Device and method for extracting rock core by drilling fractured rock mass

Abstract

The invention discloses a device and method for extracting a rock core by drilling fractured rock mass, and belongs to the field of geotechnical engineering. The device comprises a driving device, a drill bit and a paraffin injection system, wherein the driving device is used for providing power for driving the drill bit, the drill bit comprises a cutting barrel and a paraffin screening barrel, the paraffin screening barrel is rotationally connected into the cutting barrel, a paraffin supply gap is formed between the cutting barrel and the paraffin screening barrel, the cutting barrel is fixedly connected to the power output end of the driving device, the paraffin injection system comprises a paraffin liquid distribution channel and a supply device, one end of the paraffin liquid distribution channel communicates with the supply device, the other end communicates with the paraffin supply gap, the paraffin sieve barrel is of a sieve-shaped structure, and the supply device is used for supplying liquid paraffin injected into the sampling rock core. According to the device and method for extracting the rock core by drilling the fractured rock mass, in-situ sampling can be carried out on the fractured rock mass, the integrity of the drilled rock core can be kept more completely, the success rate and the operation efficiency of core drilling operation on the fractured rock mass are improved, and the condition of carrying out a rock mechanics experiment on a later-stage fractured rock sample can be better met.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, and in particular relates to a device and method for drilling broken rock mass to extract cores. Background technique [0002] With the increasing mining depth of mines, tunnels and underground chambers at home and abroad, accompanied by complex geological conditions, engineering problems such as breakage and collapse of the surrounding rock of the roadway and the roof of the stope will occur, which will have a great impact on site construction and safety. Therefore, it is necessary to study the mechanism of weak rock mass and fractured zone rock mass. In order to study the weak and broken rock mass, it is necessary to carry out coring operations on the field rock mass first. Only complete cores can ensure the smooth progress of the experiment. For this reason, a device for extracting cores from broken rock masses is needed. [0003] In the prior art, the devices for extracting rock cores...

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Problems solved by technology

[0003] In the prior art, the devices for extracting rock cores are basically drilling rigs with single-layer diamond bits, which can drill cores on complete and hard rock masses, but the drilling rigs have a single function and cannot solve the overall coring operation of broken rock masses. It meets the requirements of in-situ sampling and cannot guarantee the integrity of the core of the broken rock mass. At the same time, the success rate and operation efficiency of core drilling operations are very low

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