CN112115537B - TBM (Tunnel boring machine) digability grading method - Google Patents
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Abstract
The invention discloses a TBM (Tunnel boring machine) digability grading method, which comprises the following steps: collecting historical tunneling data, including total thrust, cutter torque and penetration; calculating rock mass digability indexes and rock mass machinability indexes; drawing a tunneling performance distribution diagram, and acquiring a fitting linear equation according to the tunneling performance distribution diagram; drawing a tunneling limited area diagram according to a fitting linear equation and a tunneling data limited curve, and marking a torque limited point and a penetration limited point according to the tunneling limited area diagram; acquiring new tunneling data on line, and calculating rock mass digability indexes and rock mass machinability indexes of the new tunneling data; and calculating a fitted rock mass drivability index according to the rock mass drivability index and the rock mass machinability index of the new tunneling data, and comparing the rock mass drivability index of the new tunneling data or the fitted rock mass drivability index with the torque limited point and the penetration limited point to judge the tunneling state. The invention has simple calculation and rapid judgment.
Description
Technical Field
The invention belongs to the technical field of tunnel engineering tunnel boring machine construction, and particularly relates to a TBM (Tunnel boring machine) drivability grading method based on tunneling limited mode identification.
Background
The tunnel boring machine construction has the advantages of safety, high efficiency, environmental protection and the like, and has become the first choice method for long and large tunnel construction. The TBM has the most remarkable characteristics of high tunneling speed and integration of tunneling and supporting. The engineering rock mass condition under the TBM method is evaluated, and the "digability" of the stratum is emphasized, so that the construction characteristics of the TBM cannot be properly matched by the traditional surrounding rock classification method, and the applicability of the TBM cannot be evaluated.
The specific surrounding rock grading method aiming at TBM has attracted attention of researchers, wherein some models directly use construction speed to grade rock, and other models still use comprehensive multiple rock parameters to weight and evaluate rock grades, and the methods can be used for evaluating TBM rock grading, but the problems of too many parameters, difficult acquisition, inconvenient and inaccurate model use and the like exist.
Disclosure of Invention
Aiming at the problems of excessive parameters and inaccurate judgment of the existing rock mass grading judgment method, the invention provides a TBM (Tunnel boring machine) digability grading method, and the digability of the current tunneling stratum can be judged according to tunneling data acquired in real time.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a TBM (Tunnel boring machine) portability grading method comprises the following steps:
s1, collecting historical tunneling data reflecting the running state of TBM equipment, wherein the historical tunneling data comprises total thrust, cutter torque and penetration;
s2, calculating a rock mass digability index and a rock mass machinability index according to the historical tunneling data acquired in the step S1;
s3, drawing a tunneling performance distribution diagram according to the rock mass digability index and the rock mass machinability index calculated in the step S2, and acquiring a fitting linear equation according to the tunneling performance distribution diagram;
s4, drawing a tunneling limited area diagram according to the fitted linear equation and the tunneling data limited curve in the step S3, and obtaining a torque limited point FPI according to the tunneling limited area diagram T-limited And penetration limit point FPI p-limited ；
S5, acquiring new tunneling data on line, and calculating rock mass digability indexes and rock mass machinability indexes corresponding to the new tunneling data;
s6, calculating a fitted rock mass digability index FPI according to the rock mass digability index and the rock mass machinability index corresponding to the new tunneling data pro Through the rock mass digability index corresponding to the new tunneling data or the fitted rock mass digability index FPI pro With torque limiting point FPI T-limited And penetration limit point FPI p-limited And comparing to judge the tunneling limited mode of the TBM.
In step S2, the rock mass digability index FPI is calculated according to the historical tunneling data 0.5 And a rock mass machinability index TPI, comprising the steps of:
s2.1, grouping the historical tunneling data acquired in the step S1, and respectively calculating the average value of each tunneling parameter in each group of historical tunneling data;
s2.2, calculating a rock mass digability index FPI of each group of historical tunneling data according to the average value of the tunneling parameters obtained in the step S2.1 0.5 And a rock mass machinability index TPI.
Rock mass digability index FPI of each group of historical tunneling data 0.5 The calculation formula of (2) is as follows:
wherein F represents the total thrust average; f (F) f The friction force of air pushing is represented, n represents the total number of hob, and p represents the mean value of penetration; the calculation formula of the rock mass machinability index TPI of each group of historical tunneling data is as follows:
wherein T represents the torque average value of the cutterhead, R represents the diameter of the cutterhead, T s Indicating the idle torque of the cutterhead.
In step S3, the abscissa of the tunneling performance distribution diagram is the rock mass machinability index TPI, and the ordinate is the rock mass workability index FPI 0.5 The method for acquiring the fitting linear equation according to the tunneling performance distribution diagram is a least square method, and the formula of the fitting linear equation is as follows:
in the method, in the process of the invention,and->All represent fitting coefficients, the variable x represents a rock mass machinability index TPI corresponding to the historical tunneling data, and the variable y represents a rock mass portability index FPI corresponding to the historical tunneling data 0.5 ；
The fitting coefficientAnd fitting coefficient->The calculation formulas of (a) are respectively as follows:
in (x) i ，y i ) Respectively representing a rock mass machinability index TPI and a rock mass digability index FPI corresponding to the i-th group of historical tunneling data 0.5 ，Representing the mean value of the rock mass machinability index calculated from the rock mass machinability index TPI of each set of historical driving data +.>Rock mass digability index FPI representing tunneling data according to each group of historic tunneling data 0.5 And j represents the group number of the historical tunneling data.
In step S4, the tunneling data limited curve includes a penetration limited curve, a thrust limited curve, and a torque limited curve, and the drawing of the tunneling limited area graph includes the following steps:
s4.1, drawing an abscissa and an ordinate of the tunneling limited area diagram, wherein the abscissa is the penetration P, and the ordinate is corresponding to each tunneling dataRock mass digability index FPI' 0.5 ；
S4.2, respectively drawing a penetration limit curve, a thrust limit curve and a torque limit curve according to a penetration limit curve formula, a thrust limit curve formula and a torque limit curve formula in the tunneling limit area diagram;
s4.3, the intersection point of the torque limiting curve and the thrust limiting curve is the torque limiting point FPI T-limited The intersection point of the torque-limited curve and the penetration-limited curve is the penetration-limited point FPI p-limited 。
The formula corresponding to the penetration limit curve is as follows:
P＝p lim ；
wherein p is lim Represents the penetration limit value, the penetration limit value p lim The construction project group gives the construction project group according to the design capacity of TBM equipment and the field test tunneling;
the formula corresponding to the torque limiting curve is as follows:
in the method, in the process of the invention,and->All represent fitting coefficients, n represents the total number of the hob, R represents the diameter of a cutterhead and T s Indicating idle torque of cutterhead, T lim Representing a cutter torque limit value, a cutter torque limit value T lim The construction project group gives the construction project group according to the design capacity of TBM equipment and the field test tunneling;
the formula corresponding to the thrust limit curve is as follows:
wherein F is f Representing air pushingFriction force F lim Representing a total thrust limit value, a total thrust limit value F lim The construction project group gives the construction project group according to the design capacity of TBM equipment and the field test tunneling.
In step S6, the fitted rock mass excavability index FPI is calculated according to the rock mass excavability index and the rock mass machinability index corresponding to the new tunneling data pro Through the rock mass digability index corresponding to the new tunneling data or the fitted rock mass digability index FPI pro With torque limiting point FPI T-limited And penetration limit point FPI p-limited The comparison is carried out to judge the tunneling limited mode of the TBM, and the method comprises the following steps:
s6.1, marking rock mass digability indexes and rock mass machinability indexes corresponding to new tunneling data in a tunneling performance distribution diagram, and projecting the points to a fitting straight line;
s6.2, calculating the ordinate of the projection point according to the rock mass digability index and the rock mass machinability index corresponding to the fitting straight line equation and the new tunneling data, namely obtaining the fitted rock mass digability index FPI pro ；
S6.3, if the rock mass digability index FPI corresponding to the new tunneling data is obtained 0.5 With torque limiting point FPI T-limited Penetration limit point FPI p-limited Comparison is performed:
when FPI 0.5 >FPI T-limited When the current TBM tunneling state is in the thrust limited mode, when the FPI 0.5 <＝FPI T-limited And FPI 0.5 >FPI p-limited When the current TBM tunneling state is in the torque limited mode, when the FPI 0.5 <＝FPI p-limited When the current TBM tunneling state is in a penetration limited mode;
if the rock mass digability index FPI to be fitted pro With torque limiting point FPI T-limited Penetration limit point FPI p-limited Comparison is performed:
when FPI pro >FPI T-limited When the current TBM tunneling state is in a thrust limited mode; when FPI pro <＝FPI T-limited And FPI pro >FPI p-limited When the current TBM tunneling state is in a torque limited mode; when FPI pro <＝FPI p-limited When the current TBM tunneling state is in the penetration limited mode.
The fitted rock mass digability index FPI pro The calculation formula of (2) is as follows:
in the method, in the process of the invention,and->Each representing a fitting coefficient to fit the linear equation.
The invention has the beneficial effects that:
the invention uses the rock mass digability index FPI 0.5 Or fitted rock mass digability index FPI pro And torque limiting point FPI T-limited And penetration limit point FPI p-limited The tunneling limited mode of the current TBM can be judged in real time by comparison, the tunneling property of the current tunneling stratum and the state of the current rock mass are judged according to the tunneling limited mode, and a reference is provided for TBM operators to set TBM operation parameters; the method has the advantages of simple calculation, rapid judgment and less parameter use, and ensures the safety of TBM tunneling construction.
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In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of the present invention.
Fig. 2 is a tunneling performance profile.
Fig. 3 is a diagram of a tunneling limited area.
Fig. 4 is a schematic diagram of a projection relationship between a coordinate point corresponding to the known new tunneling data and a straight line.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without any inventive effort, are intended to be within the scope of the invention.
A TBM (Tunnel boring machine) portability grading method is shown in fig. 1, and comprises the following steps:
s1, TBM historical tunneling data reflecting the running state of TBM equipment are collected, and the historical tunneling data comprise total thrust, cutter torque and penetration.
S2, calculating a rock mass digability index FPI according to the historical tunneling data in the step S1 0.5 And a rock mass machinability index TPI, comprising the steps of:
s2.1, grouping the historical tunneling data acquired in the step S1, and respectively calculating the average value of each tunneling parameter in each group of historical tunneling data: the average value of each tunneling parameter is respectively a total thrust average value, a cutter head torque average value and a penetration average value;
in actual operation, the tunneling data may be grouped according to tunneling cycles, each group of tunneling data may include tunneling data of a plurality of tunneling cycles, and one tunneling cycle represents one tunneling.
S2.2, calculating a rock mass digability index FPI of each group of historical tunneling data according to the average value of the tunneling parameters obtained in the step S2.1 0.5 And a rock mass machinability index TPI;
rock mass digability index FPI of each group of historical tunneling data 0.5 The calculation formula of (2) is as follows:
wherein F represents the total thrust average; f (F) f The air pushing friction force is represented, n represents the total number of hob, and p represents the penetration mean value.
The calculation formula of the rock mass machinability index TPI of each group of historical tunneling data is as follows:
wherein T represents the torque average value of the cutterhead, R represents the diameter of the cutterhead, T s Indicating the idle torque of the cutterhead.
S3, rock mass digability index FPI of each group of historical tunneling data calculated in the step S2 0.5 Drawing a tunneling performance distribution diagram together with a rock mass machinability index (TPI), and adopting a least square method to map the rock mass machinability index (FPI) 0.5 Fitting the linear relation between the rock mass machinability index TPI, obtaining a fitting linear equation, and drawing a fitting straight line in a tunneling performance distribution diagram;
the horizontal coordinate of the tunneling performance distribution diagram is a rock mass machinability index (TPI), and the vertical coordinate is a rock mass routability index (FPI) 0.5 The fitting straight line equation represents the rock mass machinability index TPI and the rock mass digability index FPI 0.5 The linear relation between the two, and the formula of the fitting straight line equation is:
in the method, in the process of the invention,and->All represent fitting coefficients, the variable x represents a rock mass machinability index TPI, and the variable y represents a corresponding rock mass digability index FPI 0.5 ；
Fitting coefficientAnd fitting coefficient->The calculation formulas of (a) are respectively as follows:
in (x) i ，y i ) Respectively representing a rock mass machinability index TPI and a rock mass digability index FPI corresponding to the i-th tunneling data 0.5 ，Representing the mean value of the rock mass machinability index calculated from the rock mass machinability index TPI of each set of historical driving data +.>Rock mass digability index FPI representing tunneling data according to each group of historic tunneling data 0.5 And j represents the group number of tunneling data.
As shown in FIG. 2, the fitted straight line equation of the present embodiment is FPI 0.5 ＝29.44TPI-8.83。
S4, drawing a tunneling limited area diagram according to the fitted linear equation and the tunneling data limited curve in the step S3, and acquiring a torque limited point FPI according to the tunneling limited area diagram T-limited And penetration limit point FPI p-limited ；
The tunneling data limited curve comprises a penetration limited curve, a thrust limited curve and a torque limited curve, and comprises the following steps:
s4.1, drawing an abscissa and an ordinate of the tunneling limited area diagram, wherein the abscissa is the penetration P, and the ordinate is a rock mass tunneling index FPI 'corresponding to each tunneling data' 0.5 。
S4.2, as shown in FIG. 3, in the tunneling limited area graph, respectively drawing a penetration limited curve, a thrust limited curve and a torque limited curve according to a penetration limited curve formula, a thrust limited curve formula and a torque limited curve formula;
the formula of the penetration limit curve is as follows:
P＝p lim ；
wherein P represents penetration, P lim Represents the penetration limit value, the penetration limit value p lim The construction project group gives the construction project group according to the design capacity of TBM equipment and the field test tunneling;
the formula of the torque limiting curve is obtained according to a fit straight line equation and a calculation formula of a rock mass machinability index TPI, and the formula of the torque limiting curve is as follows:
wherein T is lim Representing a cutter torque limit value, a cutter torque limit value T lim The construction project group gives out FPI 'according to the design capacity of TBM equipment and the field test tunneling' 0.5 And (5) representing the rock mass digability index corresponding to each piece of tunneling data.
The formula of the thrust limit curve is as follows:
wherein F is lim Representing a total thrust limit value, a total thrust limit value F lim The construction project group gives the construction project group according to the design capacity of TBM equipment and the field test tunneling.
S4.3, the intersection point of the torque limiting curve and the thrust limiting curve is the torque limiting point FPI T-limited The intersection point of the torque-limited curve and the penetration-limited curve is the penetration-limited point FPI p-limited ；
In the present embodiment, the penetration limit p lim 20, torque limiting Point FPI T-limited Penetration limit point FPI p-limited 87.05 and 28.51, respectively.
S5, acquiring new tunneling data on line through a sensor, and calculating a rock mass digability index FPI corresponding to the new tunneling data according to a formula in the step S2 0.5 And a rock mass machinability index TPI;
the new tunneling data includes total thrust, cutterhead torque and penetration.
S6, calculating a fitted rock mass digability index FPI according to the rock mass digability index and the rock mass machinability index corresponding to the new tunneling data pro Through the rock mass digability index corresponding to the new tunneling data or the fitted rock mass digability index FPI pro With torque limiting point FPI T-limited And penetration limit point FPI p-limited Judging the tunneling limited mode of the TBM by comparing, judging the tunneling property of the current tunneling stratum according to the tunneling limited mode, and comprising the following steps:
s6.1, the rock mass digability index FPI corresponding to the new tunneling data is processed 0.5 And a rock mass machinability index TPI is marked in the drivage performance profile and the point is projected towards a fitted straight line.
S6.2, according to the rock mass digability index FPI corresponding to the new tunneling data 0.5 Calculating the ordinate of the projection point by using the rock mass machinability index TPI and the fitting linear equation, namely the fitted rock mass machinability index FPI pro ；
As shown in fig. 4, the coordinates of the P point are (x 1 ,y 1 ) The coordinate value is known that the straight line is y=kx+b, and the slope and intercept of the straight line are known. If the P point is projected to a straight line, the projected point is Q, and its coordinates are (x 0 ,y 0 ) Thus PQ is perpendicular to a straight line and Q is located on the straight line, the coordinates of Q can be solved by:
as can be obtained from the above-mentioned,
according to the principle, the fitted rock mass digability index FPI pro The calculation formula of (2) is as follows:
s6.3, if the rock mass digability index FPI corresponding to the new tunneling data is obtained 0.5 With torque limiting point FPI T-limited Penetration limit point FPI p-limited Comparison is performed:
when FPI 0.5 >FPI T-limited When the current TBM tunneling state is in a thrust limited mode, corresponding to a harder rock mass; when FPI 0.5 <＝FPI T-limited And FPI 0.5 >FPI p-limited When the current TBM tunneling state is in a torque limited mode, corresponding to a rock mass with medium hardness; when FPI 0.5 <＝FPI p-limited When the current TBM tunneling state is in a penetration limited mode, the current TBM tunneling state corresponds to a weaker or broken rock mass;
if the rock mass digability index FPI to be fitted pro With torque limiting point FPI T-limited Penetration limit point FPI p-limited Comparison is performed:
when FPI pro >FPI T-limited When the tunneling state of the current TBM is in a thrust limited mode, the tunneling state corresponds to a harder rock mass; when FPI pro <＝FPI T-limited And FPI pro >FPI p-limited When the current TBM tunneling state is in a torque limited mode, corresponding to a rock mass with medium hardness degree; when FPI pro <＝FPI p-limited When the current TBM tunneling state is in a penetration limited mode, corresponding to a weaker or crushed rock mass.
Rock mass digability index FPI using fitting pro The comparison can comprehensively consider the rock mass digger index FPI 0.5 And the influence of the rock mass machinability index TPI, so that the judgment result of the tunneling mode is more accurate.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (8)
1. The TBM digability grading method is characterized by comprising the following steps:
s1, collecting historical tunneling data reflecting the running state of TBM equipment, wherein the historical tunneling data comprises total thrust, cutter torque and penetration;
s2, calculating a rock mass digability index and a rock mass machinability index according to the historical tunneling data acquired in the step S1;
s3, drawing a tunneling performance distribution diagram according to the rock mass digability index and the rock mass machinability index calculated in the step S2, and acquiring a fitting linear equation according to the tunneling performance distribution diagram;
s4, drawing a tunneling limited area diagram according to the fitted linear equation and the tunneling data limited curve in the step S3, and obtaining a torque limited point FPI according to the tunneling limited area diagram T-limited And penetration limit point FPI p-limited ；
S5, acquiring new tunneling data on line, and calculating rock mass digability indexes and rock mass machinability indexes corresponding to the new tunneling data;
s6, calculating a fitted rock mass digability index FPI according to the rock mass digability index and the rock mass machinability index corresponding to the new tunneling data pro Through the rock mass digability index corresponding to the new tunneling data or the fitted rock mass digability index FPI pro With torque limiting point FPI T-limited And penetration limit point FPI p-limited And comparing to judge the tunneling limited mode of the TBM.
2. The TBM drivability grading method according to claim 1, characterized in that in step S2, the rock mass drivability index FPI is calculated from historical drivage data 0.5 And rock mass machinability index TPI comprising the followingThe steps are as follows:
s2.1, grouping the historical tunneling data acquired in the step S1, and respectively calculating the average value of each tunneling parameter in each group of historical tunneling data;
s2.2, calculating a rock mass digability index FPI of each group of historical tunneling data according to the average value of the tunneling parameters obtained in the step S2.1 0.5 And a rock mass machinability index TPI.
3. A method of grading TBM drivability according to claim 2 characterised in that the rock drivability index FPI for each set of historical drivability data 0.5 The calculation formula of (2) is as follows:
wherein F represents the total thrust average; f (F) f The friction force of air pushing is represented, n represents the total number of hob, and p represents the mean value of penetration;
the calculation formula of the rock mass machinability index TPI of each group of historical tunneling data is as follows:
wherein T represents the torque average value of the cutterhead, R represents the diameter of the cutterhead, T s Indicating the idle torque of the cutterhead.
4. A TBM drivability grading method according to claim 3 characterised in that in step S3 the drivability profile has an abscissa of the rock mass machinability index TPI and an ordinate of the rock mass drivability index FPI 0.5 The method for acquiring the fitting linear equation according to the tunneling performance distribution diagram is a least square method, and the formula of the fitting linear equation is as follows:
in the method, in the process of the invention,and->All represent fitting coefficients, the variable x represents a rock mass machinability index TPI corresponding to the historical tunneling data, and the variable y represents a rock mass portability index FPI corresponding to the historical tunneling data 0.5 ；
The fitting coefficientAnd fitting coefficient->The calculation formulas of (a) are respectively as follows:
in (x) i ，y i ) Respectively representing a rock mass machinability index TPI and a rock mass digability index FPI corresponding to the i-th group of historical tunneling data 0.5 ，Representing the mean value of the rock mass machinability index calculated from the rock mass machinability index TPI of each set of historical driving data +.>Rock mass digability index FPI representing tunneling data according to each group of historic tunneling data 0.5 And j represents the group number of the historical tunneling data.
5. The TBM drivability grading method according to claim 1 or 4, characterized in that in step S4, the tunneling data limited curve includes a penetration limited curve, a thrust limited curve, and a torque limited curve, and the method of drawing a tunneling limited area map includes the steps of:
s4.1, drawing an abscissa and an ordinate of the tunneling limited area diagram, wherein the abscissa is the penetration P, and the ordinate is a rock mass tunneling index FPI 'corresponding to each tunneling data' 0.5 ；
S4.2, respectively drawing a penetration limit curve, a thrust limit curve and a torque limit curve according to a penetration limit curve formula, a thrust limit curve formula and a torque limit curve formula in the tunneling limit area diagram;
s4.3, the intersection point of the torque limiting curve and the thrust limiting curve is the torque limiting point FPI T-limited The intersection point of the torque-limited curve and the penetration-limited curve is the penetration-limited point FPI p-limited 。
6. The TBM workability classification method as claimed in claim 5, wherein the formula corresponding to the penetration limit curve is:
P＝p lim ；
wherein p is lim Representing a penetration limit;
the formula corresponding to the torque limiting curve is as follows:
in the method, in the process of the invention,and->All represent fitting coefficients, n represents the total number of the hob, R represents the diameter of a cutterhead and T s Indicating idle torque of cutterhead, T lim Representing a cutter torque limit value;
the formula corresponding to the thrust limit curve is as follows:
wherein F is f Represents the air pushing friction force, F lim Indicating a total thrust limit.
7. A TBM drivability grading method according to claim 1 or 6 characterized in that in step S6, the fitted rock drivability index FPI is calculated from the rock drivability index and the rock machinability index corresponding to the new drivage data pro Through the rock mass digability index corresponding to the new tunneling data or the fitted rock mass digability index FPI pro With torque limiting point FPI T-limited And penetration limit point FPI p-limited The comparison is carried out to judge the tunneling limited mode of the TBM, and the method comprises the following steps:
s6.1, marking rock mass digability indexes and rock mass machinability indexes corresponding to new tunneling data in a tunneling performance distribution diagram, and projecting the points to a fitting straight line;
s6.2, calculating the ordinate of the projection point according to the rock mass digability index and the rock mass machinability index corresponding to the fitting straight line equation and the new tunneling data, namely obtaining the fitted rock mass digability index FPI pro ；
S6.3, if the rock mass digability index FPI corresponding to the new tunneling data is obtained 0.5 With torque limiting point FPI T-limited Penetration limit point FPI p-limited Comparison is performed:
when FPI 0.5 >FPI T-limited When the current TBM tunneling state is in the thrust limited mode, when the FPI 0.5 <＝FPI T-limited And FPI 0.5 >FPI p-limited When the current TBM tunneling state is in the torque limited mode, when the FPI 0.5 <＝FPI p-limited When the current TBM tunneling state is in a penetration limited mode;
if the rock mass digability index FPI to be fitted pro And turn roundMoment limited point FPI T-limited Penetration limit point FPI p-limited Comparison is performed:
when FPI pro >FPI T-limited When the current TBM tunneling state is in a thrust limited mode; when FPI pro <＝FPI T-limited And FPI pro >FPI p-limited When the current TBM tunneling state is in a torque limited mode; when FPI pro <＝FPI p-limited When the current TBM tunneling state is in the penetration limited mode.
8. The TBM drivability grading method of claim 7 wherein the fitted rock mass drivability index FPI pro The calculation formula of (2) is as follows:
in the method, in the process of the invention,and->Each representing a fitting coefficient to fit the linear equation.
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| CN112598061B (en) * | 2020-12-23 | 2023-05-26 | 中铁工程装备集团有限公司 | Clustering and grading method for tunnel surrounding rock |
| CN115438402A (en) * | 2022-08-22 | 2022-12-06 | 武汉大学 | Real-time TBM tunneling rock mass condition prediction method and device based on rock-machine mutual feedback perception relation |
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