CN114961716A - Method for evaluating rock mass properties and degradation characteristics while drilling - Google Patents
Method for evaluating rock mass properties and degradation characteristics while drilling Download PDFInfo
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Abstract
The application belongs to the technical field of geotechnical engineering investigation, and relates to a method for evaluating rock mass properties and degradation characteristics while drilling. The method comprises the following steps: carrying out a digital drilling test on a rock mass to be evaluated by using digital drilling equipment for assembling a core bit, and acquiring while-drilling parameters of the rock mass to be evaluated and response characteristics corresponding to the while-drilling parameters; determining an integrity coefficient calculation formula of the rock mass to be evaluated according to the response characteristics corresponding to the while-drilling parameters of the rock mass to be evaluated; carrying out a digital drilling test on the underground engineering surrounding rock by using digital drilling equipment, and evaluating the integrity degree of the surrounding rock based on the integrity coefficient; and establishing a degradation property while-drilling evaluation model according to the integrity coefficient, the degradation coefficient and the equivalent strength of the rock mass to be evaluated. By adopting the method and the device, the rock strength and the integrity degree can be accurately tested in situ, and the rock property and the degradation characteristic can be evaluated while drilling.
Description
Technical Field
The application relates to the technical field of geotechnical engineering investigation, in particular to a method for evaluating rock mass properties and degradation characteristics while drilling.
Background
The deep geological condition is very complicated, and as underground projects such as mine roadways and traffic tunnels are continuously developed to the deep part, rock mass cracks are developed and broken seriously, the problems that a supporting system is broken and fails and the like are easily caused, and safety accidents such as large deformation, roof fall and serious floor heave of surrounding rocks of the roadways are frequent. The evaluation of the deterioration property of the rock mass is the premise of reasonable design and safety control of the chamber support.
In the prior art, the deterioration of rock mass is usually evaluated by coring the surrounding rock and transporting the core to a laboratory for strength and integrity testing. The core is easy to break and destroy in the coring and conveying processes, so that the error of the test result is large.
Therefore, when testing the deterioration property of the rock body, how to improve the testing accuracy is a technical problem to be solved.
Disclosure of Invention
In view of the above, it is necessary to provide a method for evaluating the properties and deterioration characteristics of a rock mass while drilling.
In a first aspect, a method for while-drilling evaluation of rock mass properties and degradation characteristics is provided, the method comprising:
carrying out a digital drilling test on a rock mass to be evaluated by using digital drilling equipment for assembling a core bit, and acquiring while-drilling parameters of the rock mass to be evaluated and response characteristics corresponding to the while-drilling parameters;
determining an integrity coefficient calculation formula of the rock mass to be evaluated according to the response characteristics corresponding to the while-drilling parameters of the rock mass to be evaluated, wherein the integrity coefficient calculation formula comprises the following steps:
wherein RID is the integrity factor,Min order to be the torque, the torque is,Fin order to achieve the weight-on-bit,Hin order to provide the total drilling depth,L Mi for torque identificationiThe width of each of the cracks is,M a is the critical value of the torque, and the torque is,L Fi for weight on bit identificationiThe width of each of the cracks is,F b the bit pressure is a critical value of the bit pressure,nthe total number of the cracks is the total number of the cracks,i=1,2… n；
carrying out a digital drilling test on the underground engineering surrounding rock by using digital drilling equipment, and evaluating the integrity degree of the surrounding rock based on the integrity coefficient;
and establishing a deterioration property while-drilling evaluation model according to the integrity coefficient, the deterioration coefficient and the equivalent strength of the rock mass to be evaluated, and realizing the classification of the deterioration property of the surrounding rock.
As an alternative embodiment, the performing the digital drilling test on the underground engineering surrounding rock by using the digital drilling equipment, and evaluating the integrity degree of the surrounding rock based on the integrity coefficient comprises the following steps:
if the integrity coefficient is larger than or equal to a first threshold value and smaller than or equal to a second threshold value, determining that the integrity degree of the surrounding rock to be evaluated is extremely broken surrounding rock;
if the integrity coefficient is larger than the second threshold and smaller than or equal to a third threshold, determining that the integrity degree of the surrounding rock to be evaluated is a medium-broken surrounding rock;
if the integrity coefficient is larger than the third threshold and smaller than or equal to a fourth threshold, determining that the integrity degree of the surrounding rock to be evaluated is relatively broken surrounding rock;
and if the integrity coefficient is larger than the fourth threshold and smaller than or equal to a fifth threshold, determining that the integrity degree of the surrounding rock of the rock mass to be evaluated is complete surrounding rock.
As an optional implementation manner, the establishing a model for evaluating the deterioration property of the rock mass to be evaluated while drilling according to the integrity coefficient, the deterioration coefficient and the equivalent strength of the rock mass to be evaluated to realize classification of the deterioration property of the surrounding rock includes:
determining the equivalent strength of the rock mass to be evaluated according to the while-drilling parameters;
and realizing the classification of the deterioration properties of the surrounding rocks according to the integrity coefficient, the deterioration coefficient, the equivalent strength and a pre-established deterioration property while-drilling evaluation model of the rock mass to be evaluated.
As an alternative embodiment, the while drilling parameters of the rock mass include: drilling speed, rotational speed, weight on bit and torque; the equivalent strength formula of the rock mass to be evaluated is determined according to the while-drilling parameters and is as follows:
wherein,ECSin order to be of an equivalent strength,Nin order to set the rotational speed of the drill bit,Vin order to be the rate of penetration,Min order to achieve a drilling torque,Fin order to achieve the drilling pressure,Rin order to be the radius of the drill bit,L 1 、L 2 、L 3 for each row of cutting edge lengths,α、βin order to be a coefficient of fit,μis the coefficient of friction.
As an optional implementation manner, the formula for establishing the degradation property while-drilling evaluation model according to the integrity coefficient, the degradation coefficient and the equivalent strength of the rock mass to be evaluated is as follows:
DCS=k v ×RID×ECS
wherein,DCSis the deterioration strength of the rock mass,k v to be a degradation coefficient, RID is an integrity coefficient,ECSis the equivalent intensity.
As an optional implementation mode, the digital drilling equipment comprises a guide drilling system, a hydraulic servo system, a monitoring control system, a test auxiliary system and a core bit, and has two control and monitoring modes of drilling speed-rotating speed and drilling pressure-rotating speed, so that accurate control and real-time monitoring of drilling parameters in the drilling process of the underground engineering surrounding rock can be realized;
coring bit is the diamond compact drill bit, by inside the square diamond compact embedding annular matrix of multiunit, the cutting ring sword of formation.
In a second aspect, there is provided an apparatus for assessing rock mass properties and degradation characteristics while drilling, the apparatus comprising:
the device comprises an acquisition module, a data acquisition module and a data processing module, wherein the acquisition module is used for carrying out a digital drilling test on a rock mass to be evaluated by using digital drilling equipment provided with a core bit, and acquiring while-drilling parameters of the rock mass to be evaluated and response characteristics corresponding to the while-drilling parameters;
the determining module is used for determining an integrity coefficient calculation formula of the rock mass to be evaluated according to the response characteristics corresponding to the while-drilling parameters of the rock mass to be evaluated, and the integrity coefficient calculation formula comprises the following steps:
wherein RID is the integrity factor,Min order to be the torque, the torque is,Fin order to achieve the weight-on-bit,Has a result of the total drilling depth,L Mi identified for torqueiThe width of each of the cracks is,M a is the critical value of the torque, and the torque is,L Fi for weight on bit identificationiThe width of each of the cracks is,F b the bit pressure is a critical value of the bit pressure,nthe total number of the cracks is the total number of the cracks,i=1,2… n；
the evaluation module is used for carrying out a digital drilling test on the underground engineering surrounding rock by using digital drilling equipment and evaluating the integrity degree of the surrounding rock based on the integrity coefficient;
and the establishing module is used for establishing a deterioration property while-drilling evaluation model according to the integrity coefficient, the deterioration coefficient and the equivalent strength of the rock mass to be evaluated so as to realize the classification of the deterioration property of the surrounding rock.
As an optional implementation manner, the evaluation module is specifically configured to:
if the integrity coefficient is larger than or equal to a first threshold value and smaller than or equal to a second threshold value, determining that the integrity degree of the surrounding rock to be evaluated is extremely broken surrounding rock;
if the integrity coefficient is larger than the second threshold and smaller than or equal to a third threshold, determining that the integrity degree of the surrounding rock to be evaluated is a medium-broken surrounding rock;
if the integrity coefficient is larger than the third threshold and smaller than or equal to a fourth threshold, determining that the integrity degree of the surrounding rock to be evaluated is relatively broken surrounding rock;
and if the integrity coefficient is larger than the fourth threshold and smaller than or equal to a fifth threshold, determining that the integrity degree of the surrounding rock of the rock mass to be evaluated is complete surrounding rock.
As an optional implementation manner, the establishing module is specifically configured to:
determining the equivalent strength of the rock mass to be evaluated according to the while-drilling parameters;
and establishing a deterioration property while-drilling evaluation model according to the integrity coefficient, the deterioration coefficient and the equivalent strength of the rock mass to be evaluated, and realizing the classification of the deterioration property of the surrounding rock.
As an optional implementation mode, the digital drilling equipment comprises a guide drilling system, a hydraulic servo system, a monitoring control system, a test auxiliary system and a core bit, and has two control and monitoring modes of drilling speed-rotating speed and drilling pressure-rotating speed, so that accurate control and real-time monitoring of drilling parameters in the drilling process of the underground engineering surrounding rock can be realized;
coring bit is the diamond compact drill bit, by inside the square diamond compact embedding annular matrix of multiunit, the cutting ring sword of formation.
In a third aspect, a computer device is provided, comprising a memory and a processor, the memory having stored thereon a computer program operable on the processor to, when executed, perform the method steps of the first aspect.
In a fourth aspect, a computer-readable storage medium is provided, having stored thereon a computer program which, when being executed by a processor, carries out the method steps of the first aspect.
The application provides a method for evaluating rock mass properties and degradation characteristics while drilling, and the technical scheme provided by the embodiment of the application at least has the following beneficial effects: this application is at the in-process of boring the rock mass through digital drilling equipment, directly confirms the complete degree and the rock mass degradation strength of country rock. On the one hand, the core does not need to be taken out of the rock body, the integrity of the rock body is protected, and the cost of coring and transporting to a laboratory is saved. On the other hand, the rock mass is prevented from being manually cracked during coring and conveying, the error of the evaluation experiment result of the degradation property of the rock mass is reduced, and the detection accuracy is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flowchart of an example of a method for evaluating rock mass properties and degradation characteristics while drilling according to an embodiment of the present disclosure;
FIG. 2 is a schematic illustration of a wall rock degradation property classification and a visual three-dimensional plot;
FIG. 3 is a schematic structural diagram of a system for evaluating rock mass properties and degradation characteristics while drilling according to an embodiment of the present disclosure;
FIG. 4 is a schematic structural diagram of a method for evaluating rock mass properties and degradation characteristics while drilling according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a computer device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Fig. 1 is a flowchart of an example of a method for evaluating a rock property and a degradation characteristic while drilling according to an embodiment of the present application, and as shown in fig. 1, a drill bit speed V, a drill bit rotation speed N, a drilling pressure F, and a drilling torque M are obtained through an indoor rock digital drilling experiment by the method for evaluating the rock property and the degradation characteristic while drilling. And the control equipment performs rock integrity analysis and rock compressive strength analysis on the rock to be evaluated through the drill speed V, the drill speed N, the drilling pressure F and the drilling torque M. And the control equipment performs rock integrity analysis on the rock to be evaluated, determines the integrity coefficient RID of the rock to be evaluated and determines the integrity degree based on the integrity coefficient. Wherein, the integrity degree of the surrounding rock can be extremely broken surrounding rock, medium broken surrounding rock, relatively broken surrounding rock and intact surrounding rock. When the control equipment analyzes the compressive strength of the rock mass to be evaluated, the cutting energy analysis and the cutting strength analysis are firstly carried out on the rock mass to be evaluated, and the cutting energy and the cutting strength of the rock mass are obtained. And the control equipment respectively performs linear regression analysis on the cutting energy and the cutting strength of the rock mass to determine the equivalent strength of the rock mass. The controller inputs the integrity coefficient and the equivalent strength of the rock mass into a pre-constructed degradation property while-drilling evaluation model, and determines the rock mass degradation strength of the rock mass to be evaluatedDCS. When a technician carries out a digital drilling test on the underground engineering surrounding rock, the method for evaluating the rock mass property and the deterioration characteristic while drilling is adopted to classify the deterioration property of the surrounding rock, and the integrity coefficient RID and the deterioration strength of the rock mass are obtainedDCSThe method comprises the steps of classifying the deterioration properties of surrounding rocks and displaying a visual three-dimensional graph. When the technical personnel carries out the digital drilling test of the underground engineering surrounding rock, the integrity coefficient RID and the rock deterioration strength of the rock to be evaluated can be determinedDCSAnd carrying out verification optimization.
FIG. 2 is a schematic illustration of a wall rock degradation property classification and a visual three-dimensional map. As shown in figure 2, the rock mass is divided into a rock stratum 1, a rock stratum 2, a rock stratum 3 and a rock stratum 4, the control device selects three drill holes in the depth direction of the chamber and controls the digital drilling equipment to perform digital drilling on the rock mass from the three drill holes to the deep layer of the rock mass. The control equipment obtains the while-drilling parameters of the rock mass and the response characteristics corresponding to the while-drilling parameters, and determines the integrity degree of the surrounding rock based on the response characteristics corresponding to the while-drilling parameters of the rock mass. The technician determines the integrity of the surrounding rock from the chamber to the deep layer as the extremely-broken surrounding rock, the relatively-broken surrounding rock and the complete surrounding rock, and determines the widths of the extremely-broken surrounding rock, the relatively-broken surrounding rock and the complete surrounding rock.
The method for evaluating the rock mass property and the degradation characteristic while drilling provided by the embodiment of the application can be applied to a system for evaluating the rock mass property and the degradation characteristic while drilling. Fig. 3 is a schematic structural diagram of a system for evaluating rock mass properties and degradation characteristics while drilling according to an embodiment of the present application. As shown in fig. 3, the system for while-drilling evaluation of rock mass properties and degradation characteristics comprises a digital drilling rig 110 and a control device 120. Digital drilling equipment 110: the method is used for acquiring the while-drilling parameters of the rock mass to be evaluated and the response characteristics corresponding to the while-drilling parameters of the rock mass to be evaluated in the process of performing digital drilling on the rock mass to be evaluated, and sending the acquired while-drilling parameters of the rock mass and the response characteristics corresponding to the while-drilling parameters of the rock mass to the control equipment 120. Wherein the while-drilling parameters of the rock mass include: rotational speed, torque, rate of penetration, and weight on bit. The response characteristics corresponding to the while-drilling parameters of the rock mass comprise: the fracture width of the fracture identified by weight on bit, the fracture width of the fracture identified by torque, and the total drilling depth. The control device 120: the method is used for determining the integrity coefficient of the rock mass to be evaluated according to the response characteristics corresponding to the while-drilling parameters of the rock mass, determining the integrity degree of the surrounding rock of the rock mass to be evaluated according to the integrity coefficient of the rock mass, and determining the rock mass strength of the rock mass to be evaluated according to the degradation coefficient of the rock mass to be evaluated, the while-drilling parameters of the rock mass and the integrity coefficient of the rock mass. Then, the control device 120 determines the integrity of the surrounding rock of the rock mass to be evaluated and the rock mass strength as the deterioration property of the rock mass to be evaluated.
This application is at the in-process of boring the rock mass through digital drilling equipment, directly confirms the complete degree and the rock mass degradation strength of country rock. On the one hand, the core does not need to be taken out of the rock body, the integrity of the rock body is protected, and the cost of coring and transporting to a laboratory is saved. On the other hand, the rock mass is prevented from being manually cracked during coring and conveying, the error of the evaluation experiment result of the degradation property of the rock mass is reduced, and the detection accuracy is improved.
The method for evaluating rock mass properties and degradation characteristics while drilling provided by the embodiment of the application is described in detail below with reference to specific embodiments, and the specific steps are as follows:
the method comprises the following steps of firstly, carrying out a digital drilling test on a rock mass to be evaluated by using digital drilling equipment provided with a core bit, and acquiring the while-drilling parameters of the rock mass to be evaluated and response characteristics corresponding to the while-drilling parameters.
In practice, when a technician needs to obtain the deterioration properties of the rock mass to be evaluated, the technician can deploy a digital drilling experiment on the rock mass to be evaluated by using digital drilling equipment equipped with a core bit. In the process of carrying out rock mass digital drilling on a rock mass to be evaluated, the digital drilling equipment can acquire the while-drilling parameters of the rock mass to be evaluated and the response characteristics corresponding to the while-drilling parameters of the rock mass to be evaluated, and send the acquired while-drilling parameters of the rock mass and the response characteristics corresponding to the while-drilling parameters of the rock mass to the control equipment. Wherein the parameters while drilling of the rock mass comprise rotating speed, torque, drilling speed and drilling pressure. As the total drilling depth increases, the torque value decreases abruptly when the core bit encounters a fracture, the weight-on-bit value decreases abruptly, and the torque and weight-on-bit values return to values near the values before the decrease as the core bit passes through the fracture. Wherein the torque and weight-on-bit values are within respective threshold ranges. Based on the above principle, the control device can identify the fracture width of the fracture through the torque and total drilling depth variation curves and the weight and total drilling depth variation curves.
For example, when the total drilling depth is fromH1To achieveH2When the torque suddenly drops, fromM1Suddenly fall toM2. When the total drilling depth is fromH2To achieveH3When the torque rises suddenly, fromM2Suddenly rise toM3Then, the total drilling depth of the coring bit isH1ToH3Meet a crack with a crack width ofH3-H1。
For example, when the total drilling depth is fromH1To achieveH2While, the bit pressure drops suddenly fromM1Suddenly fall toM2. When the total drilling depth is fromH2To achieveH3While, the bit pressure rises suddenly fromM2Suddenly rise toM3Then, the total drilling depth of the coring bit isH1ToH3Meet a crack with a crack width ofH3-H1。
As an alternative embodiment, the digital drilling equipment includes a pilot drilling system, a hydraulic servo system, a monitor control system, a test assist system, and a core bit. The coring bit is a diamond composite sheet bit, and a plurality of groups of square diamond composite sheets are embedded into the annular matrix to form a cutting annular blade. Based on digital drilling equipment, by utilizing two control and monitoring modes of drilling speed-rotating speed and drilling pressure-rotating speed, accurate control and real-time monitoring of drilling parameters in the drilling process of the underground engineering surrounding rock can be realized.
Determining an integrity coefficient calculation formula of the rock mass to be evaluated according to the response characteristics corresponding to the drilling parameters of the rock mass to be evaluated, wherein the integrity coefficient calculation formula comprises the following steps:
wherein RID is the integrity factor,Min order to be the torque, the torque is,Fin order to achieve the weight-on-bit,Has a result of the total drilling depth,L Mi identified for torqueiThe width of each of the cracks is,M a is a critical value of the torque, and is,L Fi for weight on bit identificationiThe width of each of the cracks is,F b the bit pressure is a critical value of the bit pressure,nis the total number of the cracks,i=1,2… n。
in implementation, in the process of carrying out rock mass digital drilling on a rock mass to be evaluated by the control equipment, according to the response characteristics corresponding to the drilling parameters of the rock mass, the fracture width of the fracture identified by the bit pressure, the fracture width of the fracture identified by the torque and the total drilling depth can be obtained. From the fracture width of the fracture identified by weight-on-bit and the fracture width of the fracture identified by torque, the technician can determine the sum of the widths of the fractures. Based on the sum of the widths of the fractures and the total drilling depth, the integrity coefficient of the rock mass to be evaluated can be determined. Based on the principle, the control equipment determines the integrity coefficient of the rock mass to be evaluated according to the response characteristics corresponding to the obtained drilling parameters of the rock mass. Wherein the integrity coefficient of the rock mass is used for evaluating the integrity degree of the surrounding rock.
And step three, carrying out a digital drilling test on the underground engineering surrounding rock by using digital drilling equipment, and evaluating the integrity degree of the surrounding rock based on the integrity coefficient.
In implementation, the control device may store a corresponding relationship between the integrity degree of the surrounding rock and the range of the integrity coefficient in advance. As shown in table 1, the integrity of the surrounding rock can be classified into a very broken surrounding rock, a medium broken surrounding rock, a relatively broken surrounding rock and an intact surrounding rock. The range of the integrity coefficient corresponding to the extremely-broken surrounding rock is c 1-RID 2, the range of the integrity coefficient corresponding to the medium-broken surrounding rock is c 2-RID-c 3, the range of the integrity coefficient corresponding to the relatively-broken surrounding rock is c 3-RID-c 4, and the range of the integrity coefficient corresponding to the complete surrounding rock is c 4-RID-c 5.
TABLE 1
And after the control equipment obtains the integrity coefficient of the rock mass, determining the integrity degree of the surrounding rock of the rock mass to be evaluated based on the corresponding relation between the integrity degree of the surrounding rock and the range of the integrity coefficient.
As shown in table 1, if the integrity coefficient of the rock mass is equal to or greater than the first threshold value c1 and equal to or less than the second threshold value c2, the control apparatus determines that the integrity degree of the surrounding rock of the rock mass to be evaluated is extremely broken surrounding rock. And if the integrity coefficient of the rock mass is larger than the second threshold value c2 and is smaller than or equal to the third threshold value c3, the control equipment determines that the integrity degree of the surrounding rock of the rock mass to be evaluated is medium-fracture surrounding rock. And if the integrity coefficient of the rock mass is larger than the third threshold value c3 and is smaller than or equal to the fourth threshold value c4, the control equipment determines that the integrity degree of the surrounding rock of the rock mass to be evaluated is relatively broken surrounding rock. And if the integrity coefficient of the rock mass is larger than the fourth threshold value c4 and is smaller than or equal to the fifth threshold value c5, the control equipment determines that the integrity degree of the surrounding rock of the rock mass to be evaluated is complete surrounding rock.
Further, the total drilling depth may be the sum of the lengths of each section of drill pipe that drills into the rock mass. The control equipment can divide the width corresponding to the integrity degree of the surrounding rock according to the response characteristics corresponding to the drilling parameters of the rock mass of the same drilling hole in the digital drilling experiment process. Wherein the current number of the drill rods which are drilled into the rock body in the same hole is represented by n,H i the drill rod length of the i-th section of drill rod is shown,i=1, 2, … n。
when n =1, the integrity coefficient RID of the rock mass is brought in by an RID calculation formula to obtain the RID at the moment, the RID is judged to be not less than c1 and not more than c2, if the conditions are met, the drill rod is continuously added until the conditions that c1 and not more than c2 are not met and the conditions that c2 and not more than c3 are met, and the width of the extremely-broken surrounding rock is that
. Wherein Z is 1 Indicating the width of the extremely fragmented surrounding rock.
When n = p +1, the integrity coefficient RID of the rock mass is brought into the formula to obtain the RID at the moment, the RID is judged to be not less than c2 and not more than c3, if the conditions are met, the drill rod is continuously added until n = q does not meet the conditions that c2 and not more than c3 and the RID is not more than c3 and not more than c4, the width of the medium-sized broken surrounding rock is equal to that of the medium-sized broken surrounding rock
. Wherein Z is 2 Indicating the width of the moderately fractured surrounding rock.
When n = q +1, the integrity coefficient RID of the rock mass is brought into the calculation formula to obtain the RID at the moment, the RID is judged to be more than or equal to c3 and less than or equal to c4, if the conditions are met, the drill rod is continuously added until n = s does not meet the conditions that c3 is more than or equal to RID and less than or equal to c4 and the RID is more than or equal to c4 and less than or equal to c5, the width of the broken surrounding rock is larger than that of the broken surrounding rock
. Wherein Z is 3 Indicating the width of the relatively broken surrounding rock.
Calculating formula of integrity coefficient RID brought into rock mass when n = s +1Obtaining the RID at the moment, judging that the RID is not less than c4 and not more than c5, if the conditions are met, continuously adding the drill rod until n = r does not meet the conditions that c4 and not more than c5 and the width of the complete surrounding rock is
. Wherein Z is 4 Representing the width of the complete surrounding rock.
And step four, establishing a deterioration property while-drilling evaluation model according to the integrity coefficient, the deterioration coefficient and the equivalent strength of the rock mass to be evaluated, and realizing the classification of the deterioration property of the surrounding rock.
In implementation, the deterioration property while-drilling evaluation model of the rock mass to be evaluated is established to be related to the integrity coefficient, the deterioration coefficient and the equivalent strength of the rock mass to be evaluated. Therefore, the control equipment realizes the classification of the deterioration properties of the surrounding rocks according to the integrity coefficient, the deterioration coefficient and the equivalent strength of the rock mass to be evaluated and a pre-established deterioration property while-drilling evaluation model.
Optionally, the control device implements a detailed processing procedure of classification of the degradation property of the surrounding rock according to the integrity coefficient, the degradation coefficient, the equivalent strength of the rock mass to be evaluated, and a pre-established degradation property while-drilling evaluation model, as follows:
and step A, determining the equivalent strength of the rock mass to be evaluated according to the while-drilling parameters.
In implementation, based on the principle of mechanical balance, the control equipment can calculate and obtain rock cutting strength or rock cutting energy according to the while-drilling parameters of the rock, perform regression fitting analysis based on the rock cutting strength and the uniaxial compressive strength obtained by coring rock testing, and establish a regression fitting equation corresponding to the rock cutting strength or perform regression fitting analysis on the rock cutting energy and the uniaxial compressive strength obtained by coring rock testing, and establish a regression fitting equation corresponding to the rock cutting energy to determine the equivalent strength of the rock to be evaluated.
The method comprises the following steps that on the basis of a regression fitting equation corresponding to the cutting strength of the rock mass, control equipment determines a formula of equivalent strength of the rock mass to be evaluated according to the drilling parameters of the rock mass as follows:
wherein,ECSrepresents the equivalent intensity, S C Representing the cutting strength of rock mass, N representing the rotation speed, M representing the torque, V representing the drilling speed, F representing the weight on bit, a, b representing the fitting coefficient, delta representing the friction angle, k representing the cutting edge inclination angle, gamma representing the cutting angle, R representing the drill radius, L 1 、L 2 、L 3 The cutting edge length of each row is shown, and m is the number of rows of cutting edges.
In a second mode, based on a regression fitting equation corresponding to the cutting energy of the rock mass, the formula for determining the equivalent strength of the rock mass to be evaluated by the control equipment is as follows:
wherein,ECSrepresenting the equivalent strength, eta the rock mass cutting energy, N the bit rotation speed, V the rate of penetration, M the torque of penetration, F the pressure of penetration, R the bit radius, L 1 、L 2 、L 3 The cutting edge length of each row is shown, α and β are fitting coefficients, and μ is a friction coefficient.
Bringing eta into
In the method, the formula for determining the equivalent strength of the rock mass to be evaluated can be further converted into:
。
and step B, according to the integrity coefficient, the degradation coefficient and the equivalent strength of the rock mass to be evaluated and a pre-established degradation property while-drilling evaluation model, the degradation property classification of the surrounding rock is realized.
In implementation, a technician may construct a deterioration property while-drilling evaluation model in advance based on the integrity coefficient, the deterioration coefficient, and the equivalent strength of the rock mass. And the control equipment inputs the integrity coefficient, the degradation coefficient and the equivalent strength of the rock mass to be evaluated into a degradation property while-drilling evaluation model, and determines the rock mass degradation strength of the rock mass to be evaluated. In the rock masses with different strength grades, the calculation results of the deterioration strength of the rock masses are different under the condition that the integrity coefficients of the rock masses are equal. And (3) performing regression analysis on experimental data through digital drilling experiments under rock masses with different strength grades to obtain the degradation coefficient within a certain strength grade range.
As an optional implementation manner, according to the integrity coefficient, the degradation coefficient and the equivalent strength of the rock mass to be evaluated, the formula for establishing the degradation property while-drilling evaluation model is as follows:
DCS=k v ×RID×ECS
wherein,DCSwhich indicates the strength of the deterioration of the rock mass,k v representing a degradation coefficient, RID representing an integrity coefficient,ECSis the equivalent intensity.
Further, the technician determines the integrity of the surrounding rock of the rock mass to be evaluated and the strength of the rock mass as the deterioration property of the rock mass to be evaluated.
Furthermore, the measured deterioration property of the Rock mass to be evaluated is compared with the deterioration property of the Rock mass to be evaluated measured by a RQD (Rock Quality indicator) method for verification, and the accuracy of the calculated deterioration property of the Rock mass to be evaluated is judged.
Further, carrying out a digital drilling test on the underground engineering surrounding rock by using digital drilling equipment, selecting j drilling test sections in the chamber depth direction, selecting w drill holes on each section, and expressing the number of the drill holes as D jw Wherein j, w =1, 2, …, n, by a wall rock drilling test, resulting in a borehole D jw Comprehensively analyzing the drilling information in the drilling test range of the surrounding rock according to the corresponding compressive strength and integrity coefficient, and constructing the deterioration of the surrounding rockProperty classification and visual three-dimensional maps. Wherein, the chamber is a horizontal gallery which is not directly communicated with an earth surface outlet, has a larger cross section and a shorter length. The device is used for installing various devices and machines, storing materials and tools, or performing other special purposes, such as machine room repairing, explosive storehouse, rest room and the like.
The embodiment of the application provides a method for evaluating rock mass properties and degradation characteristics while drilling. On the one hand, the core does not need to be taken out of the rock body, the integrity of the rock body is protected, and the cost of coring and transporting to a laboratory is saved. On the other hand, the rock mass is prevented from being easily broken by manpower during coring and conveying, the error of the evaluation experiment result of the degradation property of the rock mass is reduced, and the detection accuracy is improved.
It should be understood that, although the steps in the flowchart of fig. 1 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 1 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.
It is understood that the same/similar parts between the embodiments of the method described above in this specification can be referred to each other, and each embodiment focuses on the differences from the other embodiments, and it is sufficient that the relevant points are referred to the descriptions of the other method embodiments.
The embodiment of the application also provides a device for evaluating rock mass properties and degradation characteristics while drilling, as shown in fig. 4, the device comprises:
the system comprises an obtaining module 401, a data acquisition module and a data processing module, wherein the obtaining module 401 is used for carrying out a digital drilling test on a rock mass to be evaluated by using digital drilling equipment provided with a core bit, and obtaining while-drilling parameters of the rock mass to be evaluated and response characteristics corresponding to the while-drilling parameters;
a determining module 402, configured to determine an integrity coefficient calculation formula of the rock mass to be evaluated according to the response characteristics corresponding to the while-drilling parameters of the rock mass to be evaluated, where the integrity coefficient calculation formula is as follows:
wherein RID is the integrity factor,Min order to be the torque, the torque is,Fin order to achieve the weight-on-bit,Has a result of the total drilling depth,L Mi for torque identificationiThe width of each of the cracks is,M a is the critical value of the torque, and the torque is,L Fi for weight on bit identificationiThe width of each of the cracks is,F b the bit pressure is a critical value of the bit pressure,nthe total number of the cracks is the total number of the cracks,i=1,2… n；
the evaluation module 403 is used for carrying out a digital drilling test on the underground engineering surrounding rock by using digital drilling equipment, and evaluating the integrity degree of the surrounding rock based on the integrity coefficient;
and the establishing module 404 is used for establishing a deterioration property while-drilling evaluation model according to the integrity coefficient, the deterioration coefficient and the equivalent strength of the rock mass to be evaluated, so as to realize the classification of the deterioration property of the surrounding rock.
As an optional implementation manner, the evaluation module 403 is specifically configured to:
if the integrity coefficient is larger than or equal to a first threshold value and smaller than or equal to a second threshold value, determining that the integrity degree of the surrounding rock to be evaluated is extremely broken surrounding rock;
if the integrity coefficient is larger than the second threshold and smaller than or equal to a third threshold, determining that the integrity degree of the surrounding rock to be evaluated is a medium-broken surrounding rock;
if the integrity coefficient is larger than the third threshold and smaller than or equal to a fourth threshold, determining that the integrity degree of the surrounding rock to be evaluated is relatively broken surrounding rock;
and if the integrity coefficient is larger than the fourth threshold and smaller than or equal to a fifth threshold, determining that the integrity degree of the surrounding rock of the rock mass to be evaluated is complete surrounding rock.
As an optional implementation manner, the establishing module 404 is specifically configured to:
determining the equivalent strength of the rock mass to be evaluated according to the while-drilling parameters;
and establishing a deterioration property while-drilling evaluation model of the rock mass to be evaluated according to the integrity coefficient, the deterioration coefficient and the equivalent strength of the rock mass to be evaluated.
As an optional implementation mode, the digital drilling equipment comprises a guide drilling system, a hydraulic servo system, a monitoring control system, a test auxiliary system and a core bit, and has two control and monitoring modes of drilling speed-rotating speed and drilling pressure-rotating speed, so that accurate control and real-time monitoring of drilling parameters in the drilling process of the underground engineering surrounding rock can be realized;
coring bit is the diamond compact drill bit, by inside the square diamond compact embedding annular matrix of multiunit, the cutting ring sword of formation.
The embodiment of the application provides a rock mass nature and degradation characteristic evaluation device while drilling, equip through the digital drilling and creep into the rock mass, survey the complete degree and the rock mass degradation intensity of country rock, need not take out the core from the rock mass, the integrality of rock mass has been protected, the expense of getting the core and transporting to the laboratory has been saved, also avoided when getting the core and transporting, the fracture that causes the rock mass, the error of rock mass degradation nature evaluation experimental result has been reduced, the degree of accuracy that detects has been improved.
Specific limitations of the device for evaluating the deterioration property of the rock mass while drilling can be seen in the above limitations of the method for evaluating the deterioration property of the rock mass while drilling, and are not described in detail herein. All or part of each module in the device for evaluating the rock mass degradation property while drilling can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, there is provided a computer apparatus, as shown in fig. 5, comprising a memory and a processor, the memory having stored thereon a computer program operable on the processor, the processor when executing the computer program performing the method steps of the above-described while drilling evaluation of a deterioration property of a rock mass.
In one embodiment, a computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the above method of while drilling evaluation of a deterioration property of a rock mass.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
It should be further noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for presentation, analyzed data, etc.) referred to in the present application are information and data authorized by the user or sufficiently authorized by each party.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for evaluating rock mass properties and deterioration characteristics while drilling, which is characterized by comprising the following steps:
carrying out a digital drilling test on a rock mass to be evaluated by using digital drilling equipment for assembling a core bit, and acquiring while-drilling parameters of the rock mass to be evaluated and response characteristics corresponding to the while-drilling parameters;
determining an integrity coefficient calculation formula of the rock mass to be evaluated according to the response characteristics corresponding to the while-drilling parameters of the rock mass to be evaluated, wherein the integrity coefficient calculation formula comprises the following steps:
wherein RID is the integrity factor,Min order to be the torque, the torque is,Fin order to realize the bit weight,Hin order to provide the total drilling depth,L Mi identified for torqueiThe width of each of the cracks is,M a is the critical value of the torque, and the torque is,L Fi for weight on bit identificationiThe width of each of the cracks is,F b the bit pressure is a critical value of the bit pressure,nthe total number of the cracks is the total number of the cracks,i=1,2… n；
carrying out a digital drilling test on the underground engineering surrounding rock by using digital drilling equipment, and evaluating the integrity degree of the surrounding rock based on the integrity coefficient;
and establishing a deterioration property while-drilling evaluation model according to the integrity coefficient, the deterioration coefficient and the equivalent strength of the rock mass to be evaluated, and realizing the classification of the deterioration property of the surrounding rock.
2. The method of claim 1, wherein the performing a digital drilling test of the underground engineered surrounding rock using digital drilling equipment, evaluating the integrity of the surrounding rock based on the integrity factor, comprises:
if the integrity coefficient is larger than or equal to a first threshold value and smaller than or equal to a second threshold value, determining that the integrity degree of the surrounding rock to be evaluated is extremely broken surrounding rock;
if the integrity coefficient is larger than the second threshold and smaller than or equal to a third threshold, determining that the integrity degree of the surrounding rock to be evaluated is a medium-broken surrounding rock;
if the integrity coefficient is larger than the third threshold and smaller than or equal to a fourth threshold, determining that the integrity degree of the surrounding rock to be evaluated is relatively broken surrounding rock;
and if the integrity coefficient is larger than the fourth threshold and smaller than or equal to a fifth threshold, determining that the integrity degree of the surrounding rock of the rock mass to be evaluated is complete surrounding rock.
3. The method according to claim 1, wherein the establishing of the deterioration property while drilling evaluation model of the rock mass to be evaluated according to the integrity coefficient, the deterioration coefficient and the equivalent strength of the rock mass to be evaluated to realize the classification of the deterioration property of the surrounding rock comprises the following steps:
determining the equivalent strength of the rock mass to be evaluated according to the while-drilling parameters;
and establishing a deterioration property while-drilling evaluation model according to the integrity coefficient, the deterioration coefficient and the equivalent strength of the rock mass to be evaluated, and realizing the classification of the deterioration property of the surrounding rock.
4. The method of claim 3, wherein the while drilling parameters of the rock mass comprise: drilling speed, rotational speed, weight on bit and torque; the equivalent strength formula of the rock mass to be evaluated is determined according to the while-drilling parameters and is as follows:
wherein,ECSin order to be of an equivalent strength,Nin order to set the rotational speed of the drill bit,Vin order to be the rate of penetration,Min order to achieve a drilling torque,Fin order to achieve the drilling pressure,Rin order to be the radius of the drill bit,L 1 、L 2 、L 3 for each row of cutting edge lengths,α、βin order to be a coefficient of fit,μis the coefficient of friction.
5. The method according to claim 3, wherein the formula for establishing the deterioration property while drilling evaluation model according to the integrity coefficient, the deterioration coefficient and the equivalent strength of the rock mass to be evaluated is as follows:
DCS=k v ×RID×ECS
wherein,DCSis the deterioration strength of the rock mass,k v to be a degradation coefficient, RID is an integrity coefficient,ECSis equivalent strength.
6. The method as claimed in claim 1, wherein the digital drilling equipment comprises a pilot drilling system, a hydraulic servo system, a monitoring control system, a test auxiliary system and a core bit, and has two control and monitoring modes of drilling speed-rotating speed and drilling pressure-rotating speed, so that accurate control and real-time monitoring of parameters while drilling in the drilling process of the underground engineering surrounding rock can be realized;
the coring bit is a diamond composite sheet bit, and a cutting annular blade is formed by embedding multiple groups of square diamond composite sheets into the annular tire body.
7. An apparatus for evaluating rock mass properties and deterioration characteristics while drilling, the apparatus comprising:
the device comprises an acquisition module, a data acquisition module and a data processing module, wherein the acquisition module is used for carrying out a digital drilling test on a rock mass to be evaluated by using digital drilling equipment provided with a core bit, and acquiring while-drilling parameters of the rock mass to be evaluated and response characteristics corresponding to the while-drilling parameters;
the determining module is used for determining an integrity coefficient calculation formula of the rock mass to be evaluated according to the response characteristics corresponding to the while-drilling parameters of the rock mass to be evaluated, and the integrity coefficient calculation formula comprises the following steps:
wherein RID is the integrity factor,m isThe torque is applied to the motor in a manner that,Fin order to achieve the weight-on-bit,His a main drillThe depth of the hole is increased to a depth,L Mi for torque identificationiThe width of each of the cracks is,M a is the critical value of the torque, and the torque is,L Fi for weight on bit identificationiThe width of each of the cracks is,F b the bit pressure is a critical value of the bit pressure,nthe total number of the cracks is the total number of the cracks,i=1,2… n；
the evaluation module is used for developing a digital drilling test of the surrounding rock of the underground engineering by using digital drilling equipment and evaluating the integrity degree of the surrounding rock based on the integrity coefficient;
and the establishing module is used for establishing a deterioration property while-drilling evaluation model according to the integrity coefficient, the deterioration coefficient and the equivalent strength of the rock mass to be evaluated so as to realize the classification of the deterioration property of the surrounding rock.
8. The apparatus according to claim 7, wherein the evaluation module is specifically configured to:
if the integrity coefficient is larger than or equal to a first threshold value and smaller than or equal to a second threshold value, determining that the integrity degree of the surrounding rock to be evaluated is extremely broken surrounding rock;
if the integrity coefficient is larger than the second threshold and smaller than or equal to a third threshold, determining that the integrity degree of the surrounding rock to be evaluated is a medium-broken surrounding rock;
if the integrity coefficient is larger than the third threshold and smaller than or equal to a fourth threshold, determining that the integrity degree of the surrounding rock to be evaluated is relatively broken surrounding rock;
and if the integrity coefficient is larger than the fourth threshold and smaller than or equal to a fifth threshold, determining that the integrity degree of the surrounding rock of the rock mass to be evaluated is complete surrounding rock.
9. The apparatus according to claim 7, wherein the establishing module is specifically configured to:
determining the equivalent strength of the rock mass to be evaluated according to the while-drilling parameters;
and establishing a degradation property while-drilling evaluation model according to the integrity coefficient, the degradation coefficient and the equivalent strength of the rock mass to be evaluated.
10. A computer device comprising a memory and a processor, the memory having stored thereon a computer program operable on the processor, wherein the processor, when executing the computer program, performs the steps of the method of any of claims 1 to 6.
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