CN109211754B - Coal rock permeability measuring device and method - Google Patents
Coal rock permeability measuring device and method Download PDFInfo
- Publication number
- CN109211754B CN109211754B CN201811146032.7A CN201811146032A CN109211754B CN 109211754 B CN109211754 B CN 109211754B CN 201811146032 A CN201811146032 A CN 201811146032A CN 109211754 B CN109211754 B CN 109211754B
- Authority
- CN
- China
- Prior art keywords
- pressure
- coal rock
- permeability
- grouting
- test block
- 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
- 239000003245 coal Substances 0.000 title claims abstract description 56
- 239000011435 rock Substances 0.000 title claims abstract description 56
- 230000035699 permeability Effects 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000012360 testing method Methods 0.000 claims abstract description 45
- 239000002002 slurry Substances 0.000 claims abstract description 30
- 238000007789 sealing Methods 0.000 claims abstract description 17
- 239000012466 permeate Substances 0.000 claims abstract description 4
- 239000011440 grout Substances 0.000 claims abstract description 3
- 239000011148 porous material Substances 0.000 claims abstract description 3
- 238000005259 measurement Methods 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 230000001133 acceleration Effects 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000035515 penetration Effects 0.000 claims description 3
- 210000003097 mucus Anatomy 0.000 claims 1
- 238000007569 slipcasting Methods 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract 1
- 238000005553 drilling Methods 0.000 description 4
- 238000013480 data collection Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000003566 sealing material Substances 0.000 description 3
- 238000005065 mining Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
Abstract
The utility model provides a coal rock permeability survey device, includes computer, data acquisition ware, slip casting pump, test block centre gripping and pressure add and hold device, pressure controller, slip casting pipe and a plurality of sensor, and the front end of slip casting pipe has set gradually the three-way valve, the check valve, the manometer, the sealing washer, the end of slip casting pipe has a plurality of grout outlets. A method for measuring permeability of coal rock, comprising: opening a test block adding and holding system, embedding a sensor, inserting a grouting pipe, closing the test block adding and holding system, switching on a grouting pump, starting a computer, adding a shaft pressure, confining pressure to a set value, starting the grouting pump, grouting to the set pressure, and collecting a pressure difference P when slurry permeates to the depth of a coal rock mass pore crack L t And time t. The coal rock permeability measuring device and method can realize the test of the permeability and the seepage field of any coal rock body and the determination of the permeability performance of any grouting material, and the output result of a computer is a permeability curve and the permeability, so that the experimental operation is simple and the result is reliable.
Description
Technical Field
The invention relates to determination of coal rock permeability, in particular to a device and a method suitable for underground coal rock permeability determination.
Background
The permeability of the rock and soil is always a research hot spot in the fields of domestic and foreign fluid mechanics, rock and soil mechanics, civil engineering, petroleum engineering, mining engineering and the like, and the attention of the permeability of the coal seam begins with the research on the gas emission of the in-situ coal seam. The permeability of the coal rock mass is an important parameter for preventing and controlling mine gas and mining coal bed gas, and the size of the permeability determines the difficulty of extraction; the seepage rule of the drilling sealing material in the coal-rock cracks has positive pushing effect on the research and development of the drilling sealing material. The existing coal and rock fracture laboratory device is mainly focused on the measurement of coal and rock mass permeability, and the accurate measurement of drilling sealing slurry seepage rules is rarely considered.
Disclosure of Invention
The invention aims to provide a device and a method for measuring the permeability curve of hole sealing slurry and other sealing slurries in a laboratory and the permeability of coal and rock mass, which are used for measuring the permeability curve of a drilling sealing material simultaneously on the basis of taking the scientific and dynamic measurement of the permeability of the coal and rock mass into consideration, so that the research depth of the current laboratory on the seepage rule of the hole sealing slurry is improved.
In order to achieve the above object, the present invention has the following technical scheme:
the utility model provides a coal rock permeability survey device, including computer, data collection station, grouting pump, test block centre gripping and pressure add and hold device, pressure controller, slip casting pipe and a plurality of sensor, test block centre gripping and pressure add and hold the device and link to each other with pressure controller, the grouting pump meets with the slip casting pipe, the front end of slip casting pipe has set gradually the three-way valve, the check valve, the manometer, the sealing washer, the end of slip casting pipe has a plurality of grout outlets, the sensor links to each other with data collection station, data collection station links to each other with the computer.
As a further improved counting scheme of the invention, the sensors are symmetrically distributed on two sides of the grouting pipe, two sensors are symmetrically distributed on two sides of each grouting opening, and the linear distance between the sensors on two sides of the grouting pipe and the grouting pipe is increased along a preset gradient.
As a further improved counting scheme of the invention, 13 sensors are respectively arranged at two sides of the grouting pipe.
As a further development of the counting method according to the invention, the slurry is a mixed liquid, a viscous liquid or a flexible paste.
A method for measuring permeability of coal and rock comprises the following steps,
s1: manufacturing a test block, and reserving grouting holes and sensor embedded measuring points on the test block;
s2: symmetrically burying the sensors into test blocks, connecting the sensors to a data acquisition device, and connecting the data acquisition device with a computer;
s3: fixing the test block on a test block clamping and pressure adding device, and connecting the test block clamping and pressure adding device to a pressure controller;
s4: inserting the grouting pipe into the test block, fixing the grouting pipe at the bottom end of the test block clamping and pressure holding device, screwing a sealing ring, closing a three-way valve, and connecting a grouting pump;
s5: adjusting the pressure controller to a set pressure;
s6: opening a grouting pump switch, opening a three-way valve, and injecting slurry into the test block through a grouting pipe;
s7: stopping grouting when the pressure gauge reaches the set pressure, and closing the three-way valve;
s8: collecting pressure difference P when slurry permeates to depth of coal rock mass pore gap L t And time t, calculating the permeability curve of the slurry and the permeability of the coal rock.
As a further improved counting scheme of the present invention, in the step S9, the permeation curve of the slurry and the permeability of the coal rock are calculated by the formula (1):
wherein, the penetration distance of the slurry is sealed at the moment L-t, m;
kinematic viscosity of mu-slurry, m 3 /s；
g-gravity acceleration, m/s 2 ；
Permeability coefficient of K-coal rock mass, mD,1 md= 9.8697 ×10 -16 m 2 ；
P t -pressure differential penetrating deep into the coal rock distance L;
C 1 -constants related to the coal rock mass and the external environmental conditions.
As a further improved counting scheme of the invention, the computer outputs data of depth L and pressure P penetrating into coal and rock mass at time t t The output graph is a graph L-Lnt with permeation curve L changing along with lnt or a graph P with pressure Pt changing along with Lnt t Lnt by the L-Lnt curve or P t the-Lnt curve obtains the permeation curve of the sealing slurry in the coal rock mass fracture, and the L-Lnt curve or P is calculated t The slope of the Lnt curve yields the permeability K of the coal rock.
Compared with the prior art, the invention has the beneficial effects that:
according to the coal rock permeability measuring device, the slurry seepage rules of the horizontal holes, the uplink holes and the downlink holes on site can be measured by adjusting the clamping directions of the test blocks such as the horizontal direction, the vertical direction and the specific angle; by adjusting different grouting pressures and loading different values of the confining pressure of the coaxial pressure, the method can realizeMeasuring a seepage rule more widely; the coal rock permeability is measured more accurately by adjusting the transverse distance and the vertical distance of the embedded test blocks of different sensors; the coal rock permeability determination method of the invention can also obtain an L-Lnt curve or P t Lnt curve, which can be passed through the L-Lnt curve or P with known slurry viscosity u t The permeability K of the coal rock mass is obtained through the slope of the-Lnt curve.
Drawings
FIG. 1 is a system diagram of a coal rock permeability measurement apparatus according to examples 1 and 2 of the present invention;
FIG. 2 is a diagram of a pressure applying and test block clamping system according to embodiments 1 and 2 of the present invention;
FIG. 3 is a diagram showing the grouting mode and the sensor embedding position of the coal rock mass test block in examples 1 and 2 of the present invention;
in fig. 1-3 above: the device comprises a 1-three-way valve, a 2-one-way valve, a 3-pressure gauge, a 4-sealing ring, a 5-grouting pipe, a 6-grouting outlet, a 7-test block, an 8-sensor, a 9-test block clamping and pressure adding and holding device, a 10-data acquisition device, an 11-pressure controller, a 12-computer and a 13-grouting pump.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings.
Example 1
1-3, a coal rock permeability measuring device comprises a computer 12, a data acquisition device 10, a grouting pump 13, a test block clamping and pressure adding device 9, a pressure controller 11, a grouting pipe 5 and a plurality of sensors 8. The test block clamping and pressure adding device 9 is connected with the pressure controller 11, the grouting pump 13 is connected with the grouting pipe 5, the front end of the grouting pipe 5 is sequentially provided with the three-way valve 1, the one-way valve 2, the pressure gauge-3 and the sealing ring 4, the tail end of the grouting pipe 5 is provided with a plurality of grouting outlets 6, the sensor 8 is connected with the data acquisition device 10, and the data acquisition device 10 is connected with the computer 12.
When the coal rock permeability is measured, the grouting pipe 5 extends into the test block 7, and the sensors 8 are symmetrically distributed on the test block 7 and are symmetrical to the grouting pipe 5. Each pulp outlet 6 is symmetrically provided with 2 sensors 8. The linear distance between the sensors 8 on both sides of the grouting pipe 5 and the grouting pipe 5 is increased along a certain gradient.
Example 2
A method of permeability measurement using the coal rock permeability measurement apparatus in example 1, comprising the steps of:
a. manufacturing a test block 7, and reserving grouting holes matched with the aperture of a grouting pipe 5 and 26 embedded measuring points of sensors 8 in the test block 7;
b. symmetrically embedding the sensors 8 into the test block 7, connecting the sensors 8 to the data acquisition device 10, opening the computer 12, and debugging parameters;
c. fixing the test block 7 on the test block clamping and pressure holding device 9, and connecting the test block clamping and pressure holding device 9 to the pressure controller 11;
d. the grouting pipe 5 is inserted into the test block 7 and is fixed at the bottom end of the test block clamping and pressure holding device 9, the sealing ring 4 is screwed, the three-way valve 1 is closed, and the grouting pump 13 is connected;
e. adjusting the pressure controller 11 to a set pressure;
f. opening the three-way valve 1, starting the grouting pump 13, and injecting slurry into the test piece 7 through the grouting pipe 5;
g. stopping grouting when the pressure gauge 3 shows that the set pressure is reached, and closing the three-way valve 1;
h. maintaining data synchronized by the measuring apparatus to the computer 12, e.g. pressure difference P at each measuring point t The time t for the sealing slurry to permeate to each station, and the permeation profile.
i. The holding pressure of the pressure controller 11 is removed, the three-way valve 1 is opened, the slurry is removed, the sealing ring 4 is unscrewed, the grouting pipe 5 is taken out, and the grouting pipe is cleaned.
The permeation curve of the slurry and the permeability of the coal rock are calculated by the formula (1):
wherein, the penetration distance of the slurry is sealed at the moment L-t, m;
kinematic viscosity of mu-slurry, m 3 /s；
g-gravity acceleration, m/s 2 ；
Permeability coefficient of K-coal rock mass, mD,1 md= 9.8697 ×10 -16 m 2 ；
P t -pressure differential penetrating deep into the coal rock distance L;
C 1 -constants related to the coal rock mass and the external environmental conditions;
the computer outputs data of depth L and pressure P penetrating into coal rock mass at time t t The output graph is a graph L-Lnt with permeation curve L changing along with lnt or a graph P with pressure Pt changing along with Lnt t Lnt by the L-Lnt curve or P t the-Lnt curve obtains the permeation curve of the sealing slurry in the coal rock mass fracture, and the L-Lnt curve or P is calculated t The slope of the Lnt curve yields the permeability K of the coal rock.
It is to be understood that the invention is not limited to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, all of which are intended to be included within the scope of the appended claims.
Claims (3)
1. The coal rock permeability measuring device is characterized by comprising a computer, a data acquisition device, a grouting pump, a test block clamping and pressure adding device, a pressure controller, a grouting pipe and a plurality of sensors, wherein the test block clamping and pressure adding device is connected with the pressure controller, the grouting pump is connected with the grouting pipe, the front end of the grouting pipe is sequentially provided with a three-way valve, a one-way valve, a pressure gauge and a sealing ring, the tail end of the grouting pipe is provided with a plurality of grout outlets, the sensors are connected with the data acquisition device, and the data acquisition device is connected with the computer; the sensors are symmetrically distributed on two sides of the grouting pipe, two sensors are symmetrically distributed on two sides of each grouting opening, and the linear distance between the sensors on two sides of the grouting pipe and the grouting pipe is increased along a preset gradient; the slurry is a mixed liquid, mucus or flexible paste.
2. The coal rock permeability measurement device according to claim 1, wherein 13 sensors are provided on both sides of the grouting pipe.
3. The method for measuring the permeability of coal rock according to claim 1 or 2, comprising the steps of,
s1: manufacturing a test block, and reserving grouting holes and sensor embedded measuring points on the test block;
s2: symmetrically burying the sensors into test blocks, connecting the sensors to a data acquisition device, and connecting the data acquisition device with a computer;
s3: fixing the test block on a test block clamping and pressure adding device, and connecting the test block clamping and pressure adding device to a pressure controller;
s4: inserting the grouting pipe into the test block, fixing the grouting pipe at the bottom end of the test block clamping and pressure holding device, screwing a sealing ring, closing a three-way valve, and connecting a grouting pump;
s5: adjusting the pressure controller to a set pressure;
s6: opening a grouting pump switch, opening a three-way valve, and injecting slurry into the test block through a grouting pipe;
s7: stopping grouting when the pressure gauge reaches the set pressure, and closing the three-way valve;
s8: collecting pressure difference P when slurry permeates to depth of coal rock mass pore gap L t And time t, calculating the permeation curve of the slurry and the permeability of the coal rock;
in the step S8, the permeation curve of the slurry and the permeability of the coal rock are calculated by the formula (1):
wherein, the penetration distance of the slurry is sealed at the moment L-t, m;
kinematic viscosity of mu-slurry, m 3 /s；
g-gravity acceleration, m/s 2 ；
Permeability coefficient of K-coal rock mass, mD,1 md= 9.8697 ×10 -16 m 2 ；
P t -pressure differential penetrating deep into the coal rock distance L;
C 1 -constants related to the coal rock mass and the external environmental conditions;
the computer outputs data of depth L and pressure P penetrating into coal rock mass at time t t The output graph is a graph L-Lnt with permeation curve L changing along with lnt or a graph P with pressure Pt changing along with Lnt t Lnt by the L-Lnt curve or P t the-Lnt curve obtains the permeation curve of the sealing slurry in the coal rock mass fracture, and the L-Lnt curve or P is calculated t The slope of the Lnt curve yields the permeability K of the coal rock.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811146032.7A CN109211754B (en) | 2018-09-29 | 2018-09-29 | Coal rock permeability measuring device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811146032.7A CN109211754B (en) | 2018-09-29 | 2018-09-29 | Coal rock permeability measuring device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109211754A CN109211754A (en) | 2019-01-15 |
| CN109211754B true CN109211754B (en) | 2023-10-31 |
Family
ID=64982352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811146032.7A Active CN109211754B (en) | 2018-09-29 | 2018-09-29 | Coal rock permeability measuring device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109211754B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111638170B (en) * | 2020-06-11 | 2021-09-21 | 中国矿业大学 | Two-way loading fractured rock visual fracturing grouting test device and method |
| CN112504920B (en) * | 2020-11-24 | 2022-09-09 | 天地科技股份有限公司 | Method for testing permeability of grouting slurry of surrounding rock of roadway |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175529A (en) * | 2011-01-26 | 2011-09-07 | 徐州师范大学 | Creep permeation full-distance coupling test system for broken rock sample |
| CN104237099A (en) * | 2014-08-29 | 2014-12-24 | 中国石油大学 | Device and method for determining radial permeability of compact rock core |
| CN204101419U (en) * | 2014-10-13 | 2015-01-14 | 山西省交通科学研究院 | Accurately can measure the measuring system of native infiltration coefficient |
| CN204302155U (en) * | 2014-12-03 | 2015-04-29 | 中国矿业大学 | Dynamic load effect coal body permeability detector |
| CN105067494A (en) * | 2015-07-10 | 2015-11-18 | 中国矿业大学 | Permeability testing method and device based on radial percolation experiment |
| CN206489045U (en) * | 2017-02-17 | 2017-09-12 | 中国地质大学（北京） | A kind of rock permeability anisotropy measurement device |
| KR101800383B1 (en) * | 2016-05-16 | 2017-11-23 | 동아대학교 산학협력단 | Isothermal and tri-axial pressure conditioned rock permeability measurement system |
| CN107525541A (en) * | 2017-08-04 | 2017-12-29 | 中国矿业大学 | A kind of hypotonicity coal and rock splitting infiltration coupling grouting experimental rig and method |
| CN107727527A (en) * | 2017-09-01 | 2018-02-23 | 浙江海洋大学 | A kind of system for determining the critical pressure gradient of foam generation at permeability mutation |
| WO2018129920A1 (en) * | 2017-01-12 | 2018-07-19 | 四川大学 | Sample component for radial permeability test of rock having extra-low permeability and test method therefor |
| CN209231167U (en) * | 2018-09-29 | 2019-08-09 | 中国矿业大学 | A kind of Permeability Oe Coal And Porous Rock And Fractured Rock measurement device |
-
2018
- 2018-09-29 CN CN201811146032.7A patent/CN109211754B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175529A (en) * | 2011-01-26 | 2011-09-07 | 徐州师范大学 | Creep permeation full-distance coupling test system for broken rock sample |
| CN104237099A (en) * | 2014-08-29 | 2014-12-24 | 中国石油大学 | Device and method for determining radial permeability of compact rock core |
| CN204101419U (en) * | 2014-10-13 | 2015-01-14 | 山西省交通科学研究院 | Accurately can measure the measuring system of native infiltration coefficient |
| CN204302155U (en) * | 2014-12-03 | 2015-04-29 | 中国矿业大学 | Dynamic load effect coal body permeability detector |
| CN105067494A (en) * | 2015-07-10 | 2015-11-18 | 中国矿业大学 | Permeability testing method and device based on radial percolation experiment |
| KR101800383B1 (en) * | 2016-05-16 | 2017-11-23 | 동아대학교 산학협력단 | Isothermal and tri-axial pressure conditioned rock permeability measurement system |
| WO2018129920A1 (en) * | 2017-01-12 | 2018-07-19 | 四川大学 | Sample component for radial permeability test of rock having extra-low permeability and test method therefor |
| CN206489045U (en) * | 2017-02-17 | 2017-09-12 | 中国地质大学（北京） | A kind of rock permeability anisotropy measurement device |
| CN107525541A (en) * | 2017-08-04 | 2017-12-29 | 中国矿业大学 | A kind of hypotonicity coal and rock splitting infiltration coupling grouting experimental rig and method |
| CN107727527A (en) * | 2017-09-01 | 2018-02-23 | 浙江海洋大学 | A kind of system for determining the critical pressure gradient of foam generation at permeability mutation |
| CN209231167U (en) * | 2018-09-29 | 2019-08-09 | 中国矿业大学 | A kind of Permeability Oe Coal And Porous Rock And Fractured Rock measurement device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109211754A (en) | 2019-01-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109459313B (en) | In-situ test method and system for mechanical behavior and seepage characteristics of coal rock mass | |
| CN103075148B (en) | On to the method for remotely drilling Fast Measurement coal-bed gas pressure and device thereof | |
| CN103411868B (en) | A kind of method of testing of Permeability Coefficent in Coal Seam | |
| CN103953390B (en) | The water-retaining production Tight filling method of control overlying mining rock crack and subsidence | |
| CN103075149B (en) | Method and device for quickly determining gas pressure of coal bed in downward superdeep borehole | |
| CN102243163B (en) | Quantitative evaluation method for permeability of faults of coal mine | |
| CN105628506A (en) | Rock fracture simulation sample and preparation method thereof, as well as simulation test device and simulation test method | |
| CN206627405U (en) | The double embolism original position injection pressure water penetration detectors of expansion type | |
| CN109211754B (en) | Coal rock permeability measuring device and method | |
| CN102536158B (en) | Uphole sealing method | |
| CN110006760A (en) | A kind of method that Accurate Determining deep hole water pressure blasting fracturing induces rupture reopening pressure | |
| CN203769707U (en) | Coal-seam-following borehole gas extracting and pressure measuring integrated hole sealing device | |
| CN104264719A (en) | Vacuum preloading indoor model testing apparatus | |
| CN109915070A (en) | The down-hole coal bed test gas pressure hole sealing device of one kind and method | |
| CN103290827B (en) | Mounting, burying and grouting method for multi-point displacement meter | |
| CN203822282U (en) | Confining pressure hydrofracture experimental facility | |
| CN102967687A (en) | Indoor fracturing grouting experiment system under bidirectional anisobaric condition | |
| CN203145925U (en) | Device for quickly measuring coal seam gas pressure by upward remote drilling | |
| CN112557279A (en) | Weathered bedrock hole-fracture vertical permeability testing device and method | |
| CN103674347B (en) | A kind of hollow soft elasticity inductor drilling hole stress sensor and detection method | |
| CN103147741A (en) | Coal bed roadside pressure relief zone width measuring system and method based on drill hole gas leakage | |
| CN209231167U (en) | A kind of Permeability Oe Coal And Porous Rock And Fractured Rock measurement device | |
| CN204301779U (en) | A kind of indoor deep hole grouting multi-parameter combined measuring instrument | |
| CN113653510B (en) | CO2Method for blocking rock stratum microcrack permeation by mineralized nano silica gel grouting material | |
| CN105181554A (en) | Waterproof test method for horizontal joint applying grouting layer |
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 |