JP2004279272A - Method and system for evaluating physical property of bedrock, program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently acquire an evaluation result of excellent precision. <P>SOLUTION: This method/system for evaluation comprises processes for: executing an original position test and elastic wave velocity measurement for other peripheral bedrock to acquire a modulus value of deformation and an elastic wave velocity; drawing out a multiple regression correlation expression based on the modulus value of deformation, the elastic wave velocity and geological property information of the other peripheral bedrock; applying geological property information of an evaluating bedrock to the multiple regression correlation expression to estimate a modulus value of deformation in the evaluating bedrock; executing the elastic wave velocity measurement only for one measuring line in the evaluating bedrock to acquire the modulus value of deformation in the evaluating bedrock; recognizing strength or a change thereof in the evaluating bedrock based on the elastic wave velocity of the evaluating bedrock, and collating it with a prescribed determination reference to determine the necessity of individual investigation for a modulus of deformation; and determining the estimated modulus value of deformation as the modulus value of deformation in the evaluating bedrock, when the individual investigation is determined to be unnecessary. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rock physical property evaluation method and system, a program, and a recording medium.
[0002]
[Prior art]
In the design of lining such as iron pipes and concrete, it is necessary to appropriately grasp the properties of the rock mass (synthetic deformation coefficient). Therefore, in order to accurately grasp the physical properties of the rock, it is required to conduct a flat plate loading test in detail. However, it is not realistic in terms of workability and economics to carry out the test for all rocks whose physical property values change in a complicated manner in the construction area. In particular, it is extremely difficult to carry out tests on the shaft shaft area in view of the test environment.Therefore, it is necessary to conduct several tests on rocks with almost the same geological conditions as the rocks to be constructed. It has been common practice to measure elastic wave velocities over a period of time. In this case, the results of the plate loading test and the results of the elastic wave velocity measurement are correlated and complemented to evaluate the rock properties in the construction area. In addition, a process of qualitatively incorporating the result of the geological survey over the entire line into the correlation has been performed (see Patent Documents 1 and 2).
[0003]
[Non-patent document 1]
Water gate iron tube No. 154 (19888.3) Suimon Iron Pipe Association
[Non-patent document 2]
Water gate iron tube No. 196 (1989. 9) Suimon Iron Pipe Association
[Problems to be solved by the invention]
However, a problem remains in the conventional method. That is, the flat plate loading test is a problem caused by the need to fix the test machine horizontally, apply a load to the test plate, and measure the tendency of change between the load and the displacement. Due to the characteristics of the test method, the installation condition of the test machine has a great influence on the accuracy of the test result. For example, in a test environment such as a shaft or a shaft, the installation surface of the test machine is not originally a horizontal surface, and the work area is a narrow area with a limited working area.
[0006]
For this reason, it is difficult to secure a space for arranging necessary materials and the like, and it is necessary to provide special equipment for carrying in and transporting the materials and the like. Therefore, installation of the test machine itself becomes difficult. Of course, the workability of the workers in the inclined shaft or the like is not good, and there is still a problem in terms of work efficiency.
[0007]
Furthermore, in addition to the difficulty in setting up the test machine, there is a concern that the test results obtained in a difficult test environment may not be accurate and good. In particular, when the geological characteristics of the rock to be evaluated change in a complicated manner, it is not feasible in terms of efficiency to perform a rock sample evaluation by taking sample rocks for the test in detail, but the rock is sampled at only a few locations. It was difficult to reliably evaluate the entire evaluation rock mass. On the other hand, if it takes time to evaluate the rock mass by adopting the conventional method, it may lead to a decrease in the excavation efficiency of tunnels and the like, which may affect the progress of this construction.
[0008]
Therefore, the present invention has been made in view of such problems, and an object of the present invention is to provide a rock physical property evaluation method and system, a program, and a recording medium that enable efficient acquisition of good precision evaluation results. .
[0009]
[Means for Solving the Problems]
The rock physical property evaluation method of the present invention that achieves the above object is a method for evaluating rock physical properties, and performs an in-situ test and an elastic wave velocity measurement on other surrounding rocks having substantially the same geological properties as the evaluation rock. Executing the step of acquiring a deformation coefficient value and an elastic wave velocity, and performing a multiple regression analysis based on the acquired deformation coefficient value and elastic wave velocity, and the geological property information of the surrounding rock mass, A step of deriving a multiple regression correlation equation relating to the information and the deformation coefficient, a step of applying the geological property information of the evaluation rock to the multiple regression correlation equation, and estimating a deformation coefficient value of the evaluation rock, Performing an elastic wave velocity measurement on only the rock mass to obtain an elastic wave velocity of the evaluation rock mass;
A step of recognizing the strength of the evaluation rock mass or its change based on the elastic wave velocity of the evaluation rock mass, collating it with a predetermined criterion to determine whether or not individual examination of the deformation coefficient is required; and And determining the estimated deformation coefficient value as the deformation coefficient value of the evaluation rock mass when it is determined that is not necessary.
[0010]
According to a second aspect of the present invention, in the first aspect, when it is determined by the determination that the individual study is necessary, a finite element method analysis is performed on the individual study portion to newly calculate a deformation coefficient value. It is characterized by.
[0011]
A third invention is characterized in that, in the first or second invention, the evaluation rock is a slope shaft or a vertical shaft, and other surrounding rocks are horizontal shafts.
[0012]
In a fourth aspect based on any one of the first to third aspects, the geological property information includes at least one of a rock type distribution ratio, a hardness class, a crack interval, a crack class, and a spring water amount. Features.
[0013]
According to a fifth aspect of the present invention, in any one of the first to fourth aspects, when the geological properties of the evaluation rock mass or the surrounding rock mass change over time or over time, the item of the geological property information to be used is changed to the geological characteristics at the change point. It is characterized in that it is selectively used correspondingly.
[0014]
The sixth invention is a system for evaluating the properties of a rock mass, which performs an in-situ test and an elastic wave velocity measurement on other surrounding rock masses having substantially the same geological properties as the evaluated rock mass to obtain a deformation coefficient value and Means for acquiring an elastic wave velocity, performing a multiple regression analysis based on the acquired deformation coefficient value and elastic wave velocity and the geological property information of the surrounding rock mass, and performing multiple regression analysis on the geological property information and the deformation coefficient. A means for deriving a correlation equation, a means for applying the geological property information of the evaluation rock to the multiple regression correlation equation to estimate a deformation coefficient value of the evaluation rock, and an elastic wave velocity measurement for only one measurement line in the evaluation rock Means for obtaining the elastic wave velocity of the evaluation rock mass, and recognizing the strength or the change of the evaluation rock mass based on the elastic wave speed of the evaluation rock mass, collating this with a predetermined criterion, and individually examining the deformation coefficient. Necessity And a means for setting the estimated deformation coefficient value as the deformation coefficient value of the evaluation rock mass when it is determined that individual examination is not required by the judgment, It takes
[0015]
A seventh invention is a program for causing a computer to execute a method of evaluating physical properties of a rock, and executes an in-situ test and an elastic wave velocity measurement on other surrounding rocks having substantially the same geological properties as the evaluated rock. Obtained, the step of acquiring the deformation coefficient value and the elastic wave velocity, and performing the multiple regression analysis based on the acquired deformation coefficient value and the elastic wave velocity and the geological property information of the surrounding other rocks, A step of deriving a multiple regression correlation equation relating to property information and a deformation coefficient; a step of applying the geological property information of the evaluation rock mass to the multiple regression correlation equation to estimate a deformation coefficient value of the evaluation rock mass; The step of acquiring the elastic wave velocity of the evaluation rock obtained by executing the elastic wave velocity measurement only for the survey line, and recognizing the strength or the change of the evaluation rock based on the elastic wave velocity of the evaluation rock, A step of determining whether or not individual examination of the deformation coefficient is necessary by collating with a predetermined judgment criterion, and, if it is determined that individual examination is not necessary, the estimated deformation coefficient value And a rock mass property evaluation program. This program is composed of codes for performing the operations of the above steps.
[0016]
An eighth invention relates to a computer-readable recording medium recording the rock physical property evaluation program according to the seventh invention.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing an example of the structure of a hydraulic pipe inclined shaft. The inclined shaft for hydraulic pipeline shown in the figure is installed as a route for transmitting the water stored in the dam toward the turbine of the power plant, and the rock around the inclined shaft is an example to which the rock physical property evaluation method of the present invention is applied. Become. In constructing this inclined shaft, rock excavation is performed by excavating a tunnel boring machine from the power plant side toward the dam embankment. The hydraulic penstock laid in such a hydraulic conduit is made as thin as possible by substantially equilibrating the pressure from the surrounding rock and the water pressure passing through the inside of the steel pipe. Therefore, it is necessary to grasp the rock pressure and geological properties in detail and surely.
[0018]
FIG. 2A is a diagram showing a test situation of a flat plate loading test, and FIG. 2B is a diagram showing an outline of an elastic wave velocity measurement. The flat plate loading test is an in-situ test in which a load is applied to a rock surface through a flat loading plate, and the bearing capacity and deformation characteristics of the rock are determined from the relationship between the load strength and the amount of settlement of the loaded plate. More specifically, as shown in the figure, a steel plate having a diameter of about 30 cm to 60 cm is placed on the rock, and a load of, for example, about 10 Mpa is executed by a jack. By measuring the deformation characteristics, etc., it becomes possible to grasp the strain distribution and the like of the heterogeneous rock. Elastic wave velocity measurement is performed by generating an elastic wave at the transmitting point on the rock to be evaluated and propagating through the rock, capturing it at the receiving point, and analyzing the velocity distribution to determine the strength of the rock. It is a technique that can estimate. (B) As shown in the figure, if the elastic wave velocity is high, it is determined that the rock strength is high, while if the elastic wave velocity is low, it is determined that the rock strength is low.
[0019]
In the present invention, which solves the above-mentioned difficulty in carrying out the flat plate loading test and the like in a steep inclined shaft (or vertical shaft) as described above, the in-situ test in the inclined shaft is reduced as much as possible, and observation information of geological properties is obtained. Is to be used effectively. FIG. 3 shows an example of a system configuration for realizing such a rock physical property evaluation method of the present invention. In this example of the system configuration, information processed by the hardware and a processing flow thereof are outlined in addition to the hardware configuration.
[0020]
The hardware constituting the system 100 mainly includes an information input terminal 101 such as a PDA and an information processing terminal 102 such as a personal computer connected to the information input terminal 101 via a network. Of course, both may operate integrally as an input interface and an information processing device. Further, the information processing terminal 102 includes a preceding test / geological observation result database 103 and a geological database 104.
[0021]
The system 100 according to the present invention is assumed to have a configuration including the PDA 101 and the personal computer 102 as an example, but is not limited thereto. The system can be arbitrarily configured as long as it is a combination of the information input terminal 101 which is easy to use at the original position where a flat plate loading test is performed and the information processing terminal 102 which has a function capable of processing such as analysis. In addition, the information input terminal 101 or the information processing terminal 102 stores a program for realizing the rock property evaluation method of the present invention in an appropriate storage device such as a program database, and the arithmetic device or the like stores the program in an operating system (OS). The rock physical property evaluation method is executed by, for example, appropriately reading out the information into a memory.
[0022]
Further, the PDA 101 and the personal computer 102 include, as computers, an I / O for executing data communication with each other, an output interface such as a display for outputting information, and an input interface for receiving selection and instructions from a user.
[0023]
It should be noted that the databases 103 and 104 are not limited to the example provided integrally with the personal computer 102, but may be operated integrally via a network while being attached to another device. As for the network connecting the PDA 101 and the personal computer 102, various networks such as a WAN (Wide Area Network), a LAN, a power line network, a wireless network, a public line network, and a mobile phone network are used in addition to a dedicated line and the Internet. Can also be adopted. Further, if a virtual private network technology such as VPN is used, communication with enhanced security is established when the Internet is adopted, which is preferable.
[0024]
Therefore, a procedure for executing the rock physical property evaluation method of the present invention using the system 100 as described above will be described. First, an outline of the processing will be described with reference to FIG. FIG. 4 is a diagram showing a main flow of the rock physical property evaluation method. It is assumed that the flow described here is performed by either the information input terminal 101 or the information processing terminal 102, or by both working together.
[0025]
The system 100 performs the above-mentioned flat plate loading test (in-situ test) on other surrounding rocks (e.g., a horizontal pit which is an easy-to-work environment) having substantially the same geological properties as the evaluation rocks such as the hydraulic pipeline inclined shaft. A deformation coefficient value and an elastic wave velocity obtained by executing the elastic wave velocity measurement are acquired (s400, s401). Then, a multiple regression analysis is performed based on the acquired deformation coefficient value and elastic wave velocity and the geological property information (geological observation information) of the surrounding rocks (s402). Through this analysis, a multiple regression correlation equation relating to the geological property information and the deformation coefficient is derived (s403).
[0026]
The geological property information includes a rock type distribution ratio (plastic deformation type: conglomerate or sandstone, etc .; elastic deformation type: serpentine or mudstone, etc.) hardness classification (hard to soft), crack interval (cm unit), crack It shall include at least one of the property classification (fragile portion distribution, opening width, inclination angle, etc.) and spring water volume. When the geological properties of the evaluation rock mass or the surrounding rock mass change over time or over time, the items of the geological property information to be used are selectively used in accordance with the geological characteristics at the change point. As a result, accurate rock property evaluation can be performed even for rocks whose geological properties change in a complicated manner.
[0027]
Next, the deformation property value of the evaluation rock is estimated by applying the geological property information of the evaluation rock to the multiple regression correlation formula derived as described above (s404). Further, in addition to these processes, the elastic wave velocity measurement is performed only on one measurement line (eg, one measurement line at the top) on the evaluation rock to acquire the elastic wave velocity of the evaluation rock (s405 and s406). Thus, the strength of the evaluation rock or its change is recognized based on the elastic wave velocity of the evaluation rock (s407).
[0028]
With respect to the strength of the recognized rock mass, it is compared with a predetermined criterion to determine whether or not individual examination of the deformation coefficient is necessary (s408). This judgment is performed in order to flexibly cope with, for example, a case where the rock mass to be evaluated has a property that is significantly different from the surrounding rock mass of the same nature (eg, a sudden change point, extremely weakness, etc.). You.
[0029]
If it is determined that the individual examination is not necessary, the estimated deformation coefficient value is set as the deformation coefficient value of the evaluation rock (s410), and the process ends. On the other hand, when it is determined by the above determination that the individual study is necessary, the finite element method analysis is performed on the individual study part, and the deformation coefficient value is newly calculated (s411). The newly calculated deformation coefficient value is estimated to be the deformation coefficient value of the evaluation rock, and the processing is terminated.
[0030]
Next, a detailed flow will be described. FIG. 5 is a diagram showing a detailed flow of the rock physical property evaluation method. In addition, various types of information for processing shown in conjunction with the system 100 in FIG. As the type of information to be processed, as shown in FIG. 3, each information of a flat plate loading test, an elastic wave velocity measurement, and a result of geological observation at a construction point as another rock around the original position can be assumed. In addition, for the plate loading test, the synthetic deformation coefficient, the elastic wave velocity measurement for the loose area elastic wave velocity, the loose area depth, and the base rock elastic wave velocity, and for the geological observation results, rock type distribution ratio, hardness classification, Information on the crack interval, crack property classification, and spring water amount is to be processed. These pieces of information are referred to as information 110 on other surrounding rocks. On the other hand, the geological observation results and the information on the elastic wave velocity measurement are also processed for the original design site where the evaluation rock mass exists. This will be referred to as evaluation rock information 120.
[0031]
Information 110 on the surrounding rocks is stored in the preceding test / geological observation result database 103 via the PDA 101. In addition, the information 120 of the evaluation bedrock is also stored in the geological database 104 via the PDA 101.
[0032]
The system 100 first extracts geological information (geological properties or geological observation results) of the surrounding rocks having substantially the same properties as the evaluation rock from the preceding test / geological observation result database 103 (s501), and performs sensitivity analysis on the information. (S502). Then, highly sensitive geological information is recognized (s503).
[0033]
On the other hand, based on the results of the plate loading test and elastic wave velocity measurement performed on the surrounding rocks, the calculation of the composite deformation coefficient (s504) and the calculation of the elastic wave velocity and the depth of the loose area (s508) were performed. Perform processing. Further, a finite element method analysis is executed based on the calculated composite deformation coefficient (s505), and a base rock deformation coefficient is calculated (s506). In this calculation, it is assumed that the base rock elastic wave velocity is separately calculated (s507) and reflected. A multiple regression analysis is performed using the information on the geological properties thus derived and various test results in combination to derive a multiple regression correlation equation that indicates the correlation between the geological information and the deformation coefficient of the base rock (s510).
[0034]
On the other hand, processing is also performed on the information of the geological observation result and the information of the elastic wave velocity measurement obtained for the design location. Here, the geological information obtained as a result of the geological observation is stored in the geological database 104 (s520). In addition, by applying the geological information to the multiple regression correlation equation while excluding the margin, the base rock deformation coefficient of the evaluation rock is estimated (s521, s522).
[0035]
With respect to the obtained base rock deformation coefficient, the result of the elastic wave velocity measurement performed on only one measurement line in the evaluation rock, that is, the elastic wave velocity of the evaluation rock is applied by simple regression (s523, s524). Thereby, for example, a part where the evaluation rock is extremely weak is recognized (s525), and the necessity of individual examination of the deformation coefficient is determined. When it is determined by the above determination that the individual study is necessary (s525: YES), the finite element method analysis is performed on the individual study location (s526), and the amount of wall displacement is calculated (s527). A synthetic deformation coefficient (deformation coefficient value) for design is newly calculated (s528). On the other hand, when it is determined that the individual examination is not necessary (s525: NO), the estimated deformation coefficient value is set as the deformation coefficient value of the evaluation rock, and the process ends.
[0036]
The results of comparison of the evaluation contents obtained by performing the method for evaluating physical properties of rock according to the present invention with the conventional method are shown below. FIG. 6 is a diagram showing each relationship among the geological properties, the elastic wave velocity, and the deformation coefficient. The graph shown in FIG. 6 is obtained by combining the data of rock type ratio, chlorite surface ratio and clay layer ratio, shock wave velocity measurement result, and deformation coefficient along the pipeline extension of a certain hydraulic pipeline shaft. It is shown. What should be noted here is deformation coefficient data that is finally used. In this data, the deformation coefficient (estimated value) obtained according to the present invention substantially matches the result of the in-situ test (that is, the actually measured value). Therefore, it is clear that the estimation is performed with high accuracy while reducing the in-situ test. In addition, the multiple regression correlation equation obtained by the multiple regression correlation analysis is also highly accurate as shown in FIG. Therefore, if the information on the geological properties of the surrounding rocks is appropriately applied to the multiple regression correlation equation, it is possible to estimate the deformation coefficient value with excellent accuracy.
[0037]
【The invention's effect】
As described in detail above, according to the method for evaluating physical properties of a rock according to the present invention, it is possible to suppress the burden of an in-situ test even in an environment such as a shaft or a shaft. Therefore, the rock property evaluation can be performed efficiently and at low cost. Moreover, while efficient evaluation can be performed in this way, it is possible to obtain accurate and favorable evaluation results. This effect can be achieved especially under difficult conditions, such as complicated changes in the geological properties of the rock to be evaluated. In addition, since accurate rock mass evaluation is efficiently realized, the influence on excavation efficiency of a tunnel or the like can be minimized.
Thus, it is possible to provide a rock physical property evaluation method and system, a program, and a recording medium that enable efficient acquisition of good accuracy evaluation results.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of the structure of an inclined shaft for a hydraulic pipeline.
FIG. 2A is a diagram illustrating a test situation of a flat plate loading test, and FIG. 2B is a diagram illustrating an outline of an elastic wave velocity measurement.
FIG. 3 is a diagram illustrating a configuration example of a rock physical property evaluation system.
FIG. 4 is a diagram showing a main flow of a method for evaluating rock properties.
FIG. 5 is a diagram showing a detailed flow of a method for evaluating physical properties of rock.
FIG. 6 is a diagram showing relationships among geological properties, elastic wave velocities, and deformation coefficients.
FIG. 7 is a diagram showing a relationship between an actually measured value and a predicted value in a multiple regression analysis.
[Explanation of symbols]
100 rock mass property evaluation system, system 101 information input terminal, PDA
102 Information processing terminal, personal computer 103 Preliminary test / geological observation result database 104 Geological database 120 Information on evaluation rock mass

Claims (8)

A method for evaluating rock properties,
Performing an in-situ test and elastic wave velocity measurement on other surrounding rocks having substantially the same geological properties as the evaluation rock mass, and obtaining a deformation coefficient value and an elastic wave velocity,
Performing multiple regression analysis based on the acquired deformation coefficient value and elastic wave velocity and the geological property information of the surrounding other rock mass, and deriving a multiple regression correlation equation for the geological property information and the deformation coefficient,
Applying the geological property information of the evaluation rock mass to the multiple regression correlation equation, estimating a deformation coefficient value of the evaluation rock mass,
Performing an elastic wave velocity measurement on only one measurement line in the evaluation rock mass to obtain an elastic wave velocity of the evaluation rock mass;
A step of recognizing the strength of the evaluation rock mass or its change based on the elastic wave velocity of the evaluation rock mass, collating it with a predetermined criterion to determine whether or not individual examination of the deformation coefficient is required; and If it is determined that it is not necessary, the estimated deformation coefficient value as a deformation coefficient value of the evaluation rock,
A rock physical property evaluation method comprising: The rock physical properties according to claim 1, wherein when it is determined that the individual examination is necessary, the finite element method analysis is performed on the individual examination part to newly calculate a deformation coefficient value. Evaluation method. The method according to claim 1 or 2, wherein the evaluation rock is a shaft or a shaft, and the other surrounding rock is a horizontal shaft. The rock property evaluation according to any one of claims 1 to 3, wherein the geological property information includes at least one of a rock type distribution ratio, a hardness class, a crack interval, a crack property class, and a spring water amount. Method. When the geological properties of the evaluation rock mass or the surrounding rock mass change over time or over time, the items of the geological property information to be used are selectively used in accordance with the geological characteristics of the change point. 4. The rock physical property evaluation method according to any one of 4. A system for evaluating rock properties,
Means for performing an in-situ test and an elastic wave velocity measurement on other surrounding rocks having substantially the same geological properties as the evaluation rock mass, and obtaining a deformation coefficient value and an elastic wave velocity,
Performing multiple regression analysis based on the acquired deformation coefficient value and elastic wave velocity, and the geological property information of the surrounding rocks, and deriving a multiple regression correlation equation for the geological property information and the deformation coefficient,
Means for applying the geological property information of the evaluation rock mass to the multiple regression correlation equation and estimating a deformation coefficient value of the evaluation rock mass;
Means for performing elastic wave velocity measurement on only one measurement line in the evaluation rock mass to obtain an elastic wave velocity of the evaluation rock mass;
Means for recognizing the strength or change of the evaluation rock mass based on the elastic wave velocity of the evaluation rock mass and comparing it with a predetermined judgment criterion to judge the necessity of individual examination of the deformation coefficient; and When it is determined that is not necessary, the estimated deformation coefficient value as a deformation coefficient value of the evaluation rock,
A rock physical property evaluation system comprising: A program for causing a computer to execute a method for evaluating rock properties,
A step of acquiring an deformation coefficient value and an elastic wave velocity obtained by performing an in-situ test and an elastic wave velocity measurement on the surrounding other rocks having substantially the same geological properties as the evaluation rock mass,
Performing multiple regression analysis based on the acquired deformation coefficient value and elastic wave velocity and the geological property information of the surrounding other rock mass, and deriving a multiple regression correlation equation for the geological property information and the deformation coefficient,
Applying the geological property information of the evaluation rock mass to the multiple regression correlation equation, estimating a deformation coefficient value of the evaluation rock mass,
A step of acquiring an elastic wave velocity of the evaluation rock obtained by performing an elastic wave velocity measurement on only one measurement line in the evaluation rock,
A step of recognizing the strength of the evaluation rock mass or its change based on the elastic wave velocity of the evaluation rock mass, collating this with a predetermined determination criterion to determine whether or not individual examination of the deformation coefficient is required; and If it is determined that it is not necessary, the estimated deformation coefficient value as a deformation coefficient value of the evaluation rock,
A rock physical property evaluation program characterized by including: A computer-readable recording medium on which the program for evaluating physical properties of rock according to claim 7 is recorded.

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