A device and method for deep in-situ sampling and testing of water cut curtains

Abstract

The application discloses a device for deep slurry in-situ sampling and testing of a water interception curtain, which comprises a slurry storage device, a guide head is detachably arranged at the bottom of the slurry storage device, a sealing body is arranged in the slurry storage device, the top of the sealing body is connected with one end of a connecting line, the other end of the connecting line extends out of the top of the slurry storage device and is connected with a data acquisition instrument; the slurry storage device, the conical base, the sealing body, the connecting line, the liquid pressure sensor and the data acquisition instrument are combined to realize the functions of deep slurry sampling of a water interception curtain groove, efficient sealing of the slurry storage device, in-situ online monitoring of slurry pressure, in-situ viscosity detection, accurate measurement of testing depth and real-time data acquisition, improve the accuracy of slurry extraction and the accuracy of performance testing of the deep slurry of the groove, guarantee the construction quality and water interception effect of the water interception curtain, and solve the technical problems that slurry in different positions and depths in the groove of the water interception curtain is difficult to sample, and slurry in-situ pressure and in-situ viscosity cannot be tested.

Description

Technical Field

[0001] This invention belongs to the fields of seepage prevention engineering, curtain interception and building construction, and relates to a testing device, specifically a device and method for in-situ sampling and testing of deep mud in a water-cutting curtain. Background Technology

[0002] With societal progress and development, environmental policies are becoming increasingly stringent. In municipal and building construction, cutoff walls are frequently used to prevent groundwater seepage and replenishment from foundation pits and building structures. In mining engineering, cutoff walls are used to intercept mine or mine pit water supply, reducing mine water inflow and protecting mine water resources. Currently, cutoff walls are constructed using trench or pile-type structures. During construction, mud slurry is injected into the trenches and boreholes to protect the walls and maintain stability. The density, viscosity, and sand content of the mud slurry significantly affect the construction quality of the cutoff wall. Accurate extraction, testing, and control of mud slurry quality have become crucial issues. Currently, most mud slurry testing during cutoff wall construction focuses on surface testing, failing to effectively extract and test mud slurry at different locations and depths within the trench. The density, viscosity, and sand content of the mud slurry cannot be adjusted promptly and effectively. Substandard mud slurry quality will severely impact the quality of the cutoff wall.

[0003] Existing technologies and equipment cannot effectively extract and test mud slurry at different locations and depths within the tank section, cannot test mud slurry pressure and viscosity in situ, are limited in the sedimentation section at the bottom of the tank section, and the slurry storage chamber is not tightly sealed. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an apparatus and method for in-situ sampling and testing of deep mud in a cutoff curtain, so as to solve the technical problems of difficulty in sampling mud slurry at different locations and depths in the cutoff curtain trench section, and the inability to test the in-situ pressure and viscosity of the slurry in the existing technology.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A device for in-situ sampling and testing of deep mud in a water-cutting curtain includes a slurry storage container. A guide head is detachably installed at the bottom of the slurry storage container. A sealing body is provided in the slurry storage container. The top of the sealing body is connected to one end of a connecting line. The other end of the connecting line extends out of the top of the slurry storage container and is connected to a data acquisition instrument.

[0007] The slurry storage device includes a tank body, on which pressure sensors are arranged on the bottom inner wall. A power system is arranged in the middle of the bottom inner wall of the tank body, and a viscosity tester is arranged on the top of the power system. A slurry inlet hole is opened on the top of the tank body. The diameter of the slurry inlet hole is smaller than the diameter of the sealing body.

[0008] The sealing body includes an upper hemispherical sealed shell and a lower hemispherical counterweight shell that are fixedly connected, and a cavity is formed between the upper hemispherical sealed shell and the lower hemispherical counterweight shell; a cable hole is provided at the top of the upper hemispherical sealed shell; and multiple liquid pressure sensors are provided on the bottom inner wall of the lower hemispherical counterweight shell.

[0009] The connecting line includes a signal cable. The upper end of the signal cable passes through the cable hole and the slurry inlet hole in sequence and is connected to the data acquisition instrument. The lower end of the signal cable is provided with multiple signal cable branches, each of which is connected to a liquid pressure sensor. A measuring rope is sleeved on the outside of the signal cable.

[0010] This invention also includes the following technical features:

[0011] A sealing ring is provided on the inner wall of the slurry inlet hole.

[0012] The bottom of the tank is provided with a male cone, and the top of the guide head is provided with a female cone that matches the male cone.

[0013] The guide head is a cone, and the taper of the guide head is β.

[0014] The taper β of the guide head is 60°.

[0015] The upper hemispherical sealed shell and the lower hemispherical counterweight shell are connected by welding or by thread.

[0016] The outer wall of the upper hemispherical sealed shell is covered with a flexible sealing material.

[0017] One or more layers of protective armor are provided between the signal cable and the measuring rope.

[0018] The pressure sensor is attached to the bottom inner wall of the tank by welding, bonding, or bolting.

[0019] A method for in-situ testing and inspection of deep mud in a water-cutting curtain, specifically including the following steps:

[0020] Step 1: Select a connecting line of length L and assemble the deep mud extraction and testing device, where L > H, and H is the depth of the cutoff curtain.

[0021] Step 2: The deep mud extraction and testing device is lowered into the excavated water-cutting curtain trench section. The cone tip at the bottom of the guide head moves downward under the action of gravity, overcoming the mud resistance. The upper hemispherical sealed shell of the sealing body fits tightly with the sealing ring.

[0022] Step 3: When the deep mud extraction and testing device reaches the bottom of the mud at the bottom of the intercepting curtain trench, stop lowering it and measure the depth H of the device entering the mud using the measuring rope of the connecting line. 测 H 测 At depth ≤H, under the action of the lower hemispherical counterweight shell, the sealing body moves downward, the upper hemispherical sealed shell separates from the sealing ring, and the mud on the outside of the slurry tank enters through the slurry inlet and fills the tank, achieving a depth of H. 测 In-situ mud at the location;

[0023] Wherein: H 测 This indicates the length of the measuring rope from the opening of the curtain groove to the top of the device for deep mud extraction and testing;

[0024] Step 4: The liquid pressure sensor monitors the mud liquid pressure P of the mud. n and the mud liquid pressure P n The signal is transmitted to the data acquisition unit via a branch of the signal cable.

[0025] Step 5: The data acquisition instrument processes and analyzes the received mud liquid pressure to obtain H. 测 Average value of mud fluid pressure Minimum value P of mud fluid pressure min =Min(P1、...、P) n The maximum pressure of the mud liquid, P max =Max(P1、...、P n );

[0026] when At that time, the mud liquid pressure at the mud extraction location when At that time, the mud liquid pressure at the mud extraction location

[0027] in:

[0028] n represents the number of liquid pressure sensors;

[0029] P n Indicates the first n Pressure values ​​from a liquid pressure sensor;

[0030] P 散 Represents P1, ..., P n Pressure values ​​with a dispersion exceeding 15%;

[0031] Step 6: Slowly lift the connecting line upwards. Under the lifting action of the connecting line, the sealing body seals the top slurry inlet of the slurry reservoir. The upper hemispherical sealed shell of the sealing body fits tightly with the sealing ring.

[0032] Step 7: The pressure sensor in the slurry tank measures the vertical pressure p of the slurry in the tank. 浆 and the vertical pressure p 浆 The data is transmitted to the data acquisition unit, which calculates H according to the following formula. 测 The density ρ of the mud at the location, and its comparison with the design requirement density value ρ. 标准 In comparison, if ρ ≤ ρ 标准 If the mud at that point is deemed acceptable, proceed to step eight. If ρ > ρ 标准 If so, the mud at that location is deemed substandard;

[0033]

[0034] in:

[0035] V represents the volume of the tank, V = πr 2 h 腔 ;

[0036] r represents the inner diameter of the tank;

[0037] h 腔 Indicates the height of the tank;

[0038] Step 8: The power system in the slurry reservoir drives the viscosity tester to rotate, and the viscosity value μ of the slurry in the slurry reservoir is measured. 测 The obtained mud viscosity value μ 测 The mud viscosity value μ required by the design 标准 In comparison, if μ 测 ≤μ 标准 If the mud is found to be in good condition, proceed to step nine. 测 >μ 标准 If so, the mud at that location is deemed substandard;

[0039] Step nine: Lift the slurry storage tank to the ground surface using the connecting cable, and pour the slurry from the tank through the top inlet. Test the viscosity μ of the slurry. 取 Density ρ 取 and sand content Sp;

[0040] Step 10, when μ 取 ≤μ 标准 Density ρ 取 ≤ρ 标准 And the sand content Sp≤Sp 标准 If the mud is in good condition, it is deemed acceptable; otherwise, it is deemed unacceptable.

[0041] Compared with the prior art, the beneficial technical effects of this invention are:

[0042] (I) This invention integrates functions such as deep mud sampling in the cutoff curtain trench section, efficient sealing of the mud storage device, in-situ online monitoring of slurry pressure, in-situ viscosity detection, accurate measurement of test depth, and real-time data acquisition through a slurry storage device, a conical base, a sealing body, a connecting line, a liquid pressure sensor, and a data acquisition instrument. This improves the accuracy of deep mud extraction and performance testing in the trench section, ensures the construction quality and water interception effect of the cutoff curtain, and solves the technical problems of difficulty in sampling mud slurry at different locations and depths in the cutoff curtain trench section and the inability to test the in-situ pressure and viscosity of the slurry in the existing technology.

[0043] (II) The guide head of the present invention has the functions of increasing weight, reducing penetration resistance and vertical guidance. During the process of mud release in the curtain trench section, the bottom cone tip effectively overcomes the mud resistance and increases the penetration depth of the entire device in the deep sediment section of the trench section, realizing the in-situ extraction and testing of the mud in the deep section of the trench.

[0044] (III) The sealing body, connecting line and slurry reservoir of the present invention realize accurate measurement of the slurry depth in the deep section of the trench, online monitoring of the slurry pressure, in-situ testing of viscosity, accurate calculation of slurry density and real-time transmission of test data, reducing test errors, reducing the workload of on-site testing, and ensuring the slurry test depth, test accuracy and in-situ authenticity. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0046] Figure 2 This is a cross-sectional schematic diagram of the slurry storage device in this invention;

[0047] Figure 3 This is a schematic diagram of the guide head in this invention;

[0048] Figure 4 The structure of the sealing body in this invention is shown in the schematic diagram;

[0049] Figure 5 This is a schematic diagram of the connecting line in the present invention;

[0050] Figure 6 This is a partial top view schematic diagram of the present invention;

[0051] Figure 7 This is a schematic diagram of the device of the present invention being lowered into the curtain trough section;

[0052] Figure 8 This is a schematic diagram of the device of the present invention being lowered into the test position in the curtain groove section.

[0053] The meanings of the labels in the diagram are as follows: 1-slurry reservoir, 2-guide head, 3-sealing body, 4-connecting line, 5-data acquisition instrument, 6-female cone;

[0054] 101-Tank body, 102-Pressure sensor, 103-Power system, 104-Viscosity tester, 105-Slurry inlet, 106-Male cone 106, 107-Sealing ring;

[0055] 301 - Upper hemispherical sealed shell, 302 - Lower hemispherical counterweight shell, 303 - Cable hole, 304 - Liquid pressure sensor;

[0056] 401 - Signal cable, 402 - Signal cable branch, 403 - Measurement rope, 404 - Protective armor.

[0057] The specific content of the present invention will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0058] It should be noted that, unless otherwise specified, all components in this invention are those known in the art.

[0059] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0060] This invention provides a device for in-situ sampling and testing of deep mud in a water-cutting curtain, including a mud storage device 1, a guide head 2 detachably installed at the bottom of the mud storage device 1, a sealing body 3 provided in the mud storage device 1, the top of the sealing body 3 being connected to one end of a connecting line 4, and the other end of the connecting line 4 extending out of the top of the mud storage device 1 and connected to a data acquisition instrument 5.

[0061] The slurry storage device 1 includes a tank body 101. A pressure sensor 102 is installed on the bottom inner wall of the tank body 101. A power system 103 is installed in the middle of the bottom inner wall of the tank body 1. A viscosity tester 104 is installed on the top of the power system 103. A slurry inlet hole 105 is opened on the top of the tank body 101. The diameter of the slurry inlet hole 105 is smaller than the diameter of the sealing body 3.

[0062] The sealing body 3 includes an upper hemispherical sealed shell 301 and a lower hemispherical counterweight shell 302 that are fixedly connected, and a cavity is formed between the upper hemispherical sealed shell 301 and the lower hemispherical counterweight shell 302; a cable hole 303 is provided at the top of the upper hemispherical sealed shell 301; and multiple liquid pressure sensors 304 are provided on the bottom inner wall of the lower hemispherical counterweight shell 302.

[0063] The connecting line 4 includes a signal cable 401. The upper end of the signal cable 401 passes through the cable hole 303 and the slurry inlet hole 105 in sequence and is connected to the data acquisition instrument 5. The lower end of the signal cable 401 is provided with multiple signal cable branches 402, and each signal cable branch 402 is connected to a liquid pressure sensor 304. A measuring rope 403 is sleeved on the outside of the signal cable 401.

[0064] The above technical solution integrates functions such as deep mud sampling in the cutoff curtain trench section, efficient sealing of the mud storage device, in-situ online monitoring of slurry pressure, in-situ viscosity detection, accurate measurement of test depth, and real-time data acquisition through a slurry storage device, a conical base, a sealing body, connecting lines, a liquid pressure sensor, and a data acquisition instrument. This improves the accuracy of deep mud extraction and performance testing in the trench section, ensures the construction quality and water interception effect of the cutoff curtain, and solves the technical problems of difficulty in sampling mud slurry at different locations and depths in the cutoff curtain trench section and the inability to test the in-situ pressure and viscosity of the slurry in the existing technology.

[0065] In addition, the guide head increases weight, reduces penetration resistance, and provides vertical guidance. During the slurry lowering process in the curtain trench section, the bottom cone tip effectively overcomes slurry resistance and increases the penetration depth of the entire device in the deep sediment section of the trench, enabling in-situ extraction and testing of deep slurry in the trench section. The sealing body, connecting line, and slurry reservoir enable accurate measurement of deep slurry depth in the trench section, online monitoring of slurry hydraulic pressure, in-situ testing of viscosity, accurate calculation of slurry density, and real-time transmission of test data, reducing test errors, reducing on-site testing workload, and ensuring the depth, accuracy, and in-situ authenticity of slurry testing.

[0066] The power system 103 includes a connected energy storage power supply and a motor. A viscosity tester 104 is fixedly mounted on the output shaft of the motor. The energy storage power supply drives the motor to rotate, and the motor drives the viscosity tester to rotate.

[0067] Specifically, a sealing ring 107 is provided on the inner wall of the slurry inlet hole 105.

[0068] Preferably, the sealing ring 107 is an O-ring 107. The sealing ring 107 fits tightly with the upper hemispherical sealed shell 301, blocking the top slurry inlet of the slurry storage tank and preventing the slurry from entering the tank 101 of the slurry storage tank 1 during the lowering of the device.

[0069] Specifically, the bottom of the tank body 101 is provided with a male cone 106, and the top of the guide head 2 is provided with a female cone 6 that matches the male cone 106.

[0070] Specifically, guide head 2 is a cone, and the taper of guide head 2 is β.

[0071] Specifically, the taper β of the guide head 2 is 60°. When the taper β is 60°, the resistance during the lowering process of the guide head 2 is minimal, and the penetration depth h into the sludge is maximized under the same weight, thus solving the problem of limited penetration depth of the device into the sludge in the prior art.

[0072] Specifically, the upper hemispherical sealed shell 301 and the lower hemispherical counterweight shell 302 are connected by welding or by thread.

[0073] Specifically, the outer wall of the upper hemispherical sealed shell 301 is wrapped with a flexible sealing material, which makes the upper hemispherical sealed shell 301 fit more tightly with the sealing ring.

[0074] Specifically, one or more layers of protective armor 404 are provided between the signal cable 401 and the measuring rope 403. The protective armor 404 protects the signal cable 401 from external damage, ensures that the signal cable 401 is not interfered with by external signals, and ensures the airtightness of the signal cable 401, isolating the signal cable 401 from the outside.

[0075] Specifically, the pressure sensor 102 is connected to the bottom inner wall of the tank 101 by welding, bonding or bolting.

[0076] A method for in-situ testing and inspection of deep mud in a water-cutting curtain, specifically including the following steps:

[0077] Step 1: Select connecting line 4 of length L and assemble the device for deep mud extraction and testing, where L > H, and H is the depth of the cutoff curtain.

[0078] Step 2: The deep mud extraction and testing device is lowered into the excavated water-cutting curtain trench section. The cone tip at the bottom of the guide head 2 moves downward under the action of gravity to overcome the mud resistance. The upper hemispherical sealed shell 301 of the sealing body 3 fits tightly with the sealing ring 107.

[0079] Step 3: When the deep mud extraction and testing device reaches the bottom of the mud at the bottom of the cutoff wall trench, stop lowering it and measure the depth H of the device entering the mud using the measuring rope 403 of the connecting line 4. 测 H 测 At depth H, under the action of the lower hemispherical counterweight shell 302, the sealing body 3 moves downward, and the upper hemispherical sealed shell 301 separates from the sealing ring 107. The mud outside the slurry tank 1 enters through the slurry inlet hole 105 and fills the tank body 101, achieving a depth H. 测 In-situ mud at the location;

[0080] Wherein: H 测 This indicates the length of the measuring rope from the opening of the curtain groove to the top of the device for deep mud extraction and testing;

[0081] Step 4: Liquid pressure sensor 304 monitors the mud liquid pressure P of the mud. n and the mud liquid pressure P n The signal is transmitted to the data acquisition unit 5 via signal cable branch 402;

[0082] Step 5: The data acquisition instrument 5 processes and analyzes the received mud liquid pressure to obtain H. 测 Average value of mud fluid pressure Minimum value P of mud fluid pressure min =Min(P1、...、P) n The maximum pressure of the mud liquid, P max =Max(P1、...、P n );

[0083] when At that time, the mud liquid pressure at the mud extraction location when At that time, the mud liquid pressure at the mud extraction location

[0084] in:

[0085] n represents the number of liquid pressure sensors;

[0086] P n This represents the pressure value of the nth liquid pressure sensor;

[0087] P 散 Represents P1, ..., P n Pressure values ​​with a dispersion exceeding 15%;

[0088] Step 6: Slowly lift the connecting line 4 upwards. Under the lifting action of the connecting line 4, the sealing body 3 seals the top slurry inlet 105 of the slurry reservoir 1. The upper hemispherical sealed shell 301 of the sealing body 3 is tightly fitted with the sealing ring 107.

[0089] Step 7: The pressure sensor 102 in the slurry reservoir 1 measures the vertical pressure p of the mud in the tank 101. 浆 and the vertical pressure p 浆 The data is transmitted to data acquisition unit 5, which calculates H according to the following formula. 测 The density ρ of the mud at the location, and its comparison with the design requirement density value ρ. 标准 In comparison, if ρ≤ρ 标准 If the mud at that point is deemed acceptable, proceed to step eight. If ρ > ρ 标准 If this happens, the mud at that location is deemed substandard and must be replaced.

[0090]

[0091] in:

[0092] V represents the volume of the tank, V = πr 2 h 腔 ;

[0093] r represents the inner diameter of the tank;

[0094] h 腔 Indicates the height of the tank;

[0095] Step 8: The power system 103 in the slurry reservoir 1 drives the viscosity tester 104 to rotate, and measures the viscosity value μ of the slurry in the slurry reservoir 1. 测 The obtained mud viscosity value μ 测 The mud viscosity value μ required by the design 标准 In comparison, if μ 测 ≤μ 标准 If the mud is found to be in good condition, proceed to step nine. 测 >μ 标准 If this happens, the mud at that location is deemed substandard and must be replaced.

[0096] Step nine: Lift the slurry storage tank 1 to the ground surface via the connecting line, and pour the slurry in the tank of the slurry storage tank 1 out through the top slurry inlet 105. Test the viscosity μ of the slurry. 取 Density ρ 取 and sand content Sp;

[0097] Step 10, when μ 取 ≤μ 标准 Density ρ 取 ≤ρ 标准 And the sand content Sp≤Sp 标准 If the mud is deemed acceptable, it is considered unacceptable; otherwise, it is deemed unacceptable and must be replaced.

[0098] In the above technical solution, ρ 标准 μ 标准 and Sp 标准 The specifications are set according to the specific content of the "Technical Specification for Construction of Underground Diaphragm Wall in Subway Foundation Pit, DB34 / T3951-2021".

[0099] Example 1:

[0100] This embodiment presents a method for in-situ sampling and testing of deep mud slurry within a water-cutting curtain. Specifically, in an open-pit coal mine in eastern Inner Mongolia, a water-cutting curtain was used to intercept lateral recharge of loose layer water outside the mine pit. The water-cutting curtain was 5 km long, with a depth H = 60 m and a width of 0.6 m. During the construction of the water-cutting curtain, to effectively inspect and monitor the quality of the mud slurry and the condition of sediment at the bottom of the curtain section, the device of this invention was used for in-situ sampling and testing of deep mud slurry. The specific steps include:

[0101] Step 1: Select a connecting line 4 with a length of L = 70 m, and assemble the device for deep mud extraction and inspection, where L > H, and H is the depth of the cut-off wall;

[0102] Step 2: Lower the device for deep mud extraction and inspection into the excavated cut-off wall slot section. The conical tip at the bottom of the guiding head 2 moves downward under the action of gravity to overcome the mud resistance, and the upper hemispherical sealed shell 301 of the sealing body 3 fits closely with the sealing ring 107;

[0103] Step 3: When the device for deep mud extraction and inspection reaches the bottom of the mud at the bottom of the cut-off wall slot, stop lowering, and measure the depth H into the mud through the sounding rope 403 of the connecting line 4 测 = 59.8 m, H 测 = 59.8 m < H = 60 m. At this time, under the action of the lower hemispherical counterweight shell 302, the sealing body 3 moves downward, and the upper hemispherical sealed shell 301 is separated from the sealing ring 107. The mud outside the slurry storage tank 1 enters and fills the tank body 101 through the slurry inlet hole 105, obtaining the in-situ mud at the depth H 测 ;

[0104] [[ID=1,7]]Where: H 测 represents the length of the sounding rope from the slot opening of the cut-off wall to the top of the device for deep mud extraction and inspection;

[0105] Step 4: The liquid pressure sensor monitors the mud liquid pressures P1 = 0.6578 MPa, P2 = 0.6583 MPa, P3 = 0.6575 MPa, and transmits the mud liquid pressures P1, P2, P3 to the data acquisition instrument through the signal cable branch;

[0106] Step 5: The data acquisition instrument processes and analyzes the received mud liquid pressures to obtain the average value of the mud liquid pressure at H 测 = 59.8 m, the minimum value P of the mud liquid pressure min = Min(P1, P2, P3) = 0.6575 MPa, the maximum value

[0107] P max = Max(P1, P2, P3) = 0.6583 MPa;

[0108] Since the mud liquid pressure at the mud extraction position

[0109]

[0110] Step 6: Slowly lift the connecting line 4 upwards. Under the lifting action of the connecting line 4, the sealing body 3 seals the top slurry inlet 105 of the slurry reservoir 1. The upper hemispherical sealed shell 301 of the sealing body 3 is tightly fitted with the sealing ring 107.

[0111] Step 7: The pressure sensor 102 in the slurry reservoir 1 measures the vertical pressure p of the mud in the tank 101. 浆 =226N, and the vertical pressure p 浆 The data is transmitted to data acquisition unit 5, which calculates H according to the following formula. 测 The mud density at a depth of 59.8m is ρ = 1.13 g / cm³. 3 and the density value ρ required by the design 标准 In comparison, since ρ = 1.13 g / cm³ 3 ≤ρ 标准 =1.15g / cm 3 The mud at this location is deemed acceptable, and the mud in this section of the tank can be used normally; proceed to step eight.

[0112]

[0113] in:

[0114] V represents the volume of the tank, V = πr 2 h 腔 =3.14×5 2 ×20=1570cm 3 ;

[0115] r represents the inner diameter of the tank, which is taken as 5cm;

[0116] h 腔 The height of the tank is 20cm.

[0117] Step 8: The power and storage system in the slurry reservoir drives the viscosity tester to rotate, measuring the viscosity value μ of the slurry in the reservoir. 测 =28 seconds, and the obtained mud viscosity value μ 测 The mud viscosity value μ required by the design 标准 ≤30 seconds of comparison, when μ 测 =28 seconds ≤ μ 标准 =After 30 seconds, the mud at that location is deemed acceptable, and proceed to step nine;

[0118] Step nine: Lift the slurry storage tank 1 to the ground surface via the connecting line, and pour the slurry in the tank of the slurry storage tank 1 out through the top slurry inlet 105. Test the viscosity μ. 取 =27 seconds, density ρ 取 =1.128g / cm 3 And sand content Sp = 5%;

[0119] Step 10, due to μ 取 =27 seconds ≤ μ 标准 =30 seconds, density ρ 取 =1.128g / cm 3 ≤ρ 标准 =1.15g / cm 3 And the sand content Sp = 5% ≤ Sp 标准 When the sediment content is 7%, the mud is considered qualified; otherwise, it is considered unqualified, and the sediment thickness is 20cm.

Claims

1. A method for in-situ sampling and testing of deep mud slurry in a cutoff wall, characterized in that, Specifically, the following steps are included: Step 1: Select a connecting line (4) of length L and assemble a device for in-situ sampling and testing of deep mud in the cutoff curtain, where L > H and H is the depth of the cutoff curtain. The device for in-situ sampling and testing of deep mud in the cutoff curtain includes a slurry reservoir (1), a guide head (2) is detachably installed at the bottom of the slurry reservoir (1), a sealing body (3) is provided in the slurry reservoir (1), the top of the sealing body (3) is connected to one end of a connecting line (4), and the other end of the connecting line (4) extends out of the top of the slurry reservoir (1) and is connected to a data acquisition instrument (5). The slurry storage device (1) includes a tank (101), a pressure sensor (102) is arranged on the bottom inner wall of the tank (101), a power system (103) is arranged in the middle of the bottom inner wall of the tank (101), and a viscosity tester (104) is arranged on the top of the power system (103); a slurry inlet hole (105) is opened on the top of the tank (101); the diameter of the slurry inlet hole (105) is smaller than the diameter of the sealing body (3); The sealing body (3) includes an upper hemispherical sealed shell (301) and a lower hemispherical counterweight shell (302) fixedly connected, forming a cavity between the upper hemispherical sealed shell (301) and the lower hemispherical counterweight shell (302); a cable hole (303) is provided at the top of the upper hemispherical sealed shell (301); and multiple liquid pressure sensors (304) are provided on the bottom inner wall of the lower hemispherical counterweight shell (302). The connecting line (4) includes a signal cable (401). The upper end of the signal cable (401) passes through the cable hole (303) and the slurry inlet hole (105) in sequence and is connected to the data acquisition instrument (5). The lower end of the signal cable (401) is provided with multiple signal cable branches (402). Each signal cable branch (402) is connected to a liquid pressure sensor (304). The signal cable (401) is covered with a measuring rope (403). A sealing ring (107) is provided on the inner wall of the slurry inlet hole (105). Step 2: The device for in-situ sampling and testing of deep mud in the cut-off curtain is placed in the excavated cut-off curtain trench section. The cone tip at the bottom of the guide head (2) moves downward under the action of gravity to overcome the mud resistance. The upper hemispherical sealed shell (301) of the sealing body (3) is tightly fitted with the sealing ring (107). Step 3: When the device for in-situ sampling and testing of deep mud in the cutoff curtain reaches the bottom of the mud at the bottom of the cutoff curtain trench, the lowering is stopped, and the depth into the mud is measured by the measuring rope (403) of the connecting line (4). , ≤H, at this time, the sealing body (3) moves down, the upper hemispherical sealed shell (301) separates from the sealing ring (107), and the mud outside the slurry tank (1) enters through the slurry inlet (105) and fills the tank (101), obtaining depth In-situ mud at the location; in: This indicates the length of the measuring rope from the opening of the curtain groove to the top of the device for deep mud extraction and testing; Step 4: The liquid pressure sensor (304) monitors the mud liquid pressure. and the pressure of the mud liquid The signal is transmitted to the data acquisition instrument (5) via a branch of the signal cable (402); Step 5: The data acquisition instrument (5) processes and analyzes the received mud liquid pressure to obtain... Average value of mud fluid pressure Minimum value of mud liquid pressure Maximum pressure of mud liquid ; when At that time, the mud liquid pressure at the mud extraction location ;when At that time, the mud liquid pressure at the mud extraction location ; in: Indicates the number of liquid pressure sensors; Indicates the first Pressure values ​​from a liquid pressure sensor; express ... Pressure values ​​with a dispersion exceeding 15%; Step 6: Slowly lift the connecting line upwards. Under the lifting action of the connecting line, the sealing body (3) seals the top slurry inlet (105) of the slurry reservoir (1). The upper hemispherical sealed shell (301) of the sealing body (3) fits tightly with the sealing ring (107). Step 7: The pressure sensor (102) in the slurry reservoir (1) measures the vertical pressure of the mud in the tank (101). and vertical pressure The data is transmitted to the data acquisition unit (5), which calculates the result according to the following formula. mud density at the location and the density value required by the design. In comparison, if If the mud is deemed acceptable, proceed to step eight. If so, the mud at that location is deemed substandard; in: Indicates the volume of the tank. ; Indicates the inner diameter of the tank; Indicates the height of the tank; Step 8: The power system (103) in the slurry reservoir (1) drives the viscosity tester (104) to rotate, and tests the viscosity value of the slurry in the slurry reservoir (1). and the obtained mud viscosity value Mud viscosity value as required by design In comparison, if If the mud is deemed acceptable, proceed to step nine. If so, the mud at that location is deemed substandard; Step nine: Lift the slurry storage tank (1) to the ground surface via the connecting line, and pour the slurry in the tank of the slurry storage tank (1) out through the top slurry inlet (105). Test the viscosity of the slurry. ,density and sand content ; Step 10, when ,density And sand content If the mud is in good condition, it is deemed acceptable; otherwise, it is deemed unacceptable.

2. The method for in-situ sampling and testing of deep mud slurry in a cutoff wall as described in claim 1, characterized in that, The bottom of the tank (101) is provided with a male cone (106), and the top of the guide head (2) is provided with a female cone (6) that matches the male cone (106).

3. The method for in-situ sampling and testing of deep mud slurry in a cutoff wall as described in claim 1, characterized in that, The guide head (2) is a cone, and the taper of the guide head (2) is... .

4. The method for in-situ sampling and testing of deep mud slurry in a cutoff wall as described in claim 3, characterized in that, The taper of the guide head (2) It is 60°.

5. The method for in-situ sampling and testing of deep mud slurry in a cutoff wall as described in claim 1, characterized in that, The upper hemispherical sealed shell (301) and the lower hemispherical counterweight shell (302) are connected by welding or by thread.

6. The method for in-situ sampling and testing of deep mud slurry in a cutoff wall as described in claim 1, characterized in that, The outer wall of the upper hemispherical sealed shell (301) is covered with a flexible sealing material.

7. The method for in-situ sampling and testing of deep mud slurry in a cutoff wall as described in claim 1, characterized in that, One or more layers of protective armor (404) are provided between the signal cable (401) and the measuring rope (403).

8. The method for in-situ sampling and testing of deep mud slurry in a cutoff wall as described in claim 1, characterized in that, The pressure sensor (102) is connected to the bottom inner wall of the tank (101) by welding, bonding or bolting.

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