CN114108719B - Leakage point distinguishing method and leakage stopping method for mixing pile waterproof curtain of foundation pit - Google Patents
Leakage point distinguishing method and leakage stopping method for mixing pile waterproof curtain of foundation pit Download PDFInfo
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- CN114108719B CN114108719B CN202111603094.8A CN202111603094A CN114108719B CN 114108719 B CN114108719 B CN 114108719B CN 202111603094 A CN202111603094 A CN 202111603094A CN 114108719 B CN114108719 B CN 114108719B
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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
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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Abstract
The method mainly comprises the following steps of arranging at least one row of observation wells on the top of a side slope along the layout direction of the stirring pile waterproof curtain, and enabling each observation well to be positioned on one side, away from the side slope, of the stirring pile waterproof curtain; acquiring the water yield of each side slope dewatering pipe well arranged on a side slope, and determining a first target observation well according to the water yield; measuring and acquiring water level descending amplitude data inside each observation well, and determining a second target observation well according to the water level descending amplitude data; and comprehensively judging the leakage points of the waterproof curtain of the mixing pile according to the first target observation well, the second target observation well and a preset rule. Compared with the prior art, the leakage point of the stirring pile waterproof curtain can be determined in a short time, and the judgment time of the leakage point of the stirring pile waterproof curtain is greatly shortened.
Description
Technical Field
The invention relates to the field of buildings, in particular to a method for judging leakage points and a method for stopping leakage of a stirring pile water-stopping curtain for a foundation pit.
Background
At present, when carrying out deep basal pit excavation, often can meet the permeable bed that has abundant groundwater, the construction quality of the stirring stake stagnant water curtain on sealed permeable bed influences the key of stagnant water effect.
However, when a large-scale stirring pile waterproof curtain is constructed, especially when the stirring pile waterproof curtain is constructed, due to various reasons such as construction quality dispersion and geological change, the stirring pile waterproof curtain on the side slope of the foundation pit is poor in effect, and the foundation pit is seriously infiltrated when being excavated, which brings considerable potential safety hazard to the side slope. However, since the influence range of the leakage point where the water-stop curtain leakage may occur is large, it is difficult to determine the specific leakage point, and thus it is difficult to ensure the excavation period if no control measure is taken for the lateral leakage water in a short time. In addition, the existing control measures, such as grouting or pile filling, can cause huge cost and long time consumption, and seriously affect the excavation period.
Therefore, how to provide a determination method and a plugging method to shorten the determination time of the plugging point of the waterproof curtain is a technical problem to be solved.
Disclosure of Invention
In view of the above drawbacks and deficiencies of the prior art, the present invention provides a method for determining a leakage point of a waterproof curtain for a mixing pile of a foundation pit, so as to shorten the determination time of the leakage point of the waterproof curtain.
In order to solve the technical problem, the invention provides a method for judging leakage points of a stirring pile waterproof curtain for a foundation pit, which comprises the following steps:
at least one row of observation wells are arranged on the top of a slope along the layout direction of the stirring pile waterproof curtain, and each observation well is positioned on one side, away from the slope, of the stirring pile waterproof curtain;
arranging slope downcast wells with bottom elevations identical to the bottom elevations of the observation wells on the slope along the layout direction, acquiring water yield of each slope downcast well arranged on the slope, and determining a first target observation well according to the water yield;
measuring and acquiring water level descending amplitude data inside each observation well, and determining a second target observation well according to the water level descending amplitude data;
and comprehensively judging the leakage points of the stirring pile waterproof curtain according to the first target observation well, the second target observation well and a preset rule.
Further preferably, the step of at least arranging one row of observation wells on the top of the side slope along the layout direction of the waterproof curtain of the mixing piles, and enabling each observation well to be located on one side of the waterproof curtain of the mixing piles away from the side slope includes:
an observation well is arranged on the top of the side slope and is positioned at one side of the stirring pile waterproof curtain, which is far away from the side slope, and the observation well and the side slope downpipe well are respectively positioned at two opposite sides of the stirring pile waterproof curtain;
the observation wells are arranged in parallel and at equal intervals along the layout direction parallel to the stirring pile waterproof curtain, wherein the distance between every two adjacent observation wells is larger than the distance between every two adjacent slope downpipe wells.
Further preferably, the step of simultaneously acquiring the water yield of each slope downcast well arranged on the slope and determining the first target observation well according to the water yield includes:
sequentially selecting two adjacent side slope downpipe wells for synchronous water pumping, and recording and comparing water yield;
comparing the larger water yield with water pumping test data, wherein the water pumping test data is water level change data of observation wells positioned in observation areas around a water pumping well, which is obtained by arranging the water pumping well in the observation area corresponding to the side slope water pumping well and extracting the water quantity in the water pumping well to be a stable value according to the set extraction time and the set water level;
if the larger water yield is close to the water level change data of the same period, judging that the slope downcomer well with the larger water yield is the target downcomer;
and setting the observation well adjacent to the target downcomer as a first target observation well.
Further preferably, the step of measuring and acquiring water level descending amplitude data inside each observation well, and determining a second target observation well according to the water level descending amplitude data includes:
measuring and acquiring water level descending amplitude data in an observation well matched with two adjacent side slope descending water pipe wells while sequentially selecting the two adjacent side slope descending water pipe wells for synchronous water pumping;
and determining the observation well with larger water level descending amplitude data as a second target observation well.
Further preferably, the step of measuring and acquiring the water level descending amplitude data inside the observation well matched with the two slope descending water pipe wells comprises the following steps of:
sequentially selecting two adjacent side slope downcomer wells to synchronously pump water, and measuring and recording water level descending amplitude data in an observation well matched with the two side slope downcomer wells;
and when the water level in the observation well is lowered to a stable position, determining and recording the water level lowering amplitude data.
Further preferably, the step of comprehensively judging the leakage point of the waterproof curtain of the mixing pile according to the first target observation well, the second target observation well and a preset rule comprises:
judging whether the first target observation well and the second target observation well are the same observation well;
if so, setting the area of the first target observation well, which is adjacent to the corresponding waterproof curtain of the stirring pile, as a leakage point;
and if not, setting the areas of the stirring pile waterproof curtains corresponding to the first target observation well and the second target observation well as leakage points.
Further preferably, the interval distance of the observation wells is 20 to 55m, and the diameter of the observation wells is 65 to 225mm.
The application also provides a leaking stoppage method for performing leaking stoppage treatment on the leaking stoppage points of the stirring pile water-stopping curtain determined by the leaking stoppage point determination method of the stirring pile water-stopping curtain, and the leaking stoppage method further comprises the following steps:
determining a leaking stoppage area at a leaking stoppage point of the stirring pile water-stopping curtain and a side slope area outside the side slope downcomer well;
the side slope downcomer wells with short adjacent distance of the leakage points are taken as centers, at least two times of the distance between every two adjacent side slope downcomer wells is taken as a radius, and the range of the leakage stopping area is defined;
in the plugging and draining area, a plurality of light pipe wells are arranged along the layout direction parallel to the side slope downcast pipe wells, and the bottom elevations of the light pipe wells are the same as the bottom elevations of the side slope downcast pipe wells;
and pumping water to the light pipe well to pump out leaked underground water, so that leakage stoppage is realized.
Further preferably, the lightweight tubular well is arranged at the toe of the side slope area, and the top of the lightweight tubular well is lower than the top of the side slope downpipe well.
Further preferably, the layout length of the lightweight tubular well is greater than or equal to 2L.
Further preferably, the distance between the layout direction of the lightweight pipe well and the layout direction of the downhill water pipe well is smaller than the distance between the layout direction of the downhill water pipe well and the layout direction of the mixing pile waterproof curtain.
Preferably, the distance between the layout direction of the light pipe well and the layout direction of the side slope downpipe well is 5m to 10m.
Compared with the prior art, the invention has the following beneficial effects:
the method for judging the leakage point of the stirring pile water stopping curtain shortens the judgment time of the leakage point of the water stopping curtain, and the provided leakage stopping method can timely perform leakage stopping treatment on leakage water by adopting control measures.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1: the invention discloses a flow chart of a method for judging leakage points of a stirring pile waterproof curtain in a first embodiment;
FIG. 2 is a schematic diagram: FIG. 1 is a detailed flowchart of step S10;
FIG. 3: FIG. 1 is a detailed flowchart of step S20;
FIG. 4: FIG. 1 is a detailed flowchart of step S30;
FIG. 5 is a schematic view of: fig. 4 is a detailed flowchart of step S301;
FIG. 6: FIG. 1 is a detailed flowchart of step S50;
FIG. 7: the construction state schematic diagram is used for judging the leakage point of the stirring pile waterproof curtain;
FIG. 8: a state schematic diagram for performing a leakage stopping measure on a leakage point of the stirring pile waterproof curtain;
FIG. 9: a detailed flow chart of a leaking stoppage method of a stirring pile waterproof curtain in the second embodiment of the invention;
FIG. 10: the layout of the light pipe well in the second embodiment of the invention is schematic;
reference numerals are as follows: an observation well 1; a stirring pile waterproof curtain 2; a penetration point 21; a side slope downpipe well 3; a light pipe well 4.
Detailed Description
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Example one
As shown in fig. 1 to 8, a first embodiment of the present invention provides a method for identifying a missing point of a waterproof curtain 2 for a mixing pile of a foundation pit, which mainly includes the following steps:
s10, at least one row of observation wells 1 are arranged on the top of the side slope along the layout direction of the stirring pile waterproof curtain 2, and each observation well 1 is located on one side, away from the side slope, of the stirring pile waterproof curtain 2; among them, the stirring pile waterproof curtain 2 in the present embodiment is preferably a stirring pile waterproof curtain.
S20, arranging slope dewatering pipe wells 3 with the same elevation as the bottom of the observation well 1 on a slope along the layout direction to obtain the water yield in the slope dewatering pipe wells 3 arranged on the slope, and determining a first target observation well according to the water yield; the bottom elevation of the observation well 1 is the same as the bottom elevation of the slope downcomer well 3, which means that the bottoms of the observation well 1 and the slope downcomer well 3 are located on the same horizontal line; it should be noted that the slope downcast piping shaft 3 is preferably installed after the mixing pile waterproof curtain 2 is installed.
S30, measuring and acquiring water level descending amplitude data inside each observation well 1, and determining a second target observation well according to the water level descending amplitude data;
and S50, comprehensively judging the leakage points of the stirring pile waterproof curtain 2 according to the first target observation well, the second target observation well and a preset rule.
Through the steps, the leakage point of the stirring pile waterproof curtain 2 can be determined in a short time, and the judgment time of the stirring pile waterproof curtain 2, especially the leakage point of the stirring pile waterproof curtain, is greatly shortened. In the whole process, only a corresponding number of observation wells 1 are needed to be arranged according to the layout direction of the waterproof curtain 2 for the stirring piles, the first target observation well, the second target observation well and preset rules are determined according to the water level descending range data in the observation wells 1 and the water yield in each slope descending water pipe well 3, the leakage point of the waterproof curtain 2 for the stirring piles can be judged in a detection area in a large range in a short time, and therefore control measures are taken for leakage water in time, the normal excavation period is guaranteed, the phenomenon of delay is avoided, and the detection and construction cost is reduced.
It should be noted that, in this embodiment, the interval distance of the observation well 1 may be preferably 20 to 55m, and the diameter is preferably 65 to 225mm, and the embodiment is described by taking the interval distance as 50m and the diameter as 70mm as an example only, so as to meet the normal observation and investigation requirements and reduce the construction cost.
Further preferably, at least one row of observation wells 1 is arranged on the top of the side slope along the layout direction of the stirring pile waterproof curtain 2, and each observation well 1 is located on one side of the stirring pile waterproof curtain 2 away from the side slope, that is, the step S10 specifically includes the following steps:
step S101: an observation well 1 is arranged on the top of the side slope and downwards along the ground on one side, away from the side slope, of the stirring pile waterproof curtain 2, and the observation well 1 and the side slope downpipe well 3 are respectively arranged on two opposite sides of the stirring pile waterproof curtain 2;
step S102: the observation wells 1 are arranged in parallel and at equal intervals along the layout direction parallel to the stirring pile waterproof curtain 2, wherein the distance between every two adjacent observation wells 1 is larger than the distance between every two adjacent slope downpipe wells 3.
Further preferably, the step S20 of acquiring water yields in the slope downcast wells 3 disposed on the slope and determining the first target observation well according to the water yields includes:
step S201: sequentially selecting two adjacent side slope downpipe wells 3 for synchronous water pumping, and recording and comparing water yield;
step S202: and comparing the larger water yield with water pumping test data, wherein the water pumping test data is water level change data of the observation well 1 in the observation area around the precipitation well, which is obtained by arranging the precipitation well (not marked in the figure) in the observation area corresponding to the side slope precipitation well 3 and according to the set extraction time and the set water level after the extracted water amount in the precipitation well is a stable value, so that the underground water level change in the observation area is reflected conveniently. It should be noted that, in the water pumping test data, before the stirring pile water-stop curtain and the slope downcast pipe well 3 are set in the observation area, a dewatering well (not identified in the drawing) is set, and water is pumped according to a set interval time, until water is pumped to a preset water level, the quantity of pumped water is counted, if the quantity of pumped water is a stable value, for example, the quantity of pumped water is compared with an average value of quantities of water pumped many times in the pumping experiment process, and an error range does not exceed 5%, it is determined that the quantity of pumped water is a stable value. In addition, the extraction time set in this embodiment is at least 24 hours. The set time interval can be designed to be 5 minutes, 10 minutes, 20 minutes, 30 minutes, 1 hour or several hours according to actual requirements, and is not specifically limited and described herein.
Step S203: if the larger water yield is close to the variation water quantity in the observation well corresponding to the water level variation data in the same period, the slope downcomer well 3 with the larger water yield is judged to be the target downcomer;
step S204: and setting the observation well 1 adjacent to the target downcomer as a first target observation well.
Further preferably, the step of measuring and acquiring water level descending amplitude data inside each observation well 1, and determining a second target observation well according to the water level descending amplitude data, that is, the step S30 specifically includes the following steps:
s301, measuring and acquiring water level descending amplitude data in an observation well 1 matched with two adjacent side slope descending water pipe wells 3 while sequentially selecting the two adjacent side slope descending water pipe wells 3 for synchronous water pumping; it should be noted that the data of the water level drop amplitude can be measured by a water level meter.
And S302, determining the observation well 1 with larger water level descending amplitude data as a second target observation well.
Further preferably, the step of measuring and acquiring the water level descending amplitude data inside the observation well 1 matched with the two slope descending water pipe wells 3 while sequentially selecting the two adjacent slope descending water pipe wells 3 to synchronously pump water, that is, the step 301 specifically includes:
step 3011: sequentially selecting two adjacent side slope downpipe wells 3 to perform 7-step water pumping, and measuring and recording water level descending amplitude data inside an observation well 1 matched with the two side slope downpipe wells 3;
step 3012: and when the water level in the observation well 1 is lowered to a stable position, determining and recording the water level lowering amplitude data. Wherein, the stable position can be preferably the water level when the water pumping is continuously carried out on the slope downpipe well 3 for 24 hours and the observed water level change amplitude of the observation well 1 does not exceed 10 cm. Furthermore, if the water level variation amplitude of the observation well 1 is observed to exceed 10cm after the water pumping is continuously performed on the slope downpipe well 3 for 24 hours, the water pumping is continued until the water level variation amplitude of the observation well 1 does not exceed 10cm within 24 hours of continuous water pumping, and the water level of the observation well 1 is taken as a stable position after the water pumping is performed for 24 hours.
Further preferably, the step of comprehensively determining the leakage point of the waterproof curtain 2 of the mixing pile according to the first target observation well, the second target observation well and a preset rule, that is, the step S50 specifically includes:
s501, judging whether the first target observation well and the second target observation well are the same observation well 1;
step S502, if yes, setting the area of the first target observation well, which is adjacent to the corresponding stirring pile waterproof curtain 2, as a leakage point;
and S503, if not, setting the areas of the stirring pile waterproof curtain 2 corresponding to the first target observation well and the second target observation well as leakage points.
Through the steps, the judgment range of the leakage point can be accurately and quickly reduced in a detection area in a large range, and the leakage point is judged.
Example two
The present application further provides a leaking stoppage method for performing leaking stoppage treatment on the leaking stoppage point 21 of the stirring pile water stopping curtain determined by the leaking stoppage point determination method of the stirring pile water stopping curtain 2 in the above embodiment, as shown in fig. 9 and 10, the method further includes the following steps:
step S100, determining a leaking stoppage area at a leaking point of the stirring pile waterproof curtain 2 and a side slope area outside the side slope downcast pipe well 3;
s200, centering the slope downcomer wells 3 with short adjacent distance of the leakage points 21, and defining the range of the leakage stopping area by taking at least two times of the distance between every two adjacent slope downcomer wells 3 as a radius;
and S300, arranging a plurality of light pipe wells 4 in the blocking and draining area along the layout direction parallel to the side slope downcomer well 3, and enabling the bottom of the light pipe wells 4 to be the same as the bottom elevation of the side slope downcomer well 3.
And S400, pumping water to the light pipe well 4 to pump out leaked underground water, so that plugging is realized.
Through the steps, after the leakage point 21 of the stirring pile waterproof curtain 2 is determined in a short time, the leakage water is subjected to leakage stopping treatment by taking control measures in time, so that the normal operation of the excavation construction period is ensured, and the phenomenon of delay is avoided. In the whole process, only a corresponding number of observation wells 1 are needed to be arranged according to the layout direction of the waterproof curtain 2 for the mixing piles, and the first target observation well, the second target observation well and a preset rule are determined according to the water level descending range data in the observation wells 1 and the water yield in each slope descending water pipe well 3 for comparison, so that the leakage point of the waterproof curtain 2 for the mixing piles can be judged in a short time. And moreover, the light pipe well is arranged in the side slope area between the leaking point of the stirring pile water-stopping curtain 2 and the side slope water-descending pipe well 3, and then after water in the light pipe well is pumped out, the leaking point of the stirring pile water-stopping curtain 2 can be effectively blocked, the range and the area of leaking stoppage are greatly shortened, and the leaking stoppage cost is reduced.
In addition, it should be mentioned that, as a preferable mode, the distance between two adjacent light pipe wells 4 in the embodiment is less than or equal to L/2, so as to prevent water seepage to the maximum extent.
In addition, in the present embodiment, preferably, the distance between the layout direction of the light pipe well 4 and the layout direction of the downhill water pipe well 3 is smaller than the distance between the layout direction of the downhill water pipe well 3 and the layout direction of the mixing pile waterproof curtain 2, so as to search and achieve leakage stoppage in the minimum range.
In addition, as a preferable mode, as shown in fig. 10, the layout length of the light pipe well 4 in the present embodiment is 2L or more, so as to prevent leakage points from being missed.
In addition, it is worth saying that, in order to satisfy the actual user demand, the light pipe well in this embodiment mainly can be formed by connecting a main pipe with a plurality of branch pipes from top to bottom, or the well that sets up in the slope region constitutes. Wherein, if light piping shaft adopts the PVC pipe, then the branch pipe preferably adopts the diameter 32mm, the PVC pipe of degree of depth 7m, is responsible for diameter 50mm to, and this embodiment only takes light piping shaft to be responsible for from last to connecting several branch pipes etc. by a person in charge and constitutes as the explanation, in order to conveniently extract the water of seepage.
Further preferably, the distance between the light pipe well 4 and the side slope downpipe well, that is, the distance between the layout direction of the light pipe well 4 and the layout direction of the side slope downpipe well 3 is 5m to 10m.
The step S400 may be further preferably a step of:
when the light pipe well 4 is pumped, the side slope downpipe well is synchronously pumped so as to pump out leaked underground water, thereby realizing plugging.
Consequently, through the cooperation of side slope downpipe well and light-duty tubular well, can go on simultaneously through two kinds of precipitation measures, can play the effect of better precipitation to its leaking stoppage time is compared and is carried out the leaking stoppage time stack of precipitation through side slope downpipe well and light-duty tubular well respectively alone and all will be short, consequently, has good coordination between the two, and the leaking stoppage time is shorter.
The above embodiments are only for illustrating the technical solution of the present invention and are not limitative, and the present invention is described in detail with reference to the preferred embodiments only. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made without departing from the spirit and scope of the present invention and it is intended to cover the appended claims.
Claims (6)
1. A method for judging a leak point of a stirring pile waterproof curtain for a foundation pit is characterized by comprising the following steps of:
at least one row of observation wells are arranged on the top of a slope along the layout direction of the stirring pile waterproof curtain, and each observation well is positioned on one side, away from the slope, of the stirring pile waterproof curtain;
arranging slope downcast wells with bottom elevation identical to that of the observation wells on the slope along the layout direction to obtain water yield of the slope downcast wells arranged on the slope, and determining a first target observation well according to the water yield; sequentially selecting two adjacent side slope downpipe wells for synchronous water pumping, and recording and comparing water yield; comparing the larger water yield with water pumping test data, wherein the water pumping test data is water level change data of observation wells positioned in observation areas around a water pumping well, which is obtained by arranging the water pumping well in the observation area corresponding to the side slope water pumping well and extracting the water quantity in the water pumping well to be a stable value according to the set extraction time and the set water level; if the larger water yield is close to the water level change data of the same period, judging that the slope downcomer well with the larger water yield is the target downcomer; setting an observation well adjacent to the target downcomer as a first target observation well;
measuring and acquiring water level descending amplitude data inside each observation well, and determining a second target observation well according to the water level descending amplitude data; the step of measuring and acquiring water level descending amplitude data inside each observation well and determining a second target observation well according to the water level descending amplitude data comprises the following steps: measuring and acquiring water level descending amplitude data in an observation well matched with two adjacent side slope descending water pipe wells while sequentially selecting the two adjacent side slope descending water pipe wells for synchronous water pumping; determining the observation well with larger water level descending amplitude data as a second target observation well; when the water level in the observation well is lowered to a stable position, determining and recording the water level lowering amplitude data;
comprehensively judging the leakage points of the waterproof curtain of the mixing pile according to the first target observation well, the second target observation well and a preset rule, wherein the step of comprehensively judging the leakage points of the waterproof curtain of the mixing pile according to the first target observation well, the second target observation well and the preset rule comprises the following steps: judging whether the first target observation well and the second target observation well are the same observation well or not; if so, setting the area of the first target observation well, which is adjacent to the corresponding waterproof curtain of the stirring pile, as a leakage point; and if not, setting the areas of the stirring pile waterproof curtains corresponding to the first target observation well and the second target observation well as leakage points.
2. The method for judging the leakage point of the stirring pile waterproof curtain for the foundation pit according to claim 1, wherein the step of arranging at least one row of observation wells on the top of the slope along the layout direction of the stirring pile waterproof curtain and enabling the observation wells to be located on the side, away from the slope, of the stirring pile waterproof curtain comprises the following steps:
an observation well is arranged on one side, away from the side slope, of the stirring pile waterproof curtain on the top of the side slope and is arranged downwards along the ground, and the observation well and the side slope downpipe well are respectively arranged on two opposite sides of the stirring pile waterproof curtain;
the observation wells are arranged in parallel and at equal intervals along the layout direction parallel to the stirring pile waterproof curtain, wherein the distance between every two adjacent observation wells is larger than the distance between every two adjacent slope downpipe wells.
3. The method for judging the leakage point of the stirring pile waterproof curtain for the foundation pit as claimed in claim 1, wherein the interval distance of the observation well is 20 to 55m, and the diameter of the observation well is 65 to 225mm.
4. A method for stopping leakage of a leakage point of a mixing pile waterproof curtain determined by the method for judging a leakage point of a mixing pile waterproof curtain for a foundation pit according to any one of claims 1 to 3, comprising the steps of:
determining a leaking stoppage area at a leaking stoppage point of the stirring pile water-stopping curtain and a side slope area outside the side slope downcomer well;
the side slope descending water pipe well with short adjacent distance of the leakage point is taken as a center, at least two times of the distance between two adjacent side slope descending water pipe wells is taken as a radius, and the range of the leakage stopping area is defined;
in the plugging and draining area, a plurality of light pipe wells are arranged along the layout direction parallel to the side slope downcast pipe wells, and the bottom of each light pipe well is enabled to be the same as the bottom elevation of each side slope downcast pipe well;
and pumping water to the light pipe well to pump out leaked underground water, thereby realizing plugging.
5. A method of plugging a pipeline as in claim 4, wherein the lightweight tubular well is placed at the toe of a slope area with its top lower than the top of the downhill tubular well.
6. A method for stopping leakage according to claim 4, wherein the layout length of the light pipe well is more than or equal to 2L; the distance between the layout direction of the light pipe well and the layout direction of the side slope downpipe well is smaller than the distance between the layout direction of the side slope downpipe well and the layout direction of the mixing pile waterproof curtain; and the distance between the layout direction of the light pipe well and the layout direction of the side slope downpipe well is 5m to 10m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111603094.8A CN114108719B (en) | 2021-12-24 | 2021-12-24 | Leakage point distinguishing method and leakage stopping method for mixing pile waterproof curtain of foundation pit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111603094.8A CN114108719B (en) | 2021-12-24 | 2021-12-24 | Leakage point distinguishing method and leakage stopping method for mixing pile waterproof curtain of foundation pit |
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| Publication Number | Publication Date |
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| CN114108719A CN114108719A (en) | 2022-03-01 |
| CN114108719B true CN114108719B (en) | 2023-01-06 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101339087A (en) * | 2008-08-26 | 2009-01-07 | 江苏华东建设基础工程有限公司 | Rapid detector system for water stopping curtain seepage channel and detection method |
| JP2012197603A (en) * | 2011-03-22 | 2012-10-18 | Shimizu Corp | Water leakage position estimating method for earth retaining wall, and ground excavation method |
| CN107727337A (en) * | 2017-11-14 | 2018-02-23 | 中国海洋大学 | A kind of leakage detection method of the foundation pit enclosure structure based on micro logging electrical method |
| CN110006595A (en) * | 2019-03-20 | 2019-07-12 | 中铁四局集团有限公司 | A kind of Retaining Structure of Extra-deep Excavation plane leakage detection method |
| CN112985718A (en) * | 2021-02-05 | 2021-06-18 | 中建一局集团建设发展有限公司 | Waterproof curtain evaluation system and method based on high-density resistivity method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101339087A (en) * | 2008-08-26 | 2009-01-07 | 江苏华东建设基础工程有限公司 | Rapid detector system for water stopping curtain seepage channel and detection method |
| JP2012197603A (en) * | 2011-03-22 | 2012-10-18 | Shimizu Corp | Water leakage position estimating method for earth retaining wall, and ground excavation method |
| CN107727337A (en) * | 2017-11-14 | 2018-02-23 | 中国海洋大学 | A kind of leakage detection method of the foundation pit enclosure structure based on micro logging electrical method |
| CN110006595A (en) * | 2019-03-20 | 2019-07-12 | 中铁四局集团有限公司 | A kind of Retaining Structure of Extra-deep Excavation plane leakage detection method |
| CN112985718A (en) * | 2021-02-05 | 2021-06-18 | 中建一局集团建设发展有限公司 | Waterproof curtain evaluation system and method based on high-density resistivity method |
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