CN114108719A - Leakage point judging method and leakage stopping method for mixing pile waterproof curtain of foundation pit - Google Patents
Leakage point judging method and leakage stopping method for mixing pile waterproof curtain of foundation pit Download PDFInfo
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- CN114108719A CN114108719A CN202111603094.8A CN202111603094A CN114108719A CN 114108719 A CN114108719 A CN 114108719A CN 202111603094 A CN202111603094 A CN 202111603094A CN 114108719 A CN114108719 A CN 114108719A
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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 that at least one row of observation wells are arranged on the top of a side slope along the layout direction of the stirring pile waterproof curtain, and each observation well is 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 leakage point judging method and a leakage stopping method for a mixing pile waterproof curtain of 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 range of the influence of the leakage point where the water curtain leakage may occur is large, it is difficult to determine the specific leakage point, and therefore, it is difficult to secure the excavation period without taking a control measure 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 leakage point of the water 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 a leakage point of a mixing 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 the side slope along the layout direction of the stirring pile waterproof curtain, and each observation well is 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.
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 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:
sequentially selecting two adjacent side slope downcast water pipe wells to synchronously pump water, and measuring and acquiring water level descending amplitude data in an observation well matched with the two side slope downcast water pipe wells;
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 while sequentially selecting the two adjacent slope descending water pipe wells to synchronously pump water comprises:
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 20-55 m, and the diameter is 65-225 mm. .
The application also provides a leaking stoppage method for performing leaking stoppage treatment on the leaking point of the stirring pile water-stopping curtain judged by the leaking point judging method of the stirring pile water-stopping curtain, and the leaking stoppage method further comprises the following steps of:
determining a leaking stoppage area at a leaking point of the stirring pile waterproof curtain and a side slope area outside the side slope downcomer well;
the side slope downcast pipe 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 downcast 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 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 light pipe well is arranged at the corner of the slope area, and the top of the light pipe well is lower than the top of the slope downpipe well.
Further preferably, the layout length of the light pipe well is at least more than or equal to 2L.
Further preferably, the distance between the layout direction of the light 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.
Further preferably, the distance between the layout direction of the light pipe well and the layout direction of the downhill pipe well is 5m to 10 m.
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 curtain, and the provided leakage stopping method can adopt control measures to stop leakage in time.
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: the detailed flowchart of step S10 in fig. 1;
FIG. 3: the detailed flowchart of step S20 in fig. 1;
FIG. 4: the detailed flowchart of step S30 in fig. 1;
FIG. 5: fig. 4 is a detailed flowchart of step S301;
FIG. 6: the detailed flowchart of step S50 in fig. 1;
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 specific flow chart of a plugging 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: 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:
step 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.
Step S20, arranging slope dewatering pipe wells 3 with the same elevation as the bottom elevation of the observation well 1 on a slope along the layout direction to obtain the water yield in each slope dewatering pipe well 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.
Step 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 point 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 large-scale surface detection area within 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 the present 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 present embodiment is described by taking the interval distance as 50m and the diameter as 70mm as an example, so as to meet the requirements of normal observation and investigation 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 waterproof curtain for mixing piles 2, and each observation well 1 is located on the side of the waterproof curtain for mixing piles 2 away from the side slope, that is, 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 of the stirring pile waterproof curtain 2, which is far away from the side slope, 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 the water yield of each slope downcomer well 3 disposed on the slope and determining the first target observation well according to the water yield includes:
step S201: sequentially selecting two adjacent side slope downpipe wells 3 for synchronous water pumping, and recording and comparing water yield;
step S202: comparing the larger water yield with water pumping test data, wherein the water pumping test data is water level change data of an observation well 1 located in an observation area around a precipitation well, which is obtained by arranging the precipitation well (not marked in the figure) in an observation area corresponding to the side slope precipitation well 3 and obtaining the water level change data after the extracted water amount in the precipitation well is a stable value according to the set extraction time and the set water level, 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 water stopping curtain of the mixing pile and the side slope downcomer well 3 are arranged in the observation area, a precipitation well (not identified in the figure) is arranged, water is pumped according to a set interval time, the amount of water pumped is counted until water is pumped to a preset water level, and if the amount of water pumped is a stable value, for example, the amount of water pumped is compared with an average value of the amounts of water pumped for many times in the pumping test process, and the error range does not exceed 5%, the amount of water pumped is determined to be the 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 the target observation well 1.
Further preferably, the step of measuring and acquiring water level decrease amplitude data inside each observation well 1, and determining a second target observation well according to the water level decrease amplitude data, that is, step S30 specifically includes the following steps:
s301, measuring and acquiring water level descending amplitude data inside 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 to synchronously pump water; it should be noted that the water level drop amplitude data may 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: 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 plugging method, which is used for performing plugging processing on the leakage point 21 of the mixing pile waterproof curtain determined by the leakage point determination method of the mixing pile waterproof 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;
step S300, arranging a plurality of light pipe wells 4 in the blocking and draining area along the layout direction parallel to the side slope downcast pipe well 3, and enabling the bottom of the light pipe wells 4 to be the same as the bottom elevation of the side slope downcast pipe 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 is worth mentioning 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 at least equal to or greater than 2L, 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 slope downpipe well, that is, the distance between the layout direction of the light pipe well 4 and the layout direction of the slope downpipe well 3 is 5m to 10 m.
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.
Therefore, through the cooperation of side slope downcomer 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 downcomer 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 merely to illustrate the technical solution of the present invention, not to limit the same, and the present invention has been described in detail with reference to the preferred embodiments. 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 (10)
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 the side slope along the layout direction of the stirring pile waterproof curtain, and each observation well is positioned on one side, away from the side slope, of the stirring pile waterproof curtain;
arranging slope dewatering pipe wells with the same elevation as the bottom elevation of the observation wells on the slope along the layout direction to obtain the water yield of the slope dewatering pipe wells 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 waterproof curtain of the mixing pile according to the first target observation well, the second target observation well and a preset rule.
2. The method for judging the leakage point of the waterproof curtain of the mixing pile 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 side slope along the layout direction of the waterproof curtain of the mixing pile, and enabling each observation well to be positioned on the side of the waterproof curtain of the mixing pile, which is away from the side slope, comprises the following steps:
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.
3. The method for judging the leakage point of the waterproof curtain for the mixing pile of the foundation pit according to claim 1, wherein the step of 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 comprises the following steps of:
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 target observation well.
4. The method for distinguishing the leakage point of the waterproof curtain for the mixing pile of the foundation pit as claimed in claim 3, wherein the step of measuring and acquiring the water level descending amplitude data inside each observation well and determining the second target observation well according to the water level descending amplitude data comprises:
sequentially selecting two adjacent side slope downcast water pipe wells to synchronously pump water, and measuring and acquiring water level descending amplitude data in an observation well matched with the two side slope downcast water pipe wells;
and determining the observation well with larger water level descending amplitude data as a second target observation well.
5. The method for judging the leakage point of the waterproof curtain for the mixing pile of the foundation pit as claimed in claim 4, wherein 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 while sequentially selecting the two adjacent slope descending water pipe wells for synchronous water pumping comprises:
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.
6. The method for judging the leakage point of the mixing pile waterproof curtain for the foundation pit according to claim 1, wherein the step of comprehensively judging the leakage point of the mixing pile waterproof curtain according to the first target observation well, the second target observation well and a preset rule comprises the following steps of:
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.
7. The method for judging the leak source of the waterproof curtain for the mixing pile of the foundation pit as claimed in claim 1, wherein the interval distance of the observation well is 20-55 m, and the diameter is 65-225 mm.
8. A method for plugging a leakage point of a stirring pile waterproof curtain determined by the method for determining a leakage point of a stirring pile waterproof curtain for a foundation pit according to any one of claims 1 to 7, further comprising the steps of:
determining a leaking stoppage area at a leaking point of the stirring pile waterproof curtain and a side slope area outside the side slope downcomer well;
the side slope downcast pipe 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 downcast 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 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.
9. A method of plugging a hole according to claim 8, wherein the light pipe well is placed at a corner of a slope area and the top of the light pipe well is lower than the top of the slope downpipe well.
10. A method for plugging a well according to claim 8, wherein the layout length of the light pipe well is at least 2L or more; 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; the distance between the layout direction of the light pipe well and the layout direction of the side slope downpipe well is 5-10 m.
Priority Applications (1)
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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 | Ultra-deep foundation pit support structure 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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| 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 | Ultra-deep foundation pit support structure 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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