CN111218928A - Consolidation treatment method for deep soft structural surface of dam foundation - Google Patents
Consolidation treatment method for deep soft structural surface of dam foundation Download PDFInfo
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- CN111218928A CN111218928A CN202010182166.5A CN202010182166A CN111218928A CN 111218928 A CN111218928 A CN 111218928A CN 202010182166 A CN202010182166 A CN 202010182166A CN 111218928 A CN111218928 A CN 111218928A
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- deep
- deep soft
- flushing
- grouting
- dam foundation
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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
- 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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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (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 consolidation processing method, in particular discloses a consolidation processing method for a deep soft structural surface of a dam foundation, and belongs to the technical field of foundation processing processes of hydraulic buildings. Provides a consolidation processing method for a deep soft structure surface of a dam foundation, which can obtain the dam foundation with better mechanical property. The consolidation processing method adopts the working procedures of cleaning and removing silt in the deep soft structure surface, and then pouring consolidated mortar into the deep soft structure surface to obtain the dam foundation deep structure surface with required performance.
Description
Technical Field
The invention relates to a consolidation treatment method, in particular to a consolidation treatment method for a deep soft structural surface of a dam foundation, belonging to the technical field of foundation treatment processes of hydraulic buildings.
Background
The method is generally difficult to treat the deep layer mud-sandwiched weak structural surface of the dam foundation, and due to the existence of mud on the weak structural surface, the grouting performance of the cement grouting of the structural surface is poor, and the effect of grouting on improving the mechanical parameters of the structural surface is generally poor. Therefore, if a better grouting effect is desired, more grouting methods must be studied.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provides a consolidation processing method for a deep soft structure surface of a dam foundation, which can obtain the dam foundation with better mechanical property.
The technical scheme adopted for solving the technical problems is as follows: a consolidation processing method for a deep soft structure surface of a dam foundation is characterized in that the deep soft structure surface of the dam foundation with required performance is obtained by adopting the procedures of cleaning and removing silt in the deep soft structure surface and then pouring consolidated mortar into the deep soft structure surface.
Furthermore, when the silt on the deep structure surface is cleaned, the cleaning water is filled in for cleaning.
The preferable mode of the scheme is that the silt cleaning of the deep-layer structure surface is carried out by filling cleaning water, wherein the steps are that firstly, a cleaning grouting hole and a cleaning drainage hole are drilled on the foundation surface to the deep-layer soft structure surface, then the cleaning water is continuously filled into the deep-layer soft structure surface through the cleaning grouting hole, and the cleaning water carrying the silt is discharged from the cleaning drainage hole until the discharged cleaning water does not carry the silt any more.
Furthermore, when drilling the flushing grouting hole and the flushing drain hole, the depth of the drilled and formed hole exceeds the deep soft structure surface by 0.5-1 meter.
The preferable mode of the scheme is that when the consolidation grouting is carried out, the grouted mortar is thick cement paste of which the ratio is 0.5: 1.
Further, when thick cement slurry is poured into the deep soft structural surface through the flushing grouting hole, gas in the deep soft structural surface is discharged through the flushing drainage hole, and after the cement slurry on the soft structural surface is fully filled, the flushing grouting hole and the flushing drainage hole are respectively sealed to complete the consolidation grouting process.
The preferable mode of the scheme is that the drill corresponding to the flushing and sand discharging hole is drilled at the tail end of the grouting section of the corresponding flushing and grouting hole.
The invention has the beneficial effects that: according to the consolidation processing method, silt cleaning water is poured into the deep soft structural surface to clean and remove silt in the deep soft structural surface, and then consolidated mortar is poured to obtain the dam foundation deep structural surface with required performance. Therefore, the deep soft structural surface is not provided with silt for reducing grouting performance, so that the grouting performance of the deep soft structural surface can be improved, and the mechanical parameters of the structural surface can be effectively improved.
Drawings
Fig. 1 is a schematic view of a deep soft structural surface of a dam foundation related to the consolidation processing method for the deep soft structural surface of the dam foundation of the present invention.
Labeled as: the deep soft structure surface 1, consolidation mortar 2, a flushing grouting hole 3 and a flushing drain hole 4.
Detailed Description
Fig. 1 shows a consolidation processing method for a deep soft structural surface of a dam foundation, which is provided by the invention and can obtain a good mechanical property. The consolidation processing method adopts the working procedures of firstly cleaning and removing the silt in the deep soft structural surface 1 and then pouring consolidated mortar 2 into the deep soft structural surface 1 to obtain the dam foundation deep structural surface with required performance. According to the consolidation processing method, silt cleaning water is poured into the deep soft structural surface to clean and remove silt in the deep soft structural surface, and then consolidated mortar is poured to obtain the dam foundation deep structural surface with required performance. Therefore, the deep soft structural surface is not provided with silt for reducing grouting performance, so that the grouting performance of the deep soft structural surface can be improved, and the mechanical parameters of the structural surface can be effectively improved.
In the above embodiment, in combination with the actual situation that a large amount of fresh water is inevitably present in the construction of the hydraulic and hydroelectric power engineering, and the situation that fresh water is adopted as an optimal preference in the washing, especially in the washing of fine particles such as silt, the present application adopts the mode of filling washing water to wash silt on the deep-layer structure surface. The concrete operation process is that when the washing water is filled in for carrying out the silt washing on the deep structure surface, the following steps are carried out, firstly, a washing grouting hole 3 and a washing drain hole 4 are drilled on the foundation surface to the deep soft structure surface respectively, then the washing water is continuously filled in the deep soft structure surface 1 through the washing grouting hole 3, and the washing water with silt is discharged from the washing drain hole 4 until the discharged washing water is not provided with silt any more; and when the flushing grouting holes 3 are used for injecting thick cement slurry into the deep soft structural surface 1, gas in the deep soft structural surface is discharged through the flushing drain holes 4, and after the cement slurry on the soft structural surface is fully filled, the flushing grouting holes 3 and the flushing drain holes 4 are respectively sealed to complete the consolidation grouting process.
Correspondingly, in order to improve the efficiency of washing and the effect of grout, when drilling system washing grout hole 3 and washing wash port 4, the degree of depth in the fashioned hole of drilling system surpasss deep soft structural plane 0.5 ~ 1 meter among the technical scheme that this application provided, moreover the drilling system that washes 4 correspondences of sediment outflow hole wash the end of 3 grout sections in grout hole correspondingly. Meanwhile, when consolidation grouting is carried out, the grouted mortar is thick cement paste with the ratio of 0.5: 1.
In conclusion, the invention relates to a method for treating a deep weak structural plane, belonging to the technical field of hydroelectric engineering.
The method mainly comprises the following steps:
a) drilling a flushing grouting hole on the foundation, wherein the depth of the drilling hole penetrates through a weak structural surface to be treated by 0.5-1.0 m;
b) drilling a flushing drain hole near the flushing grouting hole, wherein the depth of the hole exceeds the weak structural surface to be treated by 0.5-1.0 m;
c) flushing the soft structural surface through the flushing grouting hole by using high-pressure water, and flushing out fine particles such as mud filled in the soft structural surface through a flushing drain hole;
d) and after the soft structural surface is washed cleanly in the range between the washing grouting hole and the drain hole, grouting the soft structural surface through the washing grouting hole by adopting thick slurry, namely the ratio of 0.5: 1, exhausting gas by using the washing drain hole in the grouting process, and sealing the hole after ensuring that cement slurry on the soft structural surface is fully filled.
Claims (7)
1. A consolidation processing method for a deep soft structure surface of a dam foundation is characterized by comprising the following steps: the consolidation processing method adopts the working procedures of firstly cleaning and removing silt in the deep soft structure surface (1) and then pouring consolidated mortar (2) into the deep soft structure surface (1) to obtain the dam foundation deep structure surface with required performance.
2. The consolidation processing method for a deep soft structural surface of a dam foundation according to claim 1, wherein: when the silt on the deep structure surface is cleaned, cleaning water is filled in the deep structure surface for cleaning.
3. The consolidation processing method for a deep soft structural surface of a dam foundation according to claim 2, wherein: the method comprises the following steps of firstly drilling a flushing grouting hole (3) and a flushing drain hole (4) on a foundation surface towards a deep soft structure surface respectively, then continuously injecting cleaning water into the deep soft structure surface (1) through the flushing grouting hole (3), and discharging the cleaning water carrying silt from the flushing drain hole (4) until the discharged cleaning water does not carry silt any more.
4. The consolidation processing method for a deep soft structural surface of a dam foundation according to claim 3, wherein: when drilling the flushing grouting hole (3) and the flushing drain hole (4), the depth of the drilled and formed hole exceeds the deep soft structure surface by 0.5-1 m.
5. The consolidation processing method for a deep soft structural surface of a dam foundation according to any one of claims 1 to 4, wherein: when the consolidation grouting is carried out, the grouted mortar is concentrated cement paste with the ratio of 0.5: 1.
6. The consolidation processing method for a deep soft structural surface of a dam foundation according to claim 5, wherein: when thick cement slurry is poured into the deep soft structural surface (1) through the flushing grouting holes (3), gas in the deep soft structural surface is discharged through the flushing drainage holes (4), and after the soft structural surface is fully filled with cement slurry after grouting is finished, the flushing grouting holes (3) and the flushing drainage holes (4) are respectively sealed to finish the consolidation grouting process.
7. The consolidation processing method for a deep soft structural surface of a dam foundation according to claim 5, wherein: and the flushing sand discharge hole (4) is drilled at the tail end of the grouting section of the corresponding flushing grouting hole (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010182166.5A CN111218928A (en) | 2020-03-16 | 2020-03-16 | Consolidation treatment method for deep soft structural surface of dam foundation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010182166.5A CN111218928A (en) | 2020-03-16 | 2020-03-16 | Consolidation treatment method for deep soft structural surface of dam foundation |
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| CN111218928A true CN111218928A (en) | 2020-06-02 |
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| CN202010182166.5A Pending CN111218928A (en) | 2020-03-16 | 2020-03-16 | Consolidation treatment method for deep soft structural surface of dam foundation |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001311137A (en) * | 2000-04-28 | 2001-11-09 | Nittoc Constr Co Ltd | Cement grout supply method and device thereof |
| CN101654907A (en) * | 2009-09-11 | 2010-02-24 | 中国水利水电第九工程局有限公司 | High-flow high-speed jet plugging grouting technique under high-pressure water head of hydropower station |
| CN102900092A (en) * | 2012-09-24 | 2013-01-30 | 长江勘测规划设计研究有限责任公司 | Artificial composite foundation of concrete face rockfill dam built on deep and thick coverage layer and construction method of artificial composite foundation |
| CN104131575A (en) * | 2014-04-11 | 2014-11-05 | 中国水利水电第十一工程局有限公司 | Plugging and drainage method for dam foundation on karst highly developed stratum |
-
2020
- 2020-03-16 CN CN202010182166.5A patent/CN111218928A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001311137A (en) * | 2000-04-28 | 2001-11-09 | Nittoc Constr Co Ltd | Cement grout supply method and device thereof |
| CN101654907A (en) * | 2009-09-11 | 2010-02-24 | 中国水利水电第九工程局有限公司 | High-flow high-speed jet plugging grouting technique under high-pressure water head of hydropower station |
| CN102900092A (en) * | 2012-09-24 | 2013-01-30 | 长江勘测规划设计研究有限责任公司 | Artificial composite foundation of concrete face rockfill dam built on deep and thick coverage layer and construction method of artificial composite foundation |
| CN104131575A (en) * | 2014-04-11 | 2014-11-05 | 中国水利水电第十一工程局有限公司 | Plugging and drainage method for dam foundation on karst highly developed stratum |
Non-Patent Citations (2)
| Title |
|---|
| 长沙铁道学院工程系: "《铁路桥梁》", 31 August 1980 * |
| 顾志刚: "《水工工艺基础》", 31 December 2002 * |
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Application publication date: 20200602 |
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