Method for breaking weathered rock in deep foundation pit based on pre-hole of down-the-hole drill

Abstract

The application discloses a weathered rock breaking method in a deep foundation pit based on a down-the-hole drill pre-hole, and relates to the technical field of weathered rock breaking. In order to solve the problem of high-strength rock breaking, the method comprises the following steps: confirming the physical properties and range of high-strength rocks in a construction area; performing preliminary tests outside the field; performing numerical simulation on the environment of the construction area; dividing each sub-region according to the numerical simulation; leveling the site and arranging the construction operation surface; arranging drill holes in each region; constructing holes by using a down-the-hole drill, and dynamically adjusting the scheme according to the simulation data; breaking rocks by using a hydraulic breaking hammer; and monitoring and analyzing the foundation pit during the period. Through the acquisition of the early construction data, the late simulation arrangement and the selection of mechanical equipment are promoted, and the data need to be provided by a professional geological survey unit. The exploration hole arrangement in the high-strength rock region should be appropriately densified.

Description

Technical Field

[0001] This invention relates to the field of weathered rock removal technology, and in particular to a method for removing weathered rock in deep foundation pits based on pre-drilled holes using down-the-hole drilling. Background Technology

[0002] For the breaking and excavation of high-strength rock, the mainstream technologies currently include blasting, static blasting, and hydraulic breaker chisel techniques. Blasting offers fast construction speed, wide operating range, and rapid results. However, it requires open operating space and cannot be used in densely built-up areas, otherwise it can easily trigger a series of reactions. It is suitable for operations in open environments such as mines and tunnels. Static blasting offers high directional accuracy, low noise, and no dust pollution, but its disadvantages include long drilling time, low production efficiency, high requirements for open face space, and greater susceptibility to environmental factors.

[0003] However, most existing construction sites are located in bustling urban areas, with high-strength rocks in the foundations and significant environmental disturbances in the surrounding building foundations. This leads to higher requirements for breaking high-strength or ultra-high-strength rocks. Therefore, there is an urgent need for a method for breaking weathered rocks in deep foundation pits based on pre-drilled holes using down-the-hole drilling. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a method for removing weathered rocks in deep foundation pits based on pre-drilled holes using down-the-hole drilling.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A method for removing weathered rock in deep foundation pits based on pre-drilled holes using down-the-hole drilling, including a rock fracturing implementation plan for the foundation pit, which includes the following steps:

[0007] A1: Confirm the physical properties and extent of high-strength rock in the construction area;

[0008] A2: Preliminary off-site test;

[0009] A3: Numerical simulation of the construction area environment;

[0010] A3: Divide the sub-regions according to the numerical simulation;

[0011] A4: Site leveling and preparation of the construction work surface;

[0012] A5: Drill hole layout for each area;

[0013] A6: Drilling holes with down-the-hole rigs, and dynamically adjusting the plan by checking the simulation data;

[0014] A7: Used in conjunction with a hydraulic breaker for rock crushing;

[0015] A8: Monitoring technology and analysis of foundation pits during the period.

[0016] Preferably, the physical properties and extent of high-strength rocks in the construction area are confirmed. A professional geological survey unit uses GIS to divide the geological area of ​​the target area and uses exploration equipment to analyze the physical properties of the rocks in the target area, obtaining data such as rock density, elastic wave propagation velocity, magnetic susceptibility, resistivity, thermal conductivity and radioactivity.

[0017] Further: preliminary field tests were conducted using rocks of the same strength, based on rock data provided by the geological unit, to confirm the selection of mechanical equipment and power consumption comparisons, and to choose the best option.

[0018] Based on the aforementioned scheme: numerical simulation of the construction area environment was carried out. A geological structure model was established using StrucKit based on various data provided by the professional survey unit. The FRY method was used to determine the mesh to simulate the real geological conditions of the construction area. The StrucKit model was then imported into ANSYS for finite element analysis.

[0019] A better approach than the aforementioned scheme is to divide each sub-region based on numerical simulation, divide the rock regions of equal strength based on the geological model of StrucKit, determine the construction flow section and the mechanical configuration of each section, set the borehole layout through ANSYS, especially to perform special point treatment on the edge of the deep foundation pit, analyze the range and magnitude of disturbance to the surrounding geological environment caused by the operation of construction machinery, and obtain a reasonable borehole layout under the condition of ensuring support safety.

[0020] As a further aspect of the present invention: site leveling and construction work surface preparation, and conducting on-site in-situ experiments before large-scale construction in the target area.

[0021] Meanwhile, the rock removal area in the target region is a 3m x 3m zone.

[0022] As a preferred embodiment of the present invention: the drilling point layout in each area involves exporting the preliminary points from the ANSYS model to the PTK handpiece for on-site layout, while differentiating each pair of equal elevation areas and rationally planning the drilling depth.

[0023] Meanwhile, the down-the-hole drilling rig constructs the hole, and the simulation data is checked to make dynamic adjustments to the plan. During on-site construction, the responsible personnel need to update the data in real time, adjust the model and data for rock strata areas that exceed the initial data prediction, and update the actual construction layout.

[0024] As a preferred embodiment of the present invention: a hydraulic breaker is used to break the rock, the hydraulic breaker is used to break the rock strata in the borehole, and the model of the hydraulic breaker is adjusted near the support pile. During this period, the foundation pit monitoring technology and analysis are carried out to measure the dynamic settlement values ​​caused by each process in the construction, and the obtained values ​​are compared with the standard values ​​to provide timely feedback to guide the design and construction.

[0025] The beneficial effects of this invention are as follows:

[0026] 1. This method for removing weathered rocks in deep foundation pits based on pre-drilled down-the-hole drilling effectively facilitates the later simulation layout and selection of mechanical equipment by acquiring the early construction data. This data needs to be provided by a professional geological survey unit. In areas with high-strength rock, the layout of the exploration holes should be appropriately densified to ensure that the overall geological conditions of the area can be reflected.

[0027] 2. This method for removing weathered rocks in deep foundation pits based on pre-drilled down-the-hole drilling ensures the efficiency and quality of subsequent mechanical drilling by establishing the physical properties of the rocks in the early stage and conducting field tests on the same rocks. It also ensures the accuracy and researchability of the subsequent drilling data.

[0028] 3. This method for removing weathered rocks in deep foundation pits based on pre-drilled down-the-hole drilling can visualize the three-dimensional geological distribution and changes of the reservoir through a gridded geological structure model. It can also generate two-dimensional images such as structural maps, isopyrographs, and lithofacies distribution maps. Furthermore, it provides a set of organically integrated data, ensuring the contrast of the actual data obtained later and ensuring the consistent processing quality of various rock layer data.

[0029] 4. This method for removing weathered rock in deep foundation pits based on pre-drilled down-the-hole drilling divides rock strata of varying strengths using a geological model and rationally arranges relevant mechanical equipment, effectively promoting the rational optimization and allocation of resources. Simultaneously, it facilitates the early prediction of potential disturbances in the geological environment within sub-regions, ensuring the safety of actual construction. Furthermore, the analysis of the geological model enhances the visualization of borehole location layout, improving the efficiency of subsequent drilling.

[0030] 5. This method for removing weathered rocks in deep foundation pits based on pre-drilled holes facilitates the verification of the effectiveness of rock removal using down-the-hole drilling combined with hydraulic breakers in various areas, effectively confirms the differences between model data and actual conditions, and allows for flexible adjustments to subsequent construction plans.

[0031] 6. This method for removing weathered rock in deep foundation pits based on pre-drilled down-the-hole drilling, through point analysis established by the ANSYS model and exported to the PTK handpiece for on-site layout, effectively improves the accuracy of the drilling point layout, reduces the time for subsequent additional adjustments to the drilling points, and improves the efficiency of mechanical drilling.

[0032] 7. This method for removing weathered rocks in deep foundation pits based on pre-drilled down-the-hole drilling effectively promotes the comparison between actual construction data and model data, and allows for rapid response to construction plans based on the comparison differences. This avoids the problem of construction being halted due to sudden situations. At the same time, it promotes the effectiveness of data updates when facing actual construction conditions and improves the stability of drilling work in rock strata.

[0033] 8. This method for breaking weathered rocks in deep foundation pits based on pre-drilled holes using down-the-hole drilling, by supplementing it with a hydraulic breaker, effectively improves the efficiency of rock breaking and hole formation, accelerates the regional rock breaking construction work, and at the same time, can effectively adjust the hydraulic breaker model in real time according to the different physical properties of the rock strata, ensuring that the disturbance to the soil and rock strata is minimized. Attached Figure Description

[0034] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application. In the drawings:

[0035] Figure 1 This is a schematic diagram illustrating the implementation process of the method for removing weathered rock in deep foundation pits based on pre-drilled holes using down-the-hole drilling proposed in this invention. Detailed Implementation

[0036] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0037] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0038] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0039] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0040] In addition, the term "multiple" should mean two or more.

[0041] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] Example 1:

[0043] Methods for removing weathered rock in deep foundation pits based on pre-drilled holes using down-the-hole drilling, such as Figure 1 As shown, it includes the following steps:

[0044] A1: Confirm the physical properties and extent of high-strength rock in the construction area;

[0045] A2: Preliminary off-site test;

[0046] A3: Numerical simulation of the construction area environment;

[0047] A3: Divide the sub-regions according to the numerical simulation;

[0048] A4: Site leveling and preparation of the construction work surface;

[0049] A5: Drill hole layout for each area;

[0050] A6: Drilling holes with down-the-hole rigs, and dynamically adjusting the plan by checking the simulation data;

[0051] A7: Used in conjunction with a hydraulic breaker for rock crushing;

[0052] A8: Monitoring technology and analysis of foundation pits during the period.

[0053] In order to determine the geological conditions of the target area, the professional geological survey unit used GIS to divide the geological area of ​​the target area and analyzed the physical properties of the geological rocks in the target area using exploration equipment to obtain data such as rock density, elastic wave propagation velocity, magnetic susceptibility, resistivity, thermal conductivity and radioactivity.

[0054] The acquisition of preliminary construction data effectively facilitated the subsequent simulation layout and selection of mechanical equipment. This data needs to be provided by a professional geological survey unit. In particular, the layout of exploration holes in high-strength rock areas should be appropriately increased to ensure that the overall geological conditions of the area can be reflected.

[0055] To ensure the accuracy of subsequent drilling data, the preliminary field test was conducted using rocks of the same strength, based on rock data provided by the geological unit. This confirmed the selection of subsequent mechanical equipment and compared power consumption, allowing for the selection of the optimal option. By establishing the physical properties of the rocks in the preliminary test and conducting field tests on the same rocks, the efficiency and quality of subsequent mechanical equipment drilling were ensured, as well as the accuracy and researchability of the subsequent drilling data.

[0056] To establish a data model, numerical simulation of the construction area environment was performed. A geological structure model was built using StrucKit based on data provided by a professional surveying unit, and the FRY method was used for mesh determination to simulate the actual geological conditions of the construction area. The StrucKit model was then imported into ANSYS for finite element analysis. Through the meshed geological structure model, the three-dimensional geological distribution and variations of the reservoir can be observed, and two-dimensional images such as structural maps, isopyre maps, and lithofacies distribution maps can be created. Furthermore, a set of organically integrated data volumes was provided, ensuring the contrast with the actual data obtained later and guaranteeing the consistent processing quality of various rock layer data.

[0057] To facilitate visualization of borehole location layout in the later stages, the process involves dividing the area into sub-regions based on numerical simulation, classifying rock regions of equal strength according to the StrucKit geological model, determining the construction flow sections and the mechanical configuration of each section, and setting the borehole layout using ANSYS. Special attention is paid to the locations at the edges of deep foundation pits. The scope and magnitude of disturbances to the surrounding geological environment caused by the operation of construction machinery are analyzed to determine a reasonable borehole layout that ensures support safety. The geological model divides the rock strata of various strengths and rationally arranges relevant mechanical equipment, effectively promoting the rational optimization and allocation of resources. Simultaneously, it facilitates the early prediction of potential disturbances in the geological environment within sub-regions, ensuring the safety of actual construction. Furthermore, the analysis of the geological model enhances the visualization of borehole location layout and improves the efficiency of subsequent drilling.

[0058] In order to carry out site leveling and construction work surface preparation, before large-scale construction in the target area, an in-situ test was conducted to determine the rock breaking area as a 3m×3m range. This facilitated the verification of the rock breaking effect of downhole drilling combined with hydraulic breakers in each area, effectively verified the difference between model data and actual conditions, and made it easier to flexibly adjust the subsequent construction plan.

[0059] To determine the appropriate layout of drill points in each area, the preliminary point locations in the ANSYS model were exported to the PTK handheld device for on-site layout. Simultaneously, differentiating between different elevation zones and rationally planning the drilling depth, the point location analysis established through the ANSYS model and its export to the PTK handheld device for on-site layout effectively improved the accuracy of the drill point layout, reduced the time required for subsequent drill point adjustments, and increased the efficiency of mechanical drilling.

[0060] To ensure the consistency between the data and model data during construction, the down-the-hole drilling rig is used to construct the borehole, and the simulation data is checked to dynamically adjust the plan. During on-site construction, the responsible personnel need to update the data in real time, adjust the model and data for rock strata areas that exceed the initial data prediction, and update the actual construction layout. This effectively promotes the comparison between the actual construction data and the model data, and allows for rapid response to the construction plan based on the comparison difference, avoiding the problem of construction being halted due to sudden situations. At the same time, it promotes the effectiveness of data updates when facing actual construction conditions, and improves the stability of drilling work in rock strata areas.

[0061] To meet the requirements of rock strata crushing of varying strengths, a hydraulic breaker is used to crush the rock. The hydraulic breaker is used to crush the rock strata for drilling, and the model of the hydraulic breaker is adjusted near the support piles. By using a hydraulic breaker, the efficiency of rock strata crushing and drilling is effectively improved, and the regional rock strata crushing construction work is accelerated. At the same time, the model of the hydraulic breaker can be effectively adjusted in real time according to the different physical properties of the rock strata, ensuring that the disturbance to the soil and rock strata is minimized.

[0062] To promote the monitoring and analysis of foundation pits during construction; the monitoring and analysis of foundation pits during construction involves measuring the dynamic settlement values ​​caused by each process during construction, comparing the obtained values ​​with the standard values, and providing timely feedback to guide design and construction.

[0063] In this embodiment, the area for rock breaking is determined, and the physical properties and extent of the rock in the target area are analyzed using exploration equipment to obtain relevant data. Based on the relevant data, preliminary off-site tests are conducted, and mechanical equipment is selected based on the test results. Next, numerical simulation modeling of the construction area environment is performed, and sub-regions are divided and borehole points are arranged in the geological model. Subsequently, ground leveling and construction work surface preparation are carried out in the target area, and the actual arrangement of boreholes in each area is determined. At the same time, down-the-hole drilling rigs are used to complete the drilling work, and the scheme is dynamically adjusted based on the simulation data. Hydraulic breakers are used to break the rock, and the hydraulic breakers are adjusted in model near the support piles. Finally, the foundation pit monitoring technology is used to analyze and measure the dynamic settlement values ​​caused by each process during construction. The obtained values ​​are compared with the standard values, and timely feedback is provided to guide the design and construction. After the construction is completed, the excavated soil is transported away and the site is cleaned up.

[0064] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for removing weathered rock in deep foundation pits based on pre-drilled holes using down-the-hole drilling, including an implementation scheme for rock breaking in the foundation pit, characterized in that... The proposed solution for rock breaking in the foundation pit includes the following steps: A1: Confirm the physical properties and extent of high-strength rock in the construction area; A2: Preliminary off-site test; A3: Numerical simulation of the construction area environment; A4: Divide the sub-regions according to the numerical simulation; A5: Site leveling and preparation of the construction work surface; A6: Drill hole layout for each area; A7: Drilling holes with down-the-hole rigs, and dynamically adjusting the plan by checking the simulation data; A8: Used in conjunction with a hydraulic breaker for rock crushing; A9: Monitoring technology and analysis of foundation pits during the construction period; The preliminary off-site test, based on rock data provided by the geological unit, uses rocks of the same strength for off-site testing to confirm the selection of subsequent mechanical equipment and power consumption comparison, selecting the optimal option. The process involves dividing each sub-region based on numerical simulation, dividing areas of equal-strength rock according to the StrucKit geological model, determining the construction flow section and the mechanical configuration for each section, setting up boreholes using ANSYS, processing points at the edge of the deep foundation pit, analyzing the range and magnitude of disturbance to the surrounding geological environment caused by the construction machinery during operation, and determining a reasonable borehole layout to ensure support safety. The preliminary point locations in the ANSYS model are then exported to PTK. The site layout is carried out, and the elevation zones are differentiated to rationally plan the drilling depth. The down-the-hole drill is used to construct the hole, and the simulation data is checked to dynamically adjust the plan. During on-site construction, the responsible personnel need to update the data in real time, simulate and adjust the data for rock strata areas that exceed the initial data prediction, and update the actual construction layout. The hydraulic breaker is used to break the rock. The hydraulic breaker is used to break the rock strata in the hole, and the model of the hydraulic breaker is adjusted near the support pile. During the foundation pit monitoring and analysis, the dynamic settlement value caused by each process in construction is measured, and the obtained value is compared with the standard value to provide timely feedback to guide the design and construction.

2. The method for removing weathered rock in deep foundation pits based on pre-drilled holes using down-the-hole drilling as described in claim 1, characterized in that, The physical properties and extent of the high-strength rocks in the construction area were confirmed. Professional geological survey units used GIS to divide the geological area of ​​the target area and analyzed the physical properties of the rocks in the target area using exploration equipment to obtain data on rock density, elastic wave propagation velocity, magnetic susceptibility, resistivity, thermal conductivity, and radioactivity.

3. The method for removing weathered rock in deep foundation pits based on pre-drilled holes using down-the-hole drilling as described in claim 1, characterized in that, The construction area environment was numerically simulated. Based on the data provided by the professional survey unit, a geological structure model was established using StrucKit, and the FRY method was used to determine the mesh to simulate the real geological conditions of the construction area. The StrucKit model was then imported into ANSYS for finite element analysis.

4. The method for removing weathered rock in deep foundation pits based on pre-drilled holes using down-the-hole drilling as described in claim 1, characterized in that, Before large-scale construction in the target area, the site leveling and construction work surface preparation shall be carried out by conducting on-site in-situ tests.

5. The method for removing weathered rock in deep foundation pits based on pre-drilled holes using down-the-hole drilling as described in claim 4, characterized in that, The rock removal area of ​​the target region is a range of 3m × 3m.

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