CN115094958A - Layered water pumping detection method for ultra-deep large-diameter high-pressure jet grouting bottom sealing effect - Google Patents
Layered water pumping detection method for ultra-deep large-diameter high-pressure jet grouting bottom sealing effect Download PDFInfo
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- CN115094958A CN115094958A CN202210624993.4A CN202210624993A CN115094958A CN 115094958 A CN115094958 A CN 115094958A CN 202210624993 A CN202210624993 A CN 202210624993A CN 115094958 A CN115094958 A CN 115094958A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing 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
- 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
- E02D19/16—Restraining of underground water by damming or interrupting the passage of underground water by placing or applying sealing substances
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
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- Structural Engineering (AREA)
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- Hydrology & Water Resources (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
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Abstract
The invention relates to a layered water pumping detection method for a bottom sealing effect of ultra-deep large-diameter high-pressure jet grouting, which comprises the following steps: sealing the periphery of the bottom sealing area of the foundation pit; constructing a dredging well; constructing an observation well; observing the water level once a day in a period; and (3) judging a detection result: if no water level change is observed after all the drainage wells pump water, judging that the side wall and the back cover of the back cover area of the foundation pit have no leakage; if the water level rises back after water pumping of all the drainage wells except the deepest drainage well, judging that the side wall of the corresponding underground water layer leaks; and if the water in the deepest drainage well cannot be pumped out, judging the leakage condition according to the water head changes of the two observation wells. The advantages are that: the method can effectively detect the bottom sealing effect of the invisible underground deep-buried foundation pit before earth excavation, and is simple and accurate in detection result.
Description
Technical Field
The invention relates to the technical field of high-pressure rotary-spraying bottom sealing effect detection, in particular to a layered water pumping detection method for an ultra-deep large-diameter high-pressure rotary-spraying bottom sealing effect.
Background
At present, in the construction process of an ultra-deep and ultra-large grading foundation pit, aiming at the problem that confined water at the bottom of the foundation pit has a water-resisting layer loss, an ultrahigh pressure rotary jet bottoming is generally adopted to plug a permeable skylight. After the back cover is finished, because no effective detection measure can be implemented in the prior art, the judgment of the back cover effect is inaccurate, and certain potential safety hazard exists.
Disclosure of Invention
The invention aims to solve the technical problem of providing a layered water pumping detection method for the ultra-deep large-diameter high-pressure jet grouting bottom sealing effect, and effectively overcomes the defects of the prior art.
The technical scheme for solving the technical problems is as follows:
a layered water pumping detection method for an ultra-deep large-diameter high-pressure rotary jet bottom sealing effect comprises the following steps:
step one, sealing the periphery of a foundation pit bottom sealing area;
step two, constructing a dredging well, which specifically comprises the following steps:
constructing a dredging well extending into each underground water layer in the bottom sealing area of the foundation pit, wherein the underground water layers above the bottom sealing of the foundation pit are at least two;
step three, constructing an observation well, which specifically comprises the following steps:
constructing two observation wells at the periphery of the foundation pit sealing area, wherein one observation well penetrates through a water-resisting layer at the bottom sealing position of the foundation pit, and the other observation well does not penetrate through the water-resisting layer at the bottom sealing position of the foundation pit;
setting a detection period, observing the water level once a day in the period, and making a relevant record;
and step five, judging the detection result, specifically:
if no water level change is observed after all the drainage wells pump water, judging that the side wall and the back cover of the back cover area of the foundation pit have no leakage; if the water level rises back after water pumping of all the drainage wells except the deepest drainage well, judging that the side wall of the corresponding underground water layer leaks; if the water in the deepest drainage well cannot be pumped out, the leakage condition is judged according to the water head change of the two observation wells: if only the water head of the observation well penetrating through the water-resisting layer changes, judging that the bottom seal of the foundation pit leaks; if only the water head of the observation well which does not pass through the water-resisting layer changes, judging that the side wall of the lower layer has leakage; if the water heads of the two observation wells are greatly changed, the existence of leakage at the bottom sealing of the lower-layer side wall and the existence of leakage at the lower-layer side wall are judged.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, in the step one, seal the foundation pit back cover area all around in the foundation pit construction process, specifically do: and sealing by using a foundation pit edge enclosing structure, wherein the enclosing structure comprises a ground connection wall, a plain wall or rows of stirring piles arranged at the edge of the foundation pit, or sealing by heightening the rotary spraying piles at the edge of the back cover to the top standard height of the pit, or sealing by using the enclosing structure and the rotary spraying piles at the edge of the back cover together.
Furthermore, in the second step, the underground water layer above the bottom seal of the foundation pit has three layers.
Furthermore, the drainage well extends into the corresponding underground water layer and is 1-3m close to the bottom.
Further, the fourth step further includes: during and after rainfall, the observation is strengthened, the observation is carried out for 2-3 times every day, and the rising speed of the water level is monitored.
Further, in the fourth step, the detection period is set to be 25-30 days after the bottom sealing construction is finished.
The beneficial effects of the invention are: the method can effectively detect the bottom sealing effect of the invisible underground deep-buried foundation pit before the earth excavation, and is simple and accurate in detection result.
Drawings
FIG. 1 is a flow chart of the method for detecting the stratified pumping of the ultra-deep large-diameter high-pressure jet grouting bottom sealing effect of the invention;
FIG. 2 is a structural distribution diagram of a dewatering well in the ultra-deep large-diameter high-pressure jet grouting bottom sealing effect layered water pumping detection method of the invention;
FIG. 3 is a structural distribution diagram of an observation well in the ultra-deep large-diameter high-pressure jet grouting bottom sealing effect layered water pumping detection method of the invention;
FIG. 4 is a first plan view of the bottom sealing of the foundation pit in the ultra-deep large-diameter high-pressure jet grouting bottom sealing effect layered water pumping detection method of the invention;
FIG. 5 is a second plan view of the bottom sealing of the foundation pit in the ultra-deep large-diameter high-pressure jet grouting bottom sealing effect layered water pumping detection method of the invention;
FIG. 6 is a third plan view of the bottom sealing of the foundation pit in the ultra-deep large-diameter high-pressure jet grouting bottom sealing effect layered water pumping detection method of the invention;
FIG. 7 is a fourth plan view of the bottom sealing of the foundation pit in the ultra-deep large-diameter high-pressure jet grouting bottom sealing effect layered water pumping detection method of the invention;
fig. 8 is a fifth plan view of the foundation pit bottom sealing in the ultra-deep large-diameter high-pressure jet grouting bottom sealing effect layered water pumping detection method of the invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, the examples of which are set forth to illustrate the invention and are not intended to limit the scope of the invention.
Example (b): as shown in fig. 1, 2 and 3, the method for detecting the layered water pumping of the ultra-deep large-diameter high-pressure jet grouting bottom sealing effect of the embodiment includes the following steps:
step one, sealing the periphery of a foundation pit bottom sealing area;
step two, constructing a dredging well, which specifically comprises the following steps:
constructing a dredging well extending into each underground water layer in the bottom sealing area of the foundation pit, wherein the underground water layers above the bottom sealing of the foundation pit are at least two;
step three, constructing an observation well, which specifically comprises the following steps:
constructing two observation wells at the periphery of the foundation pit closed area, wherein one observation well (denoted by L in the figure) penetrates through a water-resisting layer at the position of the foundation pit back cover, and the other observation well (denoted by M in the figure) does not penetrate through the water-resisting layer at the position of the foundation pit back cover;
step four, setting a detection period, observing the water level once a day in the period, and making relevant records;
and step five, judging the detection result, specifically:
if no water level rising phenomenon is observed after all the drainage wells pump water, judging that the side wall and the back cover of the back cover area of the foundation pit have no leakage; if the water level rises back after water pumping of all the drainage wells except the deepest drainage well, judging that the side wall of the corresponding underground water layer leaks; if the deepest drainage well is observed that water cannot be pumped completely (namely the drainage well C extending into the underground water layer at the lowest layer above the bottom seal of the foundation pit, A, B, C in the figure respectively indicate the drainage wells extending into different underground water layers), the leakage condition is judged according to the water head change of two observation wells: if only the water head of the observation well penetrating through a water-resisting layer (denoted by H in the figure) at the closed position of the foundation pit changes, judging that the bottom sealing (denoted by F in the figure) of the foundation pit has leakage; if only the observation well water head which does not penetrate through the water-resisting layer at the closed position of the foundation pit changes, judging that the side wall of the lower layer has leakage; if the water heads of the two observation wells are greatly changed, the existence of leakage at the bottom sealing of the lower-layer side wall and the existence of leakage at the lower-layer side wall are judged.
In this embodiment, the construction for sealing the periphery of the bottom sealing area of the foundation pit specifically includes the following steps:
seal foundation ditch back cover region all around in foundation ditch construction process, specifically do: the enclosing structure is used for enclosing, wherein the enclosing structure comprises a ground connection wall, a plain wall or rows of stirring piles (such as three-axis stirring piles or other types of stirring piles) arranged at the edge of the foundation pit, or enclosing is carried out by heightening the rotary spraying piles at the edge of the back cover to the height of the top of the pit, or enclosing is carried out by heightening the enclosing structure and the rotary spraying piles at the edge of the back cover together.
Specifically, the sealing of the periphery of the foundation pit bottom sealing area at least comprises the following forms:
firstly, as shown in fig. 4, one side of the periphery of the bottom sealing area of the foundation pit is sealed by using a building envelope (denoted by a in the figure), and the other three sides heighten the outer ring of the jet grouting pile (denoted by c in the figure) to the elevation of the top of the pit in the bottom sealing construction process, so that the complete sealing of the bottom sealing area of the foundation pit is finally realized, and a basic condition is provided for subsequent pumping detection.
Secondly, as shown in fig. 5, two sides of the periphery of the bottom sealing area of the foundation pit are sealed by using a building envelope (denoted by a in the figure), and the other two sides heighten the outer ring of the jet grouting pile (denoted by c in the figure) to the elevation of the top of the pit in the bottom sealing construction process, so that the bottom sealing area of the foundation pit is completely sealed, and a foundation condition is provided for subsequent pumping detection.
And thirdly, as shown in fig. 6, three sides of the periphery of the foundation pit bottom sealing area are sealed by using a building envelope (denoted by a in the figure), and the other sides are used for heightening the rotary jet grouting pile (denoted by c in the figure) on the outermost circle to the elevation of the pit top in the bottom sealing construction process, so that the foundation pit bottom sealing area is completely sealed, and a foundation condition is provided for subsequent water pumping detection.
Fourthly, as shown in fig. 7, the four sides of the bottom sealing area of the foundation pit are sealed by using the enclosure structure (a in the figure), and finally, the complete sealing of the bottom sealing area of the foundation pit is realized, so that basic conditions are provided for the subsequent pumping detection
Fifthly, as shown in fig. 8, around the bottom sealing area of the foundation pit, the rotary spraying piles (denoted by c in the figure) on the outermost circle are heightened to the elevation of the pit top on four sides in the bottom sealing construction process, and finally, the bottom sealing area of the foundation pit is completely sealed, so that basic conditions are provided for subsequent pumping detection.
In this embodiment, there are three groundwater layers above the bottom seal of the foundation pit, and a water-proof layer (denoted by G in the figure) is between two adjacent groundwater layers.
In this embodiment, the drainage wells extend into the corresponding groundwater layers 1 to 3m from the bottom.
In the embodiment, for more accurate detection, in the actual detection process, the initial water level value of the dredging well can be measured by a measuring rope and water level measurement, a steel ruler water level meter is adopted for water level monitoring, the minimum reading is 1mm, and the repeatability measurement error is +/-2 mm. The following data for the drywell were monitored simultaneously:
1) static water level: and after the well is formed and washed, the natural water level in the well is elevated.
2) Dynamic water level: the water level of pumping is stable, and the water level elevation in the well during pumping is carried out.
3) Water level depth reduction: difference between static and dynamic water levels.
4) And (3) the other: such as the hole depth, the type of the water pump related to pumping, the water yield, the position mark of the pump body of the water pump, and the like.
In the embodiment, in the detection process, a detection period is set, the water level is observed once a day in the period, and relevant records are made. In addition, during and after rainfall, the observation is strengthened, the daily observation times are increased to 2-3 times, and the water level rising speed is synchronously monitored.
In this embodiment, the setting of the detection period specifically includes: and (5) 25-30 days after the bottom sealing construction is finished.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the second feature or the first and second features may be indirectly contacting each other through intervening media. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (6)
1. A layered water pumping detection method for an ultra-deep large-diameter high-pressure rotary jet bottom sealing effect is characterized by comprising the following steps:
step one, sealing the periphery of a foundation pit bottom sealing area;
step two, constructing a dredging well, which specifically comprises the following steps:
constructing a dredging well extending into each underground water layer in the bottom sealing area of the foundation pit, wherein the underground water layers above the bottom sealing of the foundation pit are at least two;
step three, constructing an observation well, which specifically comprises the following steps:
constructing two observation wells at the periphery of the foundation pit sealing area, wherein one observation well penetrates through a water-resisting layer at the bottom sealing position of the foundation pit, and the other observation well does not penetrate through the water-resisting layer at the bottom sealing position of the foundation pit;
setting a detection period, observing the water level once a day in the period, and making a relevant record;
and step five, judging the detection result, specifically:
if no water level change is observed after all the drainage wells pump water, judging that the side wall and the back cover of the back cover area of the foundation pit have no leakage; if the water level rises back after water pumping of all the drainage wells except the deepest drainage well, judging that the side wall of the corresponding underground water layer leaks; if the water in the deepest drainage well cannot be pumped out, the leakage condition is judged according to the water head change of the two observation wells: if only the water head of the observation well penetrating through the water-resisting layer changes, judging that the bottom seal of the foundation pit leaks; if only the water head of the observation well which does not pass through the water-resisting layer changes, judging that the side wall of the lower layer has leakage; if the water heads of the two observation wells are greatly changed, the existence of leakage at the bottom sealing of the lower-layer side wall and the existence of leakage at the lower-layer side wall are judged.
2. The layered water pumping detection method for the ultra-deep large-diameter high-pressure jet grouting bottom sealing effect according to claim 1, wherein in the first step, the periphery of a bottom sealing area of a foundation pit is sealed in a foundation pit construction process, and the method specifically comprises the following steps: and sealing by using a foundation pit edge enclosing structure, wherein the enclosing structure comprises a ground connection wall, a plain wall or rows of stirring piles arranged at the edge of the foundation pit, or sealing by heightening the rotary spraying piles at the edge of the back cover to the top standard height of the pit, or sealing by using the enclosing structure and the rotary spraying piles at the edge of the back cover together.
3. The method for detecting the layered water pumping of the ultra-deep large-diameter high-pressure jet grouting bottom sealing effect according to claim 1, characterized in that: and in the second step, three layers of underground water layers are arranged above the bottom seal of the foundation pit.
4. The method for detecting the layered water pumping of the ultra-deep large-diameter high-pressure jet grouting bottom sealing effect according to claim 3, wherein the method comprises the following steps: and the drainage well extends into the corresponding underground water layer and is 1-3m close to the bottom.
5. The method for detecting the stratified pumping of the ultra-deep large-diameter high-pressure jet grouting bottom sealing effect according to claim 1, wherein the fourth step further comprises: during and after rainfall, the observation is strengthened, the observation is carried out for 2-3 times every day, and the rising speed of the water level is monitored.
6. The method for detecting the layered water pumping of the ultra-deep large-diameter high-pressure jet grouting bottom sealing effect according to claim 1, characterized in that: in the fourth step, the detection period is set to be 25-30 days after the bottom sealing construction is finished.
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| CN202210624993.4A CN115094958B (en) | 2022-06-02 | 2022-06-02 | Layered water pumping detection method for ultra-deep large-diameter high-pressure rotary spraying bottom sealing effect |
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| CN114541408A (en) * | 2022-03-03 | 2022-05-27 | 中铁四局集团有限公司 | Air-contained shaft structure at front upper part of end well of underground station and underpass construction method thereof |
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2022
- 2022-06-02 CN CN202210624993.4A patent/CN115094958B/en active Active
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| JP2016098554A (en) * | 2014-11-21 | 2016-05-30 | 五洋建設株式会社 | Observation method for ground water and tube body for observation used therefor |
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