CN116029159A - Rotary-cut drilling in-situ detection method for surrounding rock of underground engineering - Google Patents
Rotary-cut drilling in-situ detection method for surrounding rock of underground engineering Download PDFInfo
- Publication number
- CN116029159A CN116029159A CN202310290319.1A CN202310290319A CN116029159A CN 116029159 A CN116029159 A CN 116029159A CN 202310290319 A CN202310290319 A CN 202310290319A CN 116029159 A CN116029159 A CN 116029159A
- Authority
- CN
- China
- Prior art keywords
- drilling
- rock
- pressure
- strength
- surrounding rock
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 253
- 239000011435 rock Substances 0.000 title claims abstract description 217
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 31
- 238000001514 detection method Methods 0.000 title claims abstract description 22
- 238000012360 testing method Methods 0.000 claims abstract description 87
- 238000000034 method Methods 0.000 claims abstract description 44
- 230000009471 action Effects 0.000 claims abstract description 15
- 238000013210 evaluation model Methods 0.000 claims abstract description 12
- 230000000694 effects Effects 0.000 claims abstract description 10
- 238000005192 partition Methods 0.000 claims abstract description 9
- 238000012544 monitoring process Methods 0.000 claims description 16
- 238000012417 linear regression Methods 0.000 claims description 8
- 230000015556 catabolic process Effects 0.000 claims description 6
- 238000012669 compression test Methods 0.000 claims description 6
- 238000006731 degradation reaction Methods 0.000 claims description 6
- 238000011084 recovery Methods 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 5
- 238000006467 substitution reaction Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000011835 investigation Methods 0.000 abstract description 2
- 238000012113 quantitative test Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- -1 Substituted- Chemical class 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 101150061215 outM gene Proteins 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention provides an in-situ detection method for rotary-cut drilling of surrounding rock of underground engineering, which relates to the technical field of geotechnical engineering investigation, and comprises the following steps: obtaining drilling torque increment of rock test piece under three-way confining pressure effectM z And drilling pressure incrementF z The method comprises the steps of carrying out a first treatment on the surface of the Establishing drilling torque deltaM z And drilling pressure incrementF z And drilling depthhIs a relation of (3). Establishing a cutting energy density solution of rock under the action of three-way confining pressureξ c Simultaneously obtain the compressive strength of the rock test pieceσ c And (5) establishing a rock mass equivalent compressive strength rotary cutting drilling evaluation model. Performing in-situ test on the field surrounding rock, combining an evaluation model, and according to the rock massThe equivalent strength partitions the surrounding rock. The method establishes a rock mass equivalent compressive strength rotary-cut drilling test model considering the three-way confining pressure effect, and can realize the in-situ quantitative detection of the strength parameters of underground engineering surrounding rock.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering investigation, in particular to a rotary-cut drilling in-situ detection method for surrounding rocks of underground engineering.
Background
With the high-speed development of economy, deep underground projects such as mine tunnels, diversion tunnels and the like are advanced to deep at unprecedented speed. With the increasing of the burial depth, the surrounding rock ground stress is continuously increased. Studies have shown that rock strength increases with increasing confining pressure. Meanwhile, the rock shows different post-peak characteristics under different confining pressures, the rock which shows brittleness under lower confining pressures can be converted into ductility under high confining pressures, and dynamic disaster accidents which are generated in deep underground engineering and represented by rock burst are aggravated to a degree and are increased in frequency compared with shallow parts.
The quantitative test of the strength of the deep rock mass is the foundation of surrounding rock support design and surrounding rock dynamic disaster prevention and control. The existing rock strength testing method mainly comprises indoor compression tests, needs on-site coring, cataloging, transportation, indoor tests and other processes, has low testing efficiency, and cannot meet on-site construction progress. Meanwhile, as a main object of support, coring of broken rock is difficult, and mechanical parameters of the broken rock cannot be accurately measured. The digital drilling test technology utilizes the correlation between drilling parameters such as drilling speed, drill bit rotating speed, drilling pressure, drilling torque and the like and rock mass strength parameters, can realize the rapid acquisition of rock mass equivalent compressive strength parameters, and provides a new way for the real-time acquisition of on-site surrounding rock mechanical parameters.
The key point of the digital drilling test technology is the establishment of the relation between the parameter while drilling and the rock mass strength parameter, and the surrounding rock stress has an important influence on the friction effect between the drill bit and the rock under the condition of the original rock stress, so that an underground engineering surrounding rock rotary-cut drilling in-situ detection method considering the original rock stress is needed to be established, and the accurate and real-time acquisition of the deep rock mass strength parameter is realized.
Disclosure of Invention
The invention aims to provide a novel in-situ detection method for rotary-cut drilling of surrounding rock of underground engineering, which comprises the following steps ofThe method analyzes the drilling torque increment generated by the digital drill bit under the confining pressure by developing the rock digital drilling test under the confining pressureM z And drilling pressure incrementF z The theoretical solution of the cutting energy density of the rock test piece under the action of three-way confining pressure is obtainedξ c In combination with compressive strength of rock test piecesσ c The rock mass equivalent compressive strength rotary-cut drilling evaluation model considering the three-way confining pressure effect is established, and the in-situ quantitative test of the compressive strength of the surrounding rock of the underground engineering can be realized.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
according to one aspect of the invention, a novel method for in-situ detection of rotary-cut drilling of surrounding rock of underground engineering is provided. The rotary-cut drilling in-situ detection method for the surrounding rock of the underground engineering comprises the following steps: obtaining drilling torque increment of rock test piece under three-way confining pressure effectM z And drilling pressure incrementF z The method comprises the steps of carrying out a first treatment on the surface of the Establishing drilling torque deltaM z And drilling pressure incrementF z Respectively with drilling depthhIs a fitting relation of (2); establishing cutting energy density solution of rock test piece under three-way confining pressure effectξ c The method comprises the steps of carrying out a first treatment on the surface of the Obtaining compressive strength of rock specimenσ c The method comprises the steps of carrying out a first treatment on the surface of the According to the compressive strength of the obtained rock test pieceσ c And cutting energy density solutionξ c Establishing a rock mass equivalent compressive strength rotary cutting drilling evaluation model to obtain surrounding rock equivalent compressive strength
。
According to one embodiment of the invention, the drilling torque increment of the rock test piece under the action of the three-way confining pressure is obtainedM z And drilling pressure incrementF z Comprising the following steps: carrying out a digital drilling test on a rock test piece under the action of three-way confining pressure through a rock drilling system, and monitoring the change condition of the drilling depth of the parameter while drilling; calculating according to the drilling parameters to obtain the drilling torque increment of the rock drilling system under different drilling depths when the drill bit does not rotate in a cutting modeM z And drilling pressure incrementF z 。
According to an embodiment of the present invention, wherein the while drilling parameter comprises an initial drilling torqueM c Initial drilling pressureF c Real-time drilling torqueM h And real-time drilling pressureF h The drilling torque increment when the drill bit of the rock drilling system rotates without cutting under different drilling depths is calculated according to the drilling parametersM z And drilling pressure incrementF z Comprising the following steps: developing a rock digital drilling test, and keeping the drill bit in a non-cutting rotation state; monitoring initial drilling torque of drill bit of rock drilling system without drilling depthM c And initial drilling pressureF c The method comprises the steps of carrying out a first treatment on the surface of the Real-time drilling torque monitoring drill bit non-cutting rotation at different drilling depthsM h And real-time drilling pressureF h The method comprises the steps of carrying out a first treatment on the surface of the According to the formulaM z =M h -M c 、F z =F h -F c Calculating drilling torque increment when drill bit does not cut and rotate under different drilling depthsM z And drilling pressure incrementF z 。
According to an embodiment of the invention, the rock drilling system comprises a pilot drilling unit for drilling the rock specimen and a monitoring control unit for controlling and monitoring parameters while drilling in real time, the parameters while drilling further comprising a drilling speedVRotational speed of drill bitNDrilling torqueMAnd drilling pressureFEstablishing cutting energy density solution of rock test piece under three-way confining pressure effect
。
According to one embodiment of the invention, the compressive strength of the rock specimen is obtainedσ c And cutting energy density solutionξ c Establishing a rock mass equivalent compressive strength rotary cutting drilling evaluation model to obtain surrounding rock equivalent compressive strength
Comprising the following steps: performing linear regression analysis on the compressive strength of the rock test piece obtained by the indoor compression test and the cutting energy density of the rock test piece obtained by the digital drilling test to determine a linear regression coefficientαSum constant ofβThe method comprises the steps of carrying out a first treatment on the surface of the Will beαAndβsubstitution of the value of (2)
Calculating to obtain->
。
According to an embodiment of the invention, the method for in-situ detection of rotary-cut drilling of the surrounding rock of the underground engineering further comprises the following steps: dividing the surrounding rock strength into areas, and setting a first threshold valuea 1 A second threshold valuea 2 And (2) anda 1 ＜a 2 the method comprises the steps of carrying out a first treatment on the surface of the When (when)
When the surrounding rock strength corresponds to the depth range, the depth range is a strength degradation area; when->
When the surrounding rock strength corresponds to the depth range, the depth range is a strength recovery area; when->
When the surrounding rock strength corresponds to the depth range of the original rock strength area; and adopting corresponding supporting measures according to the surrounding rock partition characteristics.
One embodiment of the present invention has the following advantages or benefits:
according to the method, through carrying out a rock digital drilling test under the action of confining pressure, the drilling torque increment generated by the digital drill under the action of confining pressure is analyzed by considering the cutting force and friction force of the digital drillM z And drilling pressure incrementF z The cutting energy density theory of the rock test piece under the effect of the three-way confining pressure is obtained by utilizing the monitored drilling parameters such as the drilling speed, the rotating speed of the drill bit, the drilling torque, the drilling pressure and the likeSolutionξ c In combination with compressive strength of rock test piecesσ c The rock mass equivalent compressive strength rotary-cut drilling evaluation model considering the three-way confining pressure effect is established, and the in-situ quantitative test of the compressive strength of the surrounding rock of the underground engineering is realized; the rock mass equivalent compressive strength under the deep high-stress condition is obtained by directly drilling in situ, so that the problem that the conventional test method cannot test the rock mass strength under the original rock stress condition and partition the surrounding rock strength is solved.
Drawings
The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 is a schematic diagram illustrating a method of rotary-cut drilling in-situ detection of a surrounding rock of an underground works according to an exemplary embodiment.
FIG. 2 is a schematic diagram illustrating a method of in situ detection of rotary-cut drilling of a subterranean engineered surrounding rock in terms of surrounding rock equivalent strength zones, according to an exemplary embodiment.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted.
The terms "a," "an," "the," and "said" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. in addition to the listed elements/components/etc.
As shown in fig. 1 to 2, fig. 1 shows a schematic diagram of a rotary-cut drilling in-situ detection method for surrounding rock of an underground engineering. Fig. 2 shows a schematic diagram of surrounding rock equivalent strength partition of the method for in-situ detection of rotary-cut drilling of surrounding rock of underground engineering.
The embodiment of the invention discloses an in-situ detection method for rotary-cut drilling of surrounding rock of underground engineering, which comprises the following steps: obtaining drilling torque increment of rock test piece under three-way confining pressure effectM z And drilling pressure incrementF z The method comprises the steps of carrying out a first treatment on the surface of the Establishing drilling torque deltaM z And drilling pressure incrementF z Respectively with drilling depthhIs a fitting relation of (2); establishing cutting energy density solution of rock test piece under three-way confining pressure effectξ c The method comprises the steps of carrying out a first treatment on the surface of the Obtaining compressive strength of rock specimenσ c The method comprises the steps of carrying out a first treatment on the surface of the According to the compressive strength of the obtained rock test pieceσ c And cutting energy density solutionξ c Establishing a rock mass equivalent compressive strength rotary cutting drilling evaluation model to obtain surrounding rock equivalent compressive strength
。
As shown in fig. 1, a rock mass drilling system is utilized to carry out a digital drilling test on a rock test piece under the action of three-way confining pressure, the change condition of the drilling depth along with drilling parameters is monitored, and the drilling torque increment when the drill bit does not rotate without cutting under different drilling depths is obtained through calculationM z And drilling pressure incrementF z Establishing drilling torque incrementM z And drilling depthhIs used to simultaneously establish drilling pressure incrementF z And drilling depthhAnd/or fitting curve, thereby being capable of establishing a cutting energy density solution of the rock test piece under the action of three-way confining pressureξ c Carrying out an indoor compression test again, sampling a rock block on site to manufacture a plurality of rock test pieces, wherein artificial cracks are not allowed to appear in the process, the specification of the rock test pieces usually adopts a standard cylinder with the diameter of 50mm and the height of 100mm (height-diameter ratio of 2), wherein the deviation of the parallelism of two end faces of the rock test pieces is not more than 0.1mm, the deviation of the diameters of two end faces of the rock test pieces is not more than 0.2mm, the two end faces are perpendicular to the axis of the rock test pieces, placing the rock test pieces in the center of a bearing plate of a press machine, adjusting the bearing plate to enable the rock test pieces to be uniformly stressed, and starting the press machine to obtain the productLoading the rock test piece at a loading speed of 0.5 to 0.8MPa/s until the rock test piece is damaged, and recording the damage load in the processPAnd a corruption type description, according to the formula
Calculating compressive strength of rock specimenσ c WhereinAIs the cross-sectional area of the rock test piece, and finally according to the obtained compressive strength of the rock test pieceσ c And cutting energy density solutionξ c Then a rock mass equivalent compressive strength rotary cutting drilling evaluation model can be established, so as to obtain the surrounding rock equivalent compressive strength +.>
The method can realize in-situ quantitative test of the compressive strength of the surrounding rock of the underground engineering, and is used for evaluating the strength partition of the surrounding rock at the position, thereby adopting a corresponding supporting mode.
In a preferred embodiment of the invention, the drilling torque increment of the rock test piece under the action of the three-way confining pressure is obtainedM z And drilling pressure incrementF z Comprising the following steps: carrying out a digital drilling test on a rock test piece under the action of three-way confining pressure through a rock drilling system, and monitoring the change condition of the drilling depth of the parameter while drilling; calculating according to the drilling parameters to obtain the drilling torque increment of the rock drilling system under different drilling depths when the drill bit does not rotate in a cutting modeM z And drilling pressure incrementF z 。
As shown in FIG. 1, a rock test piece is placed into a rock drilling system, three-way confining pressure is applied to the rock test piece, a drilling test is carried out on the rock test piece through a guiding drilling unit of the rock drilling system, in the drilling process, the drilling speed, the drilling rotating speed and other drilling parameters of a drill bit are controlled and monitored through a monitoring control unit of the rock drilling system, so that the change condition of the drilling depth of the drilling parameters can be known, and the drilling torque increment of the drill bit under different drilling depths in no-cutting rotation can be carried outM z And drilling pressure incrementF z Is calculated by the computer.
In a preferred embodiment of the present invention,the while-drilling parameters include initial drilling torqueM c Initial drilling pressureF c Real-time drilling torqueM h And real-time drilling pressureF h Calculating according to the drilling parameters to obtain the drilling torque increment when the drill bit of the rock drilling system rotates without cutting under different drilling depthsM z And drilling pressure incrementF z Comprising the following steps: developing a rock digital drilling test, and keeping the drill bit in a non-cutting rotation state; monitoring initial drilling torque of drill bit of rock drilling system without drilling depthM c And initial drilling pressureF c The method comprises the steps of carrying out a first treatment on the surface of the Real-time drilling torque monitoring drill bit non-cutting rotation at different drilling depthsM h And real-time drilling pressureF h The method comprises the steps of carrying out a first treatment on the surface of the According to the formulaM z =M h -M c 、F z =F h -F c Calculating drilling torque increment when drill bit does not cut and rotate under different drilling depthsM z And drilling pressure incrementF z 。
As shown in FIG. 1, in the digital drilling test, first, when the drill bit is not drilling a rock test piece and is in an idle state, the initial drilling torque of the drill bit is recordedM c And initial drilling pressureF c Real-time drilling torque at different depths of non-cutting rotation after drilling of rock test piece by drill bitM h And real-time drilling pressureF h For example real-time drilling torque of the drill bit at depths of 10mm, 20mm, 30mm … …M h And real-time drilling pressureF h By means ofM z =M h -M c 、F z =F h -F c The drilling torque increment of the drill bit without cutting rotation at the depths of 10mm, 20mm and 30mm … … can be calculatedM z And drilling pressure incrementF z 。
In a preferred embodiment of the invention, the rock drilling system comprises a pilot drilling unit for drilling a rock specimen and a monitoring control unit forReal-time control and monitoring of while-drilling parameters, including drilling speedVRotational speed of drill bitNDrilling torqueMAnd drilling pressureFEstablishing cutting energy density solution of rock test piece under three-way confining pressure effect
。
Wherein by adjusting the drilling speedVRotational speed of drill bitNDrilling torqueMAnd drilling pressureFAnalyzing the data of the constant while-drilling coefficients to obtain a cutting energy density solution of the rock test piece
。
In a preferred embodiment of the invention, the cutting energy density of the rock specimen is solved as
Wherein, the liquid crystal display device comprises a liquid crystal display device,mfor the number of rows of cutting edges,Vin order for the rate of penetration to be high,Nfor the rotational speed of the drill bit,Min order to achieve the drilling torque,Fin order to drill the pressure in the well,M z in order to increase the drilling torque,F z in order to increase the drilling pressure,δin order to achieve a friction angle, the friction angle is,f(l)as a function of the cutting edge(s),Ris the radius of the drill bit.
Wherein the number of rows of cutting edgesmAlso influencing the cutting energy density solution of rock test piecesξ c ，m=2 ormAt=3, the cutting energy density solution of the rock specimenξ c All different. Study of cutting energy Density solution of column number of cutting edge to rock test pieceξ c According to the drilling parameters, the number of cutting edge rows and the cutting energy density of the rock test pieceξ c Is obtained by linear relation of (2)mThe cutting energy density solution formula at=3 is as follows:
wherein the cutting edge function
。
In a preferred embodiment of the invention, a cutting energy density solution of the rock test piece under the action of the three-way confining pressure is established according to a fitting relationξ c Comprising the following steps: according to the fitting relation and the energy conservation principle, an energy analysis model formula is established:W M +W F =E C +E F ……（1）；W M for drilling torqueMThe energy generated is calculated by the following formula:
… … (2), wherein,Nfor the rotational speed of the drill bit,Min order to achieve the drilling torque,M z in order to increase the drilling torque,tis the drilling time;W F for drilling pressureFThe energy generated and its calculation formula is: />
… … (3), wherein,Fin order to drill the pressure in the well,F z in order to increase the drilling pressure,Vin order for the rate of penetration to be high,tis the drilling time;E F to take into account frictionfThe energy required for cutting the rock test piece is calculated as follows: />
… … (4), where n is the number of cutting edges of the drill,Nfor the rotational speed of the drill bit,m i for each row of cutting edges subjected to frictionfThe moment on the center of the drill bit,tis the drilling time; taking equations (2), (3) and (4) into (1) to calculate the energy taken to cut the rock test pieceE C 。
Wherein, substituting formulas (2), (3) and (4) into (1) yields:
thereby obtaining
……（5）。
In a preferred embodiment of the present invention,E F the energy required for cutting the rock test piece is calculated as:
… … (4) comprises: according to->
WhereinL i I=1, 2,3 … … n,K i positive pressure applied to each row of cutting edges, and
，μfor the friction coefficient of the drill bit and the hole bottom, calculating to obtainm i The method comprises the steps of carrying out a first treatment on the surface of the Will bem i And carrying out formula (4) to obtainE F 。
Wherein the method comprises the steps of
Substituted->
Obtaining
Substituting (5) or substituting formulas (4) and (1) to obtain +.>
Wherein, the method comprises the steps of, wherein,μfor the coefficient of friction of the drill bit and the bottom of the hole, when the drill bit is made of a diamond compact,μ=0.21，L i for positive pressure experienced by each row of cutting edges,m i for each row of cutting edges subjected to frictionfThe moment on the center of the drill bit,E F to take into account frictionfThe energy required to cut the rock specimen.
In a preferred embodiment of the invention, the number n of cutting edges is 3,
at the time, calculate +.>
The method comprises the steps of carrying out a first treatment on the surface of the To be obtainedE F 、W F AndW M substituting formula (1) and calculating to obtain +.>
The method comprises the steps of carrying out a first treatment on the surface of the Calculation of cutting energy Density solution for rock test pieces
。
Wherein the number n of cutting edges is preferably 3 in this embodiment, so that column i=1
Column i=2 +.>
Column i=3 +.>
Substituting formula (4) to calculate +.>
Will beE F Substitution into equation (5) yieldsE C Whereas the cutting energy density of the rock test piece is solvedξ c Meaning the energy required by the drill bit to cut a rock specimen of unit volume, so that the cutting energy density solution of the rock specimen can be calculatedξ c 。
In a preferred embodiment of the invention, the compressive strength of the rock specimen is determined based on the obtained compressive strengthσ c And cutting energy density solutionξ c Establishing a rock mass equivalent compressive strength rotary cutting drilling evaluation model to obtain surrounding rock equivalent compressive strength
Comprising the following steps: compressive strength of rock specimen obtained by indoor compression testσ c And obtained by digital drilling testsCutting energy density solution for rock test pieceξ c Performing linear regression analysis to determine linear regression coefficientsαSum constant ofβThe method comprises the steps of carrying out a first treatment on the surface of the Will beαAndβsubstitution of the value of (2)
Calculated to obtain
Wherein, the compressive strength of the rock test piece obtained by the indoor compression test and the rock cutting energy density obtained by the digital drilling test are decompressedξ c Linear regression analysis based on rock cutting energy densityξ c And compressive strength of rockσ c In rock formξ c For x-axis, rockσ c For y-axis, drawξ c Andσ c a scatter plot, a linear relationship between the two is found to be significant,σ c overall, it appears as followsξ c Increasing trend, so that the linear regression coefficient can be determinedαSum constant ofβThereby (a)
In a preferred embodiment of the invention, the method for in-situ detection of rotary-cut drilling of the surrounding rock of the underground engineering further comprises the following steps: dividing the surrounding rock strength into areas, and setting a first threshold valuea 1 A second threshold valuea 2 And (2) anda 1 ＜a 2 the method comprises the steps of carrying out a first treatment on the surface of the When (when)
When the surrounding rock strength corresponds to the depth range, the depth range is a strength degradation area; when->
When the surrounding rock strength corresponds to the depth range, the depth range is a strength recovery area; when->
When the surrounding rock strength corresponds to the depth range of the original rock strength area; and adopting corresponding supporting measures according to the characteristics of the zonal surrounding rock.
As shown in fig. 2, in-situ digital drilling tests of surrounding rocks are carried out on different positions of the surrounding rocks with the same section on site, so that equivalent compression strength while-drilling depth curves of the rock mass in different directions are obtained. Sequentially connecting the positions with similar intensities on the curves to form a surrounding rock equivalent compressive strength partition map, and setting a first threshold valuea 1 A second threshold valuea 2 Dividing the surrounding rock into an intensity degradation zone, an intensity recovery zone and a raw rock intensity zone in sequence, wherein the value range of the intensity degradation zone is smaller thana 1 The value range of the intensity recovery area isa 1 To the point ofa 2 The value range of the original rock strength area is larger thana 2 Therefore, which of the strength degradation area, the strength recovery area or the original rock strength area the surrounding rock areas with different depths of the roadway belong to can be determined, and corresponding supporting measures can be adopted aiming at the surrounding rock partition characteristics.
According to the method, through carrying out a rock digital drilling test under the action of confining pressure, the drilling torque increment generated by the digital drill under the action of confining pressure is analyzed by considering the cutting force and friction force of the digital drillM z And drilling pressure incrementF z The cutting energy density theoretical solution of the rock test piece under the effect of the three-way confining pressure is obtained by utilizing the monitored drilling parameters such as drilling speed, drill bit rotating speed, drilling torque, drilling pressure and the likeξ c In combination with compressive strength of rock test piecesσ c The rock mass equivalent compressive strength rotary-cut drilling evaluation model considering the three-way confining pressure effect is established, and the in-situ quantitative test of the compressive strength of the surrounding rock of the underground engineering is realized; the rock mass equivalent compressive strength under the deep high stress condition is obtained by directly drilling in situ, so that the problem that the conventional test method cannot test the rock mass strength under the original rock stress condition and partition the surrounding rock strength is solved; the method for testing and partitioning the mechanical parameters of the deep surrounding rock while drilling is provided, so that the in-situ real-time testing of the surrounding rock of the deep roadway can be realized.
In embodiments of the present invention, the term "plurality" refers to two or more, unless explicitly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly attached, detachably attached, or integrally attached. The specific meaning of the above terms in the embodiments of the present invention will be understood by those of ordinary skill in the art according to specific circumstances.
In the description of the embodiments of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present invention and to simplify the description, and do not indicate or imply that the devices or units referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the embodiments of the present invention.
In the description of the present specification, the terms "one embodiment," "a preferred embodiment," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention and is not intended to limit the embodiment of the present invention, and various modifications and variations can be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.
Claims (6)
1. The rotary-cut drilling in-situ detection method for the surrounding rock of the underground engineering is characterized by comprising the following steps of:
obtaining drilling torque increment of rock test piece under three-way confining pressure effectM z And drilling pressure incrementF z ；
Establishing drilling torque deltaM z And drilling pressure incrementF z Respectively with drilling depthhIs a fitting relation of (2);
establishing cutting energy density solution of rock test piece under three-way confining pressure effectξ c ；
Obtaining compressive strength of rock specimenσ c The method comprises the steps of carrying out a first treatment on the surface of the And
according to the compressive strength of the obtained rock test pieceσ c And cutting energy density solutionξ c Establishing a rock mass equivalent compressive strength rotary cutting drilling evaluation model to obtain surrounding rock equivalent compressive strength
。
2. The method for in-situ detection of rotary-cut drilling of underground engineering surrounding rock according to claim 1, wherein the method is characterized in that the drilling torque increment of the rock test piece under the action of three-way surrounding pressure is obtainedM z And drilling pressure incrementF z Comprising the following steps:
carrying out a digital drilling test on a rock test piece under the action of three-way confining pressure through a rock drilling system, and monitoring the change condition of the drilling depth of the parameter while drilling;
calculating according to the drilling parameters to obtain the drilling torque increment of the rock drilling system under different drilling depths when the drill bit does not rotate in a cutting modeM z And drilling pressure incrementF z 。
3. The method for in-situ detection of rotary-cut drilling of underground engineering surrounding rock according to claim 2, wherein the while-drilling parameters comprise initial drilling torqueM c Initial drilling pressureF c Real-time drilling torqueM h And real-time drilling pressureF h The drilling torque increment when the drill bit of the rock drilling system rotates without cutting under different drilling depths is calculated according to the drilling parametersM z And drilling pressure increaseMeasuring amountF z Comprising the following steps:
developing a rock digital drilling test, and keeping the drill bit in a non-cutting rotation state;
monitoring initial drilling torque of drill bit of rock drilling system without drilling depthM c And initial drilling pressureF c ；
Real-time drilling torque monitoring drill bit non-cutting rotation at different drilling depthsM h And real-time drilling pressureF h The method comprises the steps of carrying out a first treatment on the surface of the And
according to the formulaM z =M h -M c 、F z =F h -F c Calculating drilling torque increment when drill bit does not cut and rotate under different drilling depthsM z And drilling pressure incrementF z 。
4. A method of in situ detection of rotary-cut drilling of a surrounding rock for underground works as claimed in claim 3, wherein the rock drilling system comprises a pilot drilling unit for drilling the rock test piece and a monitoring control unit for controlling and monitoring parameters while drilling in real time, the parameters while drilling further comprising a drilling speedVRotational speed of drill bitNDrilling torqueMAnd drilling pressureFEstablishing cutting energy density solution of rock test piece under three-way confining pressure effect
。
5. The method for in-situ detection of rotary-cut drilling of surrounding rock for underground engineering according to claim 1, wherein the compressive strength of the rock test piece is obtainedσ c And cutting energy density solutionξ c Establishing a rock mass equivalent compressive strength rotary cutting drilling evaluation model to obtain surrounding rock equivalent compressive strength
Comprising the following steps:
compression strength of rock obtained by indoor compression testσ c And cutting energy density solution of rock obtained by digital drilling testξ c Performing linear regression analysis to determine linear regression coefficientsαSum constant ofβ；
Will beαAndβsubstitution of the value of (2)
Calculating to obtain->
。
6. The method for in situ detection of rotary-cut drilling of underground engineering surrounding rock according to claim 5, further comprising:
dividing the surrounding rock strength into areas, and setting a first threshold valuea 1 A second threshold valuea 2 And (2) anda 1 ＜a 2 ；
when (when)
When the surrounding rock strength corresponds to the depth range, the depth range is a strength degradation area; />
When (when)
When the surrounding rock strength corresponds to the depth range, the depth range is a strength recovery area;
when (when)
When the surrounding rock strength corresponds to the depth range of the original rock strength area;
and adopting corresponding supporting measures according to the surrounding rock partition characteristics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310290319.1A CN116029159A (en) | 2023-03-23 | 2023-03-23 | Rotary-cut drilling in-situ detection method for surrounding rock of underground engineering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310290319.1A CN116029159A (en) | 2023-03-23 | 2023-03-23 | Rotary-cut drilling in-situ detection method for surrounding rock of underground engineering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116029159A true CN116029159A (en) | 2023-04-28 |
Family
ID=86079698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310290319.1A Pending CN116029159A (en) | 2023-03-23 | 2023-03-23 | Rotary-cut drilling in-situ detection method for surrounding rock of underground engineering |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116029159A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116415376A (en) * | 2023-06-08 | 2023-07-11 | 中国矿业大学(北京) | Rock energy while-drilling in-situ determination and control design method |
| CN116595809A (en) * | 2023-07-18 | 2023-08-15 | 中国矿业大学(北京) | Underground engineering surrounding rock drilling pressure relief-detection evaluation method |
| CN117236197A (en) * | 2023-11-10 | 2023-12-15 | 中国矿业大学(北京) | Rock mass elastic modulus while drilling test method and system |
| CN117288587A (en) * | 2023-11-24 | 2023-12-26 | 中国矿业大学(北京) | Rock tensile strength while drilling test method and system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108663269A (en) * | 2018-03-30 | 2018-10-16 | 山东大学 | Underground engineering wall rock digital rig partition method based on equivalent rock mass strength |
| US20200386659A1 (en) * | 2016-07-06 | 2020-12-10 | Shandong University | Multifunctional true triaxial rock drilling test system and method |
| CN114839024A (en) * | 2022-07-04 | 2022-08-02 | 中国矿业大学(北京) | Method for testing and evaluating characteristics of fractured rock mass while drilling |
-
2023
- 2023-03-23 CN CN202310290319.1A patent/CN116029159A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20200386659A1 (en) * | 2016-07-06 | 2020-12-10 | Shandong University | Multifunctional true triaxial rock drilling test system and method |
| CN108663269A (en) * | 2018-03-30 | 2018-10-16 | 山东大学 | Underground engineering wall rock digital rig partition method based on equivalent rock mass strength |
| CN114839024A (en) * | 2022-07-04 | 2022-08-02 | 中国矿业大学(北京) | Method for testing and evaluating characteristics of fractured rock mass while drilling |
Non-Patent Citations (4)
| Title |
|---|
| QI WANG 等: ""Upper bound analytic mechanics model for rock cutting and its application in field testing"", 《TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY INCORPORATING TRENCHLESS TECHNOLOGY RESEARCH》 * |
| 王琦 等: ""基于数字钻探和支持向量机预测岩体单轴抗压强度的方法"", 《岩土力学》 * |
| 王琦 等: ""数字钻探随钻参数与岩石单轴抗压强度关系"", 《煤炭学报》 * |
| 赵强: ""基于水平定向钻技术的隧道围岩强度与岩性反演研究"", 《中国博士学位论文全文数据库 工程科技Ⅱ辑》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116415376A (en) * | 2023-06-08 | 2023-07-11 | 中国矿业大学(北京) | Rock energy while-drilling in-situ determination and control design method |
| CN116415376B (en) * | 2023-06-08 | 2023-08-29 | 中国矿业大学(北京) | Rock energy while-drilling in-situ determination and control design method |
| CN116595809A (en) * | 2023-07-18 | 2023-08-15 | 中国矿业大学(北京) | Underground engineering surrounding rock drilling pressure relief-detection evaluation method |
| CN116595809B (en) * | 2023-07-18 | 2023-10-03 | 中国矿业大学(北京) | Underground engineering surrounding rock drilling pressure relief-detection evaluation method |
| CN117236197A (en) * | 2023-11-10 | 2023-12-15 | 中国矿业大学(北京) | Rock mass elastic modulus while drilling test method and system |
| CN117236197B (en) * | 2023-11-10 | 2024-02-20 | 中国矿业大学(北京) | Rock mass elastic modulus while drilling test method and system |
| CN117288587A (en) * | 2023-11-24 | 2023-12-26 | 中国矿业大学(北京) | Rock tensile strength while drilling test method and system |
| CN117288587B (en) * | 2023-11-24 | 2024-02-20 | 中国矿业大学(北京) | Rock tensile strength while drilling test method and system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN116029159A (en) | Rotary-cut drilling in-situ detection method for surrounding rock of underground engineering | |
| Wang et al. | In-situ test and bolt-grouting design evaluation method of underground engineering based on digital drilling | |
| CN108663269B (en) | Underground engineering surrounding rock digital drilling zoning method based on equivalent rock mass strength | |
| Zhao et al. | Effects of jointed rock mass and mixed ground conditions on the cutting efficiency and cutter wear of tunnel boring machine | |
| Zhang et al. | Study of rock-cutting process by disc cutters in mixed ground based on three-dimensional particle flow model | |
| WO2018006585A1 (en) | Multi-functional true triaxial rock drilling test system and method | |
| Rajesh Kumar et al. | Prediction of uniaxial compressive strength, tensile strength and porosity of sedimentary rocks using sound level produced during rotary drilling | |
| Yin et al. | Study on the influence of joint spacing on rock fragmentation under TBM cutter by linear cutting test | |
| Pan et al. | Full-scale rotary cutting test to study the influence of disc cutter installment radius on rock cutting forces | |
| CN110486007B (en) | In-situ testing device and method for mechanical parameters of coal mine surrounding rock while drilling | |
| Gong et al. | Development of a mechanical rock breakage experimental platform | |
| CN114839024B (en) | Method for testing and evaluating characteristics of fractured rock mass while drilling | |
| CN113418795B (en) | Drilling test system and method for predicting uniaxial compressive strength of coal rock mass | |
| Shirani Faradonbeh et al. | Failure behaviour of a sandstone subjected to the systematic cyclic loading: insights from the double-criteria damage-controlled test method | |
| CN110261234B (en) | Fractured rock mass separation layer anchoring control simulation test device and method | |
| CN111209684B (en) | Advanced forecasting method for rock strength parameters based on while-drilling monitoring technology | |
| Wang et al. | Study of the dynamic fracturing process and stress shadowing effect in granite sample with two holes based on SCDA fracturing method | |
| Peng et al. | Study on the influence of different control modes on TBM disc cutter performance by rotary cutting tests | |
| Zhang et al. | Investigation on the relationship among the Cerchar abrasivity index, drilling parameters and physical and mechanical properties of the rock | |
| Wang et al. | Research on an evaluation method for the strength of broken coal mass reinforced by cement slurry based on digital drilling test technology | |
| Wang et al. | Influence of time-lagged unloading paths on fracture behaviors of marble using energy analysis and post-test CT visualization | |
| Jiang et al. | Drilling-based measuring method for the c-φ parameter of rock and its field application | |
| Tang et al. | Shield tunneling in rock–soil interface composite formations | |
| CN116595809B (en) | Underground engineering surrounding rock drilling pressure relief-detection evaluation method | |
| Alber et al. | Investigation of a limestone pillar failure part 1: geology, laboratory testing and numerical modeling |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20230428 |
|
| RJ01 | Rejection of invention patent application after publication |