CN115142452B - Foundation pit dewatering method based on rock strata geology - Google Patents
Foundation pit dewatering method based on rock strata geology Download PDFInfo
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- CN115142452B CN115142452B CN202210669623.2A CN202210669623A CN115142452B CN 115142452 B CN115142452 B CN 115142452B CN 202210669623 A CN202210669623 A CN 202210669623A CN 115142452 B CN115142452 B CN 115142452B
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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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Abstract
The invention discloses a foundation pit dewatering method for stratum geology, which divides the bottom of a foundation pit into a plurality of relatively independent water collecting areas, and each area is provided with a water seepage blind ditch. And the water flushing point at the bottom of the foundation pit is provided with a water seepage well or a water seepage ditch is excavated, and the water flushing point at the side wall of the foundation pit is used for carrying out foundation pit inner-point dewatering in a manner of arranging a dewatering well and a pumping well outside the foundation pit. The infiltration trench well is connected with the infiltration blind ditch and is connected with the dewatering well and the pumping well outside the foundation pit through the communication blind ditch, so that efficient, fixed-point and accurate dewatering inside and outside the foundation pit is realized. The method solves the problem that the precipitation effect is poor when the conventional precipitation method is adopted for the foundation pit of the stratum geology.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a foundation pit dewatering method for stratum geology.
Background
At present, when deep foundation pit excavation and dewatering and drainage construction are performed on open cut subway stations and the like, dewatering wells are required to be constructed on the periphery of the foundation pit in advance under the general condition, dewatering operation is performed in advance before the foundation pit excavation, and construction procedures such as foundation pit excavation supporting and the like are guaranteed under the anhydrous condition. However, under geological conditions mainly including rock stratum, the rock stratum area has the characteristic of relatively obvious flowing along the bedrock cracks only because of the main form of bedrock crack water, the water permeability of the rock stratum with good integrity is relatively poor, most precipitation wells cannot achieve the effect of effective precipitation, the utilization rate of the precipitation wells is very low, and the precipitation effect is poor. Correspondingly, at the position where the bedrock fracture is relatively developed, the bedrock fracture water is large, and the precipitation well nearby the bedrock fracture water according to the conventional parameters cannot meet the precipitation requirement. The precipitation well which is arranged from the ground is difficult to accurately construct on the bedrock cracks, so that the positions of the precipitation well, the positions of the bedrock cracks and the amount of water in the cracks cannot be perfectly matched, the precipitation effect cannot be achieved, and the losses such as cost waste, construction period delay and the like are caused.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
In order to overcome the defects existing in the prior art, the foundation pit dewatering method for the stratum geology is provided at present, so that the problem that the foundation pit for the stratum geology is poor in dewatering effect due to the traditional dewatering method is solved.
In order to achieve the above purpose, a method for dewatering a foundation pit of a rock stratum geology is provided, which comprises the following steps:
in the process of excavating a foundation pit in stratum geology, a temporary water collecting pit is formed on the excavation surface of the foundation pit, and accumulated water in the temporary water collecting pit is timely formed so as to avoid accumulated water in the foundation pit;
Dividing the pit bottom of a foundation pit into a plurality of subareas after the foundation pit is excavated, and burying a grid-shaped water seepage blind ditch in each subarea;
Determining a first water-flushing point of the pit bottom and a second water-flushing point of the side wall of the foundation pit;
a water seepage ditch well is formed in the position of the first water inrush point and is connected with the water seepage blind ditch in the corresponding subarea of the first water inrush point, the top elevation of the water seepage ditch well is lower than the top elevation of the water seepage blind ditch, and the water seepage blind ditch and the water seepage ditch well are arranged below the bottom plate of the foundation pit;
And a pumping well and a dewatering well are arranged on the outer side of the foundation pit, the dewatering well and the second water-flushing point are arranged oppositely, and a plurality of water-seepage blind ditches in the subareas are connected with the pumping well or the dewatering well.
Further, the first water gushing point is in a strip shape, and the water seepage ditch well is a water seepage ditch arranged along the length direction of the first water gushing point.
Further, the first water-flushing point is in a point shape, and the water seepage ditch well is a water seepage well which is opposite to the water seepage first water-flushing point.
Furthermore, the water seepage blind ditch is connected with the pumping well or the dewatering well through a communication blind ditch.
Further, the top elevation of the communicating blind ditch is higher than the top elevation of the water seepage ditch well and lower than the top elevation of the water seepage blind ditch.
Further, the infiltration blind ditch includes:
The blind ditch body is formed at the pit bottom of the foundation pit;
a water permeable pipe arranged in the blind ditch body, and
The gravel layer is filled in the blind ditch body and is coated on the water permeable pipe.
Further, the dewatering well and the pumping well respectively include:
a sand-free pipe buried in the foundation below the pit bottom, and
And the crushed stone layer is coated on the sand-free pipe.
The foundation pit dewatering method for the stratum geology has the beneficial effects that the foundation pit bottom is divided into a plurality of relatively independent water collecting areas, and each area is provided with a water seepage blind ditch. And the water flushing point at the bottom of the foundation pit is provided with a water seepage well or a water seepage ditch is excavated, and the water flushing point at the side wall of the foundation pit is used for carrying out foundation pit inner-point dewatering in a manner of arranging a dewatering well and a pumping well outside the foundation pit. The infiltration trench well is connected with the infiltration blind ditch and is connected with the dewatering well and the pumping well outside the foundation pit through the communication blind ditch, so that efficient, fixed-point and accurate dewatering inside and outside the foundation pit is realized.
According to the foundation pit dewatering method for the stratum geology, through the foundation pit inner and outer combined dewatering and drainage construction method for the stratum geology bedrock fracture water, the problem that the well point dewatering effect of the stratum fracture water is not obvious can be solved, the integral safety of foundation pit structure and main body bottom plate construction is ensured, the engineering cost can be obviously reduced, the piling speed of a lower hard rock stratum is accelerated, resources are saved, and the work efficiency is improved.
The foundation pit dewatering method for stratum geology fully utilizes the characteristics of strong self-stability of rock stratum, mainly based on bedrock crack water and the like, adopts an open drainage scheme in the foundation pit excavation stage, and performs drainage and support while excavating on the premise of ensuring the safety of foundation pit excavation. The method reduces the construction difficulty and the construction cost, does not increase the interference to the surrounding environment, and achieves the purposes of quick construction, safe construction, economy and energy conservation.
The foundation pit dewatering method for stratum geology is suitable for the dewatering work of deep foundation pit and related main body structure construction under the condition of abundant groundwater in the construction process, has good popularization and application prospects, achieves the purpose of rapid construction, and can also cause safety problems due to untimely dewatering.
The foundation pit dewatering method for the stratum geology accords with the advanced concept of toolized operation, ensures the design intention, has the advantages of convenient operation, reduces excessive manpower and machinery, improves the construction safety of deep foundation pits in stratum areas, and increases the construction cost.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:
fig. 1 to 3 are schematic step diagrams of a method for dewatering a foundation pit of a formation geology according to an embodiment of the present invention.
Detailed Description
The application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be noted that, for convenience of description, only the portions related to the application are shown in the drawings.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
Referring to fig. 1 to 3, the present invention provides a method for dewatering a foundation pit of a formation geology, comprising the steps of:
S1, in the process of excavating a foundation pit in stratum geology, a temporary water collecting pit 1 is formed on an excavation surface A of the foundation pit, and water in the temporary water collecting pit 1 is timely accumulated so as to avoid water accumulation in the foundation pit.
And S2, after the foundation pit is excavated, dividing the pit bottom C of the foundation pit into a plurality of subareas B, and burying a grid-shaped water seepage blind ditch 4 in each subarea B.
And S3, determining a first water gushing point of the pit bottom C and a second water gushing point of the side wall of the foundation pit.
And S4, arranging a water seepage ditch well 5 at the position of the first water inrush point, wherein the water seepage ditch well 5 is connected with the water seepage blind ditch 4 in the partition B corresponding to the first water inrush point, the top elevation of the water seepage ditch well 5 is lower than the top elevation of the water seepage blind ditch 4, and the water seepage blind ditch 4 and the water seepage ditch well 5 are arranged below the bottom plate 3 of the foundation pit.
The first water gushing point is in a strip shape, and the water seepage ditch well 5 is a water seepage ditch arranged along the length direction of the first water gushing point.
The first water-flushing point is in a dot shape, and the water seepage ditch 5 is a water seepage well which is arranged opposite to the water seepage first water-flushing point.
S5, a pumping well 7 and a dewatering well 8 are arranged on the outer side of the foundation pit, the dewatering well 8 is opposite to the second water-flushing point, and the water-seepage blind ditches 4 in the subareas B are connected with the pumping well 7 or the dewatering well 8.
The infiltration blind drain 4 is connected with a pumping well 7 or a dewatering well 8 through a communicating blind drain 6.
The elevation of the top of the communicating blind ditch 6 is higher than the elevation of the top of the water seepage ditch well 5 and lower than the elevation of the top of the water seepage blind ditch 4.
Specifically, the water seepage blind ditch 4 comprises a blind ditch body, a water seepage pipe and a gravel layer. The blind ditch body is formed at the pit bottom C of the foundation pit. The permeable pipe is arranged in the blind ditch body. The broken stone layer filled in the blind ditch body is coated on the permeable tube.
The dewatering well 8 and the pumping well 7 respectively comprise a sand-free pipe and a gravel layer. The sand-free pipe is buried in the foundation below the pit bottom C. The crushed stone layer is coated on the sand-free pipe.
According to the foundation pit dewatering method for the stratum geology, a conventional dewatering scheme of the dewatering well outside the pit is not adopted in the foundation pit excavation stage, and temporary dewatering construction is performed in a well-defined dewatering mode in the pit. After the foundation pit is completely excavated, determining the actual position of a bedrock crack through a water-flushing point, utilizing a water-seepage ditch well and a water-seepage blind ditch for dewatering, communicating the blind ditch to drain underground water into a dewatering well and a drainage well outside the pit, and finally draining the basement into a ground drainage system by utilizing a water pump through the dewatering well and the drainage well outside the foundation pit.
According to the foundation pit dewatering method for the stratum geology, the foundation pit bottom is divided into a plurality of relatively independent seepage and drainage subareas, each subarea is provided with a seepage blind ditch, and the seepage blind ditches are mutually communicated to form a closed ring shape. And (3) constructing a water seepage ditch well (a water seepage well or a water seepage ditch) singly at the first water flushing point position visible at the bottom of the foundation pit, wherein the water seepage well or the water seepage ditch is connected into a water seepage blind ditch of a corresponding area. The water seepage ditch well is used for collecting residual water such as bedrock fracture water in a corresponding subarea range. The water seepage well is used for collecting larger first water flushing points of concentrated points at the bedrock fissure, and the water seepage ditch is used for collecting accumulated water of the water seepage blind ditch in the area and is communicated with the pumping well or the dewatering well outside the pit.
The construction time of the seepage well in the foundation pit can be reasonably determined according to the seepage amount in the pit at a specific construction stage or a construction position before the foundation pit is excavated or in the process of the excavation of the foundation pit.
The water seepage ditch in the pit bottom range of the foundation pit is carried out after the complete excavation of the foundation pit.
And carrying out construction after the excavation of the foundation pit is completed by a pumping well or a dewatering well outside the foundation pit.
After the foundation pit is excavated to the designed elevation of the pit bottom, the substrate is cleaned, if the precipitation well in the foundation pit constructed in the excavation stage is still effective, the precipitation well can be continuously reserved as the foundation pit bottom precipitation well, if the precipitation well deviates from the position of the bedrock crack, effective precipitation cannot be performed, and after the precipitation well is removed, the precipitation well is additionally positioned, and then the foundation pit is constructed.
And communicating the water seepage ditch well at the bottom of the foundation pit with the pumping well or the dewatering well at the outer side of the foundation pit through a communicating blind pipe. The communication blind pipe passes through the appropriate position among piles of the enclosure structure 2 (supporting piles), so that the normal use of the enclosure structure is not affected. And installing a water pump in the pumping well or the dewatering well outside the foundation pit, so that water seepage or bedrock crack water at the pit bottom is discharged to the municipal official network on the ground through the pumping well or the dewatering well outside the foundation pit, and the anhydrous operation in the foundation pit is achieved.
And the setting principle and the setting position of the pumping well or the dewatering well outside the foundation pit are judged according to the water flushing points on the side wall of the foundation pit. And (5) observing the water leakage condition of the bottom and the side wall of the foundation pit, marking out the water flushing points and the water leakage points of the bottom and the side wall of the foundation pit, and determining the positions of bedrock cracks by combining a land survey report. The side wall in the subarea range is provided with obvious water-flushing points, the foundation pit is judged to have bedrock cracks, and the dewatering well is directly constructed at the corresponding position outside the foundation pit. And no obvious leakage point exists on the side wall corresponding to the partition, and the fact that no obvious bedrock crack exists in the area is judged, so that a pumping well can be arranged at a proper position outside the foundation pit of the area.
The method of the dewatering well and the pumping well is basically the same, and sand-free pipes and outside broken stones are used for filling.
The pumping well outside the foundation pit is used for pumping water from the corresponding water seepage blind ditches outside the foundation pit.
The dewatering well on the outer side of the foundation pit is used for pumping and draining water collected by the water seepage blind ditches in the corresponding area in the foundation pit, collecting and pumping and draining the bedrock crevice water on the periphery of the foundation pit and draining the water to a ground drainage system.
And each 20 m-30 m is a water collecting and water pumping and draining partition according to different types such as the size of the foundation pit. And excavating a water seepage blind ditch at the bottom of the foundation pit, wherein the water seepage blind ditch has the size of 0.5m multiplied by 0.5m, and can be adjusted according to the water seepage amount. And a permeable blind pipe is paved in the permeable blind ditch, and permeable broken stone leveling is adopted on the permeable blind pipe.
The seepage well is connected with a closed-loop seepage blind ditch. After the water seepage blind ditches of each subarea form a closed ring, holes with proper sizes are drilled on the foundation pit support structure through the communication blind pipes communicated with the inside and the outside and led into the pumping well or the dewatering well outside the foundation pit, and the water is pumped and discharged to a ground drainage system through a high-power water pump in the pumping well or the dewatering well. The multiple drainage partition systems act together, so that the purpose of drainage of the whole foundation pit is achieved, emergency measures such as slotting in a structure and reserving water pumping holes in the conventional method are avoided, and the overall waterproof quality of the structure is effectively guaranteed.
And (3) adopting an open drainage mode (temporary water collection pit or temporary water collection well) in the pit to carry out water lowering and drainage in the foundation pit excavation process. And arranging temporary water collecting pits (or temporary water collecting wells) on the excavated surface of the foundation pit at intervals of certain areas. The depth of the water collection pit is 1.5-3m, bedrock crevice water in each area is collected, and the water is timely pumped out of the ground through a high-power water pump, so that accumulated water is prevented from forming in the foundation pit, and the excavation of the foundation pit is prevented from being influenced. The machine is matched with manual work to excavate, and the construction can be performed by adopting modes of loosening blasting, blasting control and the like if necessary.
The percolating well at the bottom of the foundation pit can be drilled by a drilling machine or manually dug, the aperture is about 1m, the depth of the percolating well is determined according to the water seepage amount at the position, and after the pit is dug, sand-free pipes, permeable gravels, pebbles and the like are filled in the percolating well, and the percolating well is connected into a main blind ditch in the partition through a branch blind ditch.
After the dewatering and drainage construction of the whole foundation pit or a plurality of sections of dewatering and drainage areas is finished by adopting the dewatering method, the basement main body structure construction can be carried out after the foundation pit bottom and the side walls are judged to be free from wet spots such as clear running water. And then, sequentially completing the construction of the waterproof layers and the structural layers of the basement bottom plate, the middle plate, the side walls and the top plate in a layered and segmented mode.
After the main body structure of the basement is completely finished, construction of anti-floating beams and the like are carried out, and top plate earthing backfill compaction is finished. And closing the water pump in the pumping well or the dewatering well outside the foundation pit in stages to finish the relevant working procedures of deep foundation pit construction.
For the conditions of deep soil layer at the upper part of the foundation pit, shallow groundwater level, easy collapse, sand flow and the like during soil layer range excavation, temporary measures such as jet grouting piles, occluding piles, grouting reinforcement, temporary shallow dewatering wells and the like can be provided in the soil layer range so as to play roles in soil fixation, sand flow prevention, soil loss behind the enclosure structure and the like, and the excavation safety is ensured. A small amount of water seepage is allowed to enter the foundation pit, and the water seepage is treated in an open-row mode in the pit.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.
Claims (5)
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| CN202210669623.2A CN115142452B (en) | 2022-06-14 | 2022-06-14 | Foundation pit dewatering method based on rock strata geology |
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| CN202210669623.2A CN115142452B (en) | 2022-06-14 | 2022-06-14 | Foundation pit dewatering method based on rock strata geology |
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| CN117306570A (en) * | 2023-10-16 | 2023-12-29 | 中国一冶集团有限公司 | A kind of karst geological foundation pit dewatering and drainage structure and construction method |
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| CN207003458U (en) * | 2017-07-20 | 2018-02-13 | 中建一局集团装饰工程有限公司 | Foundation pit open water-precipitation system in foundation engineering construction |
| CN109403350A (en) * | 2018-12-18 | 2019-03-01 | 山西建筑工程集团有限公司 | Foundation pit supporting construction and foundation pit supporting method |
| CN112609720A (en) * | 2020-12-04 | 2021-04-06 | 中建五局土木工程有限公司 | Precipitation construction method suitable for deep foundation pit of high-pressure-bearing water-rich karst stratum |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004204574A (en) * | 2002-12-26 | 2004-07-22 | Shimizu Corp | Ground liquefaction prevention method |
| CN104294836B (en) * | 2014-10-30 | 2016-06-22 | 中冶建工集团有限公司 | There is the precipitation processing method in crack in foundation ditch water barrier |
| CN104532865A (en) * | 2014-12-16 | 2015-04-22 | 中启胶建集团有限公司 | Underground blind ditch and permanent water-collecting well comprehensive dewatering system applied to basement |
| CN209368854U (en) * | 2018-11-27 | 2019-09-10 | 上海宝冶集团有限公司 | Foundation pit side-wall infiltration current-collecting device |
| CN214194602U (en) * | 2020-12-04 | 2021-09-14 | 中建五局土木工程有限公司 | Precipitation structure suitable for deep foundation pit of high-pressure-bearing water-rich karst stratum |
| CN112746624A (en) * | 2020-12-22 | 2021-05-04 | 中铁九局集团第二工程有限公司 | Novel comprehensive water lowering and draining method and device for mudstone subway station |
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Patent Citations (3)
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|---|---|---|---|---|
| CN207003458U (en) * | 2017-07-20 | 2018-02-13 | 中建一局集团装饰工程有限公司 | Foundation pit open water-precipitation system in foundation engineering construction |
| CN109403350A (en) * | 2018-12-18 | 2019-03-01 | 山西建筑工程集团有限公司 | Foundation pit supporting construction and foundation pit supporting method |
| CN112609720A (en) * | 2020-12-04 | 2021-04-06 | 中建五局土木工程有限公司 | Precipitation construction method suitable for deep foundation pit of high-pressure-bearing water-rich karst stratum |
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