Ground subsidence area grouting filling and stratum lifting construction process

Abstract

The application discloses a ground subsidence area grouting filling and stratum lifting construction process and relates to the technical field of subsidence repair. The application comprises the following steps: ground subsidence area geological survey, obtaining stratum structure, rock-soil characteristics, underground water level condition and determining subsidence causes; designing a grouting scheme according to the measurement results and the like. Through the on-site geological survey of the ground subsidence area and the calculation of the grouting amount and the grouting pressure, the application can conduct targeted grouting construction, avoid the occurrence of excessive lifting or insufficient lifting, thus guaranteeing the construction quality and the safety of the surrounding environment, solving the ground subsidence problem, collecting data in real time during the grouting construction, analyzing the stratum lifting condition and the grouting effect, adjusting the grouting parameters and the construction scheme in a timely manner through the change trend of the monitoring data, and ensuring the effect and safety of the stratum lifting.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of settlement repair, in particular to a ground settlement area grouting filling and stratum lifting construction process. BACKGROUND

[0002] With the continuous acceleration of urbanization process, the scale of urban construction is expanding, and a large number of high-rise buildings, underground engineering, rail transit and other infrastructure construction have brought great pressure on the stratum. At the same time, the increase of urban population also leads to overexploitation of water resources and decline of groundwater level, which may cause ground settlement. Ground settlement will bring many hazards to the city, such as building inclination, cracking, underground pipeline rupture, road collapse, etc., which seriously affect the safety and normal operation of the city. Therefore, effective measures need to be taken to control ground settlement.

[0003] At present, the existing ground settlement area lifting process lacks reasonable design of grouting parameters, and lacks real-time monitoring of ground lifting and settlement, which cannot accurately reflect the actual changes of the ground, thereby affecting the judgment of the lifting effect by the construction personnel, and it is difficult to adjust the construction parameters in time, thereby affecting the effect of grouting filling and lifting. SUMMARY

[0004] The purpose of the present application is to provide a ground settlement area grouting filling and stratum lifting construction process to solve the problems raised in the background art.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a ground settlement area grouting filling and stratum lifting construction process, comprising the following steps:

[0006] S1, settlement area geological survey: detailed on-site geological survey of the ground settlement area, obtaining stratum structure, rock-soil characteristics, groundwater level, and determining the settlement cause;

[0007] S2, designing a grouting scheme according to the measurement results, including selection of grouting materials, calculation of grouting amount and grouting pressure, arrangement of grouting holes, and preparation before construction;

[0008] The calculation of the grouting amount and the grouting pressure comprises the following steps:

[0009] S21, determining the specific height h to be lifted through the data of the settlement monitoring points;

[0010] S22, calculating the grouting amount, the grouting amount calculation formula is:

[0011] V=Mxh;

[0012] Wherein, V is the required grouting amount, unit is m 3 , M is the area of the grouting range, unit is m2 h is the height of the uplift after grouting, unit is m;

[0013] S23, calculate the grouting pressure to ensure sufficient pressure to push the slurry into the soil but not cause soil damage, the calculation formula is as follows:

[0014]

[0015] Wherein, P is the grouting pressure, unit is pa; F is the applied force, unit is N, which is calculated according to the power of grouting equipment divided by the flow rate of grouting material, the power of grouting equipment unit is W, the flow rate of grouting material unit is m / s; A is the area of grouting hole, unit is m 2 ;

[0016] S3, grouting hole construction: according to the design scheme, use measuring instruments to mark and position the grouting hole, use drilling machine to drill and clean the hole;

[0017] S4, grouting construction: prepare grouting material and test its performance, confirm it, and inject the prepared grouting material into the grouting hole through the grouting pump;

[0018] S5, stratum uplift monitoring: install monitoring equipment in the ground subsidence area and the surrounding area, real-time collect data in the grouting construction, analyze the stratum uplift situation and grouting effect;

[0019] S6, post-construction processing: after the completion of grouting construction, clean up the construction site, and test the quality of grouting effect.

[0020] Further, in step S1, the field geological exploration includes the following steps:

[0021] S11, use surveying equipment to conduct detailed topographic surveying of the subsidence area, and obtain the ground elevation change data;

[0022] S12, arrange drilling holes in the subsidence area, obtain rock and soil samples through drilling, and conduct field and laboratory tests;

[0023] S13, set up underground water level monitoring wells at key positions, measure the change of underground water level regularly, and record the water level historical data;

[0024] S14, draw a geological profile according to the drilling data, show the stratum composition, thickness and their mutual relationship at different depths, and analyze each level of soil.

[0025] Further, in step S3, the use of measuring instruments to mark and position the grouting hole includes the following steps:

[0026] S31, using a total station, GPS receiver or level, referring to the layout of the grouting hole, determine the coordinate position of each grouting hole;

[0027] S32, use obvious markers to mark the center point of the grouting hole at each position;

[0028] S33, secondary measurement by total station, GPS receiver or level to ensure the accuracy and reliability of the hole marking;

[0029] S34, if the position error is found, adjust the marking position in time and confirm again.

[0030] Further, in step S3, the flow of hole cleaning process is: during drilling, use high-pressure water gun or air compressor to remove mud and loose material in the hole, after completing the hole cleaning, use depth gauge and pencil mark to confirm the depth of the hole.

[0031] Further, in step S4, the preparation of grouting material and performance test, confirmation includes the following steps:

[0032] S41, use mechanical stirring tools to fully mix the raw materials of grouting material to form a uniform slurry;

[0033] S42, take slurry sample for performance test, test the initial reaction time, foaming and curing time and expansion characteristics of grouting material;

[0034] S43, record the results of each performance test, confirm whether the grouting material is qualified;

[0035] S44, after passing, the slurry is injected into the grouting machine for grouting operation.

[0036] Further, in step S4, during the grouting construction process, when the grouting pressure suddenly rises or overflows, stop grouting immediately, continue grouting after the slurry solidifies into solid and closes the grouting gap, when the grouting pressure suddenly drops, increase the slurry concentration or use intermittent grouting method.

[0037] Further, in step S5, the stratum uplift monitoring includes the following steps:

[0038] S51, use settlement observation instrument to accurately measure ground subsidence and uplift, install strain gauge in the section under load to monitor the stress state of soil in real time;

[0039] S52, use electronic level or total station with data acquisition system to realize real-time automatic recording of data;

[0040] S53, use K-means clustering analysis to identify the settlement characteristics under different conditions.

[0041] S54, analyze the change trend of the monitoring data, identify the dynamic change of the stratum, and predict the future subsidence / lifting trend;

[0042] S55, generate a monitoring report and feedback, and adjust the grouting construction scheme according to the monitoring results.

[0043] Compared with the prior art, the beneficial effects of the present application are:

[0044] 1. In the method, through on-site geological exploration of the ground subsidence area, detailed geological exploration and calculation of grouting amount and grouting pressure, targeted grouting construction can be carried out, the stratum can be effectively lifted, and the problem of ground subsidence can be solved. Real-time collection of data during grouting construction, analysis of stratum lifting condition and grouting effect, and analysis of change trend of monitoring data can timely adjust grouting parameters and construction scheme, and ensure the effect and safety of stratum lifting.

[0045] 2. In the method, the specific height to be lifted is determined to provide a basis for calculation of grouting amount, and reasonable calculation of grouting amount and grouting pressure can ensure that the stratum lifting effect meets the design requirements, avoid over-lifting or insufficient lifting, improve the efficiency and effect of grouting construction, and ensure the stability and uniformity of stratum lifting.

[0046] 3. In the method, the grouting parameters are adjusted in time according to the change of grouting pressure to ensure the safety and effect of grouting construction, and when the pressure suddenly rises or grout overflows, grouting is stopped to avoid soil damage and grout waste; when the pressure suddenly drops, appropriate measures are taken to ensure the continuity and stability of grouting. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 The flowchart of the grouting filling and stratum lifting construction process in the ground subsidence area of the present application. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0049] Please refer to Figure 1 A grouting filling and stratum lifting construction process in a ground subsidence area, comprising the following steps:

[0050] S1, subsidence area geological survey: detailed field geological survey of the ground subsidence area, obtain stratum structure, rock-soil characteristics, groundwater level, determine the subsidence cause;

[0051] The field geological survey includes the following steps:

[0052] S11, using surveying and mapping equipment, detailed topographic mapping of the subsidence area, obtaining surface elevation change data, accurately obtaining surface elevation change data, the mapping range should cover the entire subsidence area and its surrounding certain buffer zone to ensure the integrity of the data, obtaining surface elevation change data is the core goal of this work, through multiple measurements and data comparison, accurately obtaining the surface elevation change of each measurement point, providing intuitive basis for determining the ground subsidence range and degree, helping to understand the overall topographic conditions of the subsidence area, providing basic topographic information for the design of subsequent construction plans;

[0053] S12, drill holes in the subsidence area, obtain rock-soil samples through drilling, conduct field and laboratory tests, through the testing of rock-soil samples, the structure of the stratum and the physical and mechanical properties of the rock-soil can be deeply understood; the depth of the drill hole should be determined according to the preliminary estimation of the subsidence depth and the empirical data under similar geological conditions in the surrounding area, to ensure that it can penetrate all strata that may be involved, and part of the samples are properly packaged and sent to a professional laboratory for more in-depth physical and mechanical property testing, including but not limited to rock-soil density, porosity, compressive strength, shear strength, etc. Through these tests, the structure of the stratum and the physical and mechanical properties of the rock-soil can be deeply understood, providing key basis for the selection of subsequent grouting materials and the design of grouting parameters.

[0054] S13, set up groundwater level monitoring wells at key locations, measure the change of groundwater level regularly, record the water level history data; these key locations include possible groundwater recharge area, runoff area and discharge area, and areas with more serious subsidence. The depth of the monitoring well should penetrate the aquifer to ensure that the change of groundwater level can be accurately measured.

[0055] S14, according to the drilling data, draw the geological profile, show the stratum composition, thickness and their mutual relationship at different depths, analyze the soil at different levels, in the profile, clearly show the distribution of stratum composition at different depths, such as sand layer, soil layer, rock layer, etc., as well as the accurate thickness of each layer and their mutual relationship, so that construction personnel can intuitively understand the stratum structure, providing important reference for the arrangement of grouting holes, the selection of grouting materials and the determination of grouting pressure;

[0056] S2, design the grouting scheme according to the measurement results, including the selection of grouting materials, the calculation of grouting quantity and grouting pressure, the arrangement of grouting holes, and the preparation before construction; the calculation of reasonable grouting quantity and grouting pressure can ensure that the ground uplift effect meets the design requirements, which can ensure that the ground uplift effect meets the design requirements, effectively avoid the situation of excessive uplift or insufficient uplift, and thus guarantee the construction quality and the safety of the surrounding environment;

[0057] The calculation of the grouting quantity and the grouting pressure comprises the following steps:

[0058] S21, determine the specific height h that needs to be lifted through the data of the settlement monitoring points;

[0059] S22, calculate the grouting quantity, and the grouting quantity calculation formula is:

[0060] V=Mxh;

[0061] Wherein, V is the required grouting quantity, unit is m 3 , M is the area of the grouting range, unit is m 2 , h is the height that needs to be lifted after grouting, unit is m;

[0062] S23, calculate the grouting pressure to ensure sufficient pressure rise to push the slurry into the soil but not cause soil damage, and the calculation formula is as follows:

[0063]

[0064] Wherein, P is the grouting pressure, unit is pa; F is the applied force, unit is N, which is calculated according to the power of the grouting equipment divided by the flow speed of the grouting material, the power of the grouting equipment unit is W, and the flow speed of the grouting material unit is m / s; A is the area of the grouting hole, unit is m 2 .

[0065] S3, grouting hole construction: according to the design scheme, use measuring instruments to mark and position the grouting holes, use drilling machines to drill holes and clean the holes to ensure that the arrangement of the grouting holes meets the design requirements. It can improve the accuracy and effect of grouting, avoid the problems of uneven grouting or missed grouting caused by hole position deviation;

[0066] The process of using measuring instruments to mark and position the grouting holes is as follows:

[0067] S31, use high-precision measuring equipment to determine the coordinate position of each grouting hole according to the arrangement drawing of the grouting holes;

[0068] S32, use obvious markers (painting, wooden stakes or flags) to mark the center point of the grouting hole at each position;

[0069] S33, secondary measurement is made by measuring instrument (total station, GPS receiver or level) to ensure the accuracy and reliability of hole marking; if position error is found, mark position is adjusted in time and confirmed again;

[0070] The hole cleaning process is as follows: mud and loose material in the hole are removed by using high-pressure water gun or air compressor during drilling, and the depth of the hole is confirmed by using depth gauge and pencil mark after hole cleaning is completed. By removing mud and loose material in the hole, the smoothness and cleanliness of the grouting hole are ensured. For the use of high-pressure water gun, the water pressure should be reasonably adjusted according to the depth of the hole, the hole diameter and the nature of the soil, and the water pressure range is generally between 1-5 MPa, to ensure that the mud in the hole can be effectively dispersed and removed. The air compressor blows the loose material out of the hole by injecting high-speed airflow into the hole. After hole cleaning is completed, the depth of the hole is confirmed by using depth gauge and pencil mark. The depth gauge should have high accuracy to accurately measure the depth of the hole, with an error of less than ±1 cm, which helps the smooth injection of grouting material and improves the effect and quality of grouting. At the same time, confirming the depth of the hole can ensure that the depth of the grouting hole meets the design requirements, avoiding the influence of insufficient or excessive hole depth on grouting effect;

[0071] S4, grouting construction: preparing grouting material and performing performance test and confirmation, injecting the prepared grouting material into the grouting hole through the grouting pump, and ensuring that the performance of the grouting material meets the construction requirements through reasonable proportioning and performance test. Good grouting material can improve the effect and durability of grouting and ensure the stability and reliability of ground uplift;

[0072] The preparation of grouting material and performance test and confirmation include the following steps:

[0073] S41, the raw materials of grouting material are fully stirred and mixed by using mechanical stirring tool to form uniform slurry;

[0074] S42, a sample of the slurry is taken for performance test to test the initial reaction time, foaming and curing time and expansion characteristics of the grouting material. The foaming and curing time refers to the time for the slurry to start foaming and gradually solidify to form a structure with certain strength. Through monitoring of the foaming and curing time, the interval and sequence of grouting can be reasonably arranged;

[0075] S43, the results of various performance tests are recorded to confirm whether the grouting material is qualified. If all test results are within the specified index range, the grouting material is considered qualified and the next construction can be carried out. If any index does not meet the requirements, the proportioning of the grouting material needs to be adjusted, and stirring and testing are performed again until the grouting material is qualified;

[0076] S44, after the grouting material is qualified, the grouting operation is carried out by injecting the grouting material into the grouting machine.

[0077] Among them, during the grouting construction, when the grouting pressure suddenly rises or overflows, stop grouting immediately, continue grouting after the slurry solidifies into a solid and closes the grouting gap, when the grouting pressure suddenly drops, increase the slurry concentration or use intermittent grouting method, adjust the grouting parameters in time according to the change of grouting pressure, ensure the safety and effect of grouting construction. When the pressure suddenly rises or overflows, stop grouting, which can avoid soil damage and slurry waste; When the pressure suddenly drops, take corresponding measures, which can ensure the continuity and stability of grouting;

[0078] S5, formation uplift monitoring: install monitoring equipment in the ground subsidence area and the surrounding area, real-time collect data in grouting construction, intelligently analyze the formation uplift situation and grouting effect, through analyzing the change trend of monitoring data, adjust the grouting parameters and construction scheme in time, ensure the effect and safety of formation uplift;

[0079] Among them, the formation uplift monitoring includes the following steps:

[0080] S51, accurately measure the ground subsidence and uplift using the settlement observation instrument, install strain gauges in the section bearing load to real-time monitor the stress state of soil, through monitoring the change of ground subsidence and soil stress state, find problems in time and take measures;

[0081] S52, use electronic level or total station instrument with data acquisition system to realize real-time automatic recording of data;

[0082] S53, use K-means clustering analysis algorithm to identify the subsidence characteristics under different conditions, according to the geographical features, geological conditions, building distribution and other factors of the subsidence area, divide the whole area into several sub-areas, through K-means clustering analysis (existing technology), cluster the data points with similar subsidence characteristics together, identify the subsidence characteristics under different conditions, provide basis for targeted construction adjustment;

[0083] S54, analyze the change trend of monitoring data, identify the dynamic change of formation, and predict the future subsidence / uplift trend, perform time series analysis on long-term accumulated monitoring data, use mathematical model to fit the change trend of data, through observing the slope, curvature and other characteristics of data, identify the dynamic change of formation, such as the change of uplift speed, whether the subsidence has rebound trend, etc., at the same time, based on the existing data and analysis model, predict the subsidence / uplift trend in the future period, provide forward-looking guidance for construction decision;

[0084] S55, generate monitoring report and feedback, according to the monitoring result, adjust the grouting construction scheme;

[0085] S6. Post-construction processing: After the grouting construction is completed, clean up the construction site and conduct quality inspection on the grouting effect;

[0086] The quality inspection process for grouting results is as follows: First, surveying equipment is used to re-measure the elevation of the ground subsidence area and compare it with the pre-construction measurement data to check whether the ground has reached the expected elevation and whether the elevation is uniform. Simultaneously, drilling and coring inspections are conducted, and core samples are drilled from the grouting formation to observe the diffusion and filling of the grout in the soil and to check for unfilled pores or voids.

[0087] This method conducts on-site geological surveys of the ground subsidence area. Detailed geological surveys and calculations of grouting volume and pressure allow targeted grouting to effectively lift the ground and resolve ground subsidence issues. By removing mud and loose materials from the borehole, the grouting holes are kept clear and clean. This facilitates the smooth injection of grouting materials and improves the effectiveness and quality of grouting. Confirming the depth of the hole ensures that it meets design requirements, avoiding grouting effects affected by insufficient or excessive hole depth. During construction, ground uplift and soil stress are monitored in real time, allowing for timely adjustments to the construction plan to ensure safe and reliable construction. Monitoring equipment and the K-means clustering analysis algorithm enable real-time automatic recording and analysis of data, enabling rapid and accurate identification of subsidence characteristics and prediction of future trends, improving construction efficiency and accuracy.

[0088] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A construction process for grouting filling and stratum lifting in a ground subsidence area, characterized in that: The following steps are involved: S1. Geological survey of subsidence areas: Conduct detailed on-site geological surveys of ground subsidence areas to obtain information on stratum structure, rock and soil characteristics, and groundwater levels, and determine the causes of subsidence; S2. Design a grouting plan based on the measurement results, including the selection of grouting materials, calculation of grouting volume and grouting pressure, arrangement of grouting holes, and pre-construction preparations; The calculation of the grouting volume and grouting pressure includes the following steps: S21. Determine the specific height h that needs to be lifted based on the data from the settlement monitoring point; S22. Calculate the grouting volume. The grouting volume calculation formula is: V = M × h; Where V is the required grouting volume, in m 3 , M is the area of ​​grouting range, unit is m 2 , h is the height required to be lifted after grouting (unit: m); S23. Calculate the grouting pressure using the following formula: Where P is the grouting pressure, in pa; F is the applied force, in N, which is calculated by dividing the power of the grouting equipment by the flow velocity of the grouting material. The power unit of the grouting equipment is W, and the flow velocity of the grouting material is m / s; A is the area of ​​the grouting hole, in m 2 ; S3. Grouting hole construction: according to the design plan, use measuring instruments to mark and locate the grouting holes, use a drilling rig to drill and clean the holes; S4, grouting construction: prepare grouting materials and conduct performance testing and confirmation, and inject the prepared grouting materials into the grouting holes through the grouting pump; S5. Ground uplift monitoring: Install monitoring equipment in and around the ground subsidence area to collect real-time data during grouting construction and analyze ground uplift and grouting effects; S6. Post-construction processing: After the grouting construction is completed, clean the construction site and conduct a quality inspection of the grouting effect.

2. A construction process for grouting filling and stratum lifting in a land subsidence area according to claim 1, characterized in that: In step S1, the on-site geological survey includes the following steps: S11. Use surveying and mapping equipment to conduct detailed topographic mapping of the subsidence area and obtain surface elevation change data; S12. Drill holes are laid in the subsidence area to obtain rock and soil samples for field and laboratory testing; S13. Install groundwater level monitoring wells at key locations, regularly measure groundwater level changes, and record historical water level data; S14. Based on the drilling data, draw a geological profile to show the composition, thickness and relationship of the strata at different depths, and conduct soil analysis at various levels.

3. A construction process for grouting filling and stratum lifting in a land subsidence area according to claim 1, characterized in that: In step S3, the marking and positioning of the grouting holes using a measuring instrument includes the following steps: S31. Using a total station, a GPS receiver, or a level, determine the coordinate position of each grouting hole with reference to the layout diagram of the grouting holes; S32. Use a clear mark to mark the center point of the grouting hole at each location; S33. Perform secondary measurement using a total station, GPS receiver, or level to ensure the accuracy and reliability of the hole markings; S34. If position error is found, adjust the mark position in time and confirm again.

4. A construction process for grouting filling and stratum lifting in a land subsidence area according to claim 1, characterized in that: In step S3, the hole cleaning process is as follows: during the drilling process, the mud and loose materials in the hole are removed using a high-pressure water gun or an air compressor. After the hole cleaning is completed, the depth of the hole is confirmed using a depth gauge and a pencil mark.

5. The construction process for grouting filling and stratum lifting in a land subsidence area according to claim 1 is characterized in that: In step S4, the preparation of grouting materials and the performance testing and confirmation include the following steps: S41. Use a mechanical stirring tool to fully stir and mix the raw materials of the grouting material to form a consistent slurry; S42, taking slurry samples for performance testing, testing the initial reaction time, foaming and curing time, and expansion characteristics of the grouting material; S43. Record the results of various performance tests to confirm whether the grouting material is qualified; S44. After passing the test, inject the slurry into the filling machine for grouting operation.

6. A construction process for grouting filling and stratum lifting in a land subsidence area according to claim 1, characterized in that: In step S4, during the grouting construction process, if the grouting pressure suddenly rises or overflows, the grouting is stopped immediately, and the grouting is continued after the slurry solidifies into a solid and the grouting gaps are sealed. When the grouting pressure suddenly drops, the slurry concentration is increased or intermittent grouting is adopted.

7. The construction process for grouting filling and stratum lifting in a land subsidence area according to claim 1 is characterized in that: In step S5, the stratum uplift monitoring includes the following steps: S51. Use settlement observation instruments to accurately measure ground settlement and uplift, and install strain gauges in load-bearing sections to monitor the stress state of the soil in real time; S52. Realize real-time automatic recording of data using an electronic level or total station equipped with a data acquisition system; S53. Use K-means cluster analysis to identify settlement characteristics in different regions or under different conditions; S54. Analyze the changing trends of monitoring data, identify the dynamic changes of the strata, and predict future subsidence / uplift trends; S55. Generate a monitoring report and provide feedback, and adjust the grouting construction plan based on the monitoring results.

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