CN114278300B - Method for repairing coal mining damaged water-proof soil layer through vacuum preloading of thin sand layer coverage area - Google Patents
Method for repairing coal mining damaged water-proof soil layer through vacuum preloading of thin sand layer coverage area Download PDFInfo
- Publication number
- CN114278300B CN114278300B CN202210105244.0A CN202210105244A CN114278300B CN 114278300 B CN114278300 B CN 114278300B CN 202210105244 A CN202210105244 A CN 202210105244A CN 114278300 B CN114278300 B CN 114278300B
- Authority
- CN
- China
- Prior art keywords
- soil layer
- water
- vacuum preloading
- coal mining
- layer
- 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
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to the field of mining engineering, in particular to a method for repairing a coal mining damaged water-proof soil layer by vacuum preloading of a thin sand layer coverage area, which adopts a vacuum preloading technology to enable cracks to tend to heal under the action of consolidation force. Simultaneously, the water and the solidifying material injected from the surface can further cause the cracks to be closed and solidified due to the water guiding effect of the cracks. Compared with the traditional vacuum preloading technology, the method avoids large-scale cracks on the partition, and prevents that more groundwater can not be extracted when vacuumizing. On the ending standard, the settlement is formed by two settlement types, one is soil layer fracture closure and the other is soil layer consolidation compression, so that the total settlement control has the standard after the consolidation compression amount is obtained by excluding the indoor simulation experiment for achieving the purpose of soil layer closure.
Description
Technical Field
The invention relates to the field of mining engineering, in particular to a method for repairing a coal mining damaged water-proof soil layer by vacuum preloading of a thin sand layer coverage area.
Background
The ecological environment in northwest areas of China is fragile, but the coal reserves are abundant and the burial is shallow, and particularly, after the precious ecological diving in a thin sand layer area damages the underlying water-proof soil layer, a large amount of ecological diving runs off to cause ecological degradation. Therefore, the method has great practical significance on the repair research of the coal mining damaged water-proof soil layer. At present, the repairing of the coal mining waterproof soil layer mainly comprises the control of coal mining technology and the water absorption and the bridging of soil layer minerals, and in addition, the repairing is carried out by adopting a grouting method, but the following problems exist in the prior art:
1) The soil layer has a long self-closing time, which reduces the ecological restoration efficiency.
2) Because the coal seam in northwest areas is shallow to be buried, the water-proof soil layer is closely communicated with the goaf, a large amount of slurry leakage phenomenon exists in grouting, the construction difficulty is high, and the cost is high.
3) At present, the soil body is treated by the vacuum preloading technology mainly by consolidating to improve the soil layer strength, and no related technology exists for repairing fracture healing of the coal mining fracture soil layer.
Disclosure of Invention
(one) solving the technical problems
The invention aims to solve the problem of the background technology and provides a method for repairing a water-proof soil layer of coal mining damage by vacuum preloading of a thin sand layer coverage area.
(II) technical scheme
A method for repairing a coal mining damaged water-proof soil layer by vacuum preloading of a thin sand layer coverage area comprises the following steps:
dividing a repair area after coal exploitation;
step two, arranging and implementing a drain board;
step three, acquiring soil layer parameters of a repair area;
embedding a sensor group in the soil layer;
fifthly, sealing the repair area;
step six, calculating the settlement of crack closure;
step seven, starting vacuum preloading and monitoring total sedimentation;
step eight, injecting part of the extracted water mixed curing material into the soil layer;
step nine, monitoring the water content of soil layer seeds;
step ten, ending the vacuum preloading when reaching the ending standard;
eleventh, withdrawing the device and sealing the space generated by the drain board;
step twelve, circularly completing the repair of all the subareas;
and step twelve, completing the repair of the water-proof soil layer.
Wherein, the liquid crystal display device comprises a liquid crystal display device,
in the first step, after coal exploitation, the repair area is divided into a plurality of areas to be repaired;
the regional division method is characterized in that the midpoints of two adjacent main earth surface cracks are divided as dividing lines, and the main earth surface cracks are cracks with the earth surface crack depth being more than 1 m;
step two, arranging and implementing the drain board in the subarea, and moving outwards for 1-2 m when the hidden crack is revealed in the implementing process of implementing the drain board until the hidden crack is not revealed;
the interval between the adjacent drain boards is 1-5 m;
step three, acquiring loess related parameters in the subareas;
drilling to obtain the thickness h of the soil layer after coal mining, sampling and testing the initial water content b of the soil layer, and comparing the drilling histogram before and after coal mining to obtain the soil layer crushing expansion coefficient a; and obtaining a loess sample;
embedding more than 3 water content sensor groups in soil layers in the subareas, wherein the sensors in each group are uniformly distributed in the vertical direction and are 0.5-2.5 m away from the drain board on a plane;
fifthly, sealing the surface or the underground of the subarea by adopting a polyethylene material at a certain depth, and reserving a water injection interface on a sealing material besides reserving a known vacuum pump interface;
the number of the water injection interfaces is the same as that of the drain boards, the water injection interfaces are in one-to-one correspondence, and the distance between the corresponding water injection interfaces and the drain boards is smaller than 2m;
the surface or groundwater with a certain depth is directly sealed on the ground when the thickness of the sand layer is less than 5m, and the sand layer which is reserved within 5m is excavated and sealed if the thickness of the sand layer is greater than 5m.
Step six, calculating settlement s1, s1= (a-1) x h generated by closing soil layer cracks in the subareas;
step seven, starting to pressurize the soil layer in the partition by a vacuum pump, and monitoring the settlement amount s2 in the partition;
the amount of settlement in the zone was monitored at least at 3 points and averaged as s2.
In the eighth step, vacuum pressurization is started in the subareas, water in the extracted soil layer is injected into the subareas again by 20% -60% through the water injection interface reserved in the fifth step, and a solidifying material is added into the extracted water, wherein the material is bacillus megaterium and a nutrient solution, and the nutrient solution is calcium chloride and urea;
wherein the mass ratio of the bacterial liquid to the nutrient solution is 1:1-1:2, and the mass ratio of the calcium chloride to the urea is 1:1.
In the ninth step, the moisture content of the soil layer is monitored through the moisture content sensor buried in the fourth step, and the monitoring frequency is 1 time per half hour to 1 time per 4 hours, so that the moisture content c of the final soil layer is achieved.
In the tenth step, the vacuum preloading in the subarea reaches the ending standard to end the vacuum preloading;
the standard for ending the vacuum preloading is as follows: s2=95% -105% (s1+s3), wherein s3 is settlement generated by soil consolidation, and loess obtained by the third step is obtained through simulation under the condition of the overburden pressure by an indoor simulation experiment according to the initial water content b, the final soil water content c and the consolidation time, wherein the overburden pressure is obtained through calculation of the formation and the density by the disclosure of a drilling histogram.
And in the eleventh step, evacuating the device in the partition for vacuum preloading, and backfilling and sealing the space generated by the drainage plate in the second step by adopting cement clay slurry.
In the step twelve, in each area divided in the step one, the steps two to eleven are circulated until the water-proof soil layer damaged by coal mining is repaired.
In the thirteenth step, after the water-proof soil layer is restored, the ecological diving is supplemented by atmospheric precipitation and underground water to gradually restore, and then the ecological system is perfected on the ground surface, so that the water-proof coal mining is realized.
(III) beneficial effects
The invention discloses a method for repairing a coal mining damaged water-proof soil layer by vacuum preloading of a thin sand layer coverage area, which has the following beneficial effects compared with the prior art: 1) The method is simple and easy to implement; 2) The cost is low; 3) The repairing effect is good; 4) Repair time is reduced relative to self-healing.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the invention is applied to a certain coal mine in northwest China, the mine surface sand layer is provided with a thin sand layer with the thickness of 4 m-6 m, the sand layer is provided with precious ecological diving, but the ecological diving disappears after coal exploitation, and the ecology is degraded. In order to restore ecological diving, the water-proof soil layer which is damaged by coal mining and is arranged below the sand layer is restored, and the process is as follows:
step one: and after coal exploitation, carrying out regional division on the repair area. The regional division method is to divide the midpoints of two adjacent main surface cracks into dividing lines. The main cracks refer to cracks with the surface crack depth being greater than 1 m. A coal face is divided into 14 sections, each section being generally perpendicular to the face mining direction and extending along the face.
Step two: and arranging and implementing the drain boards in the subareas, and moving outwards by 1-2 m when the hidden cracks are revealed in the implementing process of implementing the drain boards until the hidden cracks are not revealed. The interval between the adjacent drain boards is 1-5 m.
Step three: loess-related parameters are acquired in the region. The thickness h=40 meters of the soil layer after coal mining is obtained through drilling, the initial water content b=65% of the test soil layer is sampled, and the soil layer crushing expansion coefficient a=1.01 is obtained through comparing the column diagrams of the drilling holes before and after coal mining.
Step four: the soil layer in the partition is embedded with more than 3 water content sensor groups, each group of sensors is uniformly distributed in the vertical direction, and the distance between the sensors and the drain board is 0.5-2.5 m on the plane.
Step five: and excavating engineering machinery until a sand layer is reserved for 3m, sealing the surface of the earth in the subareas by adopting polyethylene materials, and reserving a water injection interface on a sealing material besides reserving a known vacuum pump interface. The number of the water injection interfaces is the same as that of the drain boards, the water injection interfaces are in one-to-one correspondence, and the distance between the corresponding water injection interfaces and the drain boards is smaller than 2m.
Step six: and calculating the settlement s1 generated by closing the soil layer cracks in the subareas. s1= (a-1) ×h=0.4 meters.
Step seven: the soil layer is pressurized by the vacuum pump, and the settlement s2 in the subarea is monitored. The amount of settlement in the zone was monitored at least at 3 points and averaged as s2.
Step eight: vacuum pressurizing is started in the subarea, water in the soil layer is pumped out, 20% -60% of water is injected again through a water injection interface reserved in the fifth step, and solidifying materials are added into the pumped out water, wherein the materials are bacillus megatherium and nutrient solution, and the nutrient solution is calcium chloride and urea. Wherein the mass ratio of the bacterial liquid to the nutrient solution is 1:1-1:2, and the mass ratio of the calcium chloride to the urea is 1:1.
Step nine: and (3) monitoring the water content of the soil layer in the subareas through the water content sensor buried in the step four, wherein the monitoring frequency is 1 time per half hour to 1 time per 4 hours, so that the water content of the final soil layer is c=41%.
Step ten: and (5) finishing the vacuum preloading when the vacuum preloading in the subarea reaches the finishing standard. The standard for ending the vacuum preloading in the subarea is as follows: s2=95% -105% (s1+s3), wherein s3 is settlement generated by soil consolidation, and loess obtained by the third step is obtained through simulation under the overburden pressure by using an indoor simulation experiment according to the initial water content b=65%, the final soil water content c=41% and the consolidation time, wherein the overburden pressure is obtained through calculation of the formation and the density through the borehole histogram. Calculated s3 is 0.4 meters. S2 is controlled to be 0.76-0.84 m.
Step eleven: and (3) evacuating the device in the partition for vacuum preloading, and backfilling and sealing the space generated by the drainage plate in the step two by adopting cement clay slurry.
Step twelve: and (3) in each partition divided in the step one, circulating the steps two to eleven until the water-proof soil layer damaged by coal mining is repaired.
Step thirteen: after the water-proof soil layer is restored, the ecological diving is supplemented by atmospheric precipitation and underground water to gradually restore, and then the ecological system is perfected on the ground surface, so that the water-proof coal mining is realized.
This patent is developed in the thin sand layer district because in limited sand layer coverage area, the restoration degree of depth of vacuum preloading is bigger. The vacuum preloading technology is generally applied to the aspect of stratum drainage consolidation reinforcement, and the vacuum preloading technology is adopted in this time to enable cracks to tend to heal under the action of consolidation force. Simultaneously, the water and the solidifying material injected from the surface can further cause the cracks to be closed and solidified due to the water guiding effect of the cracks. Compared with the traditional vacuum preloading technology, the method avoids large-scale cracks on the partition, and prevents that more groundwater can not be extracted when vacuumizing. On the ending standard, the settlement is formed by two settlement types, one is soil layer fracture closure and the other is soil layer consolidation compression, so that the total settlement control has the standard after the consolidation compression amount is obtained by excluding the indoor simulation experiment for achieving the purpose of soil layer closure.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (9)
1. The method for repairing the water-proof soil layer of the coal mining damage by vacuum preloading of the coverage area of the thin sand layer is characterized by comprising the following steps of:
dividing a repair area after coal exploitation;
step two, arranging and implementing a drain board;
step three, acquiring soil layer parameters of a repair area;
embedding a sensor group in the soil layer;
fifthly, sealing the repair area;
step six, calculating the settlement of crack closure;
step seven, starting vacuum preloading and monitoring total sedimentation;
step eight, injecting part of the extracted water mixed curing material into the soil layer;
step nine, monitoring the water content in the soil layer;
step ten, ending the vacuum preloading when reaching the ending standard;
eleventh, withdrawing the device and sealing the space generated by the drain board;
step twelve, circularly completing the repair of all the subareas;
thirteenth, finishing the repair of the water-proof soil layer;
in the first step, after coal exploitation, the repair area is divided into a plurality of areas to be repaired;
the regional division method is characterized in that the midpoints of two adjacent main surface cracks are divided as dividing lines, and the main surface cracks refer to cracks with the surface crack depth of more than 1 m;
arranging and implementing a drain board in the partition, and moving outwards by 1-2 m when the hidden crack is revealed in the implementing process of implementing the drain board until the hidden crack is not revealed;
the interval between adjacent drain boards is 1-5 m;
step three, acquiring loess related parameters in the subareas;
drilling to obtain the thickness h of the soil layer after coal mining, sampling and testing the initial water content b of the soil layer, and comparing the drilling histogram before and after coal mining to obtain the soil layer crushing expansion coefficient a; and obtaining a loess sample;
and fourthly, embedding more than 3 water content sensor groups in the soil layer in the subarea, wherein the sensors in each group are uniformly distributed in the vertical direction, and the distance between the sensors and the drainage plate is 0.5-2.5 m on a plane.
2. The method for repairing the water-proof soil layer of the coal mining damage by vacuum preloading of the coverage area of the thin sand layer according to claim 1, which is characterized in that in the fifth step, the surface or underground of a certain depth in a subarea is sealed by polyethylene materials, and besides a known vacuum pump interface is reserved, a water injection interface is reserved on a sealing material;
the number of the water injection interfaces is the same as that of the drain boards, the water injection interfaces are in one-to-one correspondence, and the distance between the corresponding water injection interfaces and the drain boards is smaller than 2m;
the surface or underground with a certain depth is directly sealed on the ground when the thickness of the sand layer is less than 5m, and the sand layer which is reserved within 5m is excavated and sealed if the thickness of the sand layer is greater than 5m.
3. The method for repairing the water-proof soil layer of the coal mining damage by vacuum preloading of the coverage area of the thin sand layer according to claim 1, wherein in the step six, the settlement amount s1, s1= (a-1) x h generated by closing the soil layer cracks in the subarea is calculated;
step seven, starting to pressurize the soil layer in the partition by a vacuum pump, and monitoring the settlement amount s2 in the partition;
the amount of settlement in the zone was monitored at least at 3 points and averaged as s2.
4. The method for repairing the water-proof soil layer of the coal mining damage by vacuum preloading of the coverage area of the thin sand layer according to claim 1, wherein in the eighth step, vacuum pressurization is started in a subarea, water in a soil layer is extracted, 20% -60% is injected again through a water injection interface reserved in the fifth step, and a solidifying material is added into the extracted water, wherein the material is bacillus megaterium and nutrient solution, and the nutrient solution is calcium chloride and urea;
wherein the mass ratio of the bacterial liquid to the nutrient solution is 1:1-1:2, and the mass ratio of the calcium chloride to the urea is 1:1.
5. The method for vacuum preloading restoration of a coal mining damaged water-resistant soil layer covered by a thin sand layer according to claim 3, wherein in the step nine, the moisture content of the soil layer is monitored by the moisture content sensor buried in the step four, and the monitoring frequency is 1 time per half hour to 1 time per 4 hours, so that the final moisture content of the soil layer is c=41%.
6. The method for repairing a coal mining damaged water-resistant soil layer by vacuum preloading of a thin sand layer covered area according to claim 5, wherein in the step ten, the vacuum preloading in a subarea reaches an ending standard to end the vacuum preloading;
the standard for ending the vacuum preloading is as follows: s2=95% -105% (s1+s3), wherein s3 is settlement generated by soil consolidation, and according to the initial water content b, the final soil water content c and the consolidation time, the loess sample obtained in the step three is utilized to carry out indoor simulation experiment and simulate and obtain related parameters under the overburden pressure, wherein the overburden pressure is obtained by revealing stratum and density calculation through a drilling histogram.
7. The method for repairing a damaged water-resistant soil layer by vacuum preloading in a thin sand layer covered area according to claim 1, wherein in the eleventh step, the device for vacuum preloading in the subarea is withdrawn, and the space produced by the second drainage plate is backfilled and sealed by cement clay slurry.
8. The method for repairing a damaged water-resistant soil layer by vacuum preloading of a thin sand covered area as claimed in claim 1, wherein in step twelve, in each zone divided in step one, steps two to eleven are circulated until the damaged water-resistant soil layer is repaired.
9. The method for repairing the water-proof soil layer of the coal mining damage by vacuum preloading of the coverage area of the thin sand layer according to claim 1, wherein in the thirteenth step, after the water-proof soil layer is repaired, the ecological system is perfected on the ground surface after the ecological diving is gradually recovered through atmospheric precipitation and groundwater replenishment, and the water-proof coal mining is realized.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210105244.0A CN114278300B (en) | 2022-01-28 | 2022-01-28 | Method for repairing coal mining damaged water-proof soil layer through vacuum preloading of thin sand layer coverage area |
| ZA2022/07935A ZA202207935B (en) | 2022-01-28 | 2022-07-18 | Method using vacuum preloading to repair waterproof soil layer damaged by mining coal in thin sand layer coverage area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210105244.0A CN114278300B (en) | 2022-01-28 | 2022-01-28 | Method for repairing coal mining damaged water-proof soil layer through vacuum preloading of thin sand layer coverage area |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114278300A CN114278300A (en) | 2022-04-05 |
| CN114278300B true CN114278300B (en) | 2023-09-15 |
Family
ID=80881816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210105244.0A Active CN114278300B (en) | 2022-01-28 | 2022-01-28 | Method for repairing coal mining damaged water-proof soil layer through vacuum preloading of thin sand layer coverage area |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN114278300B (en) |
| ZA (1) | ZA202207935B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115749784B (en) * | 2022-11-09 | 2023-08-11 | 文山麻栗坡紫金钨业集团有限公司 | Continuous drilling device for mining |
| CN115629191A (en) * | 2022-12-08 | 2023-01-20 | 河北地质大学 | Testing device and method applied to water-production type ground crack repair |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102776877A (en) * | 2012-08-22 | 2012-11-14 | 吉林大学 | Stepped vacuum drainage consolidation method for ultra-soft soil foundation |
| JP2017002681A (en) * | 2015-06-16 | 2017-01-05 | 五洋建設株式会社 | Vacuum consolidation method and drain material |
| CN106368207A (en) * | 2016-11-22 | 2017-02-01 | 陕西省地质环境监测总站 | Device and method for repairing ground cracks of coal mining loess subsidence area |
| CN108589694A (en) * | 2018-05-02 | 2018-09-28 | 中国铁道科学研究院深圳研究设计院 | Using the subway protection method of the vacuum preloading unloading tunnel overlying earthwork |
| CN108661644A (en) * | 2018-06-14 | 2018-10-16 | 陕西省地质环境监测总站 | A kind of water-protection coal-mining method reproducing clay pan using goaf negative pressure |
| CN110195430A (en) * | 2019-05-09 | 2019-09-03 | 深圳市中邦(集团)建设总承包有限公司 | A kind of anti-stacking pressure construction of soft soil treatment method of multidimensional sealing space vacuum water diversion |
| CN111676946A (en) * | 2020-06-22 | 2020-09-18 | 六盘水师范学院 | Loess coverage area coal mining ecological restoration method |
| CN113343417A (en) * | 2021-04-28 | 2021-09-03 | 中国矿业大学 | Reconstruction and restoration method for water-resisting layer and surface soil layer based on mining surface crack |
-
2022
- 2022-01-28 CN CN202210105244.0A patent/CN114278300B/en active Active
- 2022-07-18 ZA ZA2022/07935A patent/ZA202207935B/en unknown
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102776877A (en) * | 2012-08-22 | 2012-11-14 | 吉林大学 | Stepped vacuum drainage consolidation method for ultra-soft soil foundation |
| JP2017002681A (en) * | 2015-06-16 | 2017-01-05 | 五洋建設株式会社 | Vacuum consolidation method and drain material |
| CN106368207A (en) * | 2016-11-22 | 2017-02-01 | 陕西省地质环境监测总站 | Device and method for repairing ground cracks of coal mining loess subsidence area |
| CN108589694A (en) * | 2018-05-02 | 2018-09-28 | 中国铁道科学研究院深圳研究设计院 | Using the subway protection method of the vacuum preloading unloading tunnel overlying earthwork |
| CN108661644A (en) * | 2018-06-14 | 2018-10-16 | 陕西省地质环境监测总站 | A kind of water-protection coal-mining method reproducing clay pan using goaf negative pressure |
| CN110195430A (en) * | 2019-05-09 | 2019-09-03 | 深圳市中邦(集团)建设总承包有限公司 | A kind of anti-stacking pressure construction of soft soil treatment method of multidimensional sealing space vacuum water diversion |
| CN111676946A (en) * | 2020-06-22 | 2020-09-18 | 六盘水师范学院 | Loess coverage area coal mining ecological restoration method |
| CN113343417A (en) * | 2021-04-28 | 2021-09-03 | 中国矿业大学 | Reconstruction and restoration method for water-resisting layer and surface soil layer based on mining surface crack |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114278300A (en) | 2022-04-05 |
| ZA202207935B (en) | 2022-10-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114278300B (en) | Method for repairing coal mining damaged water-proof soil layer through vacuum preloading of thin sand layer coverage area | |
| CN103291325B (en) | The preventing control method of Coal-mining Above Confined-water floor strata gushing water | |
| CN2866610Y (en) | Water body prepressing loading structure for soft soil foundation | |
| Yang et al. | Pre-grouting reinforcement of underwater karst area for shield tunneling passing through Xiangjiang River in Changsha, China | |
| CN105041325A (en) | Construction method of high-tension water-rich extra-large-section weak breccia tunnel | |
| CN112593853B (en) | Construction method for coal mine waste filling and water-reducing mining | |
| CN110195430A (en) | A kind of anti-stacking pressure construction of soft soil treatment method of multidimensional sealing space vacuum water diversion | |
| CN113343417B (en) | Mining earth surface crack-based reconstruction and repair method for water-resistant layer and surface soil layer | |
| CN108915690B (en) | Novel method for preventing water gushing of vertical shaft well wall in vertical shaft aquifer tunneling | |
| CN105134219A (en) | Construction technology for freezing shaft lining in soft rock layer | |
| CN101575857A (en) | Landslide inflatable drainage treatment method | |
| CN108661644A (en) | A kind of water-protection coal-mining method reproducing clay pan using goaf negative pressure | |
| CN110241837A (en) | A kind of construction method for preventing basement bottom board from cracking under high artesian geological conditions | |
| CN107829747B (en) | Construction method suitable for shallow-buried underground excavation tunnel in expansive soil area | |
| CN114876572A (en) | Underground gas storage and site selection and transformation method thereof | |
| Gysel | Anhydrite dissolution phenomena: Three case histories of anhydrite karst caused by water tunnel operation | |
| CN111910665A (en) | Precipitation treatment method for steeply inclined strip-shaped interbedded composite stratum foundation pit | |
| CN210768905U (en) | Coal mining bottom plate dredging water simulation device | |
| CN109804833B (en) | Method for reducing damage of vegetation root system in mining area surface subsidence process | |
| Liu et al. | Prevention of mine-shaft failure by aquifer replenishment | |
| CN105134123A (en) | Differential water shut-off method by means of engineering expanding agent | |
| CN109457563B (en) | Red sandstone roadbed and construction method thereof | |
| He et al. | Study on stability of tunnel surrounding rock and precipitation disaster mitigation in flowing sand body | |
| CN112081125A (en) | Bottom sealing structure of foundation pit in submersible sandy gravel stratum and construction process | |
| Rahbar et al. | The design and construction of grouting against water ingress in the headrace tunnel for the Uma Oya Project, Sri Lanka |
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 |