CN113026786B - Air pressure circulating type precipitation monitoring method - Google Patents

Air pressure circulating type precipitation monitoring method Download PDF

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CN113026786B
CN113026786B CN202110568043.XA CN202110568043A CN113026786B CN 113026786 B CN113026786 B CN 113026786B CN 202110568043 A CN202110568043 A CN 202110568043A CN 113026786 B CN113026786 B CN 113026786B
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CN113026786A (en
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王新新
张阿晋
程子聪
沈蓉
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Shanghai Construction Group Co Ltd
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Shanghai Construction Group Co Ltd
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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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02—Improving by compacting
    • E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00—Production methods
    • E02D2250/0053—Production methods using suction or vacuum techniques

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  • Life Sciences & Earth Sciences (AREA)
  • Structural Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mining & Mineral Resources (AREA)
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  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Soil Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Abstract

The invention discloses a pneumatic circulating type precipitation monitoring method, and relates to the technical field of foundation pit precipitation. The method aims at the problems of long dewatering period and poor soil body dewatering effect caused by poor soil layer permeability, high water content and the like in a soft soil area. The method comprises the following steps: installing a precipitation well pipe, installing a first vacuum pumping device and a first water pumping device in a vacuum area of the precipitation well pipe, installing a second air compressing device and a second water pumping device in an air compressing area of the precipitation well pipe, establishing a foundation pit water reducing standard model, and calculating a corresponding water pumping quantity QU when the maximum vacuum degree of the vacuum pumping device is reachedmaxAnd the corresponding water pumping amount QP at the maximum air pressure of the air compressing devicemaxObtaining the water yield Q of the single well according to a field water pumping test, and establishing a relation curve of the water yield Q of the single well and the water level descending depth; and adjusting the actual water pumping quantities of the vacuum area and the compressed air area in real time according to the water pumping quantity change value delta Q, so that the actual water pumping quantities of the vacuum area and the compressed air area are kept consistent.

Description

Air pressure circulating type precipitation monitoring method
Technical Field
The invention relates to the technical field of foundation pit dewatering, in particular to a pneumatic circulating type dewatering monitoring method.
Background
At present, the existing foundation pit dewatering method generally adopts a well point dewatering mode or a vacuum dewatering mode, the dewatering mode can dewater the water in the foundation soil, promote the soil body to be solidified, improve the foundation strength, and simultaneously can reduce the lateral displacement and settlement of the soil body of the soil slope.
Disclosure of Invention
The method aims at solving the problems of long dewatering period and poor soil body dewatering effect caused by poor soil layer permeability, high water content, large soil layer thickness and the like in a soft soil area. The invention aims to provide an air pressure circulating type precipitation monitoring method.
The technical scheme adopted by the invention for solving the technical problems is as follows: the air pressure circulating type precipitation monitoring method is characterized by comprising the following steps:
s1: installing a precipitation well pipe according to the precipitation depth and the aquifer position, installing a vacuum pumping device and a first water pumping device in a vacuum area of the precipitation well pipe, and installing a pressure of the precipitation well pipeAn air compressing device and a water pumping device II are installed in the air area, a foundation pit dewatering standard model is established, and the corresponding water pumping quantity QU of the vacuum pumping device in the maximum vacuum degree is calculated through the foundation pit dewatering standard modelmaxAnd the corresponding water pumping amount QP at the maximum air pressure of the air compressing devicemaxObtaining the water yield Q of the single well according to a field water pumping test, and establishing a relation curve of the water yield Q of the single well and the water level descending depth;
s2: in the foundation pit precipitation construction process, the actual water pumping amount of the vacuum area and the actual water pumping amount of the air compression area are adjusted in real time according to the water pumping amount change value delta Q, so that the actual water pumping amount of the vacuum area and the actual water pumping amount of the air compression area are kept consistent, and the water pumping amount change value delta Q is Q- (Q1 + Q2), wherein Q is the water yield of a single well, Q1 is the actual water pumping amount of the first water pumping device, and Q2 is the actual water pumping amount of the second water pumping device.
Preferably, in step S1, the precipitation well pipe includes well casing main part and sets up in the baffle of its inner chamber along its axial, the bottom of well casing main part is sealed, be equipped with a plurality of through-holes on the pipe wall of well casing main part along radial, the baffle will well casing main part inner chamber is separated for vacuum area and compressed air district, just the vacuum area with compressed air district interval sets up.
Preferably, the cross section of the partition board is in a straight shape or a cross shape, the partition board is fixedly connected to the inner wall of the well pipe main body, and the width of the partition board is matched with the inner diameter of the well pipe main body.
Preferably, the precipitation well pipe is formed by connecting a plurality of well pipe sections end to end, and socket joints are formed between every two adjacent well pipe sections.
Preferably, the position of the through hole of the well pipe body corresponds to the position of the soil water-bearing zone.
Preferably, the step S1 further includes installing a sealing cover plate on the top of the precipitation well pipe, and the sealing cover plate is provided with an installation hole for passing the vacuum pumping device, the air compressing device, the first water pumping device and the second water pumping device.
Preferably, in step S2, when Δ Q =0,
when Q1 is greater than Q2,
adjusting the water yield delta Q in the vacuum aream＝QUmax÷（QUmax+ QPmax) X (Q1-Q2) ÷ 2, followed by a maximum vacuum U of the evacuation devicemaxAnd the corresponding water pumping quantity QU at the maximum vacuum degreemaxBased on the standard, the vacuum degree in the vacuum area is adjusted according to linear change in equal proportion until the adjusted water yield of the vacuum area reaches delta Qm(ii) a Or regulating and increasing the water yield delta Q in the air compression arean＝QPmax÷（QUmax+ QPmax) X (Q1-Q2) ÷ 2, and then, the maximum air pressure value P of the air compressormaxAnd the corresponding water pumping amount QP at the maximum air pressuremaxAs a reference, the air pressure in the pressurized air region is adjusted according to linear change in equal proportion until the adjusted and increased water yield of the pressurized air region reaches delta Qn；
When Q1 < Q2,
adjusting the water yield delta Q in the vacuum aream＝QUmax÷（QUmax+ QPmax) X (Q2-Q1) ÷ 2, followed by a maximum vacuum U of the evacuation devicemaxAnd the corresponding water pumping quantity QU at the maximum vacuum degreemaxAs a reference, the vacuum degree of the vacuum area is adjusted to be larger according to linear change in equal proportion until the adjusted and increased water yield of the vacuum area reaches delta Qm(ii) a Or regulating water output quantity delta Q in the air compression arean＝QPmax÷（QUmax+ QPmax) X (Q2-Q1) ÷ 2, and then, the maximum air pressure value P of the air compressormaxAnd the corresponding water pumping amount QP at the maximum air pressuremaxOn the basis, the air pressure in the air compression zone is adjusted to be smaller according to linear change equal ratio until the water output of the air compression zone is adjusted to be reduced to reach delta Qn。
Preferably, in step S2, if Δ Q > 0,
when Q1 is more than Q2, the water yield delta Q is adjusted and reduced in the vacuum aream＝QUmax÷（QUmax+ QPmax) xDeltaQ 2, followed by a maximum vacuum U of the vacuum extractormaxAnd the corresponding water pumping quantity QU at the maximum vacuum degreemaxBased on the standard, the vacuum degree of the vacuum area is adjusted according to linear change in equal proportion until the water quantity of the vacuum area is adjusted and reduced to reach delta Qm(ii) a Or regulating and increasing the water yield delta Q in the air compression arean＝QPmax÷（QUmax+ QPmax) xDeltaQ 2, and then using the maximum pressure value P of air compressormaxAnd the corresponding water pumping amount QP at the maximum air pressuremaxBased on the reference, the air pressure in the pressurized air region is adjusted proportionally according to linear change until the adjusted and increased water amount of the pressurized air region reaches delta Qn；
When Q1 is less than Q2, the water yield delta Q is adjusted in the vacuum aream＝QUmax÷（QUmax+ QPmax) xDeltaQ 2, followed by a maximum vacuum U of the vacuum extractormaxAnd the corresponding water pumping quantity QU at the maximum vacuum degreemaxAs a reference, the vacuum degree of the vacuum area is proportionally increased according to linear change until the adjusted and increased water yield of the vacuum area reaches delta Qm(ii) a Or, the water yield delta Q is adjusted and reduced in the air compression arean＝QPmax÷（QUmax+ QPmax) xDeltaQ 2, and then using the maximum pressure value P of air compressormaxAnd the corresponding water pumping amount QP at the maximum air pressuremaxOn the basis, the air pressure in the air compression area is adjusted to be small according to linear change in an equal ratio until the water quantity of the air compression area is adjusted to be reduced to reach delta Qn。
The invention has the following beneficial effects: the invention relates to an air pressure circulating type precipitation monitoring method, which adopts a symmetric pumping and air compressing precipitation mode, wherein a large-suction vacuum pumping device is used for pumping vacuum in a vacuum area of a precipitation well pipe to form a certain vacuum degree in the vacuum area and promote water in a soil aquifer to flow into the precipitation well pipe, an air compressing device is used for compressing air in an air compressing area of the precipitation well pipe to form a certain pressure in the precipitation well pipe, high-pressure air enters the aquifer through holes in the pipe wall of the precipitation well pipe to improve the regional permeability of the aquifer and promote water in the soil aquifer to flow into the precipitation well pipe, and the permeability of the soil is changed by controlling the air pressure value and the vacuum degree of different functional regions in the precipitation well pipe to realize balanced precipitation of different functional regions in the soil aquifer; and the two water pumping devices respectively pump water to the vacuum area and the air compression area, the water pumping amount of the two water pumping devices is balanced in the precipitation process, and the vacuum area and the air compression area are circularly converted, so that the uniform precipitation of soil bodies around the precipitation well pipe is realized, and the uneven settlement of the ground is avoided.
Drawings
FIG. 1 is a schematic view of a configuration of a precipitation well pipe according to an embodiment of the method for pneumatic circulation precipitation monitoring according to the invention;
FIG. 2 is a cross-sectional view E-E of FIG. 1;
FIG. 3 is a schematic diagram of the method for monitoring precipitation in a pneumatic circulation manner according to the present invention.
The numbers in the figures are as follows:
a pneumatic circulating precipitation system 100; a precipitation well pipe 10; a well tubular body 11; a through hole 11-1; a separator 12; a vacuum zone 14; a gas compression zone 15; a sealing cover plate 16; a vacuum-pumping device 30; a compressor unit 20; a first pumping device 41; and a second water pumping device 42.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. For convenience of description, the directions of "up" and "down" described below are the same as the directions of "up" and "down" in the drawings, but this is not a limitation of the technical solution of the present invention.
Example 1
The pneumatic circulating type precipitation monitoring method of the invention is described by combining with the figures 1 to 3, and the concrete steps are as follows:
s1: determining a precipitation scheme according to the size of a foundation pit plane, support arrangement, precipitation depth and the like, reasonably arranging an air pressure circulating type precipitation system 100 according to the precipitation scheme, wherein the air pressure circulating type precipitation system 100 comprises a precipitation well pipe 10, a vacuumizing device 30, an air compressing device 20, a first pumping device 41 and a second pumping device 42, processing and installing the precipitation well pipe 10 according to the precipitation depth and the position of a water-bearing stratum, installing the vacuumizing device 30 and the first pumping device 41 in a vacuum area 14 of the precipitation well pipe 10, installing the air compressing device 20 and the second pumping device 42 in an air compressing area 15 of the precipitation well pipe 10, establishing a foundation pit water-reducing standard model, and calculating the maximum vacuum degree U (U) of the vacuumizing device 30 through the foundation pit water-reducing standard modelmaxAmount of water QU corresponding to timemaxAnd maximum pressure P of compressor 20maxTime-corresponding water pumping amount QPmaxRoot of Chinese characterObtaining the water yield Q of the single well according to a field water pumping test, establishing a relation curve of the water yield Q of the single well and the water level descending depth, and taking the water yield Q of the single well as a precipitation monitoring standard;
s2: in the foundation pit precipitation construction process, the actual water pumping amount of the vacuum area 14 and the air compressing area 15 is adjusted in real time according to the water pumping amount change value delta Q, so that the actual water pumping amount of the vacuum area 14 and the actual water pumping amount of the air compressing area 15 are kept consistent, and the water pumping amount change value delta Q is Q- (Q1 + Q2), wherein Q is the water output of a single well, Q1 is the actual water pumping amount of the first pumping device 41, and Q2 is the actual water pumping amount of the second pumping device 42.
The invention relates to an air pressure circulating type precipitation monitoring method, which adopts a symmetric pumping and air compressing precipitation mode, wherein a large-suction vacuum pumping device 30 is used for pumping vacuum in a vacuum area 14 of a precipitation well pipe 10 to form a certain vacuum degree in the vacuum area 14 and promote water in a soil aquifer to flow into the precipitation well pipe 10, an air compressing device 20 is used for compressing air in an air compressing area 15 of the precipitation well pipe 10 to form a certain pressure in the precipitation well pipe 10, high-pressure gas enters the aquifer through a through hole 11-1 in the pipe wall of the precipitation well pipe 10 to improve the regional permeability of the aquifer and promote the water in the soil aquifer to flow into the precipitation well pipe 10, and the air pressure value and the vacuum degree of different functional regions in the precipitation well pipe 10 are controlled to change the permeability of a soil body and realize precipitation balance of different functional regions in the soil aquifer; moreover, the two water pumping devices respectively pump water to the vacuum area 14 and the air compression area 15, the water pumping amount of the two water pumping devices is balanced in the precipitation process, and the vacuum area 14 and the air compression area 15 are circularly converted, so that uniform precipitation of soil around the precipitation well pipe 10 is realized, and uneven settlement of the ground is avoided.
As shown in fig. 3, the step S1 further includes, before the precipitation construction, installing the sealing cover plate 16 on the top of the precipitation well pipe 10, and providing mounting holes for the vacuum device 30, the air compressing device 20, the first pumping device 41 and the second pumping device 42 to pass through on the sealing cover plate 16, and sealing the precipitation well pipe 10 by the sealing cover plate 16 to improve the precipitation efficiency.
As shown in fig. 1, the precipitation well pipe 10 comprises a well pipe body 11 and a partition plate 12 arranged in an inner cavity of the well pipe body 11 along an axial direction of the well pipe body, wherein the bottom end of the well pipe body 11 is sealed, a plurality of through holes 11-1 are radially arranged on a pipe wall of the well pipe body 11, the inner cavity of the well pipe body 11 is averagely divided into four areas by the partition plate 12, namely an area a, an area B, an area C and an area D, wherein the area a and the area D are vacuum areas 14, the area B and the area C are air compression areas 15, and the vacuum areas 14 and the air compression areas 15; the partition plate 12 divides the inner cavity of the precipitation well pipe 10 into two functional areas, namely a vacuum area 14 and an air compression area 15, which are arranged at intervals, after the precipitation well pipe 10 is installed, the air compressing device 20 is utilized to form a certain high pressure in the air compressing area 15, the air is pressed into the soil layer, thereby improving the permeability of the soil body, accelerating the flow of water in the soil layer, meanwhile, a certain vacuum degree is formed in the vacuum area 14 by the vacuum pumping device 30, so that water in the soil layer is promoted to flow into the precipitation well pipe 10 from the through hole 11-1, by respectively pressing gas into different functional zones of the single-well structure dewatering well pipe 10 and vacuumizing, the permeability characteristic of the low-permeability deep soil layer in the soft soil area is effectively improved, the quick dewatering and dewatering of the low-permeability deep soil layer are realized, and through the conversion of the vacuum area 14 and the air compression area 15, the uniform precipitation of the soil body around the precipitation well pipe 10 is realized, and the uneven settlement of the ground is avoided.
As shown in figure 1, the cross section of the baffle plate 12 is in a straight line shape or a cross shape, the baffle plate 12 is fixedly connected to the inner wall of the well pipe main body 11, the width of the baffle plate 12 is matched with the inner diameter of the well pipe main body 11, the inner cavity of the well pipe main body 11 is divided into two areas by the straight baffle plate 12, and the inner cavity of the well pipe main body 11 is divided into four areas by the cross baffle plate 12.
As shown in fig. 2, the precipitation well pipe 10 is formed by connecting a plurality of well pipe sections end to end, and two adjacent well pipe sections are in socket joint connection, that is, the connection parts of the well pipe main bodies 11 and the partition plates 12 of the two adjacent well pipe sections are in socket joint connection, so that good sealing performance of the precipitation well pipe 10 is ensured.
As shown in FIG. 3, the position of the through hole 11-1 of the well tubular body 11 corresponds to the position of the water-containing region of the soil body, and the through hole 11-1 has both water and air permeable functions.
In step S2, when Δ Q =0,
when Q1 is greater than Q2,
adjusting the water yield DeltaQ in the vacuum zone 14m＝QUmax÷（QUmax+ QPmax) X (Q1-Q2) ÷ 2, followed by a maximum vacuum U of the evacuation devicemaxAnd the corresponding water pumping quantity QU at the maximum vacuum degreemaxOn the basis, the vacuum degree in the vacuum area 14 is adjusted to be smaller according to linear change in an equal ratio until the adjusted water yield of the vacuum area 14 reaches delta Qm(ii) a Alternatively, the increased water amount DeltaQ is adjusted in the air compression area 15n＝QPmax÷（QUmax+ QPmax) X (Q1-Q2) ÷ 2, and then, the maximum air pressure value P of the air compressormaxAnd the corresponding water pumping amount QP at the maximum air pressuremaxOn the basis, the air pressure in the pressurized air region 15 is adjusted proportionally according to linear change until the adjusted and increased water yield of the pressurized air region 15 reaches delta Qn；
When Q1 < Q2,
adjusting the increased water yield DeltaQ in the vacuum zone 14m＝QUmax÷（QUmax+ QPmax) X (Q2-Q1) ÷ 2, followed by a maximum vacuum U of the evacuation devicemaxAnd the corresponding water pumping quantity QU at the maximum vacuum degreemaxOn the basis, the vacuum degree of the vacuum area 14 is adjusted to be larger according to the linear change and equal ratio until the adjusted and increased water yield of the vacuum area 14 reaches delta Qm(ii) a Alternatively, the water output quantity DeltaQ is regulated and reduced in the air compression area 15n＝QPmax÷（QUmax+ QPmax) X (Q2-Q1) ÷ 2, and then, the maximum air pressure value P of the air compressormaxAnd the corresponding water pumping amount QP at the maximum air pressuremaxOn the basis, the air pressure in the air compression area 15 is adjusted to be smaller according to linear change equal ratio until the adjustment water output of the air compression area 15 reaches delta Qn。
In step S2, if Δ Q > 0,
when Q1 is greater than Q2,
adjusting the water yield DeltaQ in the vacuum zone 14m＝QUmax÷（QUmax+ QPmax) xDeltaQ 2, followed by a maximum vacuum U of the vacuum extractormaxAnd the corresponding water pumping quantity QU at the maximum vacuum degreemaxOn the basis of the standard, the vacuum degree of the vacuum area 14 is adjusted to be smaller according to linear change in an equal ratio until the water quantity of the vacuum area 14 is adjusted to reach delta Qm(ii) a Or increased in the compressed air zone 15Water quantity delta Qn＝QPmax÷（QUmax+ QPmax) xDeltaQ 2, and then using the maximum pressure value P of air compressormaxAnd the corresponding water pumping amount QP at the maximum air pressuremaxOn the basis, the air pressure in the pressurized air region 15 is adjusted proportionally according to linear change until the adjusted pressurized water amount of the pressurized air region 15 reaches delta Qn；
When Q1 < Q2,
adjusting the increased water yield DeltaQ in the vacuum zone 14m＝QUmax÷（QUmax+ QPmax) xDeltaQ 2, followed by a maximum vacuum U of the vacuum extractormaxAnd the corresponding water pumping quantity QU at the maximum vacuum degreemaxOn the basis of the standard, the vacuum degree of the vacuum area 14 is adjusted to be larger according to linear change and equal ratio until the adjusted and increased water quantity of the vacuum area 14 reaches delta Qm(ii) a Or the water yield delta Q is adjusted and reduced in the air compression area 15n＝QPmax÷（QUmax+ QPmax) xDeltaQ 2, and then using the maximum pressure value P of air compressormaxAnd the corresponding water pumping amount QP at the maximum air pressuremaxOn the basis, the air pressure in the air compression area 15 is adjusted to be small according to linear change in an equal ratio until the water output of the air compression area 15 is adjusted to be reduced to delta Qn。
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.

Claims (7)

1. The air pressure circulating type precipitation monitoring method is characterized by comprising the following steps:
s1: installing a precipitation well pipe according to the precipitation depth and the aquifer position, installing a first vacuum pumping device and a first water pumping device in a vacuum area of the precipitation well pipe, installing a second air compressing device and a second water pumping device in an air compressing area of the precipitation well pipe, establishing a foundation pit water-reducing standard model, and calculating the corresponding water pumping quantity QU when the maximum vacuum degree of the vacuum pumping device is achieved through the foundation pit water-reducing standard modelmaxAnd the corresponding water pumping amount QP at the maximum air pressure of the air compressing devicemaxObtaining the water yield Q of a single well according to a field water pumping testEstablishing a relation curve of the water yield Q of the single well and the water level descending depth;
s2: during the construction process of foundation pit dewatering, the actual water pumping quantity of the vacuum area and the air compression area is adjusted in real time according to the water pumping quantity change value delta Q, so that the actual water pumping quantity of the vacuum area and the actual water pumping quantity of the air compression area are kept consistent, if the delta Q =0,
when Q1 is greater than Q2,
adjusting the water yield delta Q in the vacuum aream＝QUmax÷（QUmax+ QPmax) X (Q1-Q2) ÷ 2, followed by a maximum vacuum U of the evacuation devicemaxAnd the corresponding water pumping quantity QU at the maximum vacuum degreemaxBased on the standard, the vacuum degree in the vacuum area is adjusted according to linear change in equal proportion until the adjusted water yield of the vacuum area reaches delta Qm(ii) a Or regulating and increasing the water yield delta Q in the air compression arean＝QPmax÷（QUmax+ QPmax) X (Q1-Q2) ÷ 2, and then, the maximum air pressure value P of the air compressormaxAnd the corresponding water pumping amount QP at the maximum air pressuremaxAs a reference, the air pressure in the pressurized air region is adjusted according to linear change in equal proportion until the adjusted and increased water yield of the pressurized air region reaches delta Qn；
When Q1 < Q2,
adjusting the water yield delta Q in the vacuum aream＝QUmax÷（QUmax+ QPmax) X (Q2-Q1) ÷ 2, followed by a maximum vacuum U of the evacuation devicemaxAnd the corresponding water pumping quantity QU at the maximum vacuum degreemaxAs a reference, the vacuum degree of the vacuum area is adjusted to be larger according to linear change in equal proportion until the adjusted and increased water yield of the vacuum area reaches delta Qm(ii) a Or regulating water output quantity delta Q in the air compression arean＝QPmax÷（QUmax+ QPmax) X (Q2-Q1) ÷ 2, and then, the maximum air pressure value P of the air compressormaxAnd the corresponding water pumping amount QP at the maximum air pressuremaxOn the basis, the air pressure in the air compression zone is adjusted to be smaller according to linear change equal ratio until the water output of the air compression zone is adjusted to be reduced to reach delta Qn；
And the water pumping amount change value delta Q is Q- (Q1 + Q2), wherein Q is the water yield of the single well, Q1 is the actual water pumping amount of the first water pumping device, and Q2 is the actual water pumping amount of the second water pumping device.
2. The air pressure circulating type precipitation monitoring method is characterized by comprising the following steps:
s1: installing a precipitation well pipe according to the precipitation depth and the aquifer position, installing a first vacuum pumping device and a first water pumping device in a vacuum area of the precipitation well pipe, installing a second air compressing device and a second water pumping device in an air compressing area of the precipitation well pipe, establishing a foundation pit water-reducing standard model, and calculating the corresponding water pumping quantity QU when the maximum vacuum degree of the vacuum pumping device is achieved through the foundation pit water-reducing standard modelmaxAnd the corresponding water pumping amount QP at the maximum air pressure of the air compressing devicemaxObtaining the water yield Q of the single well according to a field water pumping test, and establishing a relation curve of the water yield Q of the single well and the water level descending depth;
s2: during the precipitation construction of the foundation pit, the actual water pumping quantity of the vacuum area and the air compression area is adjusted in real time according to the water pumping quantity change value delta Q, so that the actual water pumping quantity of the vacuum area and the actual water pumping quantity of the air compression area are kept consistent, if the delta Q is more than 0,
when Q1 is greater than Q2,
adjusting the water yield delta Q in the vacuum aream＝QUmax÷（QUmax+ QPmax) xDeltaQ 2, followed by a maximum vacuum U of the vacuum extractormaxAnd the corresponding water pumping quantity QU at the maximum vacuum degreemaxBased on the standard, the vacuum degree of the vacuum area is adjusted according to linear change in equal proportion until the water quantity of the vacuum area is adjusted and reduced to reach delta Qm(ii) a Or regulating and increasing the water yield delta Q in the air compression arean＝QPmax÷（QUmax+ QPmax) xDeltaQ 2, and then using the maximum pressure value P of air compressormaxAnd the corresponding water pumping amount QP at the maximum air pressuremaxBased on the reference, the air pressure in the pressurized air region is adjusted proportionally according to linear change until the adjusted and increased water amount of the pressurized air region reaches delta Qn；
When Q1 < Q2,
adjusting the water yield delta Q in the vacuum aream＝QUmax÷（QUmax+ QPmax) xDeltaQ 2, followed by a maximum vacuum U of the vacuum extractormaxAnd maximum degree of vacuumCorresponding water pumping quantity QUmaxAs a reference, the vacuum degree of the vacuum area is proportionally increased according to linear change until the adjusted and increased water yield of the vacuum area reaches delta Qm(ii) a Or, the water yield delta Q is adjusted and reduced in the air compression arean＝QPmax÷（QUmax+ QPmax) xDeltaQ 2, and then using the maximum pressure value P of air compressormaxAnd the corresponding water pumping amount QP at the maximum air pressuremaxOn the basis, the air pressure in the air compression area is adjusted to be small according to linear change in an equal ratio until the water quantity of the air compression area is adjusted to be reduced to reach delta Qn；
And the water pumping amount change value delta Q is Q- (Q1 + Q2), wherein Q is the water yield of the single well, Q1 is the actual water pumping amount of the first water pumping device, and Q2 is the actual water pumping amount of the second water pumping device.
3. The method of monitoring atmospheric cyclic precipitation of claim 1 or 2, wherein: in step S1, the precipitation well pipe includes well casing main part and sets up in the baffle of its inner chamber along its axial, the bottom of well casing main part is sealed, radially be equipped with a plurality of through-holes on the pipe wall of well casing main part, the baffle will well casing main part inner chamber is separated for vacuum area and compressed air district, just the vacuum area with compressed air district interval sets up.
4. The method of claim 3, wherein the method comprises: the cross section of the partition board is in a straight shape or a cross shape, the partition board is fixedly connected to the inner wall of the well pipe main body, and the width of the partition board is matched with the inner diameter of the well pipe main body.
5. The method of claim 3, wherein the method comprises: the precipitation well pipe is formed by connecting a plurality of well pipe sections end to end, and socket joint connection is formed between every two adjacent well pipe sections.
6. The method of claim 3, wherein the method comprises: the position of the through hole of the well pipe main body corresponds to the position of the soil water-bearing area.
7. The method of monitoring atmospheric cyclic precipitation of claim 1 or 2, wherein: and the step S1 further comprises the step of installing a sealing cover plate on the top of the precipitation well pipe, wherein the sealing cover plate is provided with an installation hole for a vacuum pumping device, an air compressing device, a first water pumping device and a second water pumping device to pass through.
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CN105332384A (en) * 2015-11-27 2016-02-17 上海长凯岩土工程有限公司 Super pressure suction joint pumping system and operating method thereof
CN105442624A (en) * 2015-12-29 2016-03-30 上海广联环境岩土工程股份有限公司 Gas pumping-injecting interactive type foundation pit precipitation system and precipitation method thereof
CN205444215U (en) * 2015-12-28 2016-08-10 上海广联环境岩土工程股份有限公司 Gas drive foundation pit dewatering system
CN109653186A (en) * 2019-01-21 2019-04-19 吴慧明 A kind of soft-soil foundation treatment method of parital vacuum combination high-pressure aerosol disturbance
CN111270663A (en) * 2019-12-09 2020-06-12 中交四航工程研究院有限公司 Positive and negative pressure combined vacuum preloading soft foundation reinforcing system and method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004360243A (en) * 2003-06-03 2004-12-24 Shimizu Corp Ground liquefaction preventive method
CN1664245A (en) * 2005-04-01 2005-09-07 东南大学 Operation method for consolidating soft soil foundation by pneumatic flerry vacuum preloading method
CN105332384A (en) * 2015-11-27 2016-02-17 上海长凯岩土工程有限公司 Super pressure suction joint pumping system and operating method thereof
CN205444215U (en) * 2015-12-28 2016-08-10 上海广联环境岩土工程股份有限公司 Gas drive foundation pit dewatering system
CN105442624A (en) * 2015-12-29 2016-03-30 上海广联环境岩土工程股份有限公司 Gas pumping-injecting interactive type foundation pit precipitation system and precipitation method thereof
CN109653186A (en) * 2019-01-21 2019-04-19 吴慧明 A kind of soft-soil foundation treatment method of parital vacuum combination high-pressure aerosol disturbance
CN111270663A (en) * 2019-12-09 2020-06-12 中交四航工程研究院有限公司 Positive and negative pressure combined vacuum preloading soft foundation reinforcing system and method

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