Construction method of thin equal-thickness solidified soil diaphragm wall for water conservancy project

Abstract

The invention discloses a construction method of a thin equal-thickness solidified soil diaphragm wall for hydraulic engineering, which belongs to the technical field of hydraulic engineering and comprises the following steps: positioning, measuring and setting out, and excavating a guide groove; cutter rows are mounted on all sections of chains; a TRD main machine is in place, the first section of cutting box is connected with the main machine through a special conversion section, other cutting boxes are assembled, and all sections of chains are sequentially spliced through control of the main machine; the perpendicularity of the wall is controlled till the cutting box cuts to the designated depth; the cutting box conducts transverse cutting, cutting fluid is injected through the grouting pump, and a section of cutting groove length is formed; withdrawing the cutting box to a cutting starting point, and replacing the novel curing agent slurry; and the cutting box continues to transversely cut along the original route, the novel curing agent slurry is injected through the grouting pump, and a section of thin and equal-thickness solidified soil diaphragm wall is formed. According to the invention, the integrated effective monitoring of the perpendicularity and the center line positioning of the wall body is realized, and the continuity and the uniformity of the wall forming quality of the thin equal-thickness solidified soil diaphragm wall and the integrity of later drilling and coring are ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of water conservancy projects, and in particular relates to a construction method for a thin equal-thickness solidified soil anti-seepage wall for water conservancy projects. Background Art

[0002] As an important part of water conservancy projects, levee projects play a vital role in my country's flood control system. The stability of levee structures has a significant impact on the production and life safety of residents along the river. In order to prevent the risk of breaches in levee projects, anti-seepage reinforcement treatment is often required to improve the anti-seepage effect of levees and strengthen the quality of levees.

[0003] In recent years, water conservancy project embankment and anti-seepage projects have gradually begun to adopt the TRD method (continuous cement soil underground continuous wall method). The TRD method is a construction process that inserts a cutting box with a cutting chain into the soil layer, and injects a solidifying liquid while using the chain to rotate and push it horizontally into a groove, so that it is fully mixed with the original soil to form a continuous wall of constant thickness. The TRD method has the characteristics of adapting to a wide range of strata, high construction accuracy, and strong mechanical stability. The wall formed is seamless and has good water-stopping properties. However, in view of the complex site environment and narrow working surface of the reinforcement of water conservancy project embankments, the verticality of this process in the application of narrow water conservancy projects cannot meet the requirements of embankment anti-seepage projects.

[0004] In view of the above problems, the present invention proposes a construction method of a thin equal-thickness solidified soil anti-seepage wall for water conservancy projects to adapt to water conservancy project construction operations in more scenarios. Summary of the invention

[0005] In order to solve the technical problem of difficult-to-control verticality in the application of the existing TRD method in narrow water conservancy projects mentioned in the background technology, a construction method of a thin equal-thickness solidified soil anti-seepage wall for water conservancy projects is provided to solve the above problem.

[0006] To achieve the above object, the specific technical scheme of the construction method of the thin equal-thickness solidified soil anti-seepage wall for water conservancy projects of the present invention is as follows: A construction method for a thin equal-thickness solidified soil anti-seepage wall for a water conservancy project comprises the following steps: S1. Positioning, measuring and laying out, and excavating guide grooves; S2, install the knife row on each chain section; S3, TRD host in place, connect the first section of cutting box to the host through a special conversion section, assemble the remaining cutting boxes, and splice each section of chain in turn through the host control; S4, control the verticality of the wall until the cutting box cuts to the specified depth; S5, the cutting box performs transverse cutting, and the cutting fluid is injected through the grouting pump to form a section of cutting groove length; S6, the cutting box is withdrawn to the cutting starting point, and a new curing agent slurry is replaced; S7. The cutting box continues to cut horizontally along the original route, and injects the new curing agent slurry through the grouting pump to form a section of thin uniform thickness solidified soil anti-seepage wall.

[0007] Further, in S3, the thickness of the cutting box is 200~400mm, the knife row includes a single-tooth knife row, a double-tooth knife row, a three-tooth knife row and a four-tooth knife row, the width of the knife row is 350~400mm, the width of the tooth is 2~3cm, and the length is 8~10cm. The teeth of each group of knife rows are arranged alternately.

[0008] Furthermore, in S5, the cutting fluid is a bentonite mixture, the dosage is 25-30 kg / m3, the water-binder ratio is controlled at 15-20:1, and the fluidity of the cutting fluid mixed mud is controlled at 135 mm-240 mm.

[0009] Further, in S5, the lateral cutting speed of the cutting box is controlled at 0.2-2 m / h.

[0010] Furthermore, in S6, the new curing agent slurry is prepared by adding water to a soft soil curing agent, wherein the soft soil curing agent includes 10-30% cement clinker, 20-40% volcanic ash materials, 30-70% industrial waste residue and 0.3-2% chemical activator.

[0011] Further, in S7, the lateral cutting speed of the cutting box is controlled at 1-3 m / h; and the linear speed of the chain is controlled at 60-70 m / min.

[0012] Further, in S4, controlling the verticality of the wall includes: installing an IoT inclinometer on each cutting box, each IoT inclinometer is connected to the control system via a Bluetooth or WIFI signal, and the control system obtains the total offset of the cutting through the angle of each IoT inclinometer, and then obtains the verticality of the wall.

[0013] Furthermore, the total offset is calculated as: ; in, is the total offset, For the Section cutting box offset; in, , For the The length of the cutting box in the vertical direction, For the The angle measured by the IoT inclinometer on the cutting box.

[0014] Furthermore, in S4, controlling the verticality of the wall includes fusing multi-source data through the Kalman filter algorithm, tracking the verticality and centerline deviation of the TRD equipment in real time, using gyroscopes and inclination sensors to collect the inclination angle and dynamic change rate of the cutting in real time, collecting construction trajectory data through GNSS equipment, and combining geomagnetic sensors and inertial navigation systems to obtain the centerline position deviation.

[0015] Furthermore, in S4, controlling the verticality of the wall includes deploying multiple high-sensitivity ultrasonic transmitting and receiving modules in the operating equipment of the TRD host, using the sound wave propagation time difference and waveform attenuation analysis to monitor the verticality of the wall during the operation of the equipment, and installing a low-frequency sound wave positioning system on the TRD host to obtain the centerline position of the equipment in real time, and calculate the centerline offset of the equipment during the construction process through multi-point positioning.

[0016] The construction method of the thin equal-thickness solidified soil anti-seepage wall for water conservancy projects of the present invention has the following advantages: The grouting wall forming method of the present invention uses a new curing agent slurry instead of traditional cement, which is low-carbon, environmentally friendly and can achieve resource utilization. Under the condition of the same treatment effect, the cost of the new curing agent slurry is much lower than that of traditional cement, saving engineering costs.

[0017] The present invention realizes effective monitoring of the verticality of the wall and the integrated centerline positioning through precise control of the verticality of the wall, thereby ensuring the continuity and uniformity of the quality of the thin and equal-thickness solidified soil anti-seepage wall and the integrity of the subsequent drilling and coring.

[0018] The invention can be applied to anti-seepage reinforcement treatment of dikes, earth dams, reservoir embankments, foundation anti-seepage of hydraulic structures, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a flow chart of the construction method of a thin equal-thickness solidified soil anti-seepage wall for water conservancy projects. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0021] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0022] Please refer to the attached Figure 1 The invention describes a construction method of a thin equal-thickness solidified soil anti-seepage wall for a water conservancy project.

[0023] like Figure 1 As shown, the construction method of the thin equal-thickness solidified soil anti-seepage wall for water conservancy projects of the present invention comprises the following steps: S1. Positioning, measuring and laying out, and excavating the guide groove. The depth of the guide groove is controlled at 1~1.5m, and the width is controlled at 0.6~0.8m.

[0024] S2. Install the knife row on each chain section. The knife row has 6 specifications, including single-tooth, double-tooth, triple-tooth and quad-tooth. The width of the knife row is 350~400mm, the width of the teeth is 2~3cm, and the length is 8~10cm. The teeth of each set of knife rows are staggered to ensure uniform cutting within the width range.

[0025] S3, TRD host is in place, the first section of the cutting box is connected to the host through a special conversion section, the remaining cutting boxes are assembled, and the chain sections are spliced ​​in sequence through the host control. In a specific embodiment, the thickness of the TRD anti-seepage wall is 400mm, and the cutting box can be selected with a thickness of 200~400mm according to the construction situation. The cutting length each time is 0.3~0.5m longer than the length of the wall, so as to leave a certain amount of activity space for the cutting box to prevent the knife from getting stuck.

[0026] S4. Control the verticality of the wall until the cutting box cuts to a specified depth. Specifically, the verticality of the wall should not be greater than 1 / 250.

[0027] In a specific implementation, the verticality of the wall is controlled by installing an IoT inclinometer on each cutting box. Each IoT inclinometer is connected to the control system via a Bluetooth or WIFI signal. The control system obtains the total offset of the cutting through the angle of each IoT inclinometer, and then obtains the verticality of the wall, thereby accurately locating the center line of the wall. The calculation formula for the total offset is: ; in, is the total offset, For the Section cutting box offset; in, , For the The length of the cutting box in the vertical direction, For the The angle measured by the IoT inclinometer on the cutting box.

[0028] In another specific embodiment, the multi-source data can also be fused and processed through the Kalman filter algorithm to track the verticality and centerline deviation of the TRD equipment in real time, thereby controlling the verticality of the wall, using the gyroscope and inclination sensor to collect the inclination angle and dynamic change rate of the cutting in real time, and using the GNSS device to collect construction trajectory data, combined with the geomagnetic sensor and inertial navigation system to obtain the centerline position deviation. This method can improve the accuracy and reliability of multi-sensor data fusion, and is particularly suitable for data processing and deviation detection in complex environments during construction. The specific implementation method is: S101, denoising the original sensor data, removing obvious outliers, and unifying the timestamps and coordinate systems of data from different sensors to ensure the temporal and spatial consistency of the data; S102, perform Kalman filter modeling: First, define the state variables: Define a dynamic model for verticality and centerline deviation during construction: in, is the current vertical angle, is the vertical angular velocity, is the center line deviation.

[0029] Secondly, establish the state transfer equation: According to the physical characteristics of the TRD construction process, establish the state transfer equation: in, is the state transfer matrix, For control input (such as tool head adjustment parameters), is the process noise.

[0030] Next, establish the observation equation: Use the sensor measurement value to establish the observation equation: in, is the observation matrix, is the observation noise.

[0031] S103, filtering and outputting the verticality result; Predict the current state: predict the verticality and centerline deviation values ​​based on the state transfer equation; Update observation data: Update the predicted value through sensor data and correct the deviation; Output fusion results: obtain accurate verticality and centerline deviation data and store them in the database.

[0032] This method can combine the trend of filtered data and use the predictive ability of Kalman filtering to give early warning of impending over-limit deviations, thereby improving the accuracy of verticality and centerline deviation monitoring during construction, thereby improving the quality of the cut-off wall, and reducing the difficulty of manual intervention and monitoring, achieving full intelligent quality control of the construction process, and reducing construction rework caused by over-limit deviations through deviation prediction and early warning, thereby improving construction efficiency and economic benefits.

[0033] In other specific embodiments, the verticality of the wall can also be detected by non-contact acoustic positioning, so as to control the verticality of the wall. By deploying multiple high-sensitivity ultrasonic transmitting and receiving modules in the operating equipment of the TRD host, the verticality of the wall during the operation of the equipment is monitored by using the sound wave propagation time difference and waveform attenuation analysis, and installing a low-frequency sound wave positioning system on the TRD host to obtain the centerline position of the equipment in real time, and calculate the centerline offset of the equipment during the construction process through multi-point positioning. The specific implementation method is as follows: Multiple high-sensitivity ultrasonic transmitting and receiving modules are deployed in the operating equipment of the TRD host, and the verticality of the wall during the operation of the monitoring equipment is analyzed by using the difference in sound wave propagation time and waveform attenuation; Through real-time monitoring at the receiving end, the deviation between any point on the wall and the ideal vertical plane is calculated; the time difference Δt and propagation speed of ultrasonic waves reaching different sensors are used , calculate the vertical deviation: Where d is the offset of the current point on the wall relative to the vertical plane. When the deviation value exceeds 1 / 250, the system issues a vertical deviation alarm and adjusts the TRD device angle in real time.

[0034] In order to control the deviation of the center line of the wall, a low-frequency acoustic wave positioning system is installed on the TRD host to obtain the center line position of the equipment in real time, and calculate the deviation of the equipment relative to the ideal center line during the construction process through multi-point positioning; The quantum adaptive optimization model (QAOA) is introduced, which takes acoustic positioning data as input, dynamically adjusts the weight and search path of the optimization model according to the current construction status, and outputs the optimal deviation compensation value; Objective Function Expresses minimization of perpendicularity and centerline deviation: ; Among them, w is the weight vector, which is dynamically updated through quantum computing; The received data needs to be adaptively filtered and compensated for noise. The high-precision acoustic wave filtering module is used to perform real-time noise reduction on the environmental noise to ensure the accuracy of data collection. At the same time, the acoustic wave signal is adaptively compensated for noise to optimize the signal transmission quality: in, is the net signal after compensation, is the original signal, is the noise intensity, is the compensation coefficient; Finally, real-time deviation alarm and intelligent feedback control are carried out: Verticality detection: When the deviation value exceeds 1 / 250, the system will issue a vertical deviation alarm and adjust the TRD equipment angle in real time.

[0035] Centerline detection: When the deviation value exceeds the set threshold, the centerline correction prompt is triggered, and the device is guided back to its original position through the acoustic array.

[0036] S5. The cutting box is used for transverse cutting, and cutting fluid is injected through a grouting pump to form a cutting groove. The cutting fluid is a bentonite mixture with a dosage of 25-30 kg / m3 and a water-binder ratio of 15-20:1. The fluidity of the cutting fluid mixed slurry should be controlled at 135 mm to 240 mm, and the transverse cutting speed of the cutting box is controlled at 0.2-2 m / h.

[0037] S6. The cutting box is withdrawn to the starting point of cutting, and the new curing agent slurry is replaced; the withdrawal speed of the cutting box should be controlled at 5~8m / h. The new curing agent slurry is prepared on-site by adding water to the soft soil curing agent according to a certain water-cement ratio. The soft soil curing agent includes 10~30% cement clinker, 20~40% volcanic ash materials and 30~70% industrial waste slag and 0.3~2% chemical activator, among which the volcanic ash materials include fly ash, volcanic ash, etc.; industrial waste slag includes slag, steel slag, high calcium fly ash, phosphorus slag, nickel slag, etc.; chemical activators include alkali metal oxides or hydroxides, aluminates, etc. At the same time, it can be understood that in special construction conditions, the new curing agent slurry can also be replaced by cement.

[0038] In order to prove that the new curing agent slurry can replace cement for construction, the present invention carried out core sampling quality inspection on the thin equal-thickness cured soil anti-seepage wall formed by using the new curing agent slurry with a dosage of 12%, the thin equal-thickness cured soil anti-seepage wall formed by using the new curing agent slurry with a dosage of 16%, and the thin equal-thickness cured soil anti-seepage wall formed by using the new curing agent slurry with a dosage of 20%.

[0039] Among them, ZK1 was cored from a thin and equal-thickness solidified soil anti-seepage wall formed by using a 12% dosage of the new curing agent slurry; ZK2 was cored from a thin and equal-thickness solidified soil anti-seepage wall formed by using a 16% dosage of the new curing agent slurry; ZK3 was cored from a thin and equal-thickness solidified soil anti-seepage wall formed by using a 20% dosage of the new curing agent slurry. The width of the anti-seepage wall was visually detected by the excavation measurement method. The width of the anti-seepage wall was between 400 and 420 mm, as shown in Table 1, which is a summary of the core sample compressive strength test results; as shown in Table 2, it is a core sample permeability test result table, and as shown in Table 3, it is a core sample elastic modulus test result table.

[0040] Table 1 Compressive strength test results of anti-seepage wall core samples Table 2 Test results of permeability coefficient of anti-seepage wall core sample Table 3 Elastic modulus test results of anti-seepage wall core samples According to Tables 1 to 3, the range and average values ​​of the compressive strength of the thin and equal-thickness solidified soil anti-seepage wall formed by the new solidifying agent slurry are 1.4-2.2 MPa and 1.8 MPa, respectively, and the overall compressive strength meets the reinforcement requirements; the range and average values ​​of the permeability coefficient of the thin and equal-thickness solidified soil anti-seepage wall formed by the new solidifying agent slurry are 0.25×10 -7 ~0.92×10 -7 cm / s, 0.47×10 -7 cm / s, meeting the anti-seepage requirements; the sampled elastic modulus range and average values ​​of the thin and equal-thickness solidified soil anti-seepage wall formed by the new curing agent slurry are 101-174MPa and 135MPa, respectively, and the calculated modulus-to-strength ratio range and average values ​​are 53-83 and 66, respectively, meeting the reinforcement requirements. Therefore, the thin and equal-thickness anti-seepage wall formed by the new curing agent slurry is more economical in the present invention, which greatly saves the engineering cost while ensuring the reinforcement and anti-seepage requirements.

[0041] S7. The cutting box continues to cut horizontally along the original route, and injects the new curing agent slurry through the grouting pump to form a thin section of equal-thickness solidified soil anti-seepage wall. The horizontal cutting speed of the cutting box is controlled at 1~3m / h; the chain line speed is controlled at 60~70m / min, and the wall length is 0.3~0.5m less than the cutting groove. The purpose is to leave a certain amount of space for the cutting box to prevent the knife from getting stuck.

[0042] Preferably, the grouting pressure of the grouting pump is controlled at 0.6~0.8Mpa; the grouting pump adopts a variable frequency pump, and the grouting flow rate is matched with the mixing amount, thereby ensuring the smoothness of the grouting.

[0043] The grouting wall forming method of the present invention uses a new curing agent slurry instead of traditional cement, which is low-carbon, environmentally friendly and can achieve resource utilization. Under the condition of the same treatment effect, the cost of the new curing agent slurry is much lower than that of traditional cement, saving engineering costs and having higher economic and social benefits.

[0044] The present invention realizes effective monitoring of the verticality of the wall and the integrated centerline positioning through precise control of the verticality of the wall, thereby ensuring the continuity and uniformity of the quality of the thin and equal-thickness solidified soil anti-seepage wall and the integrity of the subsequent drilling and coring.

[0045] The invention can be applied to anti-seepage reinforcement treatment of dikes, earth dams, reservoir embankments, foundation anti-seepage of hydraulic structures, etc.

[0046] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A construction method for a thin equal-thickness solidified soil anti-seepage wall for a water conservancy project, characterized in that: The following steps are involved: S1. Positioning, measuring and laying out, and excavating guide grooves; S2, install the knife row on each chain section; S3, TRD host in place, connect the first section of cutting box to the host through a special conversion section, assemble the remaining cutting boxes, and splice each section of chain in turn through the host control; S4, control the verticality of the wall until the cutting box cuts to the specified depth; S5, the cutting box performs transverse cutting, and the cutting fluid is injected through the grouting pump to form a section of cutting groove length; S6, the cutting box is withdrawn to the cutting starting point, and a new curing agent slurry is replaced; S7. The cutting box continues to cut horizontally along the original route, and injects the new curing agent slurry through the grouting pump to form a section of thin uniform thickness solidified soil anti-seepage wall.

2. The construction method of thin equal-thickness solidified soil anti-seepage wall for water conservancy projects according to claim 1 is characterized in that: In S3, the thickness of the cutting box is 200~400mm, the knife rows include single-tooth knife rows, double-tooth knife rows, three-tooth knife rows and four-tooth knife rows, the width of the knife row is 350~400mm, the width of the teeth is 2~3cm, and the length is 8~10cm. The teeth of each set of knife rows are staggered.

3. The construction method of thin equal-thickness solidified soil anti-seepage wall for water conservancy projects according to claim 1 is characterized in that: In S5, the cutting fluid is a bentonite mixture with a dosage of 25~30kg / cubic meter, the water-binder ratio is controlled at 15~20:1, and the fluidity of the cutting fluid mixed mud is controlled at 135mm~240mm.

4. The construction method of thin equal-thickness solidified soil anti-seepage wall for water conservancy projects according to claim 1, characterized in that: In S5, the lateral cutting speed of the cutting box is controlled at 0.2~2m / h.

5. The construction method of thin equal-thickness solidified soil anti-seepage wall for water conservancy projects according to claim 1, characterized in that: In S6, the new curing agent slurry is prepared by adding water to a soft soil curing agent, wherein the soft soil curing agent includes 10-30% cement clinker, 20-40% volcanic ash materials, 30-70% industrial waste residue and 0.3-2% chemical activator.

6. The construction method of thin equal-thickness solidified soil anti-seepage wall for water conservancy projects according to claim 1, characterized in that: In S7, the lateral cutting speed of the cutting box is controlled at 1~3m / h; the chain line speed is controlled at 60~70m / min.

7. The construction method of thin equal-thickness solidified soil anti-seepage wall for water conservancy projects according to claim 1, characterized in that: In S4, controlling the verticality of the wall includes: installing an IoT inclinometer on each cutting box, each IoT inclinometer is connected to the control system via a Bluetooth or WIFI signal, and the control system obtains the total offset of the cutting through the angle of each IoT inclinometer, and then obtains the verticality of the wall.

8. The construction method of thin equal-thickness solidified soil anti-seepage wall for water conservancy projects according to claim 7, characterized in that: The total offset is calculated as: ； in, is the total offset, For the Section cutting box offset; in, , For the The length of the cutting box in the vertical direction, For the The angle measured by the IoT inclinometer on the cutting box.

9. The construction method of thin equal-thickness solidified soil anti-seepage wall for water conservancy projects according to claim 1, characterized in that: In S4, controlling the verticality of the wall includes fusing multi-source data through the Kalman filter algorithm, tracking the verticality and centerline deviation of the TRD equipment in real time, using gyroscopes and inclination sensors to collect the inclination angle and dynamic change rate of the cutting in real time, collecting construction trajectory data through GNSS equipment, and combining geomagnetic sensors and inertial navigation systems to obtain the centerline position deviation.

10. The construction method of thin equal-thickness solidified soil anti-seepage wall for water conservancy projects according to claim 1, characterized in that: In S4, controlling the verticality of the wall includes deploying multiple high-sensitivity ultrasonic transmitting and receiving modules in the operating equipment of the TRD host, using the sound wave propagation time difference and waveform attenuation analysis to monitor the verticality of the wall during the operation of the equipment, and installing a low-frequency sound wave positioning system on the TRD host to obtain the centerline position of the equipment in real time, and calculate the centerline offset of the equipment during the construction process through multi-point positioning.

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