CN110886305A - Foundation pit water burst layered backfilling and plugging method based on protection karst water channel - Google Patents
Foundation pit water burst layered backfilling and plugging method based on protection karst water channel Download PDFInfo
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- CN110886305A CN110886305A CN201911088747.6A CN201911088747A CN110886305A CN 110886305 A CN110886305 A CN 110886305A CN 201911088747 A CN201911088747 A CN 201911088747A CN 110886305 A CN110886305 A CN 110886305A
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- water
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- foundation pit
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
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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
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
Abstract
The invention relates to a foundation pit water burst layered backfilling and plugging method based on a protective karst water channel, which comprises the following steps: when water gushes from the karst water dug to the interior of the foundation pit along the karst water channel, a permeable layer with water permeability is laid on the bottom surface of the foundation pit, then a water-resisting layer is laid above the permeable layer, and the gushing water is blocked.
Description
Technical Field
The invention relates to the technical field of underground construction engineering, in particular to a foundation pit water burst layered backfilling and plugging method based on a protective karst water channel.
Background
Along with the development of cities, engineering construction is continuously expanded to the underground, the underground engineering construction process is bound to face the problem of conflict with the karst water channel, and the plugging of underground water on the premise of protecting the karst water channel becomes one of the core problems of protecting spring water.
The inventor finds that at present, no related patent of invention is provided at home and abroad, a protective solution for solving the problem that underground engineering construction encounters a karst water runoff channel is provided, and forced precipitation, grouting plugging or foundation pit backfilling and other schemes are adopted in the actual construction process. The forced precipitation scheme has the problems of difficult precipitation, waste of underground water resources and the like; the grouting plugging scheme adopts composite double-liquid slurry, so that the water plugging effect is poor, and the groundwater quality is adversely affected; the backfill of the foundation pit can cause unrecoverable damage to the karst water channel; in conclusion, the conventional scheme has great influence on the groundwater quantity and the water quality, and can cause unrecoverable damage to the karst water channel, thereby possibly causing irreparable loss to the gushing of spring water.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a foundation pit water burst layered backfilling and plugging method based on a protective karst water channel, which can avoid the damage to the karst water channel and has remarkable social and economic benefits in the aspect of protecting the karst water channel.
In order to achieve the purpose, the invention adopts the following technical scheme:
a foundation pit water burst layered backfilling and plugging method based on a protective karst water channel comprises the following steps: digging to the inside karst water of foundation ditch along the karst water passageway when gushing water at the foundation ditch, lay the permeable bed that has the water permeability to the foundation ditch bottom surface, then lay the water barrier in the permeable bed top, carry out the shutoff to gushing water.
Because the permeable bed of karst water passageway top that the foundation ditch bottom surface exposes has the water permeability, the karst water can flow in the permeable bed, can not obstruct the normal flow of karst water in the karst water passageway, has reduced the influence of underground works construction to the karst water circulation.
Further, the foundation pit water burst layered backfill plugging method based on the protection karst water channel comprises the following specific steps:
step 1: and (5) recharging underground water into the foundation pit to keep the karst water stable and prevent the water level of the karst water from rising.
Step 2: and laying a permeable layer on the bottom surface of the foundation pit.
And step 3: and paving a water-resisting layer on the surface of the water-permeable layer.
Further, the permeable layer comprises a plurality of layers, and the layers are laid in a layered mode.
Furthermore, the multiple permeable layers are formed by paving graded broken stones, and the grain size of the broken stones is 1cm-4 cm.
Furthermore, in the two adjacent permeable layers, the permeable layer of the lower layer has better water permeability than the permeable layer of the upper layer.
Further, the water-resisting layer is made of a water-resisting steel plate.
Furthermore, the water-resisting layer is formed by pouring concrete.
Furthermore, the water-resisting layer is poured below the level of the recharged underground water, and the water-resisting layer is poured after the recharged underground water is not required to be subjected to precipitation.
And further, after the waterproof layer is laid, backfilling the foundation pit with concrete.
And further, pumping the recharge underground water in the foundation pit after the waterproof layer is laid, and building an engineering structure required to be built by underground engineering.
The invention has the beneficial effects that:
1. according to the method for backfilling the water burst layers of the karst water channel foundation pit, the permeable layer is laid above the karst water channel exposed at the bottom surface of the foundation pit, so that karst water can circulate in the permeable layer, the original karst water channel damaged during foundation pit excavation is compensated, the normal flow of the karst water is ensured, the influence on the water quality of the karst water is reduced, the influence of underground engineering construction on the karst water is reduced, the damage to the karst water channel is avoided, the water barrier is laid above the permeable layer, the re-water burst of the karst water is avoided, and the remarkable social benefit and economic benefit are achieved in the aspect of protecting the karst water channel.
2. According to the method for backfilling the foundation pit water burst layer of the karst water channel, the permeable layer adopts graded broken stones and can be used as a bearing layer of an engineering structure required to be built by underground engineering in the foundation pit.
3. According to the method for backfilling the water burst layer of the karst water channel foundation pit, before the water-resisting layer is laid, water in the foundation pit does not need to be drained and reduced, the water-resisting layer is poured below the water level, and waste of underground water resources is avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic diagram of a karst water channel exposed by excavation of a foundation pit;
FIG. 2 is a schematic diagram of example 1 after completion of step 1;
FIG. 3 is a schematic diagram of example 1 after completion of step 2;
FIG. 4 is a schematic diagram of example 1 after completion of step 3;
FIG. 5 is a schematic diagram of an engineering structure built in a foundation pit after completion of karst water gushing treatment in embodiment 1 of the present invention;
the construction method comprises the following steps of 1, a foundation pit, 2, an enclosure structure, 3, a transverse supporting beam, 4, a karst water channel, 5, underground water, 6, a permeable layer, 7, a water-resisting layer and 8, and is characterized by comprising the following steps of.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
For convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate correspondence with up, down, left and right directions of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
As introduced by the background art, in the existing foundation pit construction process, when karst water gushes out, grouting is adopted to plug the karst water, so that adverse effects are caused to underground water quality, and irrecoverable damage can be caused to a karst water channel.
As shown in fig. 1, when a foundation pit 1 is excavated, an enclosure structure 2 is erected on a pit wall of the foundation pit, a transverse supporting beam 3 is used for supporting the enclosure structure, when the foundation pit is excavated to a certain depth, a karst water channel 4 is exposed, and the condition of karst water gushing occurs, in embodiment 1 of a typical embodiment of the present application, a foundation pit water gushing layered backfill plugging method based on protection of the karst water channel is provided, which is used for rapidly dealing with the above condition, as shown in fig. 2-5, and comprises the following specific steps:
step 1: and (3) recharging the underground water 5 in the foundation pit, wherein the water level of the recharge water in the foundation pit is raised to the karst water to keep stable, and the water level of the karst water is not raised any more.
In the step, a set amount of underground water can be recharged in the foundation pit, recharging is stopped, whether the water level of the underground water continuously rises or not is observed, if the water level of the underground water continuously rises, the underground water is recharged continuously until the water level of the recharged underground water does not rise any more after the groundwater recharging is stopped, and then the karst water is considered to reach a stable state and the water level of the karst water does not rise any more.
Step 2: lay the permeable bed 6 that has the water permeability at the bottom surface of foundation ditch, the permeable bed has the multilayer, and the layering is laid, and the permeable bed is laid by the size of particle diameter for 1cm-4 cm's gradation rubble and forms, the gradation rubble adopts slice stone or rubble or lump stone or cobble stone etc. the mixing of rubble is joined in marriage to the field technical personnel can select one or more gradation according to actual need to lay the permeable bed.
In two adjacent permeable floors, the rubble particle diameter of the permeable floor that is located the below is greater than the rubble particle diameter of the permeable floor of top, and the water permeability of the permeable floor of lower floor is superior to the water permeability of the permeable floor of upper strata promptly.
The permeable bed is by supreme down, and the water permeability reduces gradually, when satisfying that the karst water can flow, has prevented that the karst water from upwards flowing and causing gushing water.
The thickness of the permeable layer is determined by calculation according to the water inflow and the water head height of the karst water, and the thickness of the permeable layer cannot influence the permeation efficiency of the karst water. The calculation process is only required to adopt the existing theoretical calculation, and the specific calculation method is not described in detail here.
And step 3: the top surface of permeable bed is laid by water barrier 7 for the gushing water of shutoff karst water, the water barrier adopts concrete placement to form, during the pouring, adopts the groundwater level below the pouring in the foundation ditch to pour, need not to take out the water in the foundation ditch dry and carry out the pouring of water barrier promptly, has avoided the waste of groundwater resource.
In this embodiment, the permeable bed that constitutes by the rubble is laid to karst water passageway top that exposes, the karst water of gushing can flow in the permeable bed, the permeable bed has compensated the karst water passageway part that destroys because of excavating the foundation ditch, do not destroy the flow of karst water, and utilize the water barrier, can effectively carry out the shutoff to karst water, the gushing water that has prevented karst water to the top has, when carrying out the shutoff to karst water, the normal flow of destruction karst water has been avoided, thereby the irrecoverable destruction that causes the karst water passageway has been avoided.
Meanwhile, the karst water flows in the permeable layer paved by the broken stones, and the influence on the water quality is small.
The water-resisting layer can also be made of steel plates, and the steel plates are directly paved on the water-permeable layer and used for blocking gushing water of karst water.
And after the waterproof layer is laid, if the foundation pit is not applied in the underground engineering construction, backfilling the foundation pit by using concrete.
After the waterproof layer is laid, if the foundation pit needs to be applied in the underground engineering construction, the reinjection water in the foundation pit is drained, an engineering structure 8 needed by the underground engineering is set up on the waterproof layer after the water in the foundation pit is drained, the engineering structure is set up according to actual needs, and the specific structure of the engineering structure is not described in detail herein.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. A foundation pit water burst layered backfilling and plugging method based on a protective karst water channel comprises the following steps: its characterized in that digs when taking place to gush water to the inside karst water of foundation ditch along the karst water passageway at the foundation ditch, lays the permeable bed that has the water permeability to the foundation ditch bottom surface, then lays the water barrier in the permeable bed top, carries out the shutoff to gushing water.
2. The foundation pit water burst layered backfill plugging method based on the protection karst water channel as claimed in claim 1, characterized by comprising the following specific steps:
step 1: recharging underground water into the foundation pit to keep the karst water stable and prevent the water level of the karst water from rising;
step 2: paving a permeable layer on the bottom surface of the foundation pit;
and step 3: and paving a water-resisting layer on the surface of the water-permeable layer.
3. The backfill plugging method for water inrush delamination of foundation pit based on the protection of karst water channel as claimed in claim 1, wherein the permeable layer comprises a plurality of layers, and the layers are laid.
4. The method for backfilling and plugging water burst layers of foundation pits based on the protection of karst water channels according to claim 3, wherein the multiple water permeable layers are laid by graded crushed stones, and the particle size of the crushed stones is 1cm-4 cm.
5. The method for backfill plugging of water gushing layer of foundation pit based on protection of karst water channel as claimed in claim 3, wherein the water permeability of the lower permeable layer is better than that of the upper permeable layer in two adjacent permeable layers.
6. The foundation pit water burst layered backfill plugging method based on the protection karst water channel is characterized in that the water barrier is made of water-barrier steel plates.
7. The foundation pit water burst layered backfill plugging method based on the protection karst water channel as claimed in claim 1, wherein the water-resisting layer is formed by pouring concrete.
8. The foundation pit water burst layered backfill plugging method based on the protection karst water channel is characterized in that the water barrier is poured below the level of the groundwater for recharging.
9. The method for backfilling and plugging water burst layers of the foundation pit based on the protection of the karst water channel according to claim 1, wherein after the water-resisting layer is laid, the foundation pit is backfilled with concrete.
10. The foundation pit water burst layered backfilling and plugging method based on the protection karst water channel according to claim 1, characterized in that after the water-resisting layer is laid, the backfilling underground water in the foundation pit is pumped out, and an engineering structure required to be built by underground engineering is built.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911088747.6A CN110886305B (en) | 2019-11-08 | 2019-11-08 | Foundation pit water burst layered backfilling and plugging method based on protection karst water channel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911088747.6A CN110886305B (en) | 2019-11-08 | 2019-11-08 | Foundation pit water burst layered backfilling and plugging method based on protection karst water channel |
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| CN110886305A true CN110886305A (en) | 2020-03-17 |
| CN110886305B CN110886305B (en) | 2021-05-07 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3716292A1 (en) * | 1987-05-15 | 1988-11-24 | Thosti Boswau Wtb Bau Ag | Method and arrangement for constructing a diaphragm wall |
| CN108978679A (en) * | 2018-07-04 | 2018-12-11 | 山西太钢不锈钢股份有限公司 | A kind of method that cable tunnel is constructed in high water level region |
| CN109469042A (en) * | 2018-12-10 | 2019-03-15 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of antiseepage stockyard place karst cave treatment structure |
| CN109667262A (en) * | 2019-02-25 | 2019-04-23 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of karst sinkhole plugging structure and its construction method |
| CN109881694A (en) * | 2019-04-04 | 2019-06-14 | 中铁十一局集团城市轨道工程有限公司 | A kind of constructing structure blocked for foundation pit substrate Sand and method |
-
2019
- 2019-11-08 CN CN201911088747.6A patent/CN110886305B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3716292A1 (en) * | 1987-05-15 | 1988-11-24 | Thosti Boswau Wtb Bau Ag | Method and arrangement for constructing a diaphragm wall |
| CN108978679A (en) * | 2018-07-04 | 2018-12-11 | 山西太钢不锈钢股份有限公司 | A kind of method that cable tunnel is constructed in high water level region |
| CN109469042A (en) * | 2018-12-10 | 2019-03-15 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of antiseepage stockyard place karst cave treatment structure |
| CN109667262A (en) * | 2019-02-25 | 2019-04-23 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of karst sinkhole plugging structure and its construction method |
| CN109881694A (en) * | 2019-04-04 | 2019-06-14 | 中铁十一局集团城市轨道工程有限公司 | A kind of constructing structure blocked for foundation pit substrate Sand and method |
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| CN110886305B (en) | 2021-05-07 |
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