A method for grading weak rock zones
By marking points on weak rock zones and recording penetration depths using penetration nails, a grading system table is generated, which solves the problem of low accuracy in existing grading methods, achieving more accurate grading and data support, and supporting subsequent construction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA HYDROELECTRIC ENGINEERING CONSULTING GROUP CHENGDU RESEARCH HYDROELECTRIC INVESTIGATION DESIGN AND INSTITUTE
- Filing Date
- 2022-11-23
- Publication Date
- 2026-05-19
AI Technical Summary
Existing methods for classifying weak rock zones have low accuracy and lack data support, making them unable to provide a reasonable and effective reference for subsequent construction.
By marking multiple weak rock zones at the test sites and marking multiple test points on each weak rock zone, a penetration rod is used to penetrate each point with the same kinetic energy. The penetration depth is recorded, and a penetration depth statistical table is generated. The statistical table is combined to perform preliminary classification and correction, forming a classification system table based on penetration depth.
It improved the accuracy of weak rock zone classification, provided data support, and offered a reasonable reference for subsequent construction.
Smart Images
Figure CN115758757B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of geotechnical engineering technology, specifically to a method for classifying weak rock zones. Background Technology
[0002] The geological conditions for the site selection of water conservancy and hydropower projects are extremely complex. In particular, there are generally weak rock zones of different sizes and properties in adits and tunnels. The impact of weak rock zones of different properties on the construction of the project is different, and different engineering treatment measures need to be taken to treat them.
[0003] Existing methods for classifying weak rock zones generally classify them based on their development scale, such as the width and length of the weak rock zone. These methods have low accuracy and lack data support, making them unsuitable for providing reasonable and effective references for subsequent construction. Summary of the Invention
[0004] The purpose of this invention is to provide a method for classifying weak rock zones, which can solve the technical problems of low accuracy and lack of data support in existing methods for classifying weak rock zones.
[0005] This invention is achieved through the following technical solution:
[0006] A method for classifying weak rock zones includes the following steps:
[0007] Mark multiple weak rock zones at the test sites;
[0008] Mark multiple test points for each of the aforementioned weak rock zones;
[0009] A penetration nail is obtained, and each of the test points is penetrated with the same kinetic energy using the penetration nail to obtain the penetration depth of each test point. Based on the penetration depth of all the test points of each weak rock zone, the average penetration depth of each weak rock zone is obtained and summarized to generate a statistical table of penetration depth of weak rock zones.
[0010] Based on the penetration depth statistics table of the weak rock zone, the multiple weak rock zones to be tested are initially classified and corrected to generate a weak rock zone classification system table based on penetration depth.
[0011] Based on the penetration depth statistics table of the weak rock zones and the weak rock zone classification system table based on penetration depth, the multiple weak rock zones to be tested are classified.
[0012] Optionally, marking multiple test points on each of the weak rock zones to be tested includes the following steps:
[0013] Determine the development and extension direction of the weak rock zone to be tested;
[0014] Multiple test points are marked along the development and extension direction of the weak rock zone to be tested at a first preset interval.
[0015] Optionally, the first preset spacing is 10-20cm.
[0016] Optionally, the preliminary classification and correction of multiple weak rock zones to be tested by combining the penetration depth statistics table of the weak rock zones includes the following steps:
[0017] Referring to the average penetration depth of the weak rock zone to be tested, multiple weak rock zones to be tested are preliminarily classified based on experience, resulting in multiple classification levels;
[0018] Based on the penetration depth statistics table of the weak rock zone, determine the maximum and minimum values among all the average penetration depths, and use the maximum and minimum values as the endpoint values of the numerical intervals to form the total depth interval.
[0019] The total depth interval is segmented according to the number of the grading levels to obtain multiple depth intervals. The multiple depth intervals are then matched and associated with the multiple grading levels to generate the weak rock zone grading system table based on penetration depth.
[0020] Optionally, the segmentation is uniform segmentation.
[0021] Optionally, the number of hierarchical levels is 5.
[0022] Optionally, the preliminary classification and correction of multiple weak rock zones to be tested by combining the penetration depth statistics table of the weak rock zones includes the following steps:
[0023] Based on geological experience, multiple weak rock zones to be tested were initially classified to obtain multiple preliminary levels. Combined with the penetration depth statistics table of the weak rock zones, a preliminary classification table of weak rock zones was generated.
[0024] Based on the preliminary classification table of weak rock zones, the average penetration depth of all the weak rock zones to be tested that are at the same preliminary level is calculated to obtain multiple segment nodes, and a preliminary classification and segment node statistics table of weak rock zones is generated.
[0025] Based on the preliminary classification and segmentation node statistics table of the weak rock zone, multiple depth intervals are formed by using multiple segmentation nodes as endpoint values of numerical intervals.
[0026] Based on the number of depth intervals, multiple preliminary levels are corrected to obtain multiple grading levels, the number of grading levels being the same as the number of depth intervals, thereby generating a grading system table for weak rock zones based on penetration depth.
[0027] Optionally, the difference between the number of hierarchical levels and the number of preliminary levels is 1.
[0028] Optionally, classifying multiple weak rock zones to be tested according to the penetration depth statistics table of the weak rock zones and the weak rock zone classification system table based on penetration depth includes the following steps:
[0029] Referring to the penetration depth statistics table of the weak rock zone, the average penetration depth of each weak rock zone to be tested is compared with the numerical range of all depth intervals in the weak rock zone classification system table based on penetration depth to confirm the depth interval corresponding to the average penetration depth.
[0030] The classification level corresponding to the depth range is determined to obtain the classification level of the weak rock zone to be tested.
[0031] Optionally, the number of test points for each of the weak rock zones to be tested is 5.
[0032] Compared with the prior art, the present invention has the following advantages and beneficial effects:
[0033] This invention provides a method for classifying weak rock zones. By marking multiple weak rock zones at the test location, the scale and characteristics of the weak rock zones at that location are fully encompassed. Based on this, multiple test points are marked on each weak rock zone, and a penetration tester is used to penetrate each test point to obtain the penetration depth. The strength of the test point is quantified using the penetration depth, and the strength of the weak rock zone is quantified by the average penetration depth. Furthermore, a preliminary classification of the weak rock zones is performed to initially determine the level of each weak rock zone. Based on this, the preliminary classification is corrected using the average penetration depth of each weak rock zone. The average penetration depth serves as data support to guide the classification results, thereby effectively improving the accuracy of the classification results and forming a weak rock zone classification system table based on penetration depth. This table serves as the classification basis for the weak rock zones at the test location, providing a reasonable and effective reference for subsequent construction. Attached Figure Description
[0034] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:
[0035] Figure 1 The flowchart shows the weak rock zone classification method provided by the present invention. Detailed Implementation
[0036] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.
[0037] First, it should be noted that during their research and experimentation, the inventors discovered that the penetration depth of weak rock zones of different strengths by penetrating nails of the same kinetic energy exhibits a clear regularity: weaker rock zones show greater penetration depths, while stronger rock zones show smaller penetration depths. Therefore, using penetrating nails to guide the grading of weak rock zones is highly feasible.
[0038] It should be noted that the penetrating nail refers to a nail-like object with a pointed tip for penetrating.
[0039] Please refer to Figure 1 This invention provides a method for classifying weak rock zones, comprising the following steps:
[0040] S1. Mark multiple weak rock zones at the test locations;
[0041] S2. Mark multiple test points on each of the aforementioned weak rock zones to be tested;
[0042] S3. Obtain the penetration nail, and use the penetration nail to penetrate each of the test points with the same kinetic energy to obtain the penetration depth of each of the test points. Based on the penetration depth of all the test points of each of the weak rock zones to be tested, obtain the average penetration depth of each of the weak rock zones to be tested and summarize it to generate a statistical table of penetration depth of weak rock zones.
[0043] S4. Based on the penetration depth statistics table of the weak rock zone, perform preliminary classification and correction on multiple weak rock zones to be tested, and generate a weak rock zone classification system table based on penetration depth.
[0044] S5. According to the penetration depth statistics table of the weak rock zone and the weak rock zone classification system table based on penetration depth, classify the multiple weak rock zones to be tested.
[0045] The weak rock zone classification method provided by this invention fully encompasses the scale and characteristics of weak rock zones at the test location by marking multiple weak rock zones. Based on this, multiple test points are marked on each weak rock zone, and a penetration tester is used to penetrate each test point to obtain the penetration depth. The strength of the test point is quantified using the penetration depth, and the strength of the weak rock zone is quantified by the average penetration depth. Furthermore, a preliminary classification of the weak rock zones is performed to initially determine the level of each zone. The preliminary classification is then corrected based on the average penetration depth of each zone. The average penetration depth serves as data support to guide the classification results, thereby effectively improving the accuracy of the classification results and forming a weak rock zone classification system table based on penetration depth. This table serves as the classification basis for the weak rock zones at the test location, providing a reasonable and effective reference for subsequent construction. This method is simple and easy to implement, and can be directly applied at the test location.
[0046] Furthermore, marking multiple test points on each of the weak rock zones to be tested includes the following steps:
[0047] S2.1 Determine the development and extension direction of the weak rock zone to be tested;
[0048] S2.2 Mark multiple test points along the development and extension direction of the weak rock zone to be tested at a first preset interval.
[0049] Specifically, the marking method involves spraying paint onto the test points and marking the test number next to the weak rock zone to be tested.
[0050] Preferably, the first preset spacing is 10-20cm.
[0051] Preferably, the number of test points in each of the weak rock zones to be tested is 5.
[0052] It should be noted that any existing device can be used to energize the penetrating nail. For example, any existing energizing device that accumulates elastic potential energy through a spring and then converts the elastic potential energy into kinetic energy can be used. Alternatively, any existing magnetic energizing device can be used. Or, any existing hammer with a fixed striking force can be used to vertically strike the tail end of the penetrating nail. As long as a fixed kinetic energy can be imparted to the penetrating nail so that it moves along the axial direction, it is acceptable.
[0053] It should be noted that a scale line can be set along the axial direction on the penetration nail to determine the penetration depth; alternatively, any measuring tool in the existing technology can be used to measure the length of the part of the penetration nail outside the weak rock zone to be measured, and then the penetration depth can be calculated.
[0054] Furthermore, the preliminary classification and correction of multiple weak rock zones to be tested based on the penetration depth statistics table of the weak rock zones includes the following steps:
[0055] S4.1. Referring to the average penetration depth of the weak rock zone to be tested, the multiple weak rock zones to be tested are preliminarily classified according to experience to obtain multiple classification levels.
[0056] It should be noted that the above experience refers to the experience summarized from numerous grading experiments conducted at other test sites, namely the relationship between penetration depth and weak rock zone level, such as data reference obtained by fitting a large amount of data. The geological conditions of the other test sites should have a certain similarity to those of the test site to provide a more reasonable reference.
[0057] S4.2. Based on the penetration depth statistics table of the weak rock zone, determine the maximum and minimum values among all the average penetration depths, and use the maximum and minimum values as the endpoint values of the numerical intervals to form the total depth interval.
[0058] S4.3. Divide the total depth interval into multiple depth intervals according to the number of the grading levels, and associate the multiple depth intervals with the multiple grading levels to generate the weak rock zone grading system table based on penetration depth.
[0059] It should be noted that the above association method is as follows: multiple depth intervals are arranged from smallest to largest, and multiple hierarchical levels are arranged from largest to smallest. Then, the two are matched one-to-one according to the arrangement order, with the largest depth interval corresponding to the smallest hierarchical level.
[0060] Preferably, the segmentation is uniform segmentation.
[0061] Preferably, the number of the hierarchical levels is 5.
[0062] Optionally, unlike steps S4.1-S4.3 above, as another optional implementation, the preliminary classification and correction of multiple weak rock zones to be tested based on the penetration depth statistics table of the weak rock zones includes the following steps:
[0063] S4.4. Based on geological experience, the multiple weak rock zones to be tested are preliminarily classified to obtain multiple preliminary levels. Combined with the penetration depth statistics table of the weak rock zones, a preliminary classification table of weak rock zones is generated.
[0064] It should be noted that the above geological experience refers to geological elements such as the development width, characteristics, groundwater conditions, and material composition of weak rock zones. This geological experience is all human experience and generally lacks data support, and it is not directly related to the penetration depth.
[0065] S4.5. Based on the preliminary classification table of weak rock zones, calculate the average penetration depth of all the weak rock zones to be tested that are at the same preliminary level, obtain multiple segment nodes, and generate a preliminary classification and segment node statistics table of weak rock zones.
[0066] S4.6. Based on the preliminary classification and segmentation node statistics table of the weak rock zone, multiple depth intervals are formed by using multiple segmentation nodes as endpoint values of numerical intervals.
[0067] S4.7. Based on the number of depth intervals, the preliminary levels are corrected to obtain multiple grading levels. The number of grading levels is the same as the number of depth intervals, and a grading system table of weak rock zones based on penetration depth is generated.
[0068] Preferably, the number of preliminary levels is 5.
[0069] Preferably, the difference between the number of hierarchical levels and the number of preliminary levels is 1.
[0070] Furthermore, the step of classifying multiple weak rock zones to be tested according to the penetration depth statistics table of the weak rock zones and the weak rock zone classification system table based on penetration depth includes the following steps:
[0071] S5.1 Referring to the penetration depth statistics table of the weak rock zone, the average penetration depth of each weak rock zone to be tested is compared with the numerical range of all depth intervals in the weak rock zone classification system table based on penetration depth, and the depth interval corresponding to the average penetration depth is confirmed.
[0072] S5.2 Determine the grading level corresponding to the depth range to obtain the grading level of the weak rock zone to be tested.
[0073] Example 1
[0074] This embodiment provides a method for classifying weak rock zones, including the following steps:
[0075] A. Mark multiple weak rock zones at the test location.
[0076] B. Mark 5 test points for each weak rock zone to be tested.
[0077] Specifically, the development and extension direction of each weak rock zone to be tested is determined, and five test points are marked along the development and extension direction of the weak rock zone to be tested at intervals of 10-20cm.
[0078] C. Select a type of penetration drill bit and use it to penetrate each test point with the same kinetic energy to obtain the penetration depth of each test point. Calculate the arithmetic mean of the penetration depths of all test points in each weak rock zone to obtain the average penetration depth of each weak rock zone and summarize them to generate a statistical table of penetration depths of weak rock zones, as shown in Table 1.
[0079] Table 1. Statistical table of penetration depth in weak rock zones.
[0080] The weak rock zone to be tested Average penetration depth (mm) ry1 12 ry2 30 ry3 24 ry4 36 ry5 5 ry6 38 … …
[0081] D. Based on the statistical table of penetration depth of weak rock zones (Table 1), a preliminary classification and correction were carried out on multiple weak rock zones to be tested, and a classification system table of weak rock zones based on penetration depth was generated, as shown in Table 2.
[0082] Specifically, referring to the average penetration depth of the weak rock zone to be tested, multiple weak rock zones to be tested are initially classified according to experience, resulting in 5 classification levels (Ⅰ Very poor, Ⅱ Poor, Ⅲ Average, Ⅳ Good, Ⅴ Very good). According to the penetration depth statistics table of the weak rock zone (Table 1), the maximum and minimum values of all average penetration depths are determined. In this embodiment, the maximum value is 50 and the minimum value is 0. The maximum and minimum values are used as the endpoints of the numerical intervals to form a total depth interval, i.e. [0, 50]. The total depth interval is evenly divided according to the number of classification levels (5), resulting in 5 depth intervals, i.e. [0, 10], (10, 20], (20, 30], (30, 40], (40, 50]. The 5 depth intervals and 5 classification levels are then matched and associated one by one to generate a weak rock zone classification system table based on penetration depth.
[0083] Table 2. Classification system of weak rock zones based on penetration depth.
[0084] Classification level Depth range (mm) Ⅴ 0≤x≤10 Ⅳ 10＜x≤20 Ⅲ 20＜x≤30 Ⅱ 30＜x≤40 Ⅰ 40＜x≤50
[0085] E. Based on the statistical table of penetration depth of weak rock zones (Table 1) and the classification system table of weak rock zones based on penetration depth (Table 2), multiple weak rock zones to be tested are classified.
[0086] Specifically, referring to the penetration depth statistics table of weak rock zones (Table 1), the average penetration depth of each weak rock zone to be tested is compared with the numerical range of all depth intervals in the weak rock zone classification system table based on penetration depth (Table 2) to confirm the depth interval corresponding to the average penetration depth, and then determine the classification level corresponding to the depth interval to obtain the classification level of the weak rock zone to be tested, as shown in Table 3.
[0087] Table 3 Classification of Weak Rock Zones
[0088] The weak rock zone to be tested Average penetration depth (mm) Classification level ry1 12 Ⅳ ry2 30 Ⅲ ry3 24 Ⅲ ry4 36 Ⅱ ry5 5 Ⅴ ry6 38 Ⅱ … …
[0089] Example 2
[0090] A. Mark multiple weak rock zones at the test location.
[0091] B. Mark 5 test points for each weak rock zone to be tested.
[0092] Specifically, the development and extension direction of each weak rock zone to be tested is determined, and five test points are marked along the development and extension direction of the weak rock zone to be tested at intervals of 10-20cm.
[0093] C. Select a type of penetration drill bit and use it to penetrate each test point with the same kinetic energy to obtain the penetration depth of each test point. Calculate the arithmetic mean of the penetration depths of all test points in each weak rock zone to obtain the average penetration depth of each weak rock zone and summarize them to generate a statistical table of penetration depths of weak rock zones, as shown in Table 1.
[0094] Table 1. Statistical table of penetration depth in weak rock zones.
[0095] The weak rock zone to be tested Average penetration depth (mm) ry1 12 ry2 30 ry3 24 ry4 36 ry5 5 ry6 38 … …
[0096] D. Based on the statistical table of penetration depth of weak rock zones (Table 1), a preliminary classification and correction were carried out on multiple weak rock zones to be tested, and a classification system table of weak rock zones based on penetration depth was generated, as shown in Table 6.
[0097] Specifically, based on geological experience, multiple weak rock zones to be tested were initially classified into five preliminary levels (I very poor, II poor, III fair, IV good, V very good). Combined with the penetration depth statistics table of the weak rock zones (Table 1), a preliminary classification table of weak rock zones was generated, as shown in Table 4.
[0098] Table 4 Preliminary Classification of Weak Rock Zones
[0099]
[0100]
[0101] Furthermore, based on the preliminary classification table of weak rock zones (Table 4), the average penetration depth of all weak rock zones to be tested at the same preliminary level is calculated (that is, the average penetration depth of all weak rock zones at the same preliminary level is added together and divided by the number of all average penetration depths), resulting in 5 segment nodes, namely 9, 21, 32, 41, and 48. A preliminary classification and segment node statistics table of weak rock zones is generated, as shown in Table 5.
[0102] Table 5. Preliminary Classification and Segmentation Node Statistics of Weak Rock Zones
[0103] Preliminary level Segmentation node (mm) Ⅴ 9 Ⅳ 21 Ⅲ 32 Ⅱ 41 Ⅰ 48
[0104] Furthermore, based on the preliminary classification and segmentation node statistics table of the weak rock zone (Table 5), using 5 segmentation nodes as the endpoint values of the numerical intervals, 6 depth intervals are formed, namely (0,9], (9,21], (21,32], (32,41], (41,48], (48, positive infinity). According to the number of depth intervals, the 5 preliminary levels are corrected to obtain 6 classification levels (Ⅰ Very poor, Ⅱ Poor, Ⅲ Average, Ⅳ Good, Ⅴ Very good, Ⅵ Excellent), generating a weak rock zone classification system table based on penetration depth (Table 6).
[0105] Table 6. Classification system of weak rock zones based on penetration depth
[0106] Classification level Depth range (mm) Ⅵ X≤9 Ⅴ 9＜x≤21 Ⅳ 21＜x≤32 Ⅲ 32＜x≤41 Ⅱ 41＜x≤48 Ⅰ x＞48
[0107] E. Based on the statistical table of penetration depth of weak rock zones and the classification system table of weak rock zones based on penetration depth, classify multiple weak rock zones to be tested.
[0108] Specifically, referring to the penetration depth statistics table of weak rock zones (Table 1), the average penetration depth of each weak rock zone to be tested is compared with the numerical range of all depth intervals in the weak rock zone classification system table based on penetration depth (Table 6) to confirm the depth interval corresponding to the average penetration depth, and then determine the classification level corresponding to the depth interval to obtain the classification level of the weak rock zone to be tested, as shown in Table 7.
[0109] Table 7 Classification of Weak Rock Zones
[0110]
[0111]
[0112] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A method for classifying weak rock zones, characterized in that, Includes the following steps: Mark multiple weak rock zones at the test sites; Multiple test points are marked on each of the aforementioned weak rock zones; A penetration nail is obtained, and each of the test points is penetrated with the same kinetic energy using the penetration nail to obtain the penetration depth of each test point. Based on the penetration depth of all the test points of each weak rock zone, the average penetration depth of each weak rock zone is obtained and summarized to generate a statistical table of penetration depth of weak rock zones. Based on the penetration depth statistics table of the weak rock zones, the multiple weak rock zones to be tested are initially classified and corrected to generate a weak rock zone classification system table based on penetration depth. Based on the penetration depth statistics table of the weak rock zones and the weak rock zone classification system table based on penetration depth, the multiple weak rock zones to be tested are classified.
2. The method for classifying weak rock zones according to claim 1, characterized in that, Marking multiple test points on each of the aforementioned weak rock zones includes the following steps: Determine the development and extension direction of the weak rock zone to be tested; Multiple test points are marked along the development and extension direction of the weak rock zone to be tested at a first preset interval.
3. The method for classifying weak rock zones according to claim 2, characterized in that, The first preset spacing is 10-20cm.
4. The method for classifying weak rock zones according to claim 1, characterized in that, The preliminary classification and correction of multiple weak rock zones to be tested, based on the penetration depth statistics table of the weak rock zones, includes the following steps: Referring to the average penetration depth of the weak rock zone to be tested, multiple weak rock zones to be tested are preliminarily classified based on experience, resulting in multiple classification levels; Based on the penetration depth statistics table of the weak rock zone, determine the maximum and minimum values among all the average penetration depths, and use the maximum and minimum values as the endpoint values of the numerical intervals to form the total depth interval. The total depth interval is segmented according to the number of the grading levels to obtain multiple depth intervals. The multiple depth intervals are then matched and associated with the multiple grading levels to generate the weak rock zone grading system table based on penetration depth.
5. The method for classifying weak rock zones according to claim 4, characterized in that, The segmentation is uniform.
6. The method for classifying weak rock zones according to claim 4, characterized in that, The number of hierarchical levels is 5.
7. The method for classifying weak rock zones according to claim 1, characterized in that, The preliminary classification and correction of multiple weak rock zones to be tested, based on the penetration depth statistics table of the weak rock zones, includes the following steps: Based on geological experience, multiple weak rock zones to be tested were initially classified to obtain multiple preliminary levels. Combined with the penetration depth statistics table of the weak rock zones, a preliminary classification table of weak rock zones was generated. Based on the preliminary classification table of weak rock zones, the average penetration depth of all the weak rock zones to be tested that are at the same preliminary level is calculated to obtain multiple segment nodes, and a preliminary classification and segment node statistics table of weak rock zones is generated. Based on the preliminary classification and segmentation node statistics table of the weak rock zone, multiple depth intervals are formed by using multiple segmentation nodes as endpoint values of numerical intervals. Based on the number of depth intervals, multiple preliminary levels are corrected to obtain multiple grading levels, the number of grading levels being the same as the number of depth intervals, thereby generating a grading system table for weak rock zones based on penetration depth.
8. The method for classifying weak rock zones according to claim 7, characterized in that, The difference between the number of hierarchical levels and the number of preliminary levels is 1.
9. The method for classifying weak rock zones according to claim 7, characterized in that, The step of classifying multiple weak rock zones to be tested according to the penetration depth statistics table of the weak rock zones and the weak rock zone classification system table based on penetration depth includes the following steps: Referring to the penetration depth statistics table of the weak rock zone, the average penetration depth of each weak rock zone to be tested is compared with the numerical range of all depth intervals in the weak rock zone classification system table based on penetration depth to confirm the depth interval corresponding to the average penetration depth. The classification level corresponding to the depth range is determined to obtain the classification level of the weak rock zone to be tested.
10. The method for classifying weak rock zones according to claim 1, characterized in that, The number of test points for each of the aforementioned weak rock zones is 5.