CN102677704A - Method for preventing seepage of dam foundations of silt-rich rivers by means of natural coverage - Google Patents
Method for preventing seepage of dam foundations of silt-rich rivers by means of natural coverage Download PDFInfo
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- CN102677704A CN102677704A CN2012101658118A CN201210165811A CN102677704A CN 102677704 A CN102677704 A CN 102677704A CN 2012101658118 A CN2012101658118 A CN 2012101658118A CN 201210165811 A CN201210165811 A CN 201210165811A CN 102677704 A CN102677704 A CN 102677704A
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Abstract
The invention discloses a method for preventing seepage of dam foundations of silt-rich rivers by means of natural coverage. The method includes firstly stacking a dam model by loess loam center-deviated walls according to terrain and engineering geological conditions of a dam location and the integral arrangement requirements of pivotal projects and buildings; building the loess loam center-deviated walls by silt-rich loam in the thickness of 0.25m; secondly, paving climbing type inner coverage on a downstream slope of an upstream cofferdam in the vertical thickness of 6.0m, paving a filter material protecting layer in horizontal width of 4.0m and a transitional material protecting layer in horizontal width of 4.0m on two sides of the upstream cofferdam; and thirdly, building a cofferdam seepage-prevention structure of the upstream cofferdam serving the main part of the dam by the loam center-deviated walls, wherein the upstream slope gradient is 1:3.5 so that the dam can be directly conveniently tightly connected with the natural coverage formed by silt in front of the dam. In the method, the advantage that silt of the silt-rich rivers can form natural coverage in front of the dam is sufficiently utilized for design of the shape of the dam and the seepage-prevention design of the dam foundations, and accordingly, construction amount and construction investment of the dam foundations can be reduced evidently.
Description
Technical field
The present invention relates to fully-loaded stream seepage prevention of dam founda method, especially relate to the seepage prevention of dam founda method that fully-loaded stream utilizes natural bedding.
Background technology
For preventing dam foundation infiltration and seepage stability, when building the dam, must carry out antiseepage and handle the dam foundation.At present, the seepage prevention of dam founda processing method mainly comprised build concrete cut, basement rock grouting (curtain and consolidation grouting), or bedding etc. is set.But; For on fully-loaded stream, building the dam, how to utilize the silt of fully-loaded stream before the dam, to form these characteristics of natural bedding, the dam type and the seepage prevention of dam founda that carry out dam are optimized design; Reach and reduce dam foundation treatment project amount, reduction operating expenses, also be not seen in relevant report at present.
Summary of the invention
The object of the invention is to provide a kind of fully-loaded stream that reduces operating expenses, shortening construction period to utilize the seepage prevention of dam founda method of natural bedding.
For realizing above-mentioned purpose, the present invention takes following technical proposals:
Fully-loaded stream according to the invention utilizes the seepage prevention of dam founda method of natural bedding,
The first step, according to Dam Site landform and engineering geological conditions, hinge and each building general arrangement requirement, adopt loess class soil soil sloping core loose rock dam dam type; The loam sloping core adopts heavy silt loam to fill, and fills layer thickness 0.25m, adopts 17t projection vibratory roller vibroroller cmpacting, and degree of compaction is 100%;
Second goes on foot, on slope, upstream cofferdam downstream, lays bedding in the formula of swashing, the interior bedding vertical thickness 6.0m of the formula of swashing, and it respectively is filter material and the transition region material topping of 4.0m that horizontal width is laid in both sides; The interior bedding of the said formula of swashing adopts manual work to mix the gravelly soil of joining and fills; The percentage by weight of gravelly soil is mixed mixing ratio: heavy silt loam 30% and 70% maximum particle diameter are that the sand gravel fusion of the continuous grading of 60mm forms; Fill bed thickness 0.25m, adopt 17t projection vibratory roller vibroroller cmpacting, degree of compaction is 100%;
The 3rd step, the dam upstream cofferdam is the ingredient of dam dam body, adopts the leakage preventing structure of loam sloping core form as the weir body, its upper reaches gradient 1: 3.5 so that directly with the dam before the natural bedding of shoal materials formation closely be connected; So just, constituted bedding → one complete dam foundation auxiliary seepage proof system of loam sloping core in the natural bedding → upstream cofferdam sloping core → formula of swashing that forms by the silt alluvial, as the defence line, second road of seepage prevention of dam founda.
The present invention forms natural bedding owing to make full use of the silt of fully-loaded stream before the dam, carry out the dam type and the seepage prevention of dam founda design of dam, makes all purposes of remarkable minimizing of dam foundation treatment project amount and corresponding engineering investment thereby reach.
Simultaneously; The present invention can also utilize silt carrying flow that rock cranny is carried out shutoff; When silt carrying flow was oozed to the downstream, dam through the joint fissure in the rock mass, because joint fissure is very small in the rock mass, the silt in the infiltration current can be deposited in the slit gradually; It is stifled that leakage passage is become silted up, and causes water percolating capacity to reduce gradually.And along with the increase of deposition thickness before the dam, the permeable stratum leading edge is become silted up stifled gradually, thereby anti-seepage effect also will improve constantly.
Description of drawings
Fig. 1 is dam dam body, the seepage prevention of dam founda body generalized section of building according to the present invention.
The specific embodiment
As shown in Figure 1, fully-loaded stream according to the invention utilizes the seepage prevention of dam founda method of natural bedding, carries out according to following step:
The first step, according to Dam Site landform and engineering geological conditions, hinge and each building general arrangement requirement, adopt loess class soil soil sloping core loose rock dam dam type; The loam sloping core adopts heavy silt loam to fill, and fills layer thickness 0.25m, adopts 17t projection vibratory roller vibroroller cmpacting, and degree of compaction is 100%;
Second goes on foot, on slope, upstream cofferdam downstream, lays bedding in the formula of swashing, the interior bedding vertical thickness 6.0m of the formula of swashing, and it respectively is filter material and the transition region material topping of 4.0m that horizontal width is laid in both sides; The interior bedding of the said formula of swashing adopts manual work to mix the gravelly soil of joining and fills; The percentage by weight of gravelly soil is mixed mixing ratio: heavy silt loam 30% and 70% maximum particle diameter are that the sand gravel fusion of the continuous grading of 60mm forms; Fill bed thickness 0.25m, adopt 17t projection vibratory roller vibroroller cmpacting, degree of compaction is 100%; In the formula of swashing bedding overcome bedding in the existing employing level in the dam bottom artificial form that weak face causes slow down upstream dam slope, increase dam reclamation work amount and influence the problem of hinge general arrangement;
The 3rd step, the dam upstream cofferdam is the ingredient of dam dam body, adopts the leakage preventing structure of loam sloping core form as the weir body, its upper reaches gradient 1: 3.5 so that directly with the dam before the natural bedding of shoal materials formation closely be connected; So just, constituted bedding → one complete dam foundation auxiliary seepage proof system of loam sloping core in the natural bedding → upstream cofferdam sloping core → formula of swashing that forms by the silt alluvial; As the defence line, second road of seepage prevention of dam founda, the safety operating of guaranteeing dam has been increased insurance together again.
Claims (1)
1. a fully-loaded stream utilizes the seepage prevention of dam founda method of natural bedding, it is characterized in that:
The first step, according to Dam Site landform and engineering geological conditions, hinge and each building general arrangement requirement, adopt loess class soil soil sloping core loose rock dam dam type; The loam sloping core adopts heavy silt loam to fill, and fills layer thickness 0.25m, adopts 17t projection vibratory roller vibroroller cmpacting, and degree of compaction is 100%;
Second goes on foot, on slope, upstream cofferdam downstream, lays bedding in the formula of swashing, the interior bedding vertical thickness 6.0m of the formula of swashing, and it respectively is filter material and the transition region material topping of 4.0m that horizontal width is laid in both sides; The interior bedding of the said formula of swashing adopts manual work to mix the gravelly soil of joining and fills; The percentage by weight of gravelly soil is mixed mixing ratio: heavy silt loam 30% and 70% maximum particle diameter are that the sand gravel fusion of the continuous grading of 60mm forms; Fill bed thickness 0.25m, adopt 17t projection vibratory roller vibroroller cmpacting, degree of compaction is 100%;
The 3rd step, the dam upstream cofferdam is the ingredient of dam dam body, adopts the leakage preventing structure of loam sloping core form as the weir body, its upper reaches gradient 1: 3.5 so that directly with the dam before the natural bedding of shoal materials formation closely be connected; So just, constituted bedding → one complete dam foundation auxiliary seepage proof system of loam sloping core in the natural bedding → upstream cofferdam sloping core → formula of swashing that forms by the silt alluvial, as the defence line, second road of seepage prevention of dam founda.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101658118A CN102677704A (en) | 2012-05-25 | 2012-05-25 | Method for preventing seepage of dam foundations of silt-rich rivers by means of natural coverage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101658118A CN102677704A (en) | 2012-05-25 | 2012-05-25 | Method for preventing seepage of dam foundations of silt-rich rivers by means of natural coverage |
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| CN102677704A true CN102677704A (en) | 2012-09-19 |
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| CN2012101658118A Pending CN102677704A (en) | 2012-05-25 | 2012-05-25 | Method for preventing seepage of dam foundations of silt-rich rivers by means of natural coverage |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102864782A (en) * | 2012-10-22 | 2013-01-09 | 安蓉建设总公司 | Construction method for fast filling clay core rock-fill dam body |
| CN102979061A (en) * | 2012-12-04 | 2013-03-20 | 合肥工业大学 | Oblique membrane core wall earth and rockfill dam and anti-seepage body construction method thereof |
| CN106934169A (en) * | 2017-03-21 | 2017-07-07 | 中国电建集团成都勘测设计研究院有限公司 | A kind of method that natural impervious blanket layer Thickness Analysis are carried out using GOCAD |
| CN108193648A (en) * | 2018-03-19 | 2018-06-22 | 黄河勘测规划设计有限公司 | Plasticity panel homogeneous dam |
| CN108193649A (en) * | 2018-03-19 | 2018-06-22 | 黄河勘测规划设计有限公司 | Core-wall homogeneous dam |
-
2012
- 2012-05-25 CN CN2012101658118A patent/CN102677704A/en active Pending
Non-Patent Citations (4)
| Title |
|---|
| 梁会圃等: "小浪底大坝防渗土料质量指标及现场质量控制 ", 《岩土工程技术》 * |
| 梁会圃等: "小浪底大坝防渗土料质量指标及现场质量控制", 《岩土工程技术》, no. 06, 10 December 2002 (2002-12-10), pages 326 - 328 * |
| 王琳等: "小浪底水利枢纽工程大坝防渗效果分析 ", 《水电能源科学》 * |
| 王琳等: "小浪底水利枢纽工程大坝防渗效果分析", 《水电能源科学》, vol. 29, no. 10, 31 October 2011 (2011-10-31), pages 36 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102864782A (en) * | 2012-10-22 | 2013-01-09 | 安蓉建设总公司 | Construction method for fast filling clay core rock-fill dam body |
| CN102864782B (en) * | 2012-10-22 | 2014-10-29 | 安蓉建设总公司 | Construction method for fast filling clay core rock-fill dam body |
| CN102979061A (en) * | 2012-12-04 | 2013-03-20 | 合肥工业大学 | Oblique membrane core wall earth and rockfill dam and anti-seepage body construction method thereof |
| CN106934169A (en) * | 2017-03-21 | 2017-07-07 | 中国电建集团成都勘测设计研究院有限公司 | A kind of method that natural impervious blanket layer Thickness Analysis are carried out using GOCAD |
| CN108193648A (en) * | 2018-03-19 | 2018-06-22 | 黄河勘测规划设计有限公司 | Plasticity panel homogeneous dam |
| CN108193649A (en) * | 2018-03-19 | 2018-06-22 | 黄河勘测规划设计有限公司 | Core-wall homogeneous dam |
| CN108193648B (en) * | 2018-03-19 | 2023-08-22 | 黄河勘测规划设计研究院有限公司 | Plastic panel homogenizing dam |
| CN108193649B (en) * | 2018-03-19 | 2023-11-03 | 黄河勘测规划设计研究院有限公司 | Core wall homogenizing dam |
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Application publication date: 20120919 |