height of the chamber; (4) The tunneling measure is communicated with the slope ramp at the tunnel setting position, the gradient is controlled, and the tunnel is designed to be communicated with the top of the chamber at a position with a designated height from the floor; (5) After tunneling to the top of the chamber, excavating a top chamber according to the three-star arch technical standard to form the outline size of the top chamber, wherein the height of the top of the chamber is controlled to be one third of the total height of the chamber; (6) The top chamber is reinforced and supported by adopting an anchor spraying net, the anchor spraying thickness is controlled, and the safety of personnel and equipment during drilling is ensured; (7) After the bottom third and the