CN116415376B - Rock energy while-drilling in-situ determination and control design method - Google Patents
Rock energy while-drilling in-situ determination and control design method Download PDFInfo
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- CN116415376B CN116415376B CN202310671771.2A CN202310671771A CN116415376B CN 116415376 B CN116415376 B CN 116415376B CN 202310671771 A CN202310671771 A CN 202310671771A CN 116415376 B CN116415376 B CN 116415376B
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- 239000011435 rock Substances 0.000 title claims abstract description 282
- 238000005553 drilling Methods 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000013461 design Methods 0.000 title claims abstract description 31
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 29
- 238000012360 testing method Methods 0.000 claims abstract description 43
- 238000005520 cutting process Methods 0.000 claims abstract description 37
- 238000012625 in-situ measurement Methods 0.000 claims abstract description 15
- 230000006835 compression Effects 0.000 claims abstract description 11
- 238000007906 compression Methods 0.000 claims abstract description 11
- 238000005265 energy consumption Methods 0.000 claims abstract description 6
- 230000003189 isokinetic effect Effects 0.000 claims abstract description 6
- 238000004146 energy storage Methods 0.000 claims description 14
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims 1
- 230000002194 synthesizing effect Effects 0.000 abstract description 3
- 238000011835 investigation Methods 0.000 abstract description 2
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000010252 digital analysis Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/02—Reliability analysis or reliability optimisation; Failure analysis, e.g. worst case scenario performance, failure mode and effects analysis [FMEA]
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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- 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 relates to the technical field of geotechnical engineering investigation, in particular to a method for in-situ measurement and control design of rock energy while drilling, which comprises the steps of carrying out rotary cutting energy consumption analysis on a rock by developing a rock drilling test, synthesizing drilling speed V, bit rotating speed N, drilling torque M and drilling pressure F of the rock while drilling parameters, and establishing a rock cutting energy density calculation formula based on the while drilling parameters; developing a rock uniaxial compression loading and unloading test, obtaining rock elastic energy density by integrating a rock loading and unloading curve, and establishing a rock mass isokinetic energy density while drilling test model; performing in-situ drilling test of the rock mass on site, determining the equivalent energy density of the rock mass on site, establishing the site rock mass original energy grading index, and realizing the site rock mass original energy grading; selecting a reasonable on-site surrounding rock support design scheme according to an on-site rock mass unit energy grading result; the invention can test the rock mass energy and realize in-situ grading of the energy of the surrounding rock on site.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering investigation, in particular to a method for in-situ measurement and control design of rock energy while drilling.
Background
Currently, the energy demand is gradually increased, and the mining and roadway excavation are gradually shifted to the deep part. The deep rock mass increases along with the embedded depth, and high stress and large amount of energy are accumulated in the rock mass under the influence of gravity, geological structures and the like.
Along with the influence of construction and excavation disturbance of underground engineering, original energy balance in the deep rock mass is destroyed, energy accumulated in the rock mass is released, so that an original supporting system is unstably destroyed, and disaster accidents such as surrounding rock large deformation and roof collapse are caused. Therefore, the method is very important for rapidly and accurately acquiring the energy in the in-situ rock mass in the site, is a precondition for the design of an underground engineering supporting scheme, and has important significance for the stability analysis of surrounding rocks of the underground engineering.
Disclosure of Invention
The invention aims to provide a rock energy while-drilling in-situ measurement and control design method, which can be used for testing rock energy, realizing in-situ classification of on-site surrounding rock energy and providing basis for surrounding rock support design. In order to achieve the above object, the present invention solves the following problems by the following technical scheme:
the invention provides a rock mass energy while drilling in-situ measurement and control design method, which comprises the following steps:
carrying out rotary cutting energy consumption analysis on a rock body by developing a rock body drilling test, and establishing a rock body cutting energy density calculation formula based on the while-drilling parameters by integrating the drilling speed V, the bit rotating speed N, the drilling torque M and the drilling pressure F of the rock body;
developing a rock uniaxial compression loading and unloading test, obtaining rock elastic energy density by integrating a rock loading and unloading curve, and establishing a rock mass isokinetic energy density while drilling test model;
performing in-situ drilling test of the rock mass on site, determining the equivalent energy density of the rock mass on site, establishing the site rock mass original energy grading index, and realizing the site rock mass original energy grading;
and selecting a reasonable on-site surrounding rock support design scheme according to the on-site rock mass original energy grading result.
As a further technical scheme, during the rock mass cutting process, the torque increment delta M is generated during the drilling process under the influence of the friction between the drill rod and the wall of the drill hole, and the actual torque is M-delta M.
As a further technical scheme, a rock uniaxial compression loading and unloading test is carried out, a first loading intensity is set, then the rock is unloaded, the compression intensity is unloaded to the set intensity, the rock is loaded again until the rock is destroyed, at the moment, the rock destruction peak intensity is obtained, a stress strain curve in the rock loading process is drawn, and the rock elastic energy density is calculated by integrating a graph enclosed by the unloading curve and the peak intensity in the rock loading and unloading curve.
As a further technical scheme, a rock mass isokinetic energy density while drilling test model is established by carrying out regression fitting analysis on the rock mass cutting energy density and the rock elastic energy density.
As a further technical scheme, an in-situ rock mass drilling test is carried out by using the intelligent rotary cutting test system of the rock mass, and the while-drilling parameters and the cutting energy density of the rock mass of the in-situ rock mass are obtained to obtain the equivalent energy density of the rock mass of the in-situ rock mass.
As a further technical scheme, the surrounding rock energy in the supporting direction range of the underground engineering is determined according to the rock mass equivalent energy density and the surrounding rock volume in the underground engineering.
As a further technical solution, the storable amount of rock energy in the required support range is determined from the site rock mass site energy, and the rock mass is energy graded.
As a further technical solution, the division of the rock mass into three energy levels comprises:
if the energy of surrounding rock in the supporting direction range of the underground engineering is larger than or equal to a first threshold value and smaller than a second threshold value, determining that the energy storable amount of the drilling rock is a low energy storage rock;
if the energy of surrounding rock in the supporting direction range of the underground engineering is larger than or equal to the second threshold value and smaller than a third threshold value, determining that the energy storable quantity of the drilling rock is a medium energy storage rock;
and if the energy of surrounding rock in the underground engineering supporting direction range is larger than or equal to the third threshold value and smaller than or equal to the fourth threshold value, determining that the energy storable quantity of the drilling rock is a high energy storage rock.
As a further technical scheme, gradient grading of the on-site rock energy is realized according to the storable energy of the drilling rock mass, and further the internal energy of the on-site in-situ rock mass is measured.
As a further technical scheme, supporting design is carried out on surrounding rocks in the supporting direction range of underground engineering by a rock mass energy grading result, an on-site rock energy supporting design evaluation method is determined, and energy absorption of supporting members is determined.
The beneficial effects of the invention are as follows:
(1) According to the invention, through developing a rock drilling test, rotary cutting energy consumption analysis is carried out on the rock, the while-drilling parameters of the rock are synthesized, and a rock cutting energy density formula based on the while-drilling parameters is established. And (3) carrying out a rock uniaxial compression loading and unloading test, integrating a rock loading and unloading curve to obtain rock elastic energy density, and establishing a quantitative relation between rock mass cutting energy density and rock elastic energy density to obtain a rock mass equivalent energy density calculation formula.
(2) In the process of rotary cutting of rock, as the depth of drilling is deepened, the drill bit generates friction along the tangential direction of the drill bit side wall in the opposite direction of rotation due to the influence of vertical pressure generated by the inner wall of the drilling on the drill bit side wall, the friction causes torque increment delta M of the rock mass in the drilling process, and the actual torque value is M-delta M, so that the precision is improved.
(3) The invention can rapidly and accurately acquire the energy in the in-situ rock mass, and utilizes the intelligent rotary cutting testing system of the rock mass to carry out in-situ drilling test of the in-situ rock mass, acquire the equivalent energy density of the in-situ rock mass and determine the energy of surrounding rock in the supporting direction range of underground engineering.
(4) The invention realizes the on-site rock mass original energy grading by establishing the on-site rock mass original energy grading index, provides a basis for the design of surrounding rock support, reduces the occurrence of disaster accidents such as large deformation of surrounding rock, roof collapse and the like, and has important significance for the stability analysis of underground engineering surrounding rock.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. It should also be understood that the drawings are for simplicity and clarity and have not necessarily been drawn to scale. The invention will now be described and explained with additional specificity and detail through the use of the accompanying drawings in which:
FIG. 1 shows a flow chart of a method of in situ measurement while drilling and control design of rock energy in an embodiment of the invention;
FIG. 2 shows a graph of rock elastic energy density uniaxial compression single load and unload in an embodiment of the invention;
figure 3 illustrates in situ drilling test and support patterns for a rock mass in an underground works site in an embodiment of the invention.
In the figure: 1. the intelligent rotary cutting testing system for the rock mass; 2. a support member; 3. and a protective net.
Detailed Description
The technical solutions in the exemplary embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in fig. 1, the present embodiment provides a method for in-situ measurement while drilling and control design of rock energy, comprising the following steps:
s101: by developing a rock drilling test, performing rotary cutting energy consumption analysis on the rock mass, synthesizing a rock mass while drilling parameter V, N, M, F, and establishing a rock mass cutting energy density calculation formula e based on the while drilling parameter v The following are provided:
e v =g(V，N，M，F)
where ev is the rock mass cutting energy density, V is the drilling rate, N is the bit rotational speed, M is the drilling torque, and F is the drilling pressure.
Rock energy while-drilling in-situ determination and control design method is used for establishing a rock mass cutting energy density calculation formula e based on while-drilling parameters by analyzing rock mass energy conversion of rotary cutting drilling and synthesizing while-drilling parameters V, N, M, F in the rock mass drilling process v The method is characterized in that the energy required by breaking a unit rock mass in the cutting process of the rock mass is calculated according to the following formula:
wherein e v For the cutting energy density of the rock mass, V is the drilling speed, N is the drill bit rotating speed, M is the drilling torque, delta M is the torque increment and mu 1 The friction factor between the digital analysis drill bit and the rock to be cut, F is the drilling pressure, R is the digital analysis drill bitRadius, L i The length of the i-th row of cutting edges of the digital resolving drill (i=1, 2, 3, …, n).
In the process of rotary rock cutting by the drill bit, along with deepening of drilling depth, due to the influence of vertical pressure generated by the inner wall of the drill hole on the side wall of the drill bit, friction is generated by the drill bit along the tangential direction of the side wall of the drill bit in the opposite direction of rotation, and the torque increment delta M is generated by the rock mass in the drilling process due to friction, so that the actual torque value is M-delta M, and the delta M has the following calculation formula:
wherein mu 2 The friction coefficient of the drill rod and the wall of the borehole is the length of the drill rod in the borehole in the drilling process.
S102: setting the first loading strength n sigma by utilizing an indoor rock uniaxial compressor to conduct rock uniaxial compression loading and unloading test c (n is more than 0 and less than or equal to 1), unloading the rock, and unloading the compressive strength to isigma c (0 < i < 1), the rock is again loaded until destroyed, at which point the rock destruction peak strength is sigma c The stress-strain curve during rock loading is plotted as shown in FIG. 2 by loading and unloading curves and peak strength sigma in the loading and unloading curves of the rock c Integrating the enclosed graph to calculate the rock elastic energy density rho u The following are provided:
wherein ρ is u For rock elastic energy density epsilon 1 The strain corresponding to the peak strength when the rock is broken; f (x) is the stress-strain function in the loading and unloading curve of the rock.
S103: by cutting energy density e of rock mass v Elastic energy density ρ with rock u Regression fitting analysis is carried out, and a rock mass isokinetic energy density while drilling test model u is established RE The following are provided:
wherein u is RE Is the equivalent energy density of rock mass alpha 1 And beta 1 Fitting coefficients of the energy density relation of the rock to be tested while drilling.
S104: as shown in fig. 3, an in-situ drilling test of a field rock mass is developed by using the intelligent rotary cutting test system 1 for the rock mass, the while-drilling parameters and the cutting energy density of the field rock mass are obtained, and the equivalent energy density u of the field rock mass is obtained RE 。
According to the rock mass equivalent energy density u RE Determining a surrounding rock energy grading index U in the range of underground engineering supporting direction RE The following are provided:
wherein U is RE For surrounding rock energy in the supporting direction range of underground engineering, u REm In-situ rock energy density (m=1, 2, 3, …, n) within the mth section length of the underground works trend, V m Is the volume of surrounding rock in the length of the m section of the trend of underground engineering.
S105: according to the site rock mass original energy grading index U RE And measuring the storable amount of the rock energy in the required support range, and grading the rock energy. In practice, the surrounding rock energy U may be preset RE And the corresponding relation of the energy grading range. As shown in table 1, the energy classification of the surrounding rock can be divided into low energy storage rock mass J 1 Rock mass J 2 And high energy storage rock mass J 3 . Low energy storage rock mass J 1 The range of the corresponding surrounding rock energy URE is that y1 is less than or equal to URE < y2, and the middle energy storage rock mass J 2 The range of the corresponding surrounding rock energy URE is that y2 is less than or equal to URE < y3 and the high energy storage rock mass J 3 The range of the corresponding surrounding rock energy URE is y 3-y 4.
TABLE 1
In-situ drilling test of rock mass on site is developed by using rock mass intelligent rotary cutting test system 1, and surrounding rock energy grading index U in underground engineering supporting direction range is determined RE According to the energy grading index U of the surrounding rock RE Surrounding rock energy classification thresholds y1, y2, y3 and y4 are determined based on surrounding rock energy U RE And determining the surrounding rock energy classification of the rock mass to be evaluated according to the corresponding relation between the surrounding rock energy classification range and the energy classification range.
As shown in table 1, if the surrounding rock energy of the rock mass is greater than or equal to a first threshold y1 and less than a second threshold y2, determining the surrounding rock of the rock mass to be evaluated as a low energy storage rock mass J 1 . If the surrounding rock energy of the rock mass is larger than or equal to the second threshold value y2 and smaller than the third threshold value y3, determining the surrounding rock of the rock mass to be evaluated as the medium energy storage rock mass J 2 . If the surrounding rock energy of the rock mass is larger than or equal to a third threshold value y3 and smaller than or equal to a fourth threshold value y4, determining the surrounding rock of the rock mass to be evaluated as a high energy storage rock mass J 3 。
According to the storable energy of the drilling rock mass, gradient grading of the on-site rock energy is achieved, and further the internal energy of the on-site in-situ rock mass is rapidly and accurately measured, so that guidance is provided for selection of an on-site support system. The design of the supporting scheme is determined, and the concrete supporting scheme comprises the step of determining the supporting member 2 and the protective net 3.
The verification optimization is to determine the energy U of surrounding rock in the supporting direction range of underground engineering by carrying out in-situ drilling test of the rock mass on site RE And surrounding rock energy grading is carried out, firstly, the validity and the accuracy of the rock mass equivalent energy density while drilling test model established in the earlier stage are verified, and secondly, the rock mass equivalent energy density while drilling test model is further feedback optimized by carrying out rock mass drilling tests of different lithologies and different strength types on site.
S106: according to the rock energy grading result, carrying out support design on surrounding rock in the underground engineering support direction range, determining an on-site rock energy support design evaluation method, and determining the energy absorption U of a support member Is provided with The following are provided:
wherein a is the safety coefficient (a > 1) of the energy support, U RE Surrounding rock energy in the supporting direction range of underground engineering.
According to the method, a rock mass drilling test is carried out, rotary cutting energy consumption analysis is carried out on a rock mass, while drilling parameters of the rock mass are synthesized, and a rock mass cutting energy density formula based on the while drilling parameters is established. And (3) carrying out a rock uniaxial compression loading and unloading test, integrating a rock loading and unloading curve to obtain rock elastic energy density, and establishing a quantitative relation between rock mass cutting energy density and rock elastic energy density to obtain a rock mass equivalent energy density calculation formula. The intelligent rotary cutting testing system 1 for rock mass is utilized to develop an in-situ drilling test of the rock mass on site, the equivalent energy density of the rock mass on site is determined, the standard energy grading index of the rock mass on site is established, the standard energy grading of the rock mass on site is realized, and a basis is provided for the design of surrounding rock support.
Although the present invention has been described in terms of the preferred embodiments, it is not intended to be limited to the embodiments, and any person skilled in the art can make any possible variations and modifications to the technical solution of the present invention by using the methods and technical matters disclosed above without departing from the spirit and scope of the present invention, so any simple modifications, equivalent variations and modifications to the embodiments described above according to the technical matters of the present invention are within the scope of the technical matters of the present invention.
Claims (9)
1. The method for in-situ measurement and control design of the rock energy while drilling is characterized by comprising the following steps of:
carrying out rotary cutting energy consumption analysis on a rock body by developing a rock body drilling test, and establishing a rock body cutting energy density calculation formula based on the while-drilling parameters by integrating the drilling speed V, the bit rotating speed N, the drilling torque M and the drilling pressure F of the rock body;
developing a rock uniaxial compression loading and unloading test, obtaining rock elastic energy density by integrating a rock loading and unloading curve, and establishing a rock mass isokinetic energy density while drilling test model;
performing in-situ drilling test of the rock mass on site, determining the equivalent energy density of the rock mass on site, establishing the site rock mass original energy grading index, and realizing the site rock mass original energy grading;
the method comprises the steps of determining the on-site rock mass equivalent energy density, carrying out on-site rock mass in-situ drilling test by using a rock mass intelligent rotary cutting test system, and obtaining on-site in-situ rock mass while-drilling parameters and rock mass cutting energy density to obtain on-site rock mass equivalent energy density;
and selecting a reasonable on-site surrounding rock support design scheme according to the on-site rock mass original energy grading result.
2. The method for in-situ measurement while drilling and control design of rock energy according to claim 1, wherein during cutting of rock mass, torque increment Δm is generated during drilling under the influence of friction between drill rod and borehole wall, and the actual torque is M- Δm.
3. The method for in-situ measurement while drilling and control design of rock energy according to claim 1, wherein the rock elastic energy density is calculated by performing a rock uniaxial compression loading and unloading test, setting a first loading intensity, unloading the rock, unloading the compression intensity to the set intensity, loading the rock again until the rock is destroyed, at this time, drawing a stress strain curve in the rock loading process, and integrating a graph enclosed by an unloading curve and the peak intensity in the rock loading and unloading curve.
4. The method for in-situ measurement while drilling and control design of rock mass energy according to claim 1, wherein the rock mass isokinetic energy density while drilling test model is established by performing regression fit analysis on the rock mass cutting energy density and the rock elastic energy density.
5. The method for in-situ measurement while drilling and control design of rock energy according to claim 1, wherein the energy of the surrounding rock in the supporting direction range of the underground engineering is determined according to the equivalent energy density of the rock mass and the volume of the surrounding rock in the running direction of the underground engineering.
6. The method of in situ measurement while drilling and control design of rock mass energy of claim 5, wherein the storable amount of rock mass energy in the desired support range is measured based on the in situ rock mass energy, and the rock mass is energy graded.
7. The method of in situ measurement while drilling and control design of rock energy of claim 6, wherein classifying the rock mass into three energy classes comprises:
if the energy of surrounding rock in the supporting direction range of the underground engineering is larger than or equal to a first threshold value and smaller than a second threshold value, determining that the energy storable quantity of rock in the required supporting range is a low energy storage rock;
if the energy of surrounding rock in the supporting direction range of the underground engineering is larger than or equal to the second threshold value and smaller than the third threshold value, determining that the energy storable quantity of rock in the required supporting range is a medium energy storage rock;
and if the energy of surrounding rock in the supporting direction range of the underground engineering is larger than or equal to the third threshold value and smaller than or equal to the fourth threshold value, determining that the energy storable quantity of the rock mass in the required supporting range is a high energy storage rock mass.
8. The method for in-situ measurement while drilling and control design of rock mass energy according to claim 7, wherein the gradient grading of the in-situ rock mass energy is realized according to the storable energy of the drilling rock mass, and further the in-situ rock mass internal energy measurement is realized.
9. The method for in-situ measurement while drilling and control design of rock energy according to claim 1, wherein the surrounding rock in the supporting direction range of the underground engineering is supported and designed according to the rock energy grading result, the on-site rock energy supporting design evaluation method is determined, and the energy absorption of the supporting member is determined.
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| CN107061395A (en) * | 2017-04-13 | 2017-08-18 | 宜昌精博艺工程机械设备制造有限公司 | Rock drill air defense is hit, anti-sticking energy-saving type Hydraulic system and control method |
| CN115932966A (en) * | 2022-12-27 | 2023-04-07 | 中国石油大学(华东) | Method for estimating micro-crack porosity and nonlinear characteristic index of rock at different temperatures |
| CN116029159A (en) * | 2023-03-23 | 2023-04-28 | 中国矿业大学(北京) | Rotary-cut drilling in-situ detection method for surrounding rock of underground engineering |
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| CN115932966A (en) * | 2022-12-27 | 2023-04-07 | 中国石油大学(华东) | Method for estimating micro-crack porosity and nonlinear characteristic index of rock at different temperatures |
| CN116029159A (en) * | 2023-03-23 | 2023-04-28 | 中国矿业大学(北京) | Rotary-cut drilling in-situ detection method for surrounding rock of underground engineering |
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