CN111058468A - Method for rapidly reducing underground water in water-resisting layer in silty-fine sand geological layer - Google Patents
Method for rapidly reducing underground water in water-resisting layer in silty-fine sand geological layer Download PDFInfo
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- CN111058468A CN111058468A CN202010030350.8A CN202010030350A CN111058468A CN 111058468 A CN111058468 A CN 111058468A CN 202010030350 A CN202010030350 A CN 202010030350A CN 111058468 A CN111058468 A CN 111058468A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
A method for rapidly reducing underground water in a fine sand geological layer when meeting a water-resisting layer comprises the following steps: firstly, carrying out precipitation operation before excavating the earthwork of the underground pipe gallery; step two, after the well is formed, carrying out earth excavation on the underground pipe gallery, wherein the underground water level needs to be kept below the foundation surface of the foundation pit and is a water-resisting layer formed by silty clay; step three, building a temporary drainage ditch outside the slope top of the excavation side slope of the pipe gallery during drainage, wherein protective railings need to be arranged on two sides of the drainage ditch, and the drainage ditch needs to be subjected to anti-seepage treatment; fourthly, building a simple drainage ditch, draining the upper part of the waterproof layer to a lower region of the foundation pit, excavating a water collecting pit for collection, and then performing pumping drainage; and fifthly, performing light well point dewatering operation. The invention is completely suitable for the situation that the geological structure is composed of fine sand, silty clay and fine sand from top to bottom, and the pumping drainage is carried out by the method, thereby not only ensuring the rapid reduction of the underground water level, but also saving the construction cost.
Description
Technical Field
The invention relates to the technical field of underground pipeline construction, in particular to a method for quickly reducing underground water in a silty sand geological layer when meeting a water-resisting layer.
Background
In the fine sand geological layer (the geological structure is from top to bottom: miscellaneous loam, plain filling, fine sand, fine clay and fine sand), when all the main body mechanisms of the engineering pipe gallery of the utility tunnel are positioned below the underground water level, construction precipitation is required in the construction process, and the problem of construction precipitation is also the technical problem to be solved by the invention.
Disclosure of Invention
In view of the above technical problems, embodiments of the present invention provide a method for rapidly reducing groundwater in a silty sand geological formation in the presence of a water barrier, and particularly overcome the problem of groundwater reduction in the presence of a water barrier formed from silty clay in the process of groundwater reduction.
A method for rapidly reducing underground water in a fine sand geological layer when meeting a water-resisting layer comprises the following steps:
firstly, carrying out precipitation operation before excavating the earthwork of the underground pipe gallery;
step two, after the well is formed, after precipitation is carried out for 7-10 days, earth excavation of the underground pipe gallery is carried out, the underground water level needs to be kept below the foundation surface of the foundation pit, and a water-resisting layer formed by silty clay is formed, so that the follow-up operation of the underground pipe gallery is not influenced;
step three, building a temporary drainage ditch outside the slope top 5m of the excavated side slope of the pipe gallery when water is drained, wherein protective railings are needed to be arranged on two sides of the drainage ditch, and the drainage ditch needs to be subjected to anti-seepage treatment to prevent the side slope from collapsing due to water seepage of the ditch;
fourthly, building a simple drainage ditch, draining the upper part of the waterproof layer to a lower region of the foundation pit, excavating a water collecting pit for collection, and then performing pumping drainage, wherein the pumping drainage is performed by adopting a submersible pump in cooperation with a mud pump until no obvious water seepage exists at all the excavated parts;
and fifthly, performing light well point dewatering operation.
In the first step, the dewatering wells are arranged 1m away from the excavation slope top of the underground pipe gallery, the spacing between the dewatering wells outside the pit is 20-30 m, the well depth is considered according to 18-25 m, the pore-forming diameter of the dewatering wells is 800mm, the diameter of the concrete water filter pipes is 400mm, and the concrete water filter pipes and the well wall are filled with slag.
And step two, excavating and layering are carried out longitudinally, the excavating depth of each layer is not more than 4m, and water-carrying operation is strictly forbidden in the earth excavation process.
And step five, according to the field water seepage amount and the thickness of the water-resisting layer, the depth of the light well points is 2m, the light well points penetrate through the water-resisting layer, the distance is 2m, every 10 well points are connected with a self-sucking pump, and water is continuously pumped for 24 hours.
By using the method to reduce water, after 1 day, no obvious water seepage occurs in the foundation pit, after 2 days, the exploratory pit is excavated for inspection, and the underground water is already reduced to a water-resisting layer below the foundation surface of the pipe gallery, so that the earthwork excavation operation can be carried out.
Has the advantages that:
the method for pumping and draining is completely suitable for the situation that the geological structure is silty sand, silty clay and silty sand from top to bottom, not only can the underground water level be guaranteed to be quickly reduced, but also the construction cost can be saved.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is in no way limited to any specific configuration and algorithm set forth below, but rather covers any modification, replacement or improvement of elements, components or algorithms without departing from the spirit of the invention. In the following description, well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present invention.
Example embodiments will now be described with reference to the accompanying drawings, which may be embodied in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the invention.
The embodiment of the invention comprises the following steps:
firstly, carrying out precipitation operation before excavating earthwork of an underground pipe gallery, arranging precipitation wells 1m away from the excavation slope top of the underground pipe gallery, wherein the distance between the precipitation wells outside a pit is 20-30 m, the well depth is considered according to 18-25 m, the pore-forming diameter of the precipitation wells is 800mm, the diameter of concrete water filter pipes is 400mm, and the concrete water filter pipes and the well wall are filled with slag;
step two, after the well is formed, after precipitation is carried out for 7-10 days, underground pipe gallery earth excavation is carried out, excavation is carried out in a layered and longitudinal mode, the excavation depth of each layer is not more than 4m, water carrying operation is strictly forbidden in the earth excavation process, the underground water level needs to be kept below the foundation surface of the foundation pit and is formed by silty clay, and follow-up operation of the underground pipe gallery is not influenced;
step three, building a temporary drainage ditch outside the slope top 5m of the excavated side slope of the pipe gallery when water is drained, wherein protective railings are needed to be arranged on two sides of the drainage ditch, and the drainage ditch needs to be subjected to anti-seepage treatment to prevent the side slope from collapsing due to water seepage of the ditch;
fourthly, building a simple drainage ditch, draining the upper part of the waterproof layer to a lower region of the foundation pit, excavating a water collecting pit for collection, and then performing pumping drainage, wherein the pumping drainage is performed by adopting a submersible pump in cooperation with a mud pump until no obvious water seepage exists at all the excavated parts;
and fifthly, performing light well point dewatering operation, wherein the depth of the light well points is 2m and the light well points penetrate through a waterproof layer at intervals of 2m according to the field water seepage amount and the thickness of the waterproof layer, every 10 well points are connected with a self-sucking pump, and water is continuously pumped for 24 hours.
By using the method to reduce water, after 1 day, no obvious water seepage occurs in the foundation pit, after 2 days, the exploratory pit is excavated for inspection, and the underground water is already reduced to a water-resisting layer below the foundation surface of the pipe gallery, so that the earthwork excavation operation can be carried out.
Has the advantages that:
the method for pumping and draining is completely suitable for the situation that the geological structure is silty sand, silty clay and silty sand from top to bottom, not only can the underground water level be guaranteed to be quickly reduced, but also the construction cost can be saved.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to this embodiment will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
It will be appreciated by persons skilled in the art that the above embodiments are illustrative and not restrictive. Different features which are present in different embodiments may be combined to advantage. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art upon studying the specification and the claims. In the claims, the term "comprising" does not exclude other means or steps; the indefinite article "a" does not exclude a plurality; the terms "first" and "second" are used to denote a name and not to denote any particular order.
Claims (5)
1. A method for rapidly reducing underground water in a fine sand geological layer when meeting a water-resisting layer comprises the following steps:
firstly, carrying out precipitation operation before excavating the earthwork of the underground pipe gallery;
step two, after the well is formed, after precipitation is carried out for 7-10 days, earth excavation of the underground pipe gallery is carried out, the underground water level needs to be kept below the foundation surface of the foundation pit, and a water-resisting layer formed by silty clay is formed, so that the follow-up operation of the underground pipe gallery is not influenced;
step three, building a temporary drainage ditch outside the slope top 5m of the excavated side slope of the pipe gallery when water is drained, wherein protective railings are needed to be arranged on two sides of the drainage ditch, and the drainage ditch needs to be subjected to anti-seepage treatment to prevent the side slope from collapsing due to water seepage of the ditch;
fourthly, building a simple drainage ditch, draining the upper part of the waterproof layer to a lower region of the foundation pit, excavating a water collecting pit for collection, and then performing pumping drainage;
and fifthly, performing light well point dewatering operation.
2. The method of claim 1, wherein:
in the first step, the dewatering wells are arranged 1m away from the excavation slope top of the underground pipe gallery, the spacing between the dewatering wells outside the pit is 20-30 m, the well depth is considered according to 18-25 m, the pore-forming diameter of the dewatering wells is 800mm, the diameter of the concrete water filter pipes is 400mm, and the concrete water filter pipes and the well wall are filled with slag.
3. The method of claim 1, wherein:
and step two, excavating and layering are carried out longitudinally, the excavating depth of each layer is not more than 4m, and water-carrying operation is strictly forbidden in the earth excavation process.
4. The method of claim 1, wherein:
and step five, according to the field water seepage amount and the thickness of the water-resisting layer, the depth of the light well points is 2m, the light well points penetrate through the water-resisting layer, the distance is 2m, every 10 well points are connected with a self-sucking pump, and water is continuously pumped for 24 hours.
5. The method of claim 1, wherein:
and in the fourth step, the pumping and the drainage are carried out by adopting a submersible pump and a mud pump until no obvious water seepage exists at all the excavated parts.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010030350.8A CN111058468A (en) | 2020-01-13 | 2020-01-13 | Method for rapidly reducing underground water in water-resisting layer in silty-fine sand geological layer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010030350.8A CN111058468A (en) | 2020-01-13 | 2020-01-13 | Method for rapidly reducing underground water in water-resisting layer in silty-fine sand geological layer |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102345294A (en) * | 2010-08-04 | 2012-02-08 | 天津一建建筑工程有限公司 | Graded dewatering structure for soft-soil foundation deep-pit earthwork excavation |
| CN208152063U (en) * | 2018-04-27 | 2018-11-27 | 中建八局第三建设有限公司 | A kind of superelevation infiltration coefficient sand ovum stratum Groundwater Control system |
| CN208633235U (en) * | 2018-08-06 | 2019-03-22 | 司涛涛 | A kind of sandstone seepage well suitable for sponge urban construction |
| CN109972643A (en) * | 2019-05-06 | 2019-07-05 | 中国人民解放军空军工程大学 | A kind of region of FuShui base pit engineering Trinity joint precipitation system |
-
2020
- 2020-01-13 CN CN202010030350.8A patent/CN111058468A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102345294A (en) * | 2010-08-04 | 2012-02-08 | 天津一建建筑工程有限公司 | Graded dewatering structure for soft-soil foundation deep-pit earthwork excavation |
| CN208152063U (en) * | 2018-04-27 | 2018-11-27 | 中建八局第三建设有限公司 | A kind of superelevation infiltration coefficient sand ovum stratum Groundwater Control system |
| CN208633235U (en) * | 2018-08-06 | 2019-03-22 | 司涛涛 | A kind of sandstone seepage well suitable for sponge urban construction |
| CN109972643A (en) * | 2019-05-06 | 2019-07-05 | 中国人民解放军空军工程大学 | A kind of region of FuShui base pit engineering Trinity joint precipitation system |
Non-Patent Citations (2)
| Title |
|---|
| 祝显忠: "基坑井点降水施工", 《企业科技与发展》 * |
| 胡鸿志等: "特大型深基坑抽渗结合配合区域明排水的设计与施工", 《建筑技术》 * |
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Application publication date: 20200424 |
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