Plateau cretaceous system sandstone weathering degree evaluation method and system
By combining various weathering influencing factors and mechanisms into a method and system for evaluating the weathering degree of Cretaceous sandstone in the plateau, an evaluation index system was established and function fitting was performed. This solved the problem of the lack of quantitative assessment in existing technologies, realized the quantification and quantitative classification of weathering degree, reduced subjective influence, and provided a quantitative basis for construction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-26
- Publication Date
- 2026-03-10
AI Technical Summary
Existing technologies lack quantitative evaluation parameters and a unified assessment system for the weathering degree of Cretaceous sandstone in the plateau, resulting in assessment results being greatly affected by subjectivity.
By selecting typical areas and combining various weathering influencing factors and mechanisms, a weathering degree evaluation index system is established. Qualitative classification is carried out from the surface to the ground, and the weathering degree limit value is determined through function fitting analysis. A method and system for evaluating the weathering degree of Cretaceous sandstone in the plateau is established.
It enables a quantitative evaluation of the weathering degree of Cretaceous sandstone in the plateau, reduces subjective interference, provides a quantitative basis for construction and treatment, and saves costs.
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Figure CN121633435A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of rock weathering evaluation, and particularly relates to a plateau Cretaceous sandstone weathering degree evaluation method and system. BACKGROUND
[0002] The Longdong plateau is located in the southwest corner of the Ordos Basin, and Cretaceous strata are widely developed in the region. The original rock has the characteristics of weak cementation, loose structure and low strength, which affects the identification of the weathering degree and causes errors, so it is necessary to establish an evaluation system based on multiple parameters and comprehensive evaluation.
[0003] The prior art has the following defects:
[0004] (1) The evaluation index of the weathering degree in the current specification is qualitatively described from the angles of rock color and strength, and lacks quantitative evaluation parameters.
[0005] (2) There is no unified evaluation system for weakly cemented sandstone in the Longdong plateau, and the assessment of the weathering degree by technical personnel is often affected by subjective cognition. SUMMARY
[0006] The present application provides a plateau Cretaceous sandstone weathering degree evaluation method and system to solve the above technical problems existing in the existing Cretaceous sandstone weathering degree evaluation system.
[0007] According to a first aspect, a plateau Cretaceous sandstone weathering degree evaluation method is provided in an embodiment, and the method comprises:
[0008] Based on the distribution area of the plateau Cretaceous sandstone and the weathering influencing factors, a typical Cretaceous sandstone distribution area is selected as a target research area;
[0009] Combined with the weathering influencing factors and the weathering mechanism in the region, a Cretaceous sandstone weathering degree evaluation index system is established, and the Cretaceous sandstone strata are qualitatively classified from the surface to the ground according to the rock weathering degree;
[0010] The rocks required to be evaluated at different depths in the Cretaceous sandstone strata in the target research area are sampled and collected, and the weathering degree evaluation index values of the rocks required to be evaluated at different depths are detected and obtained;
[0011] The weathering degree evaluation index values of the rocks required to be evaluated at different depths are functionally fitted and analyzed with the depth data to obtain the functional relationship of the weathering degree evaluation index values with the depth;
[0012] Based on the functional relationship of the weathering degree evaluation index values with the depth, the index division limit values of different grades of weathering degree strata are determined, and thus a plateau Cretaceous sandstone weathering degree evaluation system is established.
[0013] Further, based on the distribution area of the plateau Cretaceous sandstone and the influencing factors of weathering, a typical Cretaceous sandstone distribution area is selected as the target research area, which specifically includes:
[0014] Through detailed collection of regional engineering geological and hydrogeological data, combined with regional survey data including previous drilling results, geophysical prospecting results, and survey reports, the distribution area of Cretaceous sandstone and the influencing factors of weathering in the region are analyzed, and a typical sandstone distribution area is selected as the target research area.
[0015] Further, combined with the influencing factors of weathering and the weathering mechanism in the region, an evaluation index system for the weathering degree of Cretaceous sandstone is established, which specifically includes:
[0016] Considering that the main factors affecting weathering include changes in groundwater level and occurrence and migration conditions, groundwater salt concentration, and seasonal temperature changes, the mechanism of rock weathering is the expansion of internal fissures and the loss of fine-grained material.
[0017] Further, combined with the influencing factors of weathering and the weathering mechanism in the region, an evaluation index system for the weathering degree of Cretaceous sandstone is established, which specifically includes:
[0018] The selected weathering degree evaluation index in the macro aspect includes density loss rate and wave velocity loss rate, and the selected weathering degree evaluation index in the micro aspect includes porosity, CT value, and mineral chemical content, wherein the measured index value of the intact rock at the bottom of the deep hole with a hole depth greater than the preset value is selected as the standard reference for unweathered rock.
[0019] Further, an evaluation index system for the weathering degree of Cretaceous sandstone is established, which specifically includes:
[0020] The density loss rate is the ratio of the measured rock density to the unweathered rock density;
[0021] The wave velocity loss rate is the square ratio of the measured rock wave velocity to the unweathered rock wave velocity;
[0022] The porosity uses the porosity value of the rock in a single polarizing microscope as an evaluation index;
[0023] The CT value is obtained by scanning the interior of the rock with a CT scanner;
[0024] The mineral chemical content is detected by XRD means, and CIA is used as an evaluation index for mineral element loss, wherein CIA refers to the mole percentage content of aluminum oxide in the rock, CAC refers to the mole percentage content of calcium oxide in the rock, CNa refers to the mole percentage content of sodium oxide in the rock, The CIA value refers to the molar percentage of potassium oxide in rocks; a higher CIA value indicates more intense weathering.
[0025] Furthermore, the Cretaceous sandstone strata are qualitatively classified from the surface down to the subsurface according to the degree of rock weathering, specifically including:
[0026] From the surface to the ground, the Cretaceous sandstone strata are successively divided into completely weathered, strongly weathered, weakly weathered, slightly weathered, and unweathered.
[0027] Furthermore, based on the functional relationship between the evaluation index values of various weathering degrees and depth, the index classification boundary values for strata with different weathering degrees are determined, thereby establishing an evaluation system for the weathering degree of Cretaceous sandstone in the plateau, specifically including:
[0028] Based on the functional relationship curves of the values of various weathering evaluation indicators with depth, points with obvious gradient changes are selected as the boundary points for classifying weathering levels.
[0029] Furthermore, an evaluation system for the weathering degree of Cretaceous sandstone in the plateau will be established, specifically including:
[0030] For unweathered materials: density loss rate ≤20, wave velocity loss rate ≤35, CT value ≥1350, porosity ≥10%, CIA ≤20;
[0031] For weak weathering: density loss rate ranges from 20 to 40, wave velocity loss rate ranges from 35 to 50, CT value ranges from 1250 to 1270, porosity ranges from 15% to 20%, and CIA ranges from 30 to 40.
[0032] For strong weathering: density loss rate ranges from 40 to 50, wave velocity loss rate ranges from 50 to 65, CT value ranges from 1200 to 1250, porosity ranges from 20% to 25%, and CIA ranges from 40 to 50.
[0033] For fully weathered conditions: density loss rate ≥ 50, wave velocity loss rate ≥ 65, CT value ≤ 1200, porosity ≥ 25%, CIA ≥ 50.
[0034] According to a second aspect, one embodiment provides a system for evaluating the weathering degree of Cretaceous sandstone in the plateau region, the system comprising:
[0035] The typical area determination module is used to select typical Cretaceous sandstone distribution areas as target study areas based on the distribution areas of Cretaceous sandstone in the plateau and the influencing factors of weathering.
[0036] The evaluation index system construction module is used to establish an evaluation index system for the weathering degree of Cretaceous sandstone by combining the influencing factors and weathering mechanisms of weathering in the region, and to qualitatively classify the Cretaceous sandstone strata according to the degree of rock weathering from the surface to the ground.
[0037] The detection module is used to collect samples of the required evaluation rocks at different depths in the Cretaceous sandstone strata within the target study area, and to detect and obtain the evaluation index values of various weathering degree of the required evaluation rocks at different depths.
[0038] The function fitting module is used to perform function fitting analysis on the various weathering degree evaluation index values of the rocks to be evaluated at different depths and the depth data to obtain the functional relationship between the weathering degree evaluation index values and the depth.
[0039] The grading boundary delineation module is used to determine the index delineation boundary values of strata with different weathering degrees based on the functional relationship between the evaluation index values of each weathering degree and the depth, thereby establishing an evaluation system for the weathering degree of Cretaceous sandstone in the plateau.
[0040] According to a third aspect, one embodiment provides an electronic device, the device comprising: a processor and a memory;
[0041] The memory is used to store one or more program instructions;
[0042] The processor is configured to run one or more program instructions to perform the steps of a method for evaluating the weathering degree of Cretaceous sandstone in plateau regions as described in any of the preceding claims.
[0043] According to a fourth aspect, one embodiment provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of a method for evaluating the weathering degree of Cretaceous sandstone in plateau regions as described in any of the preceding claims.
[0044] This application provides a method and system for evaluating the weathering degree of Cretaceous sandstone in the plateau region, which has the following beneficial effects:
[0045] 1. Quantitative identification of rock weathering degree helps to further quantify construction treatment measures in surrounding rocks with different weathering grades during the construction process, thus saving costs.
[0046] 2. The existing assessment system is mainly qualitative, and the judgment results are influenced by subjective perception. Quantifying the degree of weathering can reduce the interference and influence of human factors. Attached Figure Description
[0047] Figure 1 A flowchart illustrating a method for evaluating the weathering degree of Cretaceous sandstone in the plateau region, provided as an embodiment of the present invention;
[0048] Figure 2 This is a flowchart illustrating the specific implementation of a method for evaluating the weathering degree of Cretaceous sandstone in the plateau, as provided in one embodiment of the present invention.
[0049] Figure 3 A density loss rate versus depth curve is provided in a method for evaluating the weathering degree of Cretaceous sandstone in the plateau, as an embodiment of the present invention.
[0050] Figure 4 This invention provides a qualitative classification of rock weathering degree in a method for evaluating the weathering degree of Cretaceous sandstone in the plateau, as an embodiment of the present invention. Detailed Implementation
[0051] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings. Similar elements in different embodiments are referred to by associated similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of this application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to this application are not shown or described in the specification. This is to avoid obscuring the core parts of this application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.
[0052] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.
[0053] The first embodiment of this invention provides a method for evaluating the weathering degree of Cretaceous sandstone in the Longdong Plateau. Addressing the shortcomings of existing evaluation systems for the weathering degree of Cretaceous sandstone in the Longdong Plateau, this invention combines data such as density loss rate, wave velocity loss rate, porosity, CT value, and changes in mineral chemical content to evaluate and analyze the weathering degree of Cretaceous sandstone in the Longdong Plateau, assessing its macroscopic and microscopic influence patterns, thereby achieving a standardized assessment of its weathering degree. The following is a further explanation... Figure 1 and Figure 2 Please provide a detailed explanation.
[0054] like Figure 1 As shown, in step S100, based on the distribution area of Cretaceous sandstone in the plateau and the influencing factors of weathering, a typical Cretaceous sandstone distribution area is selected as the target study area.
[0055] In this embodiment, by collecting detailed engineering geological and hydrogeological data of the study area, and combining the previous drilling results, geophysical results, and exploration reports in the area, the distribution area of Cretaceous sandstone and weathering influencing factors in the region are analyzed, and then a typical sandstone distribution area is selected as the study area.
[0056] like Figure 1 As shown, in step S200, an evaluation index system for the weathering degree of Cretaceous sandstone is established by combining the influencing factors and weathering mechanisms of weathering in the region, and the Cretaceous sandstone strata are qualitatively classified according to the degree of rock weathering from the surface to the ground.
[0057] In this embodiment, considering the main factors affecting weathering in the region, and taking into account that weathering is more intense closer to the surface, the weathering layers from the surface down are classified as completely weathered, strongly weathered, weakly weathered, slightly weathered, and unweathered. Figure 3 As shown.
[0058] Considering that groundwater level changes, occurrence and transport conditions, groundwater salt concentration, and seasonal temperature variations are the main factors influencing weathering, the mechanism of rock weathering is the expansion of internal mineral fissures and the loss of fine-grained material. Therefore, from a macroscopic perspective, density loss rate and wave velocity loss rate are considered. Figure 2 As its quantitative evaluation index, at the micro level, changes in porosity, CT value, and mineral chemical content are used as evaluation characteristics. Figure 2 The intact rock at the bottom of the deep hole (hole depth greater than 100m) was selected as the standard reference for the measured index of the unweathered rock.
[0059] Among these, density loss rate is the ratio of the measured rock density to the density of unweathered rock; wave velocity loss rate is the ratio of the square of the wave velocity of the measured rock to the wave velocity of unweathered rock; porosity is evaluated using the porosity value of the rock under a single-polarization microscope; CT value is obtained by scanning the interior of the rock using a CT scanner; mineral chemical content is detected by XRD, and CIA is used as an evaluation index for mineral element loss. ,in The molar percentage of aluminum oxide in a rock. This refers to the molar percentage of calcium oxide in rocks. This refers to the molar percentage of sodium oxide in a rock. The CIA value refers to the molar percentage of potassium oxide in rocks; a higher CIA value indicates more intense weathering.
[0060] like Figure 1 As shown, in step S300, samples of the required evaluation rocks at different depths in the Cretaceous sandstone strata boreholes within the target study area are collected, and the values of various weathering degree evaluation indicators of the required evaluation rocks at different depths are detected and obtained.
[0061] Specifically, based on the understanding of the monitoring indicators of unweathered rocks, the required indicators such as rock density, wave velocity, porosity, CT value, and mineral chemical content of the surface and borehole samples in the region are then detected and analyzed according to the methods listed in S200.
[0062] like Figure 1 As shown, in step S400, the weathering degree evaluation index values of the rocks to be evaluated at different depths are subjected to function fitting analysis with the depth data to obtain the functional relationship between the weathering degree evaluation index values and the depth.
[0063] Specifically, all the above data will be summarized and analyzed in computer language to determine its functional relationship with burial depth, thereby clarifying the index characteristics at different depths and selecting typical data change points as the basis for weathering layer division. For example, Figure 4 To conduct compaction tests on core samples from different depths using a 300-meter deep borehole, the core density at 0m was used as the baseline for fully weathered rock, and the core density at 300m was used as the baseline for unweathered rock. The density loss rate exhibited different characteristics with depth. Data fitting revealed a significant gradient in density loss rate between 0-20m and 20-60m, with a loss rate of 65% at 20m, which was used as the boundary between fully weathered and strongly weathered rock. The density loss rate between 20-60m ranged from 50% to 65%, with a significant fluctuation in slope compared to the 60-190m range, and a loss rate of 50% at 60m, which was used as the boundary between weakly weathered and strongly weathered rock. The slope was approximately uniform between 190-300m, and since the rock at 300m was unweathered, a density loss rate of 35% at 190m was used as the boundary between unweathered and weakly weathered rock. Furthermore, the values of characteristic indicators such as wave velocity, porosity, CT value, and mineral chemical content were also fitted using the above method, and the areas with obvious changes were used as thresholds for classifying the degree of weathering.
[0064] like Figure 1 As shown, in step S500, based on the functional relationship between the values of each weathering degree evaluation index and depth, the index division boundary values of strata with different weathering degrees are determined, thereby establishing an evaluation system for the weathering degree of Cretaceous sandstone in the plateau.
[0065] Specifically, based on the characteristics of indicators under different depth conditions, an evaluation system for the weathering degree of Cretaceous sandstone in the Longdong Plateau was established (Table 1). This system includes characteristic indicators such as density, wave velocity, porosity, CT value, and mineral chemical content. The weathering degree can be determined if the rock test results meet three of the classification criteria. The model was then further optimized and improved using other data.
[0066] Table 1 Evaluation system for weathering degree of Cretaceous sandstone in the Longdong Plateau
[0067]
[0068] Corresponding to the aforementioned method for evaluating the weathering degree of Cretaceous sandstone in the plateau, this invention also discloses a system for evaluating the weathering degree of Cretaceous sandstone in the plateau, which specifically includes:
[0069] The typical area determination module is used to select typical Cretaceous sandstone distribution areas as target study areas based on the distribution areas of Cretaceous sandstone in the plateau and the influencing factors of weathering.
[0070] The evaluation index system construction module is used to establish an evaluation index system for the weathering degree of Cretaceous sandstone by combining the influencing factors and weathering mechanisms of weathering in the region, and to qualitatively classify the Cretaceous sandstone strata according to the degree of rock weathering from the surface to the ground.
[0071] The detection module is used to collect samples of the required evaluation rocks at different depths in the Cretaceous sandstone strata within the target study area, and to detect and obtain the evaluation index values of various weathering degree of the required evaluation rocks at different depths.
[0072] The function fitting module is used to perform function fitting analysis on the various weathering degree evaluation index values of the rocks to be evaluated at different depths and the depth data to obtain the functional relationship between the weathering degree evaluation index values and the depth.
[0073] The grading boundary delineation module is used to determine the index delineation boundary values of strata with different weathering degrees based on the functional relationship between the evaluation index values of each weathering degree and the depth, thereby establishing an evaluation system for the weathering degree of Cretaceous sandstone in the plateau.
[0074] It should be noted that for a detailed description of the weathering degree evaluation system for plateau Cretaceous sandstone provided in the embodiments of the present invention, please refer to the relevant description of the weathering degree evaluation method for plateau Cretaceous sandstone provided in the embodiments of this application, which will not be repeated here.
[0075] In addition, embodiments of the present invention also provide an electronic device, the device comprising: a processor and a memory; the memory being used to store one or more program instructions; the processor being used to execute one or more program instructions to perform the steps of a method for evaluating the weathering degree of Cretaceous sandstone in plateau regions as described in any of the preceding embodiments.
[0076] It should be noted that for a detailed description of an electronic device provided in the embodiments of the present invention, please refer to the relevant description of a method for evaluating the weathering degree of Cretaceous sandstone in the plateau provided in the embodiments of this application, which will not be repeated here.
[0077] In addition, embodiments of the present invention also provide a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the method for evaluating the weathering degree of Cretaceous sandstone in the plateau as described in any of the preceding claims.
[0078] It should be noted that for a detailed description of a computer-readable storage medium provided in the embodiments of the present invention, please refer to the relevant description of a method for evaluating the weathering degree of Cretaceous sandstone in the plateau provided in the embodiments of this application, which will not be repeated here.
[0079] Those skilled in the art will understand that all or part of the functions of the various methods in the above embodiments can be implemented by hardware or by computer programs. When all or part of the functions in the above embodiments are implemented by computer programs, the program can be stored in a computer-readable storage medium, which may include: read-only memory, random access memory, disk, optical disk, hard disk, etc., and the program is executed by a computer to achieve the above functions. For example, the program can be stored in the memory of a device, and when the program in the memory is executed by the processor, all or part of the above functions can be achieved. In addition, when all or part of the functions in the above embodiments are implemented by computer programs, the program can also be stored in a server, another computer, disk, optical disk, flash drive, or external hard drive, etc., and can be downloaded or copied to the memory of a local device, or the system of the local device can be updated. When the program in the memory is executed by the processor, all or part of the functions in the above embodiments can be achieved.
[0080] The above examples illustrate the present invention only to aid in understanding it and are not intended to limit the scope of the invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the principles of this invention.
Claims
1. A method for evaluating the weathering degree of plateau Cretaceous sandstone, characterized in that, The method comprises: Based on the distribution area of plateau Cretaceous sandstone and the influencing factors of weathering, a typical Cretaceous sandstone distribution area is selected as the target research area; Combined with the influencing factors of weathering and the weathering mechanism in the region, an evaluation index system of weathering degree of Cretaceous sandstone is established, and the Cretaceous sandstone formation is qualitatively classified according to the rock weathering degree from the ground to the underground; The rock required to be evaluated at different depths in the Cretaceous sandstone formation in the target research area is sampled and collected, and the values of various weathering degree evaluation indexes of the rock required to be evaluated at different depths are detected and obtained; The values of various weathering degree evaluation indexes of the rock required to be evaluated at different depths are functionally fitted and analyzed with the depth data to obtain the functional relationship of each weathering degree evaluation index value with the depth; Based on the functional relationship of each weathering degree evaluation index value with the depth, the index division limit value of the stratum with different grades of weathering degree is determined, and thus the weathering degree evaluation system of plateau Cretaceous sandstone is established.
2. The method for evaluating the weathering degree of high plateau chalk sandstone according to claim 1, characterized in that, Based on the distribution area of plateau Cretaceous sandstone and the influencing factors of weathering, a typical Cretaceous sandstone distribution area is selected as the target research area, which specifically comprises: Through detailed collection of regional engineering geological and hydrogeological data, combined with regional survey data including previous drilling results, geophysical prospecting results and survey reports, the Cretaceous sandstone distribution area and weathering influencing factors in the region are analyzed, and then a typical sandstone distribution area is selected as the target research area.
3. The method for evaluating the weathering degree of high plateau chalk sandstone according to claim 1, characterized in that, Combined with the influencing factors of weathering and the weathering mechanism in the region, an evaluation index system of weathering degree of Cretaceous sandstone is established, which specifically comprises: Considering that the main factors affecting weathering include groundwater level change and occurrence and migration conditions, groundwater salinity and seasonal temperature change, the mechanism of rock weathering is the expansion of internal mineral cracks and the loss of fine particle material.
4. The method for evaluating the weathering degree of high plateau chalk sandstone according to claim 1, characterized in that, Combined with the influencing factors of weathering and the weathering mechanism in the region, an evaluation index system of weathering degree of Cretaceous sandstone is established, which specifically comprises: The selected weathering degree evaluation indexes in the macro aspect include density loss rate and wave velocity loss rate, and the selected weathering degree evaluation indexes in the micro aspect include porosity, CT value and mineral chemical content, wherein the measured index value of the intact rock at the bottom of the deep hole with a hole depth greater than a preset value is selected as the standard reference of unweathered rock.
5. The method for evaluating the weathering degree of high plateau chalk sandstone according to claim 4, characterized in that, The evaluation index system of weathering degree of Cretaceous sandstone is established, which specifically comprises: The density loss rate is the ratio of the measured rock density to the unweathered rock density; The wave velocity loss rate is the square ratio of the measured rock wave velocity to the unweathered rock wave velocity; The porosity takes the porosity value of the rock in a single polarizing microscope as an evaluation index; The CT value is obtained by scanning the inside of the rock by a CT scanner; The mineralogical content is detected by means of XRD, taking CIA as the evaluation index of the loss of mineral elements, wherein CIA refers to the molar percentage content of alumina in the rock, Caco refers to the molar percentage content of calcium oxide in the rock, CNaO refers to the molar percentage content of sodium oxide in the rock, CNaO refers to the molar percentage content of potassium oxide in the rock, and the higher the CIA value, the more intense the weathering.
6. The method for evaluating the weathering degree of high plateau chalk sandstone according to claim 4, characterized in that, The Cretaceous sandstone formation is qualitatively classified according to the rock weathering degree from the ground to the underground, which specifically comprises: From the ground to the underground, the Cretaceous sandstone formation is sequentially divided into fully weathered, strongly weathered, weakly weathered, slightly weathered and unweathered.
7. The method for evaluating the weathering degree of high plateau chalk sandstone according to claim 1, characterized in that, Based on the functional relationship of each weathering degree evaluation index value with the depth, the index division limit value of the stratum with different grades of weathering degree is determined, and thus the weathering degree evaluation system of plateau Cretaceous sandstone is established, which specifically comprises: According to the function relationship curve of the evaluation index value of each weathering degree changing with depth, an obvious gradient change point is selected as a boundary point for weathering degree grading.
8. The method for evaluating the weathering degree of high plateau chalk sandstone according to claim 6, characterized in that, The weathering degree evaluation system of plateau Cretaceous sandstone is established, specifically including: For unweathered: density loss rate ≤20, wave velocity loss rate ≤35, CT value ≥1350, porosity ≥10%, CIA ≤20; For weak weathering: density loss rate range is 20~40, wave velocity loss rate range is 35~50, CT value range is 1250~1270, porosity range is 15%~20%, CIA range is 30~40; For strong weathering: density loss rate range is 40~50, wave velocity loss rate range is 50~65, CT value range is 1200~1250, porosity range is 20%~25%, CIA range is 40~50; For fully weathered: density loss rate ≥50, wave velocity loss rate ≥65, CT value ≤1200, porosity ≥25%, CIA ≥50.
9. A system for evaluating the degree of weathering of high plateau Cretaceous sandstone, characterized by The system comprises: A typical area determination module is configured to select a typical Cretaceous sandstone distribution area as a target research area based on a plateau Cretaceous sandstone distribution area and weathering influencing factors; An evaluation index system construction module is configured to establish a Cretaceous sandstone weathering degree evaluation index system in combination with weathering influencing factors and weathering mechanisms in the area, and qualitatively classify Cretaceous sandstone strata according to rock weathering degree from the ground to the underground; A detection module is configured to sample and collect rocks required for evaluation at different depths in Cretaceous sandstone strata in the target research area, and detect and obtain evaluation index values of the rocks required for evaluation at different depths; A function fitting module is configured to perform function fitting analysis on the evaluation index values of the rocks required for evaluation at different depths and depth data, and obtain a function relationship of the evaluation index values changing with depth; A grading boundary division module is configured to determine index division boundary values of different weathering degree strata based on the function relationship of the evaluation index values changing with depth, and thereby establish a weathering degree evaluation system of plateau Cretaceous sandstone.
10. An electronic device, comprising: The device comprises a processor and a memory; The memory is configured to store one or more program instructions; The processor is configured to run the one or more program instructions to perform the steps of the method for evaluating weathering degree of plateau Cretaceous sandstone according to any one of claims 1 to 8.