Method for enabling fully mechanized face to directly pass through collapse pillar by drilling weakened rock

A fully-mechanized mining face and collapse column technology, which is applied in earthwork drilling, ground mining, underground mining, etc., can solve the problems of poor economic practicability, complicated process, long time period, etc., achieve less coal loss, ensure normal advancement, The effect of reducing skipping

Inactive Publication Date: 2012-10-31
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0005] The invention provides a method for drilling to weaken the rock so that the fully mechanized mining face directly passes through the collapsed column, so as to solve the problems in the prior art that the fully mechanized mining face passes through the collapsed column with complicated process, poor economical practicability and long time period

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  • Method for enabling fully mechanized face to directly pass through collapse pillar by drilling weakened rock
  • Method for enabling fully mechanized face to directly pass through collapse pillar by drilling weakened rock
  • Method for enabling fully mechanized face to directly pass through collapse pillar by drilling weakened rock

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Embodiment approach 1

[0029] Implementation of a kind of drilling weakening rock provided by the present invention makes the fully mechanized mining face directly pass the method for the collapse column, and its described method is carried out according to the following steps:

[0030] Step 1, such as figure 2 and image 3 As mentioned above, the geophysical prospecting method is used to measure the geological conditions in front of the fully-mechanized mining face of a certain mine by using a proton precession magnetometer. During the measurement process, the probe is perpendicular to the direction of the geomagnetic field. It has been determined that the shape of the collapse column 4 is approximately elliptical, with a major axis of 116m and a short axis of 77m, and the distance between the collapse column 4 and the return air trough 3 is 26.5m.

[0031] Step 2: Drilling and sampling the collapsed column rock, making the rock sample into a standard test piece, and measuring the uniaxial compre...

Embodiment approach 2

[0036] Step 1. Reference Figure 4 and Figure 5 , through the drilling method, it is determined that the shape of the collapse column 4 is approximately elliptical, its major axis is 96m, and its short axis is 67m.

[0037] Step 2: Drilling and sampling the collapsed pillar rock, making the rock sample into a standard test piece, and measuring the uniaxial compressive strength of the rock on an electro-hydraulic servo universal testing machine is 23.7MPa.

[0038] Step 3: Drill out the borehole according to the installation requirements of the borehole stress gauge, and send the pressure pillow into the hole according to the predetermined direction. Fill oil into the pressure pillow to make it expand, and when it reaches and stabilizes at the set pressure value, close the oil injection valve and observe. The peak abutment pressure of the fully mechanized mining face is determined to be 52.9MPa; the range of abutment pressure affected by mining is 0m~70m, and the abutment pr...

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Abstract

The invention provides a method for enabling a fully mechanized face to directly pass through a collapse pillar by a drilling weakened rock. The method comprises the following steps of: determining a boundary of the collapse pillar and sampling a collapse pillar rock; detecting a single-shaft compression strength of the rock and detecting the supporting pressure level of the fully mechanized face and an influence range thereof; determining a drilling parameter of the collapse pillar according to the single-shaft compression strength of the collapse pillar rock, the supporting pressure level in front of the fully mechanized face and the influence range thereof; and then determining a reasonable cutting depth when a coal cutter passes through the collapse pillar. According to a mechanical property of the collapse pillar rock, the rock is drilled and the mechanical strength of the collapse pillar rock is reduced, so that the fully mechanized face can directly pass through the collapse pillar rock and the problems that a roadway construction and timbering engineering amount, a coal loss amount and a moving working amount are great when the fully mechanized face jumps over, winds around and directly passes through the collapse pillar can be solved; and the method is economical and practical, simple and rapid, safe and reliable.

Description

technical field [0001] The invention relates to a method for a fully mechanized mining face to directly pass through a collapsed column, in particular to a technical proposal for weakening rocks so that a fully mechanized mining face directly passes through a collapsed column. Background technique [0002] The limestone layer in the lower part of the coal-measure strata is dissolved by groundwater to form karst caves. Under the long-term action of the gravity of the overlying strata and the geological tectonic force, the karst caves collapse, and the overlying strata become unstable and collapse, forming collapsed columns, also known as carbon-free columns. Collapse column is a kind of geological disaster body, which is widely distributed in the Carboniferous Permian coal measure strata in North my country. It destroys the continuity of coal seams and seriously affects the normal production of coal mines. Compared with coal, the rock in the collapsed column has the character...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/16
Inventor 康天合赵国飞郭俊庆王成帅
Owner TAIYUAN UNIV OF TECH
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