CN109183868B - Method for treating dam foundation deep weathering capsule - Google Patents
Method for treating dam foundation deep weathering capsule Download PDFInfo
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- CN109183868B CN109183868B CN201810969855.3A CN201810969855A CN109183868B CN 109183868 B CN109183868 B CN 109183868B CN 201810969855 A CN201810969855 A CN 201810969855A CN 109183868 B CN109183868 B CN 109183868B
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- sand discharge
- weathering
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- sand
- discharge hole
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D37/00—Repair of damaged foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/40—Foundations for dams across valleys or for dam constructions
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a method for treating a dam foundation deep weathering pocket, which comprises the following steps of firstly, drilling sand discharge holes and water injection holes on a dam foundation to the top of the weathering pocket; secondly, respectively arranging a sleeve to the bottom of the hole in the sand discharge hole and the water injection hole; thirdly, arranging an air inlet pipe to the top of the weathering bag in the sleeve in the sand discharge hole, so that a sand discharge channel is formed between the inner wall of the sleeve and the outer wall of the air inlet pipe; injecting water into the water injection holes, wherein the water level in the water injection holes is higher than the top of the weathering bag, supplying air into the air inlet pipe, and discharging the sand layers of the weathering bag at the lower parts of the sand discharge holes from the sand discharge channel to the outside of the sand discharge holes; fifthly, continuously discharging sand along with the sinking of the sleeve and the air inlet pipe in the sand discharge hole until the bottom of the weathering bag; sixthly, when the sand discharge of one sand discharge hole is finished, circulating from the fourth step to the sixth step; seventhly, injecting concrete into the cavity after the weathering sac treatment through the sand discharge hole and the water injection hole; eighthly, performing consolidation grouting on the top and the bottom of the weathering bag. The invention has the advantages of simple construction method, small difficulty and low cost.
Description
Technical Field
The invention relates to a dam foundation reinforcing method in hydraulic engineering construction, in particular to a method for treating a weathering pocket in the deep part of a dam foundation.
Background
The weathering capsule is a common geological phenomenon developed in granite, has the characteristics of low strength and large deformation, and is easy to cause dam foundation leakage, deformation and damage when used as a dam foundation of a dam. With the development of economy, weathering cysts are inevitably encountered in engineering construction in granite areas, and therefore the weathering cysts must be treated to meet the design strength and anti-seepage requirements. At present, the weathering sacs are treated mainly by the following methods: 1. digging method: the excavation method is a treatment method of completely excavating weathering sacs and then backfilling concrete; the excavation method is generally suitable for treating weathering cysts with small burial depth, and the excavation method adopted for weathering cysts with large burial depth has extremely high engineering construction cost. 2. A consolidation method: the consolidation method is mainly characterized in that a consolidation material (generally cement yarn pulp or other chemical slurry) is poured into the weathering bag to consolidate the weathering bag, so as to meet the requirements of design strength and seepage prevention; the consolidation method generally requires slurry design tests before construction, including slurry selection and proportioning, field grouting consolidation tests and the like. The consolidation method can achieve good effects in aspects of treating dam foundation jointed rock mass and the like, but the ideal treatment effect on weathering cysts is often difficult to achieve, and the consolidation method is complex in construction design process and high in cost.
Disclosure of Invention
The invention aims to provide a method for treating a weathering pocket in the deep part of a dam foundation, which is simple in construction, small in difficulty and low in cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
the method for treating the weathering pocket in the deep part of the dam foundation comprises the following steps:
firstly, drilling a sand discharge hole and a plurality of water injection holes to the top of the weathering bag on the dam foundation by using a drilling machine, wherein the plurality of water injection holes are uniformly distributed around the sand discharge hole;
secondly, respectively arranging a sleeve to the bottom of the sand discharge hole and the water injection hole;
thirdly, arranging an air inlet pipe in the sleeve in the sand discharge hole to the top of the weathering bag; the outer diameter of the air inlet pipe is smaller than the inner diameter of the sleeve, so that a sand discharge channel is formed between the inner wall of the sleeve and the outer wall of the air inlet pipe;
fourthly, injecting water into the water injection holes, wherein the water level in the water injection holes is higher than the top of the weathering bag, and meanwhile, supplying air into the air inlet pipe by using an air compressor to discharge the weathering bag sand layer positioned at the lower parts of the sand discharge holes from the sand discharge channel to the outside of the sand discharge holes;
fifthly, as the cavity formed by the weathering bag sand layer at the lower part of the sand discharge hole is enlarged, the sleeve and the air inlet pipe in the sand discharge hole continue to discharge sand along with sinking until the bottom of the weathering bag;
sixthly, after the sand discharge of one sand discharge hole is finished, taking the adjacent sand discharge hole as the sand discharge hole and the previous sand discharge hole as the water injection hole, and circulating the steps from the fourth step to the sixth step until the whole weathering bag needing to be treated is treated;
seventhly, injecting concrete into the cavity after the weathering bag treatment through a sand discharge hole and a water injection hole until the cavity is full, and reserving an exhaust hole when the concrete is injected;
and eighthly, after the concrete is solidified, performing consolidation grouting on the top and the bottom of the weathering bag to ensure that the injected concrete and the dam foundation rock mass are completely integrated.
The inner diameter of the sleeve in the sand discharge hole is selected from phi 140mm to phi 160mm, and the outer diameter of the air inlet pipe is selected from phi 60mm to phi 80 mm.
The edge angle alpha =20 ° of the bottom end pipe wall of the air inlet pipe.
The invention has the advantages of simple construction method, small difficulty and low cost, provides a new idea and method for treating weathering cysts for other engineering projects, and has good development and application prospects.
Drawings
FIG. 1 is a schematic view of the construction process of the method of the present invention.
Fig. 2 is a schematic plan view of the sand discharge holes and the water injection holes according to the present invention.
Fig. 3 is a schematic structural view of the sand discharge hole of the present invention.
Detailed Description
The following describes embodiments of the present invention in detail with reference to the drawings, which are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are provided, but the scope of the present invention is not limited to the following embodiments.
As shown in FIGS. 1-3, the method for treating the deep weathering pocket of the dam foundation of the invention comprises the following steps:
firstly, drilling a sand discharge hole 1 and four water injection holes 2 on a dam foundation into a group by using a drilling machine, wherein multiple groups can be drilled according to the actual size of a weathering bag 3; the sand discharge holes 1 and the water injection holes 2 are drilled to the top of the weathering bag 3, the four water injection holes 2 are uniformly distributed around the sand discharge holes 1, the sand discharge holes 1 and the water injection holes 2 are drilled by diamond, and the diameters of the sand discharge holes 1 and the water injection holes 2 are phi 150 mm;
secondly, respectively arranging a sleeve 4 to the bottom of the sand discharge hole 1 and the water injection hole 2, wherein the outer diameter of the sleeve 4 is phi 146 mm;
thirdly, arranging an air inlet pipe 5 to the top of the weathering bag 3 in the sleeve 4 in the sand discharge hole 1, wherein the knife angle alpha of the pipe wall at the bottom end of the air inlet pipe 5 is =20 degrees, and the outer diameter of the air inlet pipe 5 is phi 80mm, so that a sand discharge channel 6 is formed between the inner wall of the sleeve 4 and the outer wall of the air inlet pipe 5;
fourthly, injecting water into the water injection holes 2, wherein the water level in the water injection holes 2 is higher than the top of the weathering bag 3, and simultaneously, utilizing an air compressor to send high-pressure air into the air inlet pipe 5, the air pressure is 1.0MPa, the air is sent for 2min every time, and the air supply quantity is 10m3The air supply interval is 3min, and the sand layer of the weathering bag 3 positioned at the lower part of the sand discharge hole 1 is discharged out of the sand discharge hole 1 from the sand discharge channel 6;
fifthly, as a cavity 7 formed by a weathering bag sand layer at the lower part of the sand discharge hole 1 is enlarged, the sleeve 4 and the air inlet pipe 5 in the sand discharge hole 1 continue to discharge sand along with sinking until the bottom of the weathering bag 3;
sixthly, after the sand discharge of one sand discharge hole 1 is finished, taking the adjacent water injection hole 2 as the sand discharge hole and the previous sand discharge hole as the water injection hole, and circulating the steps from the fourth step to the sixth step until the whole weathering bag 3 needing to be treated is treated;
seventhly, injecting concrete into the cavity 7 after the weathering bag treatment through the sand discharge holes 1 and the water injection holes 2 until the cavity is full, and reserving exhaust holes when the concrete is injected;
and eighthly, after the concrete is solidified, performing consolidation grouting on the top and the bottom of the weathering bag 3 to ensure that the injected concrete and the dam foundation rock mass are completely integrated.
The basic principle of the invention is to remove weathered sand in the weathered bag 3 according to Newton's second law and the basic theory of hydrodynamics, and then to pour back concrete for seepage prevention and reinforcement. The method comprises the steps of giving a certain wind pressure to weathered sand in the weathered bag 3 through drilling holes, blowing the weathered sand at the lower part of the air inlet pipe 5 by using high-pressure wind, discharging the weathered sand in the weathered bag 3 from the sand discharge channel 6 along with the high-pressure wind, and discharging the weathered sand at the air outlet of the air inlet pipe 5, the lower part of the sand discharge channel 6 and the surrounding. Along with the continuous discharge of the sand amount, a cavity 7 is formed at the air outlet of the air inlet pipe 5 and the lower part and the periphery of the sand discharge channel, and concrete grouting is performed after weathering sand in the weathering bag 3 is completely removed.
In the method, water is injected into the water injection hole 2 while the sand is discharged from the sand discharge hole 1. The interval of water injection hole 2 can be confirmed according to actual conditions, and the water injection purpose makes the sand between water injection hole 2 and the sand discharge hole 1 flow to the cavity of sand discharge hole 1 lower part to make 1 lower part cavity of sand discharge hole constantly increase, simultaneously, the water body of filling also can prevent that high-pressure wind from passing through the rock mass crack and discharging, in order to guarantee the pressure of high-pressure wind. The water level in the water injection hole 2 is higher than a certain height of the top of the weathering bag 3, so that a certain water pressure is formed between the water injection hole 2 and the sand discharge hole 1, and the flow of sand between the water injection hole 2 and the sand discharge hole 1 to the cavity below the sand discharge hole 1 is ensured.
Claims (2)
1. A method for treating a dam foundation deep weathering pocket, comprising: the method comprises the following steps: firstly, drilling a sand discharge hole and a plurality of water injection holes to the top of the weathering bag on the dam foundation by using a drilling machine, wherein the plurality of water injection holes are uniformly distributed around the sand discharge hole; secondly, respectively arranging a sleeve to the bottom of the sand discharge hole and the water injection hole; thirdly, arranging an air inlet pipe to the top of the weathering bag in the sleeve in the sand discharge hole, wherein the cutting edge angle alpha of the pipe wall at the bottom end of the air inlet pipe is =20 degrees; the outer diameter of the air inlet pipe is smaller than the inner diameter of the sleeve, so that a sand discharge channel is formed between the inner wall of the sleeve and the outer wall of the air inlet pipe; fourthly, injecting water into the water injection holes, wherein the water level in the water injection holes is higher than the top of the weathering bag, and meanwhile, supplying air into the air inlet pipe by using an air compressor to discharge the weathering bag sand layer positioned at the lower parts of the sand discharge holes from the sand discharge channel to the outside of the sand discharge holes; fifthly, as the cavity formed by the weathering bag sand layer at the lower part of the sand discharge hole is enlarged, the sleeve and the air inlet pipe in the sand discharge hole continue to discharge sand along with sinking until the bottom of the weathering bag; sixthly, after the sand discharge of one sand discharge hole is finished, taking the adjacent sand discharge hole as the sand discharge hole and the previous sand discharge hole as the water injection hole, and circulating the steps from the fourth step to the sixth step until the whole weathering bag needing to be treated is treated; seventhly, injecting concrete into the cavity after the weathering bag treatment through a sand discharge hole and a water injection hole until the cavity is full, and reserving an exhaust hole when the concrete is injected; and eighthly, after the concrete is solidified, performing consolidation grouting on the top and the bottom of the weathering bag to ensure that the injected concrete and the dam foundation rock mass are completely integrated.
2. The method of treating a dam foundation deep weathering pocket of claim 1, wherein: the inner diameter of the sleeve in the sand discharge hole is selected from phi 140mm to phi 160mm, and the outer diameter of the air inlet pipe is selected from phi 60mm to phi 80 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810969855.3A CN109183868B (en) | 2018-08-24 | 2018-08-24 | Method for treating dam foundation deep weathering capsule |
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| CN201810969855.3A CN109183868B (en) | 2018-08-24 | 2018-08-24 | Method for treating dam foundation deep weathering capsule |
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| CN109183868A CN109183868A (en) | 2019-01-11 |
| CN109183868B true CN109183868B (en) | 2020-12-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| MXNL06000051A (en) * | 2006-08-09 | 2008-02-08 | Jose Jaime Romero Sosa | Improved system for suctioning well water by a vacuum control process. |
| CN102720176B (en) * | 2012-06-28 | 2014-08-13 | 中国水利水电第七工程局成都水电建设工程有限公司 | Foundation strengthening treatment method |
| CN103967446B (en) * | 2013-02-04 | 2016-06-29 | 四川省地质工程勘察院 | Eddy flow sediment outflow well washing system |
| CN204327009U (en) * | 2014-12-11 | 2015-05-13 | 中铁十九局集团有限公司 | Surface dewatering deep well washing device |
| CN104612179B (en) * | 2014-12-31 | 2017-03-29 | 上海市机械施工集团有限公司 | Through the construction method of the diaphram wall of super thick silty sand ground |
| CN106639929A (en) * | 2016-11-18 | 2017-05-10 | 宁波锐德建筑设计咨询有限公司 | Rotational flow sand draining and well cleaning system |
| CN106498971A (en) * | 2016-12-08 | 2017-03-15 | 国网安徽省电力公司宣城供电公司 | A kind of easy disintegrating sandstone place base expanding and base expanding structure and its guard method in base expanding and base expanding face |
| KR101804978B1 (en) * | 2017-02-10 | 2017-12-06 | 주식회사 덕진엔지니어링 | assembled sediments separating method and apparatus for processing sediments including concomitants |
| CN107747317B (en) * | 2017-10-18 | 2023-06-02 | 中国电建集团华东勘测设计研究院有限公司 | Soft rock foundation impervious wall groove bottom sediment treatment method and soft rock foundation impervious wall groove bottom structure |
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Address after: 450003 Zhengzhou Jinshui Road, Henan, No. 109 Applicant after: YELLOW RIVER ENGINEERING CONSULTING Co.,Ltd. Address before: 450003 Zhengzhou Jinshui Road, Henan, No. 109 Applicant before: YELLOW RIVER ENGINEERING CONSULTING Co.,Ltd. |
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