CN113902348B - Method for rapidly evaluating radioactivity risk level of tunnel engineering based on intra-hole gamma test - Google Patents
Method for rapidly evaluating radioactivity risk level of tunnel engineering based on intra-hole gamma test Download PDFInfo
- Publication number
- CN113902348B CN113902348B CN202111381969.4A CN202111381969A CN113902348B CN 113902348 B CN113902348 B CN 113902348B CN 202111381969 A CN202111381969 A CN 202111381969A CN 113902348 B CN113902348 B CN 113902348B
- Authority
- CN
- China
- Prior art keywords
- radioactivity
- tunnel
- risk level
- area
- engineering
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000005192 partition Methods 0.000 claims abstract description 35
- 230000002285 radioactive effect Effects 0.000 claims abstract description 27
- 238000005259 measurement Methods 0.000 claims abstract description 16
- 238000010586 diagram Methods 0.000 claims abstract description 13
- 238000011156 evaluation Methods 0.000 abstract description 14
- 238000004364 calculation method Methods 0.000 abstract description 7
- 238000004458 analytical method Methods 0.000 abstract description 2
- 238000005553 drilling Methods 0.000 description 7
- 238000011835 investigation Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000010438 granite Substances 0.000 description 2
- 238000007781 pre-processing Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- 238000000638 solvent extraction Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
- G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
- G06Q10/063—Operations research, analysis or management
- G06Q10/0635—Risk analysis of enterprise or organisation activities
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/167—Measuring radioactive content of objects, e.g. contamination
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
- G06Q50/08—Construction
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Business, Economics & Management (AREA)
- Human Resources & Organizations (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Economics (AREA)
- Strategic Management (AREA)
- General Business, Economics & Management (AREA)
- Theoretical Computer Science (AREA)
- Tourism & Hospitality (AREA)
- Entrepreneurship & Innovation (AREA)
- Marketing (AREA)
- Health & Medical Sciences (AREA)
- Primary Health Care (AREA)
- General Health & Medical Sciences (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Molecular Biology (AREA)
- High Energy & Nuclear Physics (AREA)
- Development Economics (AREA)
- Educational Administration (AREA)
- Life Sciences & Earth Sciences (AREA)
- Game Theory and Decision Science (AREA)
- Operations Research (AREA)
- Quality & Reliability (AREA)
- Measurement Of Radiation (AREA)
Abstract
The invention discloses a method for rapidly evaluating the radioactivity risk level of tunnel engineering based on an in-hole gamma test. At present, the radioactivity evaluation mostly takes single measuring point data or a small area where a measuring point is positioned as an object, and a radioactivity risk grade evaluation method aiming at linear engineering is lacked. According to the invention, radioactive measurement data are obtained through Kong Naga ma test, so as to form a logging result diagram; dividing a radioactive place into an unlimited area, a supervision area and a control area, and dividing a field area where a tunnel engineering is located into a plurality of paragraphs; calculating the ratio of the lengths of different partitions in each paragraph to the total measured length of the paragraph in which the different partitions are positioned, and the ratio and the length of different radioactive horizontal partitions in each paragraph; and evaluating the radioactivity risk level of the tunnel engineering according to the lithology section of the tunnel body. According to the method, a sample presumption whole concept is introduced into the radioactivity risk level evaluation, the radioactivity risk level is presumed based on the arrangement analysis and calculation of measured data, and the actual problems in the engineering industry are solved.
Description
Technical Field
The invention belongs to the technical field of radioactive risk evaluation, and particularly relates to a method for rapidly evaluating the radioactive risk level of tunnel engineering based on an in-hole gamma test.
Background
With the steady promotion of national traffic strategies and the continuous development of related engineering technologies, the tunnel engineering scale and the burial depth are larger and larger, the related area is wide, and the construction of the tunnel engineering is most likely to relate to the radioactive radiation environment. The development of radioactive risk level evaluation for tunnel engineering has gradually become an inevitable requirement for engineering technology development. At present, the radioactivity evaluation is mostly carried out by taking single measuring point data or a small area where a measuring point is positioned as an object, and a radioactivity risk grade evaluation method aiming at linear engineering is lacked, so that the radioactivity risk grade evaluation requirement of a long tunnel is difficult to meet. Therefore, in order to meet the requirement of evaluating the radioactivity level of the tunnel engineering, an radioactivity level evaluation method aiming at a wide linear area of the tunnel engineering is urgently needed.
Disclosure of Invention
In order to make up for the defects of the prior art, the invention provides a method for rapidly evaluating the radioactivity risk level of a tunnel engineering based on an in-hole gamma test, which realizes the evaluation of the radioactivity risk level of a linear engineering where the tunnel engineering is located.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a method for rapidly evaluating radioactivity risk level of tunnel engineering based on intra-hole gamma test comprises the following steps:
Step one: rapidly acquiring intra-well radioactivity measurement data by Kong Naga ma testing;
step two: the radioactivity measurement data in the holes are tidied, and a logging result diagram is formed;
step three: dividing the radioactive place into a non-limiting area, a supervision area and a control area;
step four: dividing a field region where the tunnel engineering is located into a plurality of paragraphs according to the lithology of the tunnel portal;
Step five: counting the total length of different partitions in each section;
step six: calculating the proportion of different partition lengths in each paragraph to the total length measurement of the paragraph;
Step seven: calculating the duty ratio and the length of different radioactivity horizontal sub-areas in each section of the whole tunnel;
Step eight: and evaluating the radioactivity risk level of the tunnel engineering according to the lithology section of the tunnel body.
The invention has the beneficial effects that:
1) The invention has the advantages of convenient acquisition of the needed basic data, easy implementation and low cost;
2) The calculation method is simple, quick and easy to understand, and has the advantages of being exemplary and generalizable;
3) According to the invention, the natural gamma test is carried out in the borehole during the investigation, so that the function of the borehole during the investigation is increased, and the utilization rate of logging data is improved;
4) According to the method, the concept of 'sample presumption integration' is introduced into the radioactive risk level evaluation of tunnel engineering, the radioactive risk level of the tunnel engineering can be presumed based on the arrangement analysis and the statistical calculation of measured data, and the practical problem encountered in the engineering industry is solved.
Drawings
FIG. 1 is a flow chart of the operation of the present invention;
FIG. 2 is a schematic diagram of a logging result formed after the raw data are consolidated;
FIG. 3 is a schematic diagram of different zones of a borehole logging effort.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
As shown in the operational flow chart of the present invention of fig. 1, the present invention comprises the steps of:
Step one: rapidly acquiring intra-well radioactivity measurement data by Kong Naga ma testing;
and in the tunnel investigation stage, drilling holes are uniformly arranged along two sides of a central line of the tunnel by combining stratum lithology and geological structure, and gamma test is carried out in the drilling holes, so that the acquisition of radioactive original data is realized.
Step two: the radioactivity measurement data in the holes are tidied, and a logging result diagram is formed;
performing anti-false-and-false preprocessing on the original data obtained in the step one, and eliminating the influence of factors such as interference factors, statistical fluctuation factors, errors existing in a measuring instrument and the like on logging data; the data are processed by a preferred filtering method to obtain natural gamma values gamma of different depths in a borehole, wherein the units are mu R/h, and a gamma logging result diagram shown in figure 2 is drawn.
Step three: dividing the radioactive place into a non-limiting area, a supervision area and a control area;
Taking the natural gamma values of 426 mu R/h and 1276 mu R/h as demarcation points to divide three radioactive levels of gamma <426 mu R/h, 426 mu R/h less than or equal to gamma less than or equal to 1276 mu R/h and gamma >1276 mu R/h into consideration of the influence of normal public residence time on human bodies, wherein the corresponding radioactive levels are respectively a non-limiting area, a supervision area and a control area, and the supervision area and the control area are jointly called a monitoring area.
The basis of the division criteria is as follows:
According to the "poor geological prospecting regulations for railway engineering" (TB 10027-2012), the radiation workplace can be divided into an unlimited region (He <5 mSv), a supervision region (He is more than or equal to 5mSv and less than or equal to 15 mSv) and a control region (He >15 mSv) according to the annual effective dose He; the annual working time length is determined according to actual engineering conditions, the invention calculates according to the annual normal public residence time of 250d multiplied by 8h=2000 h, and the demarcation point of the actual measured natural gamma value is reversely calculated through the demarcation point of the annual effective dose He.
Wherein, gamma is a natural gamma value, and the unit is mu R/h; he is an annual effective dose in mSv; kr is the air absorption coefficient, 0.838×10-8; ks is the ratio of the effective dose equivalent rate to the air absorption dose rate, and 0.7X106 is taken; t is the annual exposure time, the unit is h, and 2000h is taken.
Step four: dividing a field region where the tunnel engineering is located into a plurality of paragraphs according to the lithology of the tunnel portal;
Step five: counting the total length of different partitions in each section;
and carrying out segmentation statistical calculation on the linear region where the tunnel is located according to the lithology of the tunnel body. And (3) according to the radioactive logging result diagram obtained in the second step and the radioactive partition divided in the third step, counting and calculating the lengths of different partitions of each drilling hole in each lithology section according to different partition schematics of the drilling holes in the figure 3, and accumulating the lengths of the same partition of all the drilling holes. The calculation formula of the single lithology section is as follows:
Wherein L i is the length of different radioactive partitions in a lithology section, and the unit is m; n is the number of holes drilled in a lithology section; i is the number of radioactive partitions, i=1, 2,3, where 1 represents a non-limiting region, 2 represents a supervision region, and 3 represents a control region; j is a borehole number, j=1, 2, 3..n; a ij denotes the length of the radioactive partition of i in borehole j in m.
Step six: calculating the proportion of different partition lengths in each paragraph to the total length measurement of the paragraph;
And in the same lithology section, according to the different partition lengths obtained in the step five, obtaining the proportion of the different partition lengths to the total length of all drilling measurements of the lithology section:
Where P i is the ratio of the length of the different radioactive partitions in a lithology section to the total length of all borehole measurements in that lithology section.
Step seven: calculating the duty ratio and the length of different radioactivity horizontal sub-areas in each section of the whole tunnel;
obtaining the proportion of different partition lengths in each lithology section according to the different partition proportion of each lithology section obtained in the step six; furthermore, according to the actual condition of the tunnel engineering, the lengths of each lithology section of the tunnel engineering are obtained, and the lengths of different partitions in each lithology section of the whole tunnel are calculated:
Φi＝Pi
Si＝DΦi
wherein phi i is the ratio of different radioactive partition lengths of a lithology section; d is the length of the tunnel engineering in a certain lithology section
Degree, unit is m; s i is the length of different radioactive partitions in a lithology section of tunnel engineering, and the unit is m.
Step eight: evaluating the radioactivity risk level of tunnel engineering according to the lithology section of the tunnel body;
taking the control area with the ratio of 1%, 2% and 5%, the monitoring area with the ratio of 5%, 10% and 20% and the lengths of 500m,1000m and 2000m as boundary points, dividing the tunnel radioactivity level into five grades of none, low, medium, high and extremely high. The detailed partitioning criteria are as follows:
Note that: the level of radioactivity can be determined by satisfying one of the above conditions.
Examples:
In the process of investigation and design of a certain railway tunnel, the lithology of the tunnel body is granite, and the radioactive risk level of the tunnel is evaluated by adopting a method for rapidly evaluating the radioactivity level of tunnel engineering based on Kong Naga ma test aiming at the characteristic that the radioactivity in a tunnel address area is possibly abnormal. The method specifically comprises the following steps:
Step one: rapidly acquiring intra-well radioactivity measurement data by Kong Naga ma testing;
during the tunnel investigation, kong Naga ma tests were performed in 27 boreholes of the tunnel, the cumulative test depth was 12778m, and the raw data of the radioactivity test were obtained.
Step two: the radioactivity measurement data in the holes are tidied, and a logging result diagram is formed;
Performing anti-false-and-false preprocessing on the original data obtained in the step one, and eliminating the influence of factors such as interference factors, statistical fluctuation factors, errors existing in a measuring instrument and the like on logging data; the data are processed by a preferred filtering method, natural gamma values gamma of different depths in a borehole are obtained, the unit is mu R/h, and a gamma logging result diagram shown in figure 2 is drawn.
Step three: dividing the radioactive place into a non-limiting area, a supervision area and a control area;
Taking natural gamma values of 426 mu R/h and 1276 mu R/h as demarcation points, dividing three radioactivity level grades of gamma smaller than 426 mu R/h, gamma smaller than or equal to 426 mu R/h and smaller than or equal to 1276 mu R/h and gamma larger than 1276 mu R/h, wherein the corresponding radioactivity level grades are respectively a non-limiting area, a supervision area and a control area, and the supervision area and the control area are collectively called as a monitoring area.
Step four: dividing a field region where the tunnel engineering is located into a plurality of paragraphs according to the lithology of the tunnel portal;
in this embodiment, the tunnel cavity lithology is all granite, so the tunnel is divided into one paragraph.
Step five: counting the total length of different partitions in each section;
and carrying out segmentation statistical calculation on the linear region where the tunnel is located according to the lithology of the tunnel body. For each lithology section, according to the radioactive logging result diagram obtained in the second step and the radioactive partition divided in the third step, referring to different partition diagrams of the drilled holes in fig. 3, the lengths of different partitions of each drilled hole in the lithology section are counted and calculated, and the lengths of the same partition of all the drilled holes are accumulated;
The first paragraph in this embodiment: l1= 12674.5m; l2=101.3m; l3=2.2m.
Step six: calculating the proportion of different partition lengths in each paragraph to the total length measurement of the paragraph;
And in the same lithology section, according to the different partition lengths obtained in the step five, obtaining the proportion of the different partition lengths to the total length of all drilling measurements of the lithology section:
The first paragraph in this example, p1=99.19%; p2=0.79%; p3=0.02%.
Step seven: calculating the duty ratio and the length of different radioactivity horizontal sub-areas in each section of the whole tunnel;
obtaining the proportion of different partition lengths in each lithology section according to the different partition proportion of each lithology section obtained in the step six; furthermore, according to the actual condition of the tunnel engineering, the lengths of each lithology section of the tunnel engineering are obtained, and the lengths of different partitions in each lithology section of the whole tunnel are calculated:
The first paragraph in this embodiment: Φ1=99.19%; Φ2=0.79%; Φ3=0.02%; Φ2+Φ3=0.81%; d=42374m, s1= 42030.77m; s2= 334.76m; s3=8.47 m; s2+s3= 343.23m.
Step eight: evaluating the radioactivity risk level of tunnel engineering according to the lithology section of the tunnel body;
taking the control area with the ratio of 1%, 2% and 5%, the monitoring area with the ratio of 5%, 10% and 20% and the lengths of 500m,1000m and 2000m as boundary points, dividing the tunnel radioactivity level into five grades of none, low, medium, high and extremely high. The detailed partitioning criteria are as follows:
Note that: the level of radioactivity can be determined by satisfying one of the above conditions.
According to the radioactivity level evaluation standard of tunnel engineering, the radioactivity level of the tunnel is shown in the following table (when a plurality of lithology sections exist in the area, each lithology section should be calculated respectively):
The radioactivity level of the tunnel is low, the line does not pass through a radioactivity enrichment zone, and measures such as real-time monitoring can be adopted.
Aiming at the characteristics that tunnel engineering belongs to linear engineering, the technical scheme firstly provides a scheme for carrying out Kong Naga-mer testing in a tunnel investigation stage to obtain original data, acquiring natural gamma values of a plurality of measuring points in a borehole through data arrangement, drawing gamma test result diagrams in each borehole, carrying out statistical calculation and judging the radioactivity risk level of the tunnel engineering. The method realizes the rapid evaluation and judgment of the radioactivity risk level of the tunnel linear engineering, and effectively solves the practical difficulties encountered in tunnel engineering construction. The technical scheme can be applied to the evaluation of the radioactivity risk level of the tunnel engineering, and provides technical reference and support for the tunnel engineering construction.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and "secured" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The content of the invention is not limited to the examples listed, and any equivalent transformation to the technical solution of the invention that a person skilled in the art can take on by reading the description of the invention is covered by the claims of the invention.
Claims (1)
1. A method for rapidly evaluating the radioactivity risk level of tunnel engineering based on an intra-hole gamma test is characterized by comprising the following steps: the method comprises the following steps:
Step one: rapidly acquiring intra-well radioactivity measurement data by Kong Naga ma testing;
step two: the radioactivity measurement data in the holes are tidied, and a logging result diagram is formed;
step three: dividing the radioactive place into a non-limiting area, a supervision area and a control area;
step four: dividing a field region where the tunnel engineering is located into a plurality of paragraphs according to the lithology of the tunnel portal;
Step five: counting the total length of different partitions in each section;
step six: calculating the proportion of different partition lengths in each paragraph to the total length measurement of the paragraph;
Step seven: calculating the duty ratio and the length of different radioactivity horizontal sub-areas in each section of the whole tunnel;
Step eight: and evaluating the radioactivity risk level of the tunnel engineering according to the lithology section of the tunnel body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111381969.4A CN113902348B (en) | 2021-11-22 | 2021-11-22 | Method for rapidly evaluating radioactivity risk level of tunnel engineering based on intra-hole gamma test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111381969.4A CN113902348B (en) | 2021-11-22 | 2021-11-22 | Method for rapidly evaluating radioactivity risk level of tunnel engineering based on intra-hole gamma test |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113902348A CN113902348A (en) | 2022-01-07 |
| CN113902348B true CN113902348B (en) | 2024-04-30 |
Family
ID=79194876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111381969.4A Active CN113902348B (en) | 2021-11-22 | 2021-11-22 | Method for rapidly evaluating radioactivity risk level of tunnel engineering based on intra-hole gamma test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113902348B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116307730A (en) * | 2023-03-30 | 2023-06-23 | 长江勘测规划设计研究有限责任公司 | A construction risk assessment method, recording medium and system for a deep buried tunnel |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104217297A (en) * | 2014-09-16 | 2014-12-17 | 北京交通大学 | Dynamic security risk assessment method of rail transit station |
| KR20190028934A (en) * | 2017-09-11 | 2019-03-20 | 한국지질자원연구원 | Method and system for estimating risk of acid rock drainage producing in civil engineering works area |
| CN110458367A (en) * | 2019-08-16 | 2019-11-15 | 西安科技大学 | A method for evaluating the geological hazard of gas in coal mine working face |
| CN111523796A (en) * | 2020-04-21 | 2020-08-11 | 西南石油大学 | Hazard assessment method for harmful gases in non-coal tunnels |
| CN112230263A (en) * | 2020-09-04 | 2021-01-15 | 核工业二〇八大队 | Geological comprehensive investigation and evaluation method for radioactive environment of underground coal mining |
-
2021
- 2021-11-22 CN CN202111381969.4A patent/CN113902348B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104217297A (en) * | 2014-09-16 | 2014-12-17 | 北京交通大学 | Dynamic security risk assessment method of rail transit station |
| KR20190028934A (en) * | 2017-09-11 | 2019-03-20 | 한국지질자원연구원 | Method and system for estimating risk of acid rock drainage producing in civil engineering works area |
| CN110458367A (en) * | 2019-08-16 | 2019-11-15 | 西安科技大学 | A method for evaluating the geological hazard of gas in coal mine working face |
| CN111523796A (en) * | 2020-04-21 | 2020-08-11 | 西南石油大学 | Hazard assessment method for harmful gases in non-coal tunnels |
| CN112230263A (en) * | 2020-09-04 | 2021-01-15 | 核工业二〇八大队 | Geological comprehensive investigation and evaluation method for radioactive environment of underground coal mining |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113902348A (en) | 2022-01-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9835757B2 (en) | Pulsed-neutron tool methods and systems for monitoring casing corrosion | |
| CN112904436B (en) | Porosity measurement method combining element yield and thermal neutron count ratio | |
| CN105545284A (en) | While-drilling gamma imaging data processing method | |
| CN202755971U (en) | Drill-following controllable source neutron logging instrument | |
| CN107966739B (en) | Delineation of Thorium Radioactivity Anomalies | |
| CN113902348B (en) | Method for rapidly evaluating radioactivity risk level of tunnel engineering based on intra-hole gamma test | |
| CN105549083B (en) | A kind of method and apparatus for determining seismic observation system repeatability and integrally measuring | |
| EP0106058A1 (en) | Method and apparatus for determining characteristics of clay-bearing formations | |
| CN104594888A (en) | Oil layer identification method based on tight reservoir conductivity factor experiment | |
| CN103235350B (en) | Radioactivity well logging instrument Detection of Stability and scale method and device | |
| CN1151385C (en) | Method for determining hydrocarbon saturation degree instratum and hydrocarbon retention quantity in bore-hole | |
| US4756189A (en) | Method and apparatus for determining characteristics of clay-bearing formations | |
| CN117890997B (en) | Method for rapidly identifying sulfide polymetallic ore based on soil hydrogen | |
| CN111123379B (en) | A Pure Inelastic Gamma Spectrum Acquisition Method Based on Bispectral Combination | |
| CN112523741A (en) | Uranium ore quantitative scale coefficient solving method based on energy spectrum logging cross spectrum section | |
| CN112523742A (en) | Uranium ore quantitative scale coefficient solving method based on energy spectrum logging characteristic spectrum section | |
| CN106872669A (en) | A kind of electrical sorting technique of granite fractured reservoir in buried hill | |
| CN201057044Y (en) | Sliding plate of lithology density logger with variable structure parameter | |
| CN103498658A (en) | Gamma logging data processing method | |
| CN115012920A (en) | Controllable neutron source multi-spectrum logging instrument and method based on double CLYC double-particle detectors | |
| US5272629A (en) | Method for determining the slowing down length and the porosity of a formation surrounding a borehole | |
| RU2075100C1 (en) | Method of neutron-neutron pulsed logging | |
| CN114592854B (en) | Well logging identification method for reservoirs containing turbidite | |
| CN207795243U (en) | A kind of multiduty pulsed neutron log instrument | |
| US20230228906A1 (en) | Five-point deconvolution interpretation method for quantification of uranium ores by gamma spectrum logging |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |