CN110318802A - Utilize the technology in gasification slag reparation backfill pit - Google Patents
Utilize the technology in gasification slag reparation backfill pit Download PDFInfo
- Publication number
- CN110318802A CN110318802A CN201910412653.3A CN201910412653A CN110318802A CN 110318802 A CN110318802 A CN 110318802A CN 201910412653 A CN201910412653 A CN 201910412653A CN 110318802 A CN110318802 A CN 110318802A
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- CN
- China
- Prior art keywords
- pit
- gasification slag
- side slope
- backfill
- reparation
- 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
- 239000002893 slag Substances 0.000 title claims abstract description 44
- 238000002309 gasification Methods 0.000 title claims abstract description 42
- 238000005516 engineering process Methods 0.000 title claims abstract description 15
- 235000013311 vegetables Nutrition 0.000 claims abstract description 18
- 239000004568 cement Substances 0.000 claims abstract description 14
- 239000002002 slurry Substances 0.000 claims abstract description 14
- 238000000280 densification Methods 0.000 claims abstract description 6
- 239000007921 spray Substances 0.000 claims abstract description 6
- 210000001364 upper extremity Anatomy 0.000 claims abstract description 6
- 230000008595 infiltration Effects 0.000 claims description 12
- 238000001764 infiltration Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 abstract description 18
- 238000000034 method Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 23
- 239000010410 layer Substances 0.000 description 12
- 239000003344 environmental pollutant Substances 0.000 description 6
- 231100000719 pollutant Toxicity 0.000 description 6
- 230000006641 stabilisation Effects 0.000 description 6
- 238000011105 stabilization Methods 0.000 description 6
- 230000005484 gravity Effects 0.000 description 5
- 239000003673 groundwater Substances 0.000 description 5
- 238000009491 slugging Methods 0.000 description 5
- 238000004062 sedimentation Methods 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/06—Filling-up mechanically
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The embodiment of the invention discloses the technologies using gasification slag reparation backfill pit, mainly comprise the steps that step 1: the smooth compacting in pit bottom, and are laid with certain thickness bed course densification on it, and conduction pipe is laid in bed course；Step 2: permeable hole is arranged in the vertical fixed support tube on bed course, support pipe outer wall, and support bottom of the tube is connected with conduction pipe；Step 3: squeezing into lateral spud pile in the side slope of pit, and spray cement slurry in side slope；Step 4: setting anti-seepage geomembrane in bed course and side slope upper berth；Step 5: gasification slag is imported into pit, is backfilled to pit, and backfills upper surface apart from pit upper limb 0.5-1m；Step 6: planting vegetable layer in pit upper end, vegetable layer is concordant with pit.The pit earth-filling method that the present invention uses, backfilling material is at low cost, and pit stability is strong after backfill, and is provided with vegetable layer on pit surface, backfilling material is combined together with pit, repairing effect is good.
Description
Technical field
The present embodiments relate to environment remediation technical fields, and in particular to utilizes the skill in gasification slag reparation backfill pit
Art.
Background technique
In coal and the recovery process of various mineral resources, big and small pit can be generated, and if these pits
It not can be carried out and timely backfill, water storage can be generated after rainfall, since water storage may bring landslide, infiltration, mud-rock flow etc. a variety of
Natural calamity has not only broken up original geology style and features, but also may jeopardize the person and property safety.
To solve the problems, such as that above-mentioned pit generates, people, which begin one's study, backfills pit.In the prior art, usually will
Solid waste is directly backfilling into pit, has a large amount of gap in backfilling material, can be under into the rainwater in pit
Infiltration enters underground water, and the pollutant in solid waste is brought into underground water, polluted water body environment.And in water body
In infitration process, collapsing for backfilling material in pit also will cause, affect the effect that pit backfill is repaired.
Therefore, how existing resource is utilized, optimizes pit backfilling process, improved the stability in backfill pit, be ability
Field technique personnel technical problem urgently to be resolved.
Summary of the invention
For this purpose, the embodiment of the present invention provide using gasification slag reparation backfill pit technology, with solve in the prior art by
Rainwater infiltration polluted underground water and backfilling material is caused to collapse caused by backfilling material has gap.
To achieve the goals above, the embodiment of the present invention provides the following technical solutions:
According to embodiments of the present invention, a kind of technology using gasification slag reparation backfill pit is provided, mainly includes following step
It is rapid:
Step 1: the smooth compacting in pit bottom, and it is laid with certain thickness bed course densification on it, it is laid with and leads in bed course
Flow tube road；
Step 2: the vertical fixed support tube on bed course, support pipe outer wall are arranged permeable hole, support bottom of the tube and diversion pipe
Road is connected；
Step 3: squeezing into lateral spud pile in the side slope of pit, and spray cement slurry in side slope；
Step 4: setting anti-seepage geomembrane in bed course and side slope upper berth；
Step 5: gasification slag is imported into pit, is backfilled to pit, and backfills upper surface apart from pit upper limb 0.5-
1m；
Step 6: planting vegetable layer in pit upper end, vegetable layer is concordant with pit.
It further, further include vertical dregs-blocking dam in step 3, vertical dregs-blocking dam is arranged in side slope, and vertical dregs-blocking dam
It is staggered with lateral spud pile.
Further, the cushion thickness is 30-50cm, compacting factor 0.9.
Further, the anti-seepage geomembrane with a thickness of 0.6-0.8mm, puncture intensity >=500N, infiltration coefficient≤0.8
×10-7cm/s。
Further, in the side slope cement slurry with a thickness of 10-15cm.
Further, the dregs-blocking dam is highly 1-1.5m with a thickness of 0.5-0.8m.
Further, the vegetable layer plantation high density turf and more root system shrubs.
The embodiment of the present invention has the advantages that
The rainwater entered in pit is retained by setting geomembrane, will not be seeped into underground water down, and rainwater
It is entered in support tube by the permeable hole on support tube, and enters further into conduction pipe and discharge, it is therefore prevented that rain
It is underwater to seep pollution of the pollutant to underground water in entrained gas slugging, protect groundwater environment；Support tube is provided in pit,
It is provided with lateral spud pile and vertical dregs-blocking dam in side slope, so as to enhance the interconnection of gasification slag and pit, prevents
Collapsing for gasification slag backfilling material, enhances the stability of pit backfilling material；The present invention carries out returning for pit using gasification slag
It fills out, not only reduces the influence caused by environment of gasification slag muck product, and also achieve the recycling and reusing of gasification slag.The present invention
The pit earth-filling method of use, backfilling material is at low cost, and pit stability is strong after backfill, and is provided with vegetation on pit surface
Layer, enables backfilling material to combine together with pit, repairing effect is good.
Specific embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book is understood other advantages and efficacy of the present invention easily, it is clear that described embodiment is the present invention one
Section Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
According to embodiments of the present invention, a kind of technology using gasification slag reparation backfill pit is provided, mainly includes following step
It is rapid:
Step 1: the basis by mechanical equipment to the smooth compacting in pit bottom, as hole hole bottom.And it is laid on it
Certain thickness bed course densification is general using with a thickness of 30-50cm, compacting factor 0.9, due to weight after preventing gasification slag from backfilling
Power causes to settle.Conduction pipe is laid in bed course, conduction pipe is mainly used for accepting the rainwater entered in pit, and rainwater is logical
Conduction pipe is crossed to discharge.
Step 2: being cleaned out firstly the need of by the rubble of mat surface, spine block etc., facilitate subsequent laying antiseepage geotechnique
Film.The vertical fixed support tube on bed course, specifically can be by modes fixed support tubes such as piling, and support pipe outer wall setting is permeable
Hole, permeable hole are of moderate size, and can either guarantee permeable effect, and can guarantee that gasification slag cannot enter branch by permeable hole
In stay tube.Support bottom of the tube is connected with conduction pipe, therefore the rainwater infiltration entered in gasification slag backfilling material enters
In support tube, water body then passes through gravity and enters in conduction pipe and discharge in support tube.To prevent rainwater from seeping
Underground water is seeped under pollutant in ventilative slugging, protects the stabilization of groundwater environment.
Step 3: lateral spud pile is squeezed into the side slope of pit, concrete stake, length can be used in specific transverse direction spud pile
It can be determined production as needed, general length uses 8-10m, lateral spud pile is squeezed into the length of half by pile driving equipment
Degree guarantees the stabilization of lateral spud pile.Further, and in side slope spray cement slurry, in the side slope cement slurry with a thickness of
10-15cm will form a protective layer after cement slurry is dry in side slope, prevent rainwater by seeping under side slope.
Step 4: setting anti-seepage geomembrane in bed course and side slope upper berth, by the way that anti-seepage geomembrane is arranged, the rainwater in pit is only
It can be seeped into down on geomembrane and be trapped, and have to enter into support tube and discharged.Anti-seepage geomembrane exists in order to prevent
Be destroyed when laying, the anti-seepage geomembrane with a thickness of 0.6-0.8mm, puncture intensity >=500N, infiltration coefficient≤0.8 ×
10-7cm/s。
Step 5: gasification slag is imported into pit, is backfilled to pit, and backfills upper surface apart from pit upper limb 0.5-
1m；
Step 6: planting vegetable layer in pit upper end, vegetable layer is concordant with pit, and the vegetable layer plants high density turf
With more root system shrubs.
It further, further include vertical dregs-blocking dam in step 3, vertical dregs-blocking dam is arranged in side slope, and vertical dregs-blocking dam
It is staggered with lateral spud pile.Further, the dregs-blocking dam is highly 1-1.5m with a thickness of 0.5-0.8m.
The method in gasification slag reparation backfill pit of the invention, the stability after capable of guaranteeing pit backfilling material, and prevent
Only there is rainwater infiltration to pollute underground water.
Embodiment 1
According to the technique and scheme of the present invention, a backfill pit is selected in Yulin Prefecture, Shaanxi Province, is named as No. 1 hole.No. 1
100 meters of diameter of hole, 50 meters of height.
A kind of technology using gasification slag reparation backfill pit is provided, is mainly comprised the steps that
Step 1: the basis by mechanical equipment to the smooth compacting in pit bottom, as hole hole bottom.And it is laid on it
Certain thickness bed course densification, using with a thickness of 50cm, compacting factor 0.9, since gravity causes after preventing gasification slag from backfilling
Sedimentation.Conduction pipe is laid in bed course, conduction pipe is mainly used for accepting the rainwater entered in pit, and rainwater passes through water conservancy diversion
Pipeline discharges.
Step 2: being cleaned out firstly the need of by the rubble of mat surface, spine block etc., facilitate subsequent laying antiseepage geotechnique
Film.The vertical fixed support tube on bed course, specifically can be by modes fixed support tubes such as piling, and support pipe outer wall setting is permeable
Hole, permeable hole are of moderate size, and can either guarantee permeable effect, and can guarantee that gasification slag cannot enter branch by permeable hole
In stay tube.Support bottom of the tube is connected with conduction pipe, therefore the rainwater infiltration entered in gasification slag backfilling material enters
In support tube, water body then passes through gravity and enters in conduction pipe and discharge in support tube.To prevent rainwater from seeping
Underground water is seeped under pollutant in ventilative slugging, protects the stabilization of groundwater environment.
Step 3: lateral spud pile is squeezed into the side slope of pit, concrete stake, length can be used in specific transverse direction spud pile
It can be determined production as needed, length uses 10m, lateral spud pile is squeezed into the length of half by pile driving equipment, protects
Demonstrate,prove the stabilization of lateral spud pile.Further, and in side slope spray cement slurry, in the side slope cement slurry with a thickness of 10cm,
After cement slurry is dry, a protective layer will be formed in side slope, prevent rainwater by seeping under side slope.
Step 4: setting anti-seepage geomembrane in bed course and side slope upper berth, by the way that anti-seepage geomembrane is arranged, the rainwater in pit is only
It can be seeped into down on geomembrane and be trapped, and have to enter into support tube and discharged.Anti-seepage geomembrane exists in order to prevent
Be destroyed when laying, the anti-seepage geomembrane with a thickness of 0.6-0.8mm, puncture intensity >=500N, infiltration coefficient≤0.8 ×
10-7cm/s。
Step 5: gasification slag is imported into pit, is backfilled to pit, and backfills upper surface apart from pit upper limb 0.5-
1m；
Step 6: planting vegetable layer in pit upper end, vegetable layer is concordant with pit, and the vegetable layer plants high density turf
With more root system shrubs.
After the slag that gasifies backfills No. 1 hole, after 1 year, to being detected at No. 1 hole.Detect the sedimentation 0.5 downwards of No. 1 hole
Rice, detection water quality are simultaneously unchanged.
Embodiment 2
According to the technique and scheme of the present invention, it selects another to backfill pit in Yulin Prefecture, Shaanxi Province, is named as No. 2 holes.2
Number hole 95 meters of diameter, height 52 meters.
A kind of technology using gasification slag reparation backfill pit is provided, is mainly comprised the steps that
Step 1: the basis by mechanical equipment to the smooth compacting in pit bottom, as hole hole bottom.And it is laid on it
Certain thickness bed course densification, using with a thickness of 50cm, compacting factor 0.9, since gravity causes after preventing gasification slag from backfilling
Sedimentation.Conduction pipe is laid in bed course, conduction pipe is mainly used for accepting the rainwater entered in pit, and rainwater passes through water conservancy diversion
Pipeline discharges.
Step 2: being cleaned out firstly the need of by the rubble of mat surface, spine block etc., facilitate subsequent laying antiseepage geotechnique
Film.The vertical fixed support tube on bed course, specifically can be by modes fixed support tubes such as piling, and support pipe outer wall setting is permeable
Hole, permeable hole are of moderate size, and can either guarantee permeable effect, and can guarantee that gasification slag cannot enter branch by permeable hole
In stay tube.Support bottom of the tube is connected with conduction pipe, therefore the rainwater infiltration entered in gasification slag backfilling material enters
In support tube, water body then passes through gravity and enters in conduction pipe and discharge in support tube.To prevent rainwater from seeping
Underground water is seeped under pollutant in ventilative slugging, protects the stabilization of groundwater environment.
Step 3: lateral spud pile is squeezed into the side slope of pit, concrete stake, length can be used in specific transverse direction spud pile
It can be determined production as needed, length uses 10m, lateral spud pile is squeezed into the length of half by pile driving equipment, protects
Demonstrate,prove the stabilization of lateral spud pile.Further, and in side slope spray cement slurry, in the side slope cement slurry with a thickness of 15cm,
After cement slurry is dry, a protective layer will be formed in side slope, prevent rainwater by seeping under side slope.It further include vertical dregs-blocking dam,
Vertical dregs-blocking dam is arranged in side slope, and vertical dregs-blocking dam and lateral spud pile are staggered.Further, the dregs-blocking dam is thick
Degree is 0.5m, is highly 1.5m.
Step 4: setting anti-seepage geomembrane in bed course and side slope upper berth, by the way that anti-seepage geomembrane is arranged, the rainwater in pit is only
It can be seeped into down on geomembrane and be trapped, and have to enter into support tube and discharged.Anti-seepage geomembrane exists in order to prevent
Be destroyed when laying, the anti-seepage geomembrane with a thickness of 0.6-0.8mm, puncture intensity >=500N, infiltration coefficient≤0.8 ×
10-7cm/s。
Step 5: gasification slag is imported into pit, is backfilled to pit, and backfills upper surface apart from pit upper limb 0.5-
1m；
Step 6: planting vegetable layer in pit upper end, vegetable layer is concordant with pit, and the vegetable layer plants high density turf
With more root system shrubs.
After the slag that gasifies backfills No. 2 holes, after 1 year, to being detected at No. 2 holes.Detect the sedimentation 0.1 downwards of No. 2 holes
Rice, detection water quality are simultaneously unchanged.
Therefore, it through the embodiment of the present invention it is found that carry out pit backfill by the technical solution of the invention, can protect substantially
Stability after demonstrate,proving pit backfill, and rainwater does not generate lower seep and impacts to underground water.
The embodiment of the present invention has the advantages that
The rainwater entered in pit is retained by setting geomembrane, will not be seeped into underground water down, and rainwater
It is entered in support tube by the permeable hole on support tube, and enters further into conduction pipe and discharge, it is therefore prevented that rain
It is underwater to seep pollution of the pollutant to underground water in entrained gas slugging, protect groundwater environment；Support tube is provided in pit,
It is provided with lateral spud pile and vertical dregs-blocking dam in side slope, so as to enhance the interconnection of gasification slag and pit, prevents
Collapsing for gasification slag backfilling material, enhances the stability of pit backfilling material；The present invention carries out returning for pit using gasification slag
It fills out, not only reduces the influence caused by environment of gasification slag muck product, and also achieve the recycling and reusing of gasification slag.The present invention
The pit earth-filling method of use, backfilling material is at low cost, and pit stability is strong after backfill, and is provided with vegetation on pit surface
Layer, enables backfilling material to combine together with pit, repairing effect is good.
Although above having used general explanation and specific embodiment, the present invention is described in detail, at this
On the basis of invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore,
These modifications or improvements without departing from theon the basis of the spirit of the present invention are fallen within the scope of the claimed invention.
Claims (7)
1. utilizing the technology in gasification slag reparation backfill pit, which is characterized in that mainly comprise the steps that
Step 1: the smooth compacting in pit bottom, and it is laid with certain thickness bed course densification on it, diversion pipe is laid in bed course
Road；
Step 2: the vertical fixed support tube on bed course, support pipe outer wall are arranged permeable hole, support bottom of the tube and conduction pipe phase
Connection；
Step 3: squeezing into lateral spud pile in the side slope of pit, and spray cement slurry in side slope；
Step 4: setting anti-seepage geomembrane in bed course and side slope upper berth；
Step 5: gasification slag is imported into pit, is backfilled to pit, and backfills upper surface apart from pit upper limb 0.5-1m；
Step 6: planting vegetable layer in pit upper end, vegetable layer is concordant with pit.
2. the technology as described in claim 1 using gasification slag reparation backfill pit, which is characterized in that in step 3, further include
Vertical dregs-blocking dam, vertical dregs-blocking dam are arranged in side slope, and vertical dregs-blocking dam and lateral spud pile are staggered.
3. the technology using gasification slag reparation backfill pit as described in claim 1, which is characterized in that the cushion thickness is
30-50cm, compacting factor 0.9.
4. the technology as described in claim 1 using gasification slag reparation backfill pit, which is characterized in that the anti-seepage geomembrane
With a thickness of 0.6-0.8mm, puncture intensity >=500N, infiltration coefficient≤0.8 × 10-7cm/s。
5. the technology as described in claim 1 using gasification slag reparation backfill pit, which is characterized in that cement in the side slope
Slurry is with a thickness of 10-15cm.
6. the technology as claimed in claim 2 using gasification slag reparation backfill pit, which is characterized in that the dregs-blocking dam thickness
It is highly 1-1.5m for 0.5-0.8m.
7. the technology as described in claim 1 using gasification slag reparation backfill pit, which is characterized in that the vegetable layer plantation
High density turf and more root system shrubs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910412653.3A CN110318802A (en) | 2019-05-17 | 2019-05-17 | Utilize the technology in gasification slag reparation backfill pit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910412653.3A CN110318802A (en) | 2019-05-17 | 2019-05-17 | Utilize the technology in gasification slag reparation backfill pit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110318802A true CN110318802A (en) | 2019-10-11 |
Family
ID=68113125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910412653.3A Pending CN110318802A (en) | 2019-05-17 | 2019-05-17 | Utilize the technology in gasification slag reparation backfill pit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110318802A (en) |
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|---|---|---|---|---|
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| CN104088637A (en) * | 2014-04-04 | 2014-10-08 | 太原理工大学 | Method for second mining of upper-group shallow residual coal under coal seam group conditions |
| CN204530729U (en) * | 2015-03-17 | 2015-08-05 | 宁波大学 | A kind of ecological protection device for greening side slope |
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| CN107347481A (en) * | 2017-07-10 | 2017-11-17 | 北京舜土规划顾问有限公司 | Casing charge for remittance earthing implant system and the method reclaimed using its outdoor pit body of progress |
| CN108178536A (en) * | 2018-03-09 | 2018-06-19 | 湖南科技大学 | A kind of method that step calcination coal gas slugging prepares cement with little clinker |
-
2019
- 2019-05-17 CN CN201910412653.3A patent/CN110318802A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2005126999A (en) * | 2005-08-26 | 2007-03-20 | Валентин Витаутасович Сенкус (RU) | METHOD FOR RECULTIVATION OF OPEN MINING |
| CN102817366A (en) * | 2012-08-13 | 2012-12-12 | 大同煤矿集团有限责任公司 | Prevention and treatment method for full-mechanized caving mining collapse trap area water disaster for shallow-buried ultra-thick coal seam |
| CN104088637A (en) * | 2014-04-04 | 2014-10-08 | 太原理工大学 | Method for second mining of upper-group shallow residual coal under coal seam group conditions |
| CN204530729U (en) * | 2015-03-17 | 2015-08-05 | 宁波大学 | A kind of ecological protection device for greening side slope |
| CN104818721A (en) * | 2015-03-24 | 2015-08-05 | 中国地质大学（北京） | Geological environment treatment method suitable for steep wall and deep pit type abandoned mine |
| CN106703050A (en) * | 2016-11-30 | 2017-05-24 | 中铁二院昆明勘察设计研究院有限责任公司 | Expansive soil road cutting side slope reinforced soil back-pressure seepage-preventive supporting structure and construction method thereof |
| CN107347481A (en) * | 2017-07-10 | 2017-11-17 | 北京舜土规划顾问有限公司 | Casing charge for remittance earthing implant system and the method reclaimed using its outdoor pit body of progress |
| CN108178536A (en) * | 2018-03-09 | 2018-06-19 | 湖南科技大学 | A kind of method that step calcination coal gas slugging prepares cement with little clinker |
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Application publication date: 20191011 |