Ground subsidence area grouting filling and stratum lifting construction technology

Abstract

The invention discloses a ground subsidence area grouting filling and stratum lifting construction technology, and relates to the technical field of subsidence repair, and the technology comprises the following steps: subsidence area geological investigation: carrying out detailed field geological investigation on a ground subsidence area, obtaining a stratum structure, rock and soil characteristics and underground water level conditions, and determining a subsidence reason; and designing a grouting scheme according to a measurement result, and the like. According to the method, by conducting field geological exploration on the land subsidence area and calculating the grouting amount and the grouting pressure, grouting construction can be conducted in a targeted mode, the situation of excessive lifting or insufficient lifting is avoided, and therefore the construction quality and the safety of the surrounding environment are guaranteed, the land subsidence problem is solved, data in grouting construction are collected in real time, and the construction efficiency is improved. The stratum lifting condition and the grouting effect are analyzed, the grouting parameters and the construction scheme can be adjusted in time by analyzing the change trend of monitoring data, and the stratum lifting effect and safety are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of subsidence repair, and in particular to a construction process for grouting filling and stratum lifting in a ground subsidence area. Background Art

[0002] With the continuous acceleration of urbanization, the scale of urban construction has continued to expand. A large number of high-rise buildings, underground projects, rail transit and other infrastructure construction have exerted tremendous pressure on the strata. At the same time, the increase in urban population has also led to excessive exploitation of water resources and a drop in groundwater levels. These factors may cause ground subsidence, which will bring many hazards to the city, such as building tilting, 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 subsidence.

[0003] At present, the existing lifting technology for ground subsidence areas lacks reasonable design of grouting parameters, and lacks real-time monitoring of ground lifting and settlement. It cannot accurately reflect the actual changes in the ground, which affects the construction personnel's judgment on the lifting effect and makes it difficult to adjust the construction parameters in time, which in turn affects the effect of grouting filling and lifting. Summary of the invention

[0004] The purpose of the present invention is to provide a construction process for grouting filling and stratum lifting in a ground subsidence area to solve the problems raised by the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a construction process for grouting filling and stratum lifting in a ground subsidence area, comprising the following steps:

[0006] S1. Geological survey of subsidence area: Conduct detailed on-site geological survey of the ground subsidence area to obtain the stratum structure, rock and soil characteristics, groundwater level, and determine the cause of subsidence;

[0007] S2. Design the grouting scheme according to the measurement results, including the selection of grouting materials, calculation of grouting volume and grouting pressure, arrangement of grouting holes, and pre-construction preparation;

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

[0009] S21, determining the specific height h that needs to be lifted based on the data of the settlement monitoring point;

[0010] S22. Calculate the grouting volume. The grouting volume calculation formula is:

[0011] V = M × h;

[0012] Where V is the required grouting volume, in m 3 , M is the area of ​​grouting range, unit is m2 , h is the height required to be lifted after grouting, in meters;

[0013] S23. Calculate the grouting pressure to ensure sufficient pressure increase to push the slurry into the soil without causing soil damage. The calculation formula is as follows:

[0014]

[0015] 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 of the grouting equipment is in W, and the flow velocity of the grouting material is in m / s; A is the area of ​​the grouting hole, in m 2 ;

[0016] S3. Grouting hole construction: according to the design plan, use measuring instruments to mark and locate the grouting holes, use drilling rigs to drill and clean the holes;

[0017] S4, grouting construction: prepare grouting materials and conduct performance testing and confirmation, and inject the prepared grouting materials into the grouting holes through a grouting pump;

[0018] 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;

[0019] S6. Post-construction processing: After the grouting construction is completed, clean up the construction site and conduct a quality inspection on the grouting effect.

[0020] Furthermore, in step S1, the on-site geological survey includes the following steps:

[0021] S11. Use surveying and mapping equipment to conduct detailed topographic mapping of the subsidence area and obtain surface elevation change data;

[0022] S12. Drill holes are laid in the settlement area to obtain rock and soil samples for field and laboratory testing;

[0023] S13. Set up groundwater level monitoring wells at key locations, regularly measure groundwater level changes, and record historical water level data;

[0024] S14. Draw a geological profile based on the drilling data to show the composition, thickness and relationship of the strata at different depths, and conduct analysis of each layer of soil.

[0025] Further, in step S3, the marking and positioning of the grouting holes using a measuring instrument comprises the following steps:

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

[0027] S32. Use obvious marks to mark the center point of the grouting hole at each location;

[0028] S33. Perform secondary measurement using a total station, GPS receiver or level to ensure the accuracy and reliability of hole position marking;

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

[0030] Furthermore, in step S3, the process of hole cleaning is as follows: during the drilling process, mud and loose materials in the hole are removed by using a high-pressure water gun or an air compressor, and after the hole cleaning is completed, the depth of the hole is confirmed by using a depth gauge and pencil marking.

[0031] Further, in step S4, the preparation of grouting materials and performance testing and confirmation include the following steps:

[0032] S41, using a mechanical stirring tool to fully stir and mix the raw materials of the grouting material to form a consistent slurry;

[0033] S42, taking slurry samples for performance testing, testing the initial reaction time, foaming and curing time, and expansion characteristics of the grouting material;

[0034] S43, record the results of various performance tests and confirm whether the grouting material is qualified;

[0035] S44. After passing the test, inject the slurry into the filling machine for grouting operation.

[0036] Furthermore, in step S4, during the grouting construction process, when 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.

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

[0038] S51. Use settlement observation instruments to accurately measure ground settlement and uplift, and install strain gauges in the load-bearing sections to monitor the stress state of the soil in real time;

[0039] S52. Realize real-time automatic recording of data using an electronic level or total station equipped with a data acquisition system;

[0040] S53, using K-means cluster analysis to identify settlement characteristics in different regions or under different conditions;

[0041] S54. Analyze the changing trends of monitoring data, identify the dynamic changes of the strata, and predict future subsidence / uplift trends;

[0042] S55. Generate monitoring report and provide feedback, and adjust the grouting construction plan based on the monitoring results.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] 1. In this method, through on-site geological survey of the ground subsidence area, detailed geological survey and calculation of grouting volume and grouting pressure, targeted grouting construction can be carried out to effectively lift the stratum and solve the ground subsidence problem. Real-time data collection during grouting construction, analysis of stratum lifting and grouting effect, and analysis of the changing trend of monitoring data can timely adjust grouting parameters and construction plans to ensure the effect and safety of stratum lifting.

[0045] 2. In this method, by determining the specific height that needs to be lifted, a basis is provided for the calculation of the grouting volume. Reasonable calculation of the grouting volume and grouting pressure can ensure that the stratum lifting effect meets the design requirements, avoid excessive or insufficient lifting, improve the efficiency and effect of grouting construction, and ensure the stability and uniformity of stratum lifting.

[0046] 3. In this method, the grouting parameters are adjusted in time according to the changes in the grouting pressure to ensure the safety and effect of the grouting construction. When the pressure suddenly rises or overflows, the grouting is stopped to avoid soil damage and slurry waste. When the pressure suddenly drops, corresponding measures are taken to ensure the continuity and stability of the grouting. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 The present invention is a flow chart of a construction process for grouting filling and stratum lifting in a ground subsidence area. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] See also Figure 1 , a construction process for grouting filling and ground lifting in a ground subsidence area, comprising the following steps:

[0050] S1. Geological survey of subsidence area: Conduct detailed on-site geological survey of the ground subsidence area to obtain the stratum structure, rock and soil characteristics, groundwater level, and determine the cause of subsidence;

[0051] Among them, the on-site geological survey includes the following steps:

[0052] S11. Use surveying and mapping equipment to conduct detailed topographic mapping of the settlement area and obtain surface elevation change data. The surveying and mapping scope should cover the entire settlement area and a certain buffer zone around it 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, the surface elevation change of each measuring point can be accurately obtained, which provides an intuitive basis for determining the scope and degree of ground settlement, helps to understand the overall terrain conditions of the settlement area, and provides basic terrain information for the design of subsequent construction plans;

[0053] S12. Drill holes are laid in the settlement area, and rock and soil samples are obtained through drilling. On-site and laboratory tests are carried out. By obtaining rock and soil samples for testing, we can gain an in-depth understanding of the structure of the strata and the physical and mechanical properties of the rock and soil; the depth of the borehole should be determined based on the preliminary estimate of the settlement depth and the empirical data under similar geological conditions in the surrounding area to ensure that all strata that may be involved can be penetrated. Some samples are properly packaged and sent to professional laboratories for more in-depth physical and mechanical property tests, including but not limited to the density, porosity, compressive strength, shear strength, etc. of the rock and soil. Through these tests, we can gain an in-depth understanding of the structure of the strata and the physical and mechanical properties of the rock and soil, providing a 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 to regularly measure groundwater level changes and record historical water level data; these key locations include possible groundwater recharge areas, runoff areas, and discharge areas, as well as areas with severe subsidence. The depth of the monitoring wells should penetrate the aquifer to ensure that groundwater level changes can be accurately measured.

[0055] S14. Draw geological profiles based on drilling data to display the composition, thickness and mutual relationship of strata at different depths, and conduct soil layer analysis. In the profiles, clearly display the composition of strata at different depths, such as the distribution of sand layers, soil layers, rock layers, 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 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 preparation; reasonable calculation of grouting volume and grouting pressure can ensure that the ground lifting effect meets the design requirements, effectively avoid excessive or insufficient lifting, and thus ensure the construction quality and the safety of the surrounding environment;

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

[0058] S21, determining the specific height h that needs to be lifted based on the data of the settlement monitoring point;

[0059] S22. Calculate the grouting volume. The grouting volume calculation formula is:

[0060] V = M × h;

[0061] 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, in meters;

[0062] S23. Calculate the grouting pressure to ensure sufficient pressure increase to push the slurry into the soil without causing soil damage. The calculation formula is as follows:

[0063]

[0064] 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 of the grouting equipment is in W, and the flow velocity of the grouting material is in m / s; A is the area of ​​the grouting hole, in m 2 .

[0065] S3. Grouting hole construction: According to the design plan, use measuring instruments to mark and locate the grouting holes, use drilling rigs to drill and clean the holes, and ensure that the layout of the grouting holes meets the design requirements. This can improve the accuracy and effect of grouting and avoid problems such as uneven grouting or leakage caused by hole position deviation;

[0066] The process of marking and locating the grouting holes using a measuring instrument is as follows:

[0067] S31. Use high-precision measuring equipment to determine the coordinate position of each grouting hole with reference to the layout diagram of the grouting holes;

[0068] S32. Use a visible marker (spray paint, stakes, or flags) to mark the center point of the grouting hole at each location;

[0069] S33. Perform secondary measurement using a measuring instrument (total station, GPS receiver or level) to ensure the accuracy and reliability of the hole position marking; if position error is found, adjust the marking position in time and confirm again;

[0070] Among them, the process of hole cleaning is as follows: during the drilling process, use a high-pressure water gun or air compressor to remove the mud and loose materials in the hole. After the hole cleaning is completed, use a depth gauge and pencil marking to confirm the depth of the hole. By removing the mud and loose materials in the borehole, the grouting hole is guaranteed to be unobstructed and clean. For the use of high-pressure water guns, the water pressure should be reasonably adjusted according to the depth of the borehole, the hole diameter and the nature of the soil. The general water pressure range is between 1-5MPa to ensure that the mud in the hole can be effectively dispersed and removed. The air compressor blows the loose materials out of the hole by spraying high-speed airflow into the hole. After the hole cleaning is completed, use a depth gauge and pencil marking to confirm the depth of the hole. The depth gauge should have high precision and be able to accurately measure the depth of the borehole with an error control within ±1cm, which is conducive to the smooth injection of grouting materials 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 and avoid affecting the grouting effect due to insufficient or excessive hole depth;

[0071] S4, grouting construction: prepare grouting materials and conduct performance tests and confirmation. Use a grouting pump to inject the prepared grouting materials into the grouting holes. Through reasonable proportions and performance tests, ensure that the performance of the grouting materials meets the construction requirements. Good grouting materials can improve the effect and durability of grouting and ensure the stability and reliability of stratum lifting;

[0072] Wherein, the preparation of grouting materials and performance testing and confirmation include the following steps:

[0073] S41, using a mechanical stirring tool to fully stir and mix the raw materials of the grouting material to form a consistent slurry;

[0074] S42, taking slurry samples for performance testing, testing the initial reaction time, foaming and curing time and expansion characteristics of the grouting material. The foaming and curing time refers to the time when the slurry starts to foam and gradually solidifies to form a structure with a certain strength. By monitoring the foaming and curing time, the interval and sequence of grouting can be reasonably arranged;

[0075] S43, record the results of various performance tests to confirm whether the grouting material is qualified. If the 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, it is necessary to readjust the proportion of the grouting material, re-mix and re-test until it is qualified;

[0076] S44, after passing the test, inject the slurry into the filling machine for grouting operation;

[0077] In the grouting construction process, when the grouting pressure suddenly rises or overflows, stop grouting immediately, wait for the slurry to solidify into a solid, and continue grouting after the grouting gaps are sealed. When the grouting pressure suddenly drops, increase the slurry concentration or use intermittent grouting. Adjust the grouting parameters in time according to the changes in grouting pressure to ensure the safety and effect of grouting construction. Stop grouting when the pressure suddenly rises or overflows to avoid soil damage and slurry waste; take corresponding measures when the pressure suddenly drops to ensure the continuity and stability of grouting;

[0078] S5. Ground uplift monitoring: Install monitoring equipment in and around the ground subsidence area to collect data during grouting construction in real time, and intelligently analyze the ground uplift situation and grouting effect. By analyzing the changing trend of monitoring data, the grouting parameters and construction plan can be adjusted in time to ensure the effect and safety of ground uplift;

[0079] Wherein, the stratum uplift monitoring comprises the following steps:

[0080] S51. Use settlement observation instruments to accurately measure ground settlement and uplift. Install strain gauges in load-bearing sections to monitor the stress state of the soil in real time. By monitoring changes in ground settlement and soil stress state, problems can be discovered in a timely manner and measures can be taken.

[0081] S52. Realize real-time automatic recording of data using an electronic level or total station equipped with a data acquisition system;

[0082] S53, using the K-means cluster analysis algorithm to identify settlement characteristics in different regions or under different conditions, dividing the entire region into several sub-regions according to factors such as geographical characteristics, geological conditions, and building distribution in the settlement region, clustering data points with similar settlement characteristics together through K-means cluster analysis (existing technology), identifying settlement characteristics in different regions or under different conditions, and providing a basis for targeted construction adjustments;

[0083] S54. Analyze the changing trend of monitoring data, identify the dynamic changes of the strata, and predict the future settlement / uplift trend. Perform time series analysis on the long-term accumulated monitoring data, use mathematical models to fit the changing trend of the data, and identify the dynamic changes of the strata by observing the slope, curvature and other characteristics of the data, such as the change in the uplift speed, whether the settlement has a rebound trend, etc. At the same time, based on the existing data and analysis models, predict the settlement / uplift trend in the future to provide forward-looking guidance for construction decisions;

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

[0085] S6. Post-construction processing: After the grouting construction is completed, the construction site is cleaned and the quality inspection of the grouting effect is carried out;

[0086] The process of quality inspection of grouting effect is as follows: First, use surveying equipment to measure the elevation of the ground settlement area again, compare it with the measurement data before construction, and check whether the ground has reached the expected lifting height and whether the lifting is uniform. At the same time, conduct drilling and coring inspection, drill core samples from the stratum after grouting, observe the diffusion and filling of the slurry in the soil, and check whether there are unfilled pores or voids.

[0087] In this method, through on-site geological survey of the ground subsidence area, detailed geological survey and calculation of grouting volume and grouting pressure, grouting construction can be carried out in a targeted manner, the ground can be effectively lifted, and the ground subsidence problem can be solved; by removing the mud and loose materials in the borehole, the grouting hole can be kept unobstructed and clean. This helps to smoothly inject the grouting material and improve 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 and avoids affecting the grouting effect due to insufficient or excessive hole depth. During the construction process, the ground lifting situation and soil stress state are monitored in real time, and the construction plan is adjusted in time to ensure safe and reliable construction. The monitoring equipment and K-means clustering analysis algorithm are used to realize real-time automatic recording and analysis of data, which can quickly and accurately identify settlement characteristics and predict future trends, and improve 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 protection scope of the present invention.

Claims

1. A construction process for grouting filling and ground lifting in a ground subsidence area, characterized in that: The following steps are involved: S1. Geological survey of subsidence area: Conduct detailed on-site geological survey of the ground subsidence area to obtain the stratum structure, rock and soil characteristics, groundwater level, and determine the cause of subsidence; S2. Design the grouting scheme according to the measurement results, including the selection of grouting materials, calculation of grouting volume and grouting pressure, arrangement of grouting holes, and pre-construction preparation; The calculation of the grouting volume and grouting pressure comprises the following steps: S21, determining the specific height h that needs to be lifted based on the data of 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, in meters; 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 of the grouting equipment is in W, and the flow velocity of the grouting material is in 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 drilling rigs 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 a 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 up the construction site and conduct a quality inspection on the grouting effect.

2. A construction process for grouting filling and ground lifting in a ground 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 settlement area to obtain rock and soil samples for field and laboratory testing; S13. Set up groundwater level monitoring wells at key locations, regularly measure groundwater level changes, and record historical water level data; S14. Draw a geological profile based on the drilling data to show the composition, thickness and relationship of the strata at different depths, and conduct analysis of each layer of soil.

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 comprises the following steps: S31, using a total station, a GPS receiver or a level, with reference to the layout diagram of the grouting holes, determine the coordinate position of each grouting hole; S32. Use obvious marks 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 hole position marking; 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 process of hole cleaning is as follows: during the drilling process, the mud and loose materials in the hole are removed by using a high-pressure water gun or an air compressor. After the hole cleaning is completed, the depth of the hole is confirmed by using a depth gauge and pencil marking.

5. The construction process for grouting filling and ground lifting in a ground subsidence area according to claim 1 is characterized in that: In step S4, the preparation of grouting materials and performance testing and confirmation include the following steps: S41, using 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 and 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, when 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 ground lifting in a land subsidence area according to claim 1 is characterized in that: In step S5, the formation uplift monitoring includes the following steps: S51. Use settlement observation instruments to accurately measure ground settlement and uplift, and install strain gauges in the sections bearing loads 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, using 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 monitoring report and provide feedback, and adjust the grouting construction plan based on the monitoring results.

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