CN109828314B - Precision detection method for plastic damage range of mining roadway surrounding rock - Google Patents
Precision detection method for plastic damage range of mining roadway surrounding rock Download PDFInfo
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- CN109828314B CN109828314B CN201910105519.9A CN201910105519A CN109828314B CN 109828314 B CN109828314 B CN 109828314B CN 201910105519 A CN201910105519 A CN 201910105519A CN 109828314 B CN109828314 B CN 109828314B
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Abstract
The invention discloses a mining roadway surrounding rock damage range precise detection method which is characterized in that after roadway driving is influenced and before mining is influenced, drilling rock cores around the roadway surrounding rock are obtained, and meanwhile, the deepest position of a macroscopic crack of the roadway surrounding rock is preliminarily observed by using drilling imaging equipment. And (3) taking a rock core except the deepest macroscopic fracture, dividing the rock core into equal-length rock blocks by adopting a finite element idea, and scanning all the rock blocks by utilizing nuclear magnetic resonance equipment. After the core position is mined, extracting the rock core again at the same sampling place position, observing the position of the macroscopic fracture, taking the rock core except the deepest macroscopic fracture, dividing the rock core into rock blocks with the length equal to that of the first measured rock core, scanning the porosity of the rock blocks with the same lithology and depth by using the nuclear magnetic resonance equipment again, comparing the rock blocks with the pre-mining test piece, searching the same position with the same lithology and depth and the same porosity, and determining the maximum damage depth of the plastic zone of the roadway with repeated mining.
Description
Technical Field
The invention relates to the field of mining roadway surrounding rock control, in particular to a mining roadway surrounding rock damage range precise detection method.
Background
The deformation and damage of the surrounding rock of the roadway are major problems which restrict the safe and efficient mining of the mine, and the analysis from the aspect of mechanical mechanism shows that the deformation and damage of the surrounding rock of the roadway are caused by the damage of different ranges and forms of the surrounding rock, and the morphological characteristics and the damage range of the damage have direct influence on the damage type and the intensity of the surrounding rock of the roadway. Therefore, the method has important theoretical significance and practical value for controlling the surrounding rocks of the roadway and preventing and controlling disasters by precisely detecting the plastic damage range of the surrounding rocks of the roadway. The process of stress failure of the rock is the process of initiation, expansion and fracture of internal micro-fracture, and the analysis is far from enough by using the traditional mechanical means, so that the nuclear magnetic resonance scanning rock porosity technology is introduced for research. The porosity is the ratio of the sum of all pore space volumes in a rock sample to the volume of the rock sample, and a large number of laboratory researches show that the fitting function of the porosity and the axial pressure ratio of the rock shows that the porosity increases exponentially with the increase of the axial pressure under the uniaxial compression and triaxial compression states of the rock. Therefore, the tunnel surrounding rock damage state and the damage range are judged by a method for testing the porosity through a nuclear magnetic resonance experiment means under the mining influence and the real triaxial compression effect of the rock, and the method has real and measurable practical significance.
Disclosure of Invention
Therefore, the invention provides a method for precisely detecting the surrounding rock damage range of the mining roadway, which can realize more precise detection of the surrounding rock damage condition of the mining roadway.
The invention provides a method for precisely detecting the plastic damage range of mining roadway surrounding rock, which comprises the following steps:
acquiring drill core around the surrounding rock of the roadway before mining influence after the roadway driving influence;
preliminarily observing the macroscopic fracture position of the surrounding rock of the roadway by using drilling imaging equipment;
taking a rock core except the deepest macroscopic fracture, dividing the rock core into equal-length rock blocks by adopting a finite element thought, scanning all the rock blocks by utilizing nuclear magnetic resonance equipment to obtain T of each rock block2Spectrum and porosity, and generating a spectrum of the drill hole core along with the depth of the surrounding rock;
after the coring position is mined, extracting the rock core again at the same sampling position and observing the position of the macroscopic crack;
get the bestDividing the rock core except the macroscopic crack of the depth into rock blocks with the same length as the first measured rock core, and performing porosity scanning on the rock blocks with the same lithology and depth by using the nuclear magnetic resonance equipment again to obtain T of each rock block2And spectrum and porosity, generating a spectrum of the drill hole core along with the depth of the surrounding rock, comparing the spectrum with the test piece before mining, and searching the position with the same lithology, the same depth and the same porosity to determine the maximum damage depth of the plastic zone of the repeated mining roadway.
Further, the depth of the roadway drilling hole is 4m-10 m.
Furthermore, the depth of the roadway drilling is 6m-10m of a top plate, and the depth of the bottom plate and the side wall is 4m-6 m.
Furthermore, the depth of the roadway drilling is 8m of a top plate, 5m of a bottom plate and an upper.
Furthermore, the number of the tunnel drill holes arranged at the top and the bottom of the section before coring mining is more than 2, and the number of the tunnel drill holes arranged at two sides of the section is more than 1.
Furthermore, the number of the tunnel drill holes arranged at the top and the bottom of the section after coring mining is more than 3, and the number of the tunnel drill holes arranged at two sides of the section is more than 2.
The invention has the beneficial effects that:
1. the method utilizes a roadway surrounding rock damage-based precise detection method, can accurately detect the depth of the roadway surrounding rock damage position, and has more accurate information.
2. The method of the invention fully considers the mining influence and the surrounding rock three-axis loading state of the roadway, thereby determining the surrounding rock damage range of the roadway, accurately mastering the surrounding rock damage state of the roadway and having very important guiding significance for determining the design scheme of on-site support.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic diagram of a method for precisely detecting the plastic damage range of surrounding rock of a mining roadway according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
FIG. 1 is a flow diagram of a precision detection method for a mining roadway surrounding rock plastic failure range, in which after roadway driving is affected and before mining is affected, drill hole cores around the roadway surrounding rock are obtained, and simultaneously, a drilling imaging device is used for preliminarily observing the deepest position of a macroscopic crack of the roadway surrounding rock. Taking a rock core except the deepest macroscopic crack, dividing the rock core into equal-length rock blocks by adopting a finite element thought, scanning all the rock blocks by utilizing nuclear magnetic resonance equipment to obtain T of each rock block2And spectrum and porosity, and generating a spectrum of the drill hole core along with the depth of the surrounding rock. After the coring position is mined, extracting the rock core again at the same sampling position, observing the position of the macroscopic fracture, taking the rock core except the deepest macroscopic fracture, dividing the rock core into rock blocks with the same length as the first-time measured rock core, and scanning the porosity of the rock blocks with the same lithology and depth by using the nuclear magnetic resonance equipment again to obtain the T value of each rock block2And spectrum and porosity, generating a spectrum of the drill hole core along with the depth of the surrounding rock, comparing the spectrum with the test piece before mining, and searching the position with the same lithology, the same depth and the same porosity to determine the maximum damage depth of the plastic zone of the repeated mining roadway.
As a better choice of the method, the depth of the roadway drilling is 4-10 m. Preferably, the depth of the tunnel drilling is 6-10 m for the top plate, and 4-6 m for the bottom plate and the upper plate. As a further alternative to the above method, the depth of the roadway bore is preferably 8 metres in the roof and 5 metres in the floor and upper.
The method comprises the following steps of obtaining drill core around the surrounding rock of the roadway before mining influence after the roadway driving influence:
1) arranging a plurality of tunnel drill holes in a tunnel to extract a core, and arranging at least 2 tunnel drill holes on the top, the bottom and two sides of a section respectively, wherein the depth of a rock sample is 4-10m, and the diameter of a cable rock sample is more than 50 mm;
2) arranging a drilling imaging instrument in the roadway drilling hole;
3) and collecting and recording the corresponding crack distribution condition of the surrounding rock in the drill hole collected by the drilling imaging instrument, and determining the damage depth and the damage range of the surrounding rock of the roadway according to the cracks.
Taking a rock core except the deepest macroscopic crack, dividing the rock core into equal-length rock blocks by adopting a finite element idea, scanning the porosity of all the rock blocks by utilizing nuclear magnetic resonance equipment, and well preparing the position, the porosity and the T of each rock block2And (5) recording spectrum data.
1) The rock sample is processed into rock mechanical standard test pieces through a laboratory, the diameter is phi 50mm, and the height is 100 mm. And marking the intercepted test piece according to the test piece marking method with the taken depth and according with the rock mechanics standard.
2) And putting the marked test piece into a vacuum pressurizing saturation device, pressurizing and saturating for 24h, taking out, and soaking in water for 24 h.
3) Wiping off surface water of the water-saturated test piece, completely wrapping the test piece by using a preservative film, putting the test piece into a nuclear magnetic resonance instrument, scanning the porosity of the test piece, and making a record.
As a better choice of the method, after the core taking position is mined, the core is extracted again at the same sampling place position, and the macroscopic fracture position is observed, as a better choice of the method, the number of the roadway drill holes arranged at the top and the bottom of the section is more than 3, and the number of the roadway drill holes arranged at the two sides of the section is more than 2.
And after the coring position is mined, extracting the rock core again at the same sampling position, and observing the position of the macroscopic fracture.
1) Re-coring, namely respectively arranging at least 2 roadway drill holes on the top, the bottom and two sides of the section at the same section at the position before mining, wherein the depth of a rock sample is 4-10m, and the diameter of a cable rock sample is more than 50 mm;
2) arranging a drilling imaging instrument in the roadway drilling hole;
3) and collecting and recording the corresponding crack distribution condition of the surrounding rock in the drill hole collected by the drilling imaging instrument, and determining the damage depth and the damage range of the surrounding rock of the roadway according to the cracks.
Equally dividing the obtained coring into equal-length rock blocks, scanning the porosity of all the rock blocks by using nuclear magnetic resonance equipment, and making the position, porosity and T of each rock block2And (5) recording spectrum data.
Carrying out porosity and T on the mining front test piece and the mining rear test piece with the same depth2And (4) spectrum comparison, and searching the position with the same lithology and the same porosity, so as to be used as the mining damage boundary range of the surrounding rock of the roadway.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (6)
1. A precision detection method for the plastic damage range of mining roadway surrounding rock is characterized by comprising the following steps:
acquiring drill core around the surrounding rock of the roadway before mining influence after the roadway driving influence;
preliminarily observing the macroscopic fracture position of the surrounding rock of the roadway by using drilling imaging equipment;
taking a rock core except the deepest macroscopic fracture, dividing the rock core into equal-length rock blocks by adopting a finite element thought, scanning all the rock blocks by utilizing nuclear magnetic resonance equipment to obtain T of each rock block2Spectrum and porosity, and generating a spectrum of the drill hole core along with the depth of the surrounding rock;
after the coring position is mined, extracting the rock core again at the same sampling position and observing the position of the macroscopic crack;
taking a rock core except the deepest macroscopic crack, dividing the rock core into rock blocks with the same length as the first measured rock core, and performing porosity scanning on the rock blocks with the same lithology and depth by using nuclear magnetic resonance equipment again to obtain T of each rock block2Spectrum and porosity, formation of drilled core-following wall rockA map of depth; carrying out porosity and T on the mining front test piece and the mining rear test piece with the same depth2And (4) spectrum comparison, and searching the position with the same lithology and the same porosity, so as to be used as the mining damage boundary range of the surrounding rock of the roadway.
2. The method for precisely detecting the plastic failure range of the surrounding rock of the mining roadway as claimed in claim 1, wherein the depth of the drilled hole of the roadway is 4m-10 m.
3. The method for precisely detecting the plastic damage range of the surrounding rock of the mining roadway as claimed in claim 2, wherein the depth of the roadway drilling is 6m-10m for a top plate and 4m-6m for a bottom plate and a side wall.
4. The method for precisely detecting the plastic damage range of the surrounding rock of the mining roadway as claimed in claim 3, wherein the depth of the roadway drilling is 8m for a top plate and 5m for a bottom plate and a side wall.
5. The method for precisely detecting the plastic failure range of the surrounding rock of the mining roadway as claimed in claim 1, wherein the number of roadway drill holes arranged at the top and bottom of the cross section before coring mining is more than 2, and the number of roadway drill holes arranged at two sides of the cross section is more than 1.
6. The method for precisely detecting the plastic failure range of the surrounding rock of the mining roadway as claimed in claim 5, wherein the number of roadway drill holes arranged at the top and bottom of the cross section after core mining is more than 3, and the number of roadway drill holes arranged at two sides of the cross section is more than 2.
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