CN106483197A - A kind of Floor Heave in Roadway sorting technique based on original position sonic test - Google Patents
A kind of Floor Heave in Roadway sorting technique based on original position sonic test Download PDFInfo
- Publication number
- CN106483197A CN106483197A CN201610751900.9A CN201610751900A CN106483197A CN 106483197 A CN106483197 A CN 106483197A CN 201610751900 A CN201610751900 A CN 201610751900A CN 106483197 A CN106483197 A CN 106483197A
- Authority
- CN
- China
- Prior art keywords
- roadway
- boring
- original position
- sorting technique
- technique based
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/043—Analysing solids in the interior, e.g. by shear waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/011—Velocity or travel time
Abstract
The invention discloses a kind of Floor Heave in Roadway sorting technique based on original position sonic test, the base plate at roadway head rear drills through boring, initial sonic waves speed V0 in boring build-in test different depth, according to V0, rock mass strength is classified, then any time during follow-up tunnelling, in the SVEL Vp to be measured on the boring each stratum of build-in test, according to the functional relationship between mining influence index and V0 and Vp, draw mining influence index, thus classifying to country rock.Floor Heave in Roadway sorting technique based on original position sonic test proposed by the present invention, by wave speed distribution rule and its variation characteristic of tunnel floor strata in test analysis mining process, roadway floor rock mass is classified according to hardness and mining influence situation, thus providing basis for the selection of floor lift control method.
Description
Technical field
The present invention relates to the mineral products energy and deep Geotechnical Engineering production technical field, more particularly, to one kind are based on original position sound wave
The Floor Heave in Roadway sorting technique of test.
Background technology
China's majority coal mining geology complicated condition, deep wall rock crustal stress is big, and geological mechanic for surrounding rocks environment is poor, supporting construction
Body bearing capacity is low, and strong by mining influence, in particular with the continuous progress of China's coal-mine production technique, mine constantly to
Modernization, development of maximizing, winning apparatus is just more and more large-scale, and mine also must increase drift section, could meet coal
The needs of the aspects such as transport, main equipment use, ventilation.With the increasing of mining depth and drift section, deformation of the surrounding rock in tunnel
Destroy serious, lead to deformation of the surrounding rock in tunnel amount to dramatically increase, Surrounding Rock Control difficulty increases, under easily occurring pucking, top board violent
The unstable failure phenomenons such as heavy, roof fall slump, especially pucking are even more serious to safe and efficient Influence of production so that drift section contracts
Little, hinder transport, ventilation and personnel's walking, cause because of pucking the phenomenon that tunnel is scrapped to happen occasionally, it has also become deep tunnel
The key character that ore deposit pressure manifests.In the middle of all tunnels, the wall rock condition of stope drift active workings, stress state are the most complicated, add softer
Weak floor strata and ahead work face prop up the impact of bearing capacity, and pucking phenomenon is more universal, and nearly all stope drift active workings are all deposited
In different degrees of pucking.Therefore, technology anxious to be resolved in Deep Mine recovery process has been become to the effective control of pucking
A difficult problem.
Although, domestic and international experts and scholars have carried out a large amount of in-depth study work to the mechanism of pucking and its control method,
Test method and the measure of a lot of floor lift control successfully, mainly have several classes as follows：(1) method for strengthening, such as floor grouting, base plate anchor
Bar, closed support, block arch and concrete anti-arch etc.；(2) destressing method, makes continuous rock originally by certain methods such as joint-cuttings
Body is in discrete state, makes floor rock be in stress relaxed area, thus keeping stablizing of base plate, concrete grammar has base plate to cut
Stitch, two help joint-cutting, boring, standing and release coal column etc.；(3) roadside packing method, the method is similar to release coal column, first
First a range of for roadway's sides coal is produced, be further filled with filler it is desired to the existing certain Support Resistance of filler
There is certain yielding property energy, purpose is to make lane side stress shift to deep, reaches the purpose of floor lift control again；(4) combine control
Preparation method, that is, according to concrete engineering condition, is comprehensively controlled using above two or multiple technologies.
These pucking control measure all rely on different engineering geological conditions, and principle is also not quite similar, and need according to reality
Border rock stratum physical and mechanical parameter, stress state and its by mining influence situation etc., carry out the deep pucking control technology suitability
Study and to proposition targetedly control measure and parameter.However, because geological condition of coal mine is complicated, developing mining distribution is each
Different, and limited by observation method, currently lack quick, the testing research method of system and means.Prior art is commonly used
Design with controlling thinking be, initially with live coring, indoor processing sample and test analysis obtain floor strata physical force
Learn parameter, then carry out surrounding rock control method primary election according to this test parameter with reference to geological condition of coal mine and calculate with design, finally
Carry out site operation Monitoring and Controlling effect, and then design calculating parameter is improved and is optimized.Subject matter shows three
Individual aspect：First, coring test sample quantity is few, representative not strong, and processing testing cost height, poor in timeliness, efficiency are low, no
Can directly, rapidly be applied in the calculating of Floor Heave in Roadway control design case；Second, laboratory experiment test to change rock original
Geology and force environment, and it is subject to artificial disturbance larger, greatly change the original attribute of country rock, cause the test data can
Not high by degree；Third, the tunnel impact situation to tunnel for the mining activity nearby can not be reflected real-time, cause original setting
Meter calculates and engineering physical presence larger difference.Therefore, current coal mine roadway pucking control design case is largely dependent upon work
The engineering judgement of journey technical staff and practical experience, have certain blindness, lead to many Floor Heave in Roadway controls in actual production
Effect on driving birds is not good processed, some design parameters are relatively conservative, cause serious waste；And separately have some deformation of the surrounding rock in tunnel to lose control of,
Seriously govern the raising of mine safety high-efficiency mining level.
Content of the invention
For solving technical problem present in background technology, the present invention proposes a kind of tunnel bottom based on original position sonic test
Drum sorting technique.
A kind of Floor Heave in Roadway sorting technique based on original position sonic test proposed by the present invention, comprises the following steps：
S1, in initial time T0, the base plate at current roadway head rear drills through at least one boring；
S2, S1 boring build-in test different depth initial sonic waves speed V0, according to V0, rock mass strength is classified；
S3, during follow-up tunnelling any time T1, in the sound wave to be measured speed on the boring each stratum of build-in test of S1
Degree Vp；
S4, based on the initial sonic waves speed obtaining in S2 and S3 and SVEL to be measured, according to mining influence index and V0
Functional relationship and Vp between, draws mining influence index K, and according to K, country rock is classified.
Preferably, in S1, boring in install guard aperture sleeve pipe, and pass through cement mortar by described guard aperture sleeve pipe with described
Initial bore hole inwall and base plate are fixed.
Preferably, in S1, the depth of described boring is L1, and the length of described guard aperture sleeve pipe is L2, L1：L2=(3-5)：
1.
Preferably, in S1, the depth of described boring is 10-15 rice, and a diameter of 70-80 millimeter of described boring.
Preferably, drill through multiple borings, test Vn0 and Vnp of each boring, wherein n is natural number.
Preferably, in S2, as V0 ＞ 4800, then Rock Mass Classification is hard rock；As 3500 ＜ V0 ＜ 4800, then
Rock Mass Classification is hard rock；As 2500 ＜ V0 ＜ 3500, then Rock Mass Classification is middle soft rock；As 1500 ＜ V0 ＜ 2500,
Then Rock Mass Classification is soft rock；As V0 ＜ 1500, then Rock Mass Classification is ultimate soft rock.
Preferably, in S4, by V0 and Vp is substituted into following equation, calculate mining influence index K：
K=[(VP-V0)/V0]2.
Preferably, in S4, as K ＞ 0.7, then mining influence degree is strong；As 0.4 ＜ K ＜ 0.7, then adopt
Influence degree is stronger；As 0.1 ＜ K ＜ 0.4, then mining influence degree is medium；As K ＜ 0.1, then mining influence degree
It is weaker.
Preferably, in S2, multiple initial sonic waves speed V0m of recording of different depth in boring are carried out with average and all
The statistical analysiss of variance, thus rock mass strength is carried out with preliminary classification, wherein m is natural number.
In the present invention, the Floor Heave in Roadway sorting technique based on original position sonic test that proposed, in roadway head
Drill through boring on the base plate at rear, in initial sonic waves speed V0 of boring build-in test different depth, according to V0, rock mass strength is entered
Row classification, then any time during follow-up tunnelling, in the SVEL Vp to be measured on the boring each stratum of build-in test, root
According to the functional relationship between mining influence index and V0 and Vp, draw mining influence index, thus classifying to country rock.Pass through
The Floor Heave in Roadway sorting technique based on original position sonic test of above-mentioned optimization design, by tunnel bottom in test analysis mining process
The wave speed distribution rule of slate layer and its variation characteristic, roadway floor rock mass is classified according to hardness and mining influence situation, from
And it is the selection offer basis of floor lift control method.
Brief description
Fig. 1 is a kind of flow chart of Floor Heave in Roadway sorting technique based on original position sonic test proposed by the present invention.
Specific embodiment
As shown in figure 1, Fig. 1 is a kind of stream of Floor Heave in Roadway sorting technique based on original position sonic test proposed by the present invention
Cheng Tu.
With reference to Fig. 1, a kind of Floor Heave in Roadway sorting technique based on original position sonic test proposed by the present invention, including following step
Suddenly：
S1, in initial time T0, the base plate at current roadway head rear drills through at least one boring；
S2, S1 boring build-in test different depth initial sonic waves speed V0, according to V0, rock mass strength is classified；
S3, during follow-up tunnelling any time T1, in the sound wave to be measured speed on the boring each stratum of build-in test of S1
Degree Vp；
S4, based on the initial sonic waves speed obtaining in S2 and S3 and SVEL to be measured, according to mining influence index and V0
Functional relationship and Vp between, draws mining influence index K, and according to K, country rock is classified.
In the present embodiment, the Floor Heave in Roadway sorting technique based on original position sonic test being proposed, in drift miner
Drill through boring on the base plate making face rear, boring build-in test different depth initial sonic waves speed V0, strong to rock mass according to V0
Degree is classified, then any time during follow-up tunnelling, in the SVEL to be measured on the boring each stratum of build-in test
Vp, according to the functional relationship between mining influence index and V0 and Vp, draws mining influence index, thus carrying out to country rock point
Class.By the Floor Heave in Roadway sorting technique based on original position sonic test for the above-mentioned optimization design, by test analysis mining process
The wave speed distribution rule of middle tunnel floor strata and its variation characteristic, by roadway floor rock mass according to hardness and mining influence situation
Classification, thus provide basis for the selection of floor lift control method.
In a specific embodiment, in order to ensure stability and the follow-up test safety of drilling orifice, install in boring
Guard aperture sleeve pipe, and by cement mortar, described guard aperture sleeve pipe is fixed with described initial bore hole inwall and base plate.
In further embodiment, the depth of described boring is L1, and the length of described guard aperture sleeve pipe is L2, L1：L2=
(3-5)：1, the depth of described boring is 10-15 rice, and a diameter of 70-80 millimeter of described boring.
In other specific embodiments, when rock hardness being classified according to initial testing speed V0, in S2, when
During V0 ＞ 4800, then Rock Mass Classification is hard rock；As 3500 ＜ V0 ＜ 4800, then Rock Mass Classification is hard rock；When 2500
During ＜ V0 ＜ 3500, then Rock Mass Classification is middle soft rock；As 1500 ＜ V0 ＜ 2500, then Rock Mass Classification is soft rock；Work as V0
During ＜ 1500, then Rock Mass Classification is ultimate soft rock.
In S4, by V0 and Vp is substituted into following equation, calculate mining influence index K：
K=[(VP-V0)/V0]2.
When rock mass containment body hardness specifically being classified according to mining influence index K, as K ＞ 0.7, then mining influence journey
Spend for strong；As 0.4 ＜ K ＜ 0.7, then mining influence degree is stronger；As 0.1 ＜ K ＜ 0.4, then mining influence degree
For medium；As K ＜ 0.1, then mining influence degree is weaker.
In being embodied as, different classes of lower Floor Heave in Roadway feature and mechanism can be researched and analysed, be respectively directed to not
Pucking mechanism under generic proposes method for strengthening, destressing method, roadside packing method or synthetic method control technology, for realizing quickly having
Sequence, safely and efficiently shaft production provide safeguard.
In order to improve the degree of accuracy of rock body types analysis, in other specific embodiments, in S2, also in measurement boring
Interval transit time, rock mass acoustic wave character analysis is carried out according to interval transit time and initial sonic waves speed.
In other specific embodiments, in order to improve the degree of accuracy of Floor Heave in Roadway classification, carry out at the tunnelling initial stage
Drill through initial bore hole, different depth records V0m in initial bore hole, then at driving impact stable phase, working face extraction initial stage
And back production affects stable phase and tests V1Px, V2Px, V3Px respectively, thus obtaining sound wave along drilling depth change curve to be measured, and
Calculate multiple Kx.
In another specific embodiment, drill through multiple borings during tunnelling, test each boring Vn0 and
Vnp, wherein n are natural number, improve the certainty of measurement of V0 and VP.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any those familiar with the art the invention discloses technical scope in, technology according to the present invention scheme and its
Inventive concept equivalent or change in addition, all should be included within the scope of the present invention.
Claims (9)
1. a kind of Floor Heave in Roadway sorting technique based on original position sonic test is it is characterised in that comprise the following steps：
S1, in initial time T0, the base plate at current roadway head rear drills through at least one boring；
S2, S1 boring build-in test different depth initial sonic waves speed V0, according to V0, rock mass strength is classified；
S3, during follow-up tunnelling any time T1, S1 boring each stratum of build-in test SVEL Vp to be measured；
S4, based on the initial sonic waves speed obtaining in S2 and S3 and SVEL to be measured, according to mining influence index and V0 and Vp
Between functional relationship, draw mining influence index K, and according to K, country rock classified.
2. the Floor Heave in Roadway sorting technique based on original position sonic test according to claim 1 is it is characterised in that in S1
In, in boring, guard aperture sleeve pipe is installed, and by cement mortar by described guard aperture sleeve pipe and described initial bore hole inwall and base plate
Fixing.
3. the Floor Heave in Roadway sorting technique based on original position sonic test according to claim 2 is it is characterised in that in S1
In, the depth of described boring is L1, and the length of described guard aperture sleeve pipe is L2, L1：L2=(3-5)：1；Preferably, in S1, institute
The depth stating boring is 10-15 rice, and a diameter of 0.07-0.08 rice of described boring.
4. the Floor Heave in Roadway sorting technique based on original position sonic test according to claim 1 is it is characterised in that drill through many
Individual boring, tests Vn0 and Vnp of each boring, and wherein n is natural number.
5. the Floor Heave in Roadway sorting technique based on original position sonic test according to claim 1 is it is characterised in that in S2
In, as V0 ＞ 4800, then Rock Mass Classification is hard rock；As 3500 ＜ V0 ＜ 4800, then Rock Mass Classification is hard rock；When
During 2500 ＜ V0 ＜ 3500, then Rock Mass Classification is middle soft rock；As 1500 ＜ V0 ＜ 2500, then Rock Mass Classification is soft rock；
As V0 ＜ 1500, then Rock Mass Classification is ultimate soft rock.
6. the Floor Heave in Roadway sorting technique based on original position sonic test according to claim 1 is it is characterised in that in S4
In, by V0 and Vp is substituted into following equation, calculate mining influence index K：
K=[(VP-V0)/V0]2.
7. the Floor Heave in Roadway sorting technique based on original position sonic test according to claim 6 is it is characterised in that in S4
In, as K ＞ 0.7, then mining influence degree is strong；As 0.4 ＜ K ＜ 0.7, then mining influence degree is stronger；When 0.1
During ＜ K ＜ 0.4, then mining influence degree is medium；As K ＜ 0.1, then mining influence degree is weaker.
8. the Floor Heave in Roadway sorting technique based on original position sonic test according to claim 1 is it is characterised in that in S2
In, multiple initial sonic waves speed V0m that different depth in boring is recorded carry out the statistical analysiss of average and mean square deviation, thus
Rock mass strength is carried out with preliminary classification, wherein m is natural number.
9. the Floor Heave in Roadway sorting technique based on original position sonic test according to claim 1 is it is characterised in that in S3
In, test SVEL Vpx to be measured in driving impact stable phase, working face extraction initial stage and back production impact stable phase respectively, its
Middle x is natural number, and draws corresponding K x in S4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610751900.9A CN106483197A (en) | 2016-08-28 | 2016-08-28 | A kind of Floor Heave in Roadway sorting technique based on original position sonic test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610751900.9A CN106483197A (en) | 2016-08-28 | 2016-08-28 | A kind of Floor Heave in Roadway sorting technique based on original position sonic test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106483197A true CN106483197A (en) | 2017-03-08 |
Family
ID=58273150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610751900.9A Pending CN106483197A (en) | 2016-08-28 | 2016-08-28 | A kind of Floor Heave in Roadway sorting technique based on original position sonic test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106483197A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109507047A (en) * | 2019-01-04 | 2019-03-22 | 中国地质大学（武汉） | Explosion is on gunite concrete-country rock boundary strength influence experimental rig and method |
| CN109752266A (en) * | 2019-01-04 | 2019-05-14 | 中国地质大学（武汉） | Explosion is on gunite concrete-country rock boundary strength influence experimental rig and method |
| CN111622737A (en) * | 2020-05-20 | 2020-09-04 | 陕西省引汉济渭工程建设有限公司 | Method for rapidly determining stratum rock mass RQD based on borehole sound wave distribution |
| CN114324601A (en) * | 2021-11-04 | 2022-04-12 | 武汉长盛工程检测技术开发有限公司 | Method and device for detecting pile hole rock depth and rock strength of foundation pile |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63103964A (en) * | 1986-10-20 | 1988-05-09 | Yakichi Higo | Nondestructive inspection method |
| KR20080090850A (en) * | 2007-04-06 | 2008-10-09 | (주)유경기술단 | System for determining and predicting rock failure using acoustic emission method |
| CN101975571A (en) * | 2010-09-14 | 2011-02-16 | 中国矿业大学 | Method for automatically monitoring roadway deformation in real time |
| CN103728374A (en) * | 2014-01-07 | 2014-04-16 | 山东理工大学 | Underground engineering wall surrounding rock disaster non-drilling ultrasonic wave lossless real-time monitoring method |
-
2016
- 2016-08-28 CN CN201610751900.9A patent/CN106483197A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63103964A (en) * | 1986-10-20 | 1988-05-09 | Yakichi Higo | Nondestructive inspection method |
| KR20080090850A (en) * | 2007-04-06 | 2008-10-09 | (주)유경기술단 | System for determining and predicting rock failure using acoustic emission method |
| CN101975571A (en) * | 2010-09-14 | 2011-02-16 | 中国矿业大学 | Method for automatically monitoring roadway deformation in real time |
| CN103728374A (en) * | 2014-01-07 | 2014-04-16 | 山东理工大学 | Underground engineering wall surrounding rock disaster non-drilling ultrasonic wave lossless real-time monitoring method |
Non-Patent Citations (3)
| Title |
|---|
| 刘宗才: "用钻孔声波法观测采后底板破坏深度", 《山东矿山学院学报》 * |
| 邵明喜: "声波法测试煤层采动底板变形破坏深度", 《能源技术与管理》 * |
| 阎铁 等: "<深部井眼岩石力学理论与实践>", 30 September 2002, 石油工业出版社 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109507047A (en) * | 2019-01-04 | 2019-03-22 | 中国地质大学（武汉） | Explosion is on gunite concrete-country rock boundary strength influence experimental rig and method |
| CN109752266A (en) * | 2019-01-04 | 2019-05-14 | 中国地质大学（武汉） | Explosion is on gunite concrete-country rock boundary strength influence experimental rig and method |
| CN111622737A (en) * | 2020-05-20 | 2020-09-04 | 陕西省引汉济渭工程建设有限公司 | Method for rapidly determining stratum rock mass RQD based on borehole sound wave distribution |
| CN111622737B (en) * | 2020-05-20 | 2023-03-10 | 陕西省引汉济渭工程建设有限公司 | Method for rapidly determining RQD of stratum rock mass based on drilling sound wave distribution |
| CN114324601A (en) * | 2021-11-04 | 2022-04-12 | 武汉长盛工程检测技术开发有限公司 | Method and device for detecting pile hole rock depth and rock strength of foundation pile |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Waclawik et al. | Stress-state monitoring of coal pillars during room and pillar extraction | |
| CN106483197A (en) | A kind of Floor Heave in Roadway sorting technique based on original position sonic test | |
| CN102852524B (en) | Method for utilizing hydraulic support to improve bauxite recovery rate | |
| CN102777185A (en) | Inclined well shaft construction technology | |
| CN110792450B (en) | Method for determining advanced support of grouting anchor cable | |
| Liang et al. | Study on roof-coal caving characteristics with complicated structure by fully mechanized caving mining | |
| CN111695790A (en) | Mining method for security pillar | |
| Jia et al. | Identification of goaf instability under blasting disturbance using microseismic monitoring technology | |
| CN110579194B (en) | On-site testing method and application of fracture position of lateral basic roof rock beam of gob-side roadway | |
| CN109779634B (en) | Method for determining position of fractured hard top plate of coal mine ground vertical well | |
| Hu et al. | Study on evolution characteristics of regenerated roof structure in downward mining of Bifurcated coal seam | |
| Sakhno et al. | Field investigations of deformations in soft surrounding rocks of roadway with roof-bolting support by auger mining of thin coal seams | |
| Tian-xuan et al. | Optimization of goaf gas drainage parameters based on numerical simulation studying fracture in overlying strata | |
| CN111335900B (en) | High-strength anchoring and grouting self-tunneling method and system | |
| Hua et al. | Three-dimensional physical simulation and control technology of roof movement characteristics in non-pillar gob-side entry retaining by roof cutting | |
| Jiang et al. | Application Study on Active Advanced Support Technology in Deep Roadway under Mine Goaf | |
| Liu et al. | Research on control mechanism of surrounding rock of deep gob-side entry retaining | |
| CN105064985A (en) | Judging method for vertical shaft drilling process dynamic regulation on basis of slag material analysis | |
| CN113482600B (en) | One-hole dual-purpose method for coal field geological detection and mining rock stratum movement monitoring | |
| Guo et al. | Cause analysis and prevention of hole collapse by water injection and dust removal in Qi Panjing coal mine | |
| RU2498211C2 (en) | Method to perform blast-hole drilling | |
| CN108038282A (en) | Load transmission method for numerical simulation is exploited under a kind of unconsolidated confined aquifer | |
| Zhu et al. | Study on surrounding rock disturbance effect of multi-middle section combined backfilling mining in inclined iron ore | |
| Bao et al. | Deformation mechanism and treatment technology research of coal pillars in acute inclined goafs under expressway | |
| Peroulakis | Identification and strength classification of weakness zones in the Garpenberg mine based on measurement while drilling (MWD) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170308 |
|
| RJ01 | Rejection of invention patent application after publication |