CN114045883B - Rock slope surface soil body fracture network risk evaluation method based on soil body drying test - Google Patents
Rock slope surface soil body fracture network risk evaluation method based on soil body drying test Download PDFInfo
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Abstract
The application discloses a rock slope surface layer soil body fracture network risk evaluation method based on a soil body drying test, wherein a soil body surface layer fracture rate index a is obtained according to the drying test result of an indoor soil body; acquiring a soil body surface layer crack width index b according to the drying test result of the indoor soil body; acquiring a soil body surface layer crack depth index c according to a drying test result of an indoor soil body; according to the obtained soil body surface layer related fracture parameter information, defining a rock slope soil body surface layer fracture network risk contribution degree index model as follows: FRCI =0.35 × a +0.3 × b +0.35 × c; the FRCI is a contribution degree index of the risk of the soil fracture network on the surface layer of the rock slope, and the smaller the FRCI value is, the lower the risk of the soil fracture network on the surface layer of the rock slope is. The method has the advantages that quantitative evaluation is carried out on the fracture network of the foreign soil layer, an evaluation system is enriched, and the risk of the soil body fractures on the surface layer of the rock slope is accurately and quickly evaluated.
Description
Technical Field
The invention belongs to the technical field of geotechnical engineering, and particularly relates to a rock slope surface soil body fracture network risk evaluation method based on a soil body drying test.
Background
With the vigorous promotion of national infrastructure construction, particularly large-scale hydraulic and hydroelectric engineering, railway and highway engineering and mine engineering construction, the related slope problem is more and more complex, the research on the slope is more and more deep, and particularly the research on the protection measures of the high and steep rocky slope is always a research hotspot in the engineering fields of rock and soil, geology and the like. Although the traditional rock slope protection technology (such as concrete spraying and stone masonry slope protection) can obviously improve the stability of a slope body, the greening effect and the ecological environment effect are poor, and the method is contrary to the development concept of ecological environment protection.
In recent years, vegetation slope protection greening technology is widely applied to engineering practice as a novel slope protection governing technology, and not only can improve the stability of a slope to a certain extent and prevent geological disasters, but also can improve ecological environment and promote green development. As a main slope protection greening technology in China, the alien soil spray seeding technology is a main slope protection greening technology, and the main alien soil base material (clay) is easy to crack due to water loss under the drought climate condition, so that the protection effect of the actual slope engineering is seriously affected, and therefore, the research on the drying shrinkage cracking characteristic of the cohesive soil and how to effectively improve the cracking problem of the cohesive soil is the key point of attention of scholars at home and abroad at present. Meanwhile, establishing a set of feasible, comprehensive, rapid and accurate evaluation method for the risk of the soil body surface layer fracture network is an urgent task.
Disclosure of Invention
The technical problem to be solved is as follows: the method mainly provides a rock slope surface soil body fracture network risk evaluation method based on a soil body drying test, solves the technical problems that the protection effect of the actual slope engineering is seriously influenced and the like in the prior art, quantitatively evaluates the fracture network of a soil dressing layer, enriches an evaluation system of the rock slope surface soil body fracture network, and further accurately and quickly effectively evaluates the risk of the rock slope surface soil body fracture.
The technical scheme is as follows:
a rock slope surface layer soil body fracture network risk evaluation method based on a soil body drying test specifically comprises the following steps:
s10: acquiring a soil surface layer crack rate index a according to the drying test result of the indoor soil;
s20: acquiring a soil surface layer crack width index b according to the drying test result of the indoor soil;
s30: acquiring a soil surface layer crack depth index c according to the drying test result of the indoor soil;
s40: according to the obtained soil body surface layer related fracture parameter information, defining a soil body surface layer fracture network risk contribution degree index model: FRCI =0.35 × a +0.3 × b +0.35 × c;
the FRCI is an index of contribution degree of risk of the soil body surface layer fracture network, the greater the FRCI value is, the higher the risk generated by the soil body surface layer fracture network is, and the smaller the FRCI value is, the lower the risk of the soil body fracture network of the rock slope surface layer is.
As a preferred technical scheme of the invention: the fracture network risk is low when FRCI e (0,25), low when FRCI e (25,50), high when FRCI e (50,75), and high when FRCI e (75,100).
As a preferred technical scheme of the invention: the method for calculating the crack rate index a comprises the following steps:
s11: obtaining a soil sample with stable surface layer fracture network development through a drying test;
s12, taking a picture of the surface of the sample: acquiring a picture of a soil sample surface layer fracture network through a shooting device;
s13, analyzing and counting the crack rate C by software r : calculating and extracting the soil body surface layer fracture rate C by analysis software r ；
S14: according to the crack rate C r The numerical value of (A) is assigned as the crack rate index a.
As a preferred technical scheme of the invention: the crack rate index a is according to the crack rate C of the soil surface layer r When the soil surface layer crack rate is more than 0 and less than C r When the content is less than or equal to 5 percent, the a =5; when the surface crack rate of the soil body is more than 5 percent and C r When the content is less than or equal to 10%, the a =10; when the surface layer crack rate of the soil body is more than 10 percent and C r When the content is less than or equal to 15 percent, the a =15; when the surface layer crack rate of the soil body is more than 15 percent and C r When the content is less than or equal to 20 percent, the a =20; when the surface layer crack rate of the soil body is more than 20 percent and C r When the content is less than or equal to 25 percent, the a =25; when the surface crack rate of the soil body is more than 25% < C r When the content is less than or equal to 30 percent, the a =30; when the surface layer crack rate of the soil body30％＜C r When the content is less than or equal to 35 percent, the a =35; when the surface crack rate of the soil body is more than 35 percent and C r When the content is less than or equal to 40 percent, the a =40; when the surface layer crack rate of the soil body is more than 40 percent and C r When the content is less than or equal to 45 percent, the a =45; when the surface crack rate of the soil body is more than 45 percent and C r When the content is less than or equal to 50%, the a =50; when the surface layer crack rate of the soil body is more than 50 percent and C r When the content is less than or equal to 55 percent, the a =55; when the surface crack rate of the soil body is more than 55 percent C r When the content is less than or equal to 60 percent, the a =60; when the surface layer crack rate of the soil body is more than 60 percent and C r When the content is less than or equal to 65 percent, the a =65; when the surface layer crack rate of the soil body is more than 65 percent and C r When the content is less than or equal to 70%, the a =70; when the surface layer crack rate of the soil body is more than 70 percent C r When the content is less than or equal to 75 percent, the a =75; when the surface crack rate of the soil body is more than 75 percent and C r When the content is less than or equal to 80%, the a =80; when the surface layer crack rate of the soil body is more than 80 percent and C r When the content is less than or equal to 85 percent, the a =85; when the surface crack rate of the soil body is more than 85 percent and C r When the content is less than or equal to 90%, the a =90; when the surface layer crack rate of the soil body is more than 90 percent and C r When the content is less than or equal to 95%, the a =95; when the surface layer crack rate of the soil body is more than 95 percent and C r When the content is less than or equal to 100 percent, the a =100.
As a preferred technical scheme of the invention: the statistical method of the soil body surface layer crack width index b comprises the following steps:
s21: obtaining a soil sample with stable surface layer fracture network development through a drying test;
s22, taking a picture of the surface of the sample: acquiring a picture of a soil sample surface layer fracture network through a shooting device;
s23, analyzing and counting the average width d of each crack by software: calculating and extracting the average width d of each crack on the surface layer of the soil body through analysis software;
s24, calculating the variance sigma 2 : the variance sigma is obtained by calculation 2 ；
S25: according to variance σ 2 The numerical value of (b) is assigned as the fracture index b.
As a preferred technical scheme of the invention: said fissure index b being dependent on the variance σ 2 Is determined when the variance 0 < sigma 2 2 or less, and b =25; when the variance 2 < sigma 2 5 or less, and b =40;when variance 5 < sigma 2 10 or less, said b =50; when the variance is 10 < sigma 2 15 or less, said b =75; when variance σ 2 > 15, said b =100.
As a preferred technical scheme of the invention: the statistical method of the soil body surface layer crack depth index c comprises the following steps:
s31: obtaining a soil sample with stable surface layer fracture network development through a drying test;
s32, taking a picture of the surface of the sample: acquiring a picture of a soil sample surface layer fracture network through a shooting device;
s33, analyzing and counting the total number N of the fractures by software: calculating and extracting the total number N of the soil body surface layer cracks through analysis software;
s34, measuring the depth h of each crack c : measuring the maximum crack depth h by extending the tape into the crack c ；
S35: according to the measured maximum depth h of the crack c Defining the ratio x of the fracture depths as follows: x = h c /h；
Wherein x is the ratio of the fracture depth; h is the depth of the soil body.
S36: counting the number of the fractures with the same fracture depth ratio x according to the computed fracture depth ratio x, and recording the number as n;
s37: classifying fractures with different depths according to the computed fracture depth ratio x, wherein the fracture depth ratio x is defined as a fracture depth index c, and the computing method is c = N/N;
wherein n is the number of the cracks with the same crack depth ratio x; n is the total number of cracks.
As a preferred technical scheme of the invention: the classification standard of the ratio x of the depths of the soil body surface cracks is as follows:
Ⅰ、0＜h c h is less than or equal to 0.25 and is marked as x 1 And counting the corresponding n, which is recorded as n 1 ；
Ⅱ、0.25＜h c H is less than or equal to 0.5 and is marked as x 2 And counting the corresponding n, which is recorded as n 2 ；
Ⅲ、0.5＜h c H is less than or equal to 0.75 and is marked as x 3 And are combinedCounting corresponding n, and recording as n 3 ；
Ⅳ、0.75＜h c H is less than or equal to 1 and is marked as x 4 And counting the corresponding n, which is recorded as n 4 。
As a preferred technical scheme of the invention: the evaluation method of the soil body surface layer crack depth index c is defined as follows, c =5 × (n) 1 /N)+15×(n 2 /N)+30×(n 3 /N)+50×(n 4 /N)。
Has the advantages that: compared with the prior art, the technical scheme adopted by the rock slope surface soil body fracture network risk evaluation method based on the soil body drying test has the following technical effects:
1. the method has the advantages that quantitative evaluation is carried out on the fracture network of the foreign soil layer, an evaluation system of the rock slope surface soil body fracture network is enriched, risks existing in rock slope surface soil body fractures are further accurately and rapidly effectively evaluated, and a series of safety accidents and economic losses caused by cracking of the slope surface soil body are effectively reduced.
2. Taking a certain rock slope in Nanjing as an example, the time for evaluating the risk of the surface soil body cracks of the slope by using the conventional method is about 5 days, and the risk evaluation of the surface soil body cracks can be finished in only 2 days, so that the time cost can be saved by more than one time.
Description of the drawings:
FIG. 1 is a flow chart of a rock slope surface layer soil body fracture network risk evaluation method based on a soil body drying test.
FIG. 2 is a schematic flow chart of the method for evaluating the risk of the soil body fracture network on the surface layer of the rock slope based on the soil body drying test.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A rock slope surface soil body fracture network risk evaluation method based on a soil body drying test is disclosed, as shown in figures 1 and 2, and comprises the following specific steps:
s10: acquiring a soil surface layer fracture rate index a according to a drying test result of an indoor soil body;
s20: acquiring a soil body surface layer crack width index b according to the drying test result of the indoor soil body;
s30: acquiring a soil surface layer crack depth index c according to the drying test result of the indoor soil;
s40: according to the obtained soil body surface layer related fracture parameter information, defining a soil body surface layer fracture network risk contribution degree index model: FRCI =0.35 × a +0.3 × b +0.35 × c;
the FRCI is an index of contribution degree of risk of the soil body surface layer fracture network, the greater the FRCI value is, the higher the risk generated by the soil body surface layer fracture network is, and the smaller the FRCI value is, the lower the risk of the soil body fracture network of the rock slope surface layer is.
The fracture network risk is low when FRCI e (0,25), low when FRCI e (25,50), high when FRCI e (50,75), and high when FRCI e (75,100).
The method for calculating the crack rate index a comprises the following steps: s11: obtaining a soil sample with stable surface layer fracture network development through a drying test;
s12, taking a picture of the surface of the sample: acquiring a picture of a soil sample surface layer fracture network through a shooting device;
s13, analyzing and counting the crack rate C by software r : calculating and extracting the soil body surface layer fracture rate C by analysis software r ；
S14: according to the crack rate C r The numerical value of (A) is assigned as the crack rate index a.
The crack rate index a is according to the crack rate C of the soil surface layer r When the value of the soil body surface layer crack is determinedRate 0 < C r When the content is less than or equal to 5 percent, the a =5; when the surface layer crack rate of the soil body is more than 5 percent and more than C r When the content is less than or equal to 10%, the a =10; when the surface layer crack rate of the soil body is more than 10 percent and C r When the content is less than or equal to 15 percent, the a =15; when the surface layer crack rate of the soil body is more than 15 percent and C r When the content is less than or equal to 20 percent, the a =20; when the surface layer crack rate of the soil body is more than 20 percent and C r When the content is less than or equal to 25 percent, the a =25; when the surface crack rate of the soil body is more than 25% < C r When the content is less than or equal to 30 percent, the a =30; when the surface layer crack rate of the soil body is more than 30 percent and C r When the content is less than or equal to 35 percent, the a =35; when the surface crack rate of the soil body is more than 35 percent and C r When the content is less than or equal to 40 percent, the a =40; when the surface layer crack rate of the soil body is more than 40 percent and C r When the content is less than or equal to 45 percent, the a =45; when the surface layer crack rate of the soil body is more than 45 percent and C r When the content is less than or equal to 50%, the a =50; when the surface layer crack rate of the soil body is more than 50 percent and C r When the content is less than or equal to 55 percent, the a =55; when the surface crack rate of the soil body is more than 55 percent C r When the content is less than or equal to 60 percent, the a =60; when the surface layer crack rate of the soil body is more than 60 percent and C r When the content is less than or equal to 65 percent, the a =65; when the surface layer crack rate of the soil body is more than 65 percent and C r When the content is less than or equal to 70%, the a =70; when the surface layer crack rate of the soil body is more than 70 percent C r When the content is less than or equal to 75 percent, the a =75; when the surface crack rate of the soil body is more than 75 percent and C r When the content is less than or equal to 80%, the a =80; when the surface layer crack rate of the soil body is more than 80 percent and C r When the content is less than or equal to 85 percent, the a =85; when the surface crack rate of the soil body is more than 85 percent and C r When the content is less than or equal to 90%, the a =90; when the surface layer crack rate of the soil body is more than 90 percent and C r When the content is less than or equal to 95%, the a =95; when the surface layer crack rate of the soil body is more than 95 percent and C r When the content is less than or equal to 100 percent, the a =100.
The statistical method of the soil body surface layer crack width index b comprises the following steps of S21: obtaining a soil sample with stable surface layer fracture network development through a drying test;
s22, taking a picture of the surface of the sample: acquiring a picture of a soil sample surface layer fracture network through a shooting device;
s23, analyzing and counting the average width d of each crack by software: calculating and extracting the average width d of each crack on the surface layer of the soil body through analysis software;
s24, calculating the variance sigma 2 : the variance sigma is obtained by calculation 2 ；
S25: according to variance σ 2 The numerical value of (b) is assigned as the fracture index b.
The fissure index b is based on the variance σ 2 Is determined when the variance 0 < sigma 2 2 or less, and b =25; when the variance 2 < sigma 2 5 or less, and b =40; when variance 5 < sigma 2 10 or less, said b =50; when the variance is 10 < sigma 2 15 or less, said b =75; when variance σ 2 > 15, said b =100.
The statistical method of the soil body surface layer crack depth index c comprises the following steps: s31: obtaining a soil sample with stable surface layer fracture network development through a drying test;
s32, taking a picture of the surface of the sample: acquiring a picture of a soil sample surface layer fracture network through a shooting device;
s33, analyzing and counting the total number N of the fractures by software: calculating and extracting the total number N of the soil body surface layer cracks through analysis software;
s34, measuring the depth h of each crack c : measuring the maximum crack depth h by extending the tape into the crack c ；
S35: according to the measured maximum depth h of the crack c Defining the ratio x of the fracture depths as follows: x = h c /h；
Wherein x is the ratio of the fracture depth; h is the depth of the soil body.
S36: counting the number of the fractures with the same fracture depth ratio x according to the computed fracture depth ratio x, and recording the number as n;
s37: classifying fractures with different depths according to the computed fracture depth ratio x, wherein the fracture depth ratio x is defined as a fracture depth index c, and the computing method is c = N/N;
wherein n is the number of cracks with the same crack depth ratio x; n is the total number of cracks.
The classification standard of the ratio x of the depths of the soil body surface cracks is as follows:
Ⅰ、0＜h c h is less than or equal to 0.25 and is marked as x 1 And counting the corresponding n, which is recorded as n 1 ；
Ⅱ、0.25＜h c H is less than or equal to 0.5 and is marked as x 2 And counting the corresponding n, which is recorded as n 2 ；
Ⅲ、0.5＜h c H is less than or equal to 0.75 and is marked as x 3 And counting the corresponding n, which is recorded as n 3 ；
Ⅳ、0.75＜h c H is less than or equal to 1 and is marked as x 4 And counting the corresponding n, which is recorded as n 4 。
The evaluation method of the soil body surface layer crack depth index c is defined as follows, c =5 × (n) 1 /N)+15×(n 2 /N)+30×(n 3 /N)+50×(n 4 /N)。
The rock slope surface soil body fracture network risk contribution index FRCI is shown in the following table 1.
TABLE 1 rock slope surface soil body fissure network risk contribution index FRCI
The technical scheme of the invention will be further explained by taking a rock slope in Nanjing as an example with reference to the attached drawings in the embodiment of the invention.
S41: the method comprises the steps of taking pictures of a soil fracture network of a surface layer of a side slope on site, importing the pictures into software for calculation, and counting to obtain the fracture rate C r =11%, the fracture rate index a =15 was obtained according to the rule of assignment.
S42: the method comprises the steps of taking pictures of a soil fracture network of a surface layer of a side slope on site, importing software for calculation, and obtaining the average width d of each fracture through statistics; the variance sigma is obtained by calculation 2 =1.9, and the crack width index b =25 was obtained according to the assignment rule.
S43: the method comprises the steps of taking pictures of a soil body fracture network on the surface layer of a side slope on site, importing the pictures into software for calculation, and counting to obtain the total number N of fractures; measuring by using a tape measure to obtain the maximum depth h of each crack c The depth h of the soil sample; calculating to obtain a fracture depth ratio x, and counting the number n of fractures with the same fracture depth ratio x; finally, calculating to obtain a fracture depth index c =5.
S44: according to the obtained related crack parameter information of the side slope surface layer, determining an index FRCI =0.35 × 15+0.3 × 25+0.35 × 5=14.5 of the rock slope surface soil crack network risk; as can be seen from Table 1, the fracture network risk of the slope surface layer is low.
The above description is only an exemplary embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes that are transformed by the content of the present specification and the attached drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A rock slope surface soil body fracture network risk evaluation method based on a soil body drying test is characterized by comprising the following steps:
s10: acquiring a soil surface layer fracture rate index a according to a drying test result of an indoor soil body;
s20: acquiring a soil surface layer crack width index b according to the drying test result of the indoor soil;
s30: acquiring a soil body surface layer crack depth index c according to a drying test result of an indoor soil body;
s40: according to the obtained soil body surface layer related fracture parameter information, defining a soil body surface layer fracture network risk contribution degree index model: FRCI =0.35 × a +0.3 × b +0.35 × c;
the FRCI is an index of contribution degree of risk of the soil body surface layer fracture network, the greater the FRCI value is, the higher the risk generated by the soil body surface layer fracture network is, and the smaller the FRCI value is, the lower the risk of the soil body fracture network of the rock slope surface layer is;
the statistical method of the soil body surface layer fracture rate index a comprises the following steps:
s11: obtaining a soil sample with stable surface layer fracture network development through a drying test;
s12, taking a picture of the surface of the sample: acquiring a picture of a soil sample surface layer fracture network through a shooting device;
s13, analyzing and counting the crack rate C by software r : tong (Chinese character of 'tong')Calculating and extracting soil body surface layer fracture rate C by over-analysis software r ；
S14: according to the crack rate C r The numerical value of (a) is a crack rate index a to be assigned;
the crack rate index a is determined according to the crack rate C of the soil surface layer r The value of the soil mass is determined, when the surface layer crack rate of the soil mass is 0 < C r When the content is less than or equal to 5 percent, the a =5; when the surface crack rate of the soil body is more than 5 percent and C r When the content is less than or equal to 10%, the a =10; when the surface layer crack rate of the soil body is more than 10 percent and more than C r When the content is less than or equal to 15 percent, the a =15; when the surface layer crack rate of the soil body is more than 15 percent and C r When the content is less than or equal to 20 percent, the a =20; when the surface layer crack rate of the soil body is more than 20 percent and C r When the content is less than or equal to 25 percent, the a =25; when the surface crack rate of the soil body is more than 25% < C r When the content is less than or equal to 30 percent, the a =30; when the surface layer crack rate of the soil body is more than 30 percent and C r When the content is less than or equal to 35 percent, the a =35; when the surface crack rate of the soil body is more than 35 percent and C r When the content is less than or equal to 40 percent, the a =40; when the surface layer crack rate of the soil body is more than 40 percent and C r When the content is less than or equal to 45 percent, the a =45; when the surface crack rate of the soil body is more than 45 percent and C r When the content is less than or equal to 50%, the a =50; when the surface layer crack rate of the soil body is more than 50 percent and C r When the content is less than or equal to 55 percent, the a =55; when the soil surface layer crack rate is more than 55 percent and more than C r When the content is less than or equal to 60 percent, the a =60; when the surface layer crack rate of the soil body is more than 60 percent and C r When the content is less than or equal to 65 percent, the a =65; when the surface layer crack rate of the soil body is more than 65 percent and C r When the content is less than or equal to 70%, the a =70; when the surface layer crack rate of the soil body is more than 70 percent C r When the content is less than or equal to 75 percent, the a =75; when the surface crack rate of the soil body is more than 75 percent and C r When the content is less than or equal to 80%, the a =80; when the surface layer crack rate of the soil body is more than 80 percent and C r When the content is less than or equal to 85 percent, the a =85; when the surface crack rate of the soil body is more than 85 percent and C r When the content is less than or equal to 90%, the a =90; when the surface layer crack rate of the soil body is more than 90 percent and C r When the content is less than or equal to 95%, the a =95; when the surface layer crack rate of the soil body is more than 95 percent and C r When the content is less than or equal to 100 percent, the a =100.
2. The rock slope surface soil body fracture network risk evaluation method based on the soil body drying test according to claim 1, characterized in that: the fracture network risk is low when FRCI e (0,25), low when FRCI e (25,50), high when FRCI e (50,75), and high when FRCI e (75,100).
3. The soil body surface fissure network risk evaluation method based on the soil body drying test according to claim 1, wherein the statistical method of the soil body surface fissure width index b comprises the following steps:
s21: obtaining a soil sample with stable surface layer fracture network development through a drying test;
s22, taking a picture of the surface of the sample: acquiring a picture of a soil sample surface layer fracture network through a shooting device;
s23, analyzing and counting the average width d of each crack by software: calculating and extracting the average width d of each crack on the surface layer of the soil body through analysis software;
s24, calculating the variance sigma 2 : the variance sigma is obtained by calculation 2 ；
S25: according to the variance σ 2 The numerical value of (b) is assigned as the fracture index b.
4. The soil body surface layer fracture network risk evaluation method based on the soil body drying test according to claim 3, characterized in that: the fissure index b is based on the variance σ 2 Is determined when the variance 0 < sigma 2 2 or less, and b =25; when the variance 2 < sigma 2 5 or less, and b =40; when the variance is 5 < sigma 2 10 or less, said b =50; when the variance is 10 < sigma 2 15 or less, said b =75; when variance σ 2 > 15, said b =100.
5. The soil body surface fissure network risk evaluation method based on the soil body drying test according to claim 1, wherein the statistical method of the soil body surface fissure depth index c comprises the following steps:
s31: obtaining a soil sample with stable surface layer fracture network development through a drying test;
s32, taking a picture of the surface of the sample: acquiring a picture of a soil sample surface layer fracture network through a shooting device;
s33, analyzing and counting the total number N of the fractures by software: calculating and extracting the total number N of the soil body surface layer fractures through analysis software;
s34, measuring the depth h of each crack c : measuring the maximum crack depth h by extending the tape into the crack c ；
S35: according to the measured maximum depth h of the crack c Defining the ratio x of the fracture depths as follows: x = h c /h；
Wherein x is the ratio of the fracture depth; h is the depth of the soil body;
s36: counting the number of the fractures with the same fracture depth ratio x according to the computed fracture depth ratio x, and recording the number as n;
s37: classifying fractures with different depths according to the computed fracture depth ratio x, wherein the fracture depth ratio x is defined as a fracture depth index c, and the computing method is c = N/N;
wherein n is the number of cracks with the same crack depth ratio x; n is the total number of cracks.
6. The soil body surface fissure network risk evaluation method based on the soil body drying test according to claim 5, wherein the classification standard of the ratio x of the soil body surface fissure depths is as follows:
Ⅰ、0＜h c h is less than or equal to 0.25 and is marked as x 1 And counting the corresponding n, which is recorded as n 1 ；
Ⅱ、0.25＜h c H is less than or equal to 0.5 and is marked as x 2 And counting the corresponding n, which is recorded as n 2 ；
Ⅲ、0.5＜h c H is less than or equal to 0.75 and is marked as x 3 And counting the corresponding n, which is recorded as n 3 ；
Ⅳ、0.75＜h c H is less than or equal to 1 and is marked as x 4 And counting the corresponding n, which is recorded as n 4 。
7. The soil body surface fissure network risk evaluation method based on the soil body drying test according to claim 6, wherein the evaluation method of the soil body surface fissure depth index c is defined as follows, c =5 × (n) 1 /N）+15×（n 2 /N）+30×（n 3 /N）+50×（n 4 /N）。
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