CN111521528B - Slurry shield mud film quality evaluation method - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000013441 quality evaluation Methods 0.000 title claims abstract description 18
- 239000002002 slurry Substances 0.000 title claims description 43
- 238000012360 testing method Methods 0.000 claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000000463 material Substances 0.000 claims description 35
- 238000001914 filtration Methods 0.000 claims description 27
- 229920001971 elastomer Polymers 0.000 claims description 20
- 239000010802 sludge Substances 0.000 claims description 19
- 230000015572 biosynthetic process Effects 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 14
- 239000004576 sand Substances 0.000 claims description 10
- 239000004519 grease Substances 0.000 claims description 9
- 230000001050 lubricating effect Effects 0.000 claims description 9
- 230000035515 penetration Effects 0.000 claims description 8
- 230000035699 permeability Effects 0.000 claims description 7
- 239000002689 soil Substances 0.000 claims description 7
- 238000001764 infiltration Methods 0.000 claims description 6
- 230000008595 infiltration Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 5
- 229920006395 saturated elastomer Polymers 0.000 claims description 4
- 238000012512 characterization method Methods 0.000 claims description 3
- 239000007779 soft material Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 235000006506 Brasenia schreberi Nutrition 0.000 abstract 1
- 244000267222 Brasenia schreberi Species 0.000 abstract 1
- 238000005755 formation reaction Methods 0.000 description 13
- 239000012528 membrane Substances 0.000 description 6
- 238000009412 basement excavation Methods 0.000 description 5
- 239000012466 permeate Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/04—Investigating osmotic effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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Abstract
The invention discloses a muddy water shield mud film quality evaluation method, which adopts a concept of a hypothetical ideal mud film to respectively test the water seepage q of a certain stratum under the ideal mud film and the actual mud film 0 、q i By q 0 /q i The quality of the mud film is represented, the value is between 0 and 1, the closer to 1, the better the quality of the mud film is, the mud film quality evaluation parameters are simple and easy to obtain and easy to compare and evaluate, all different stratums can be unified, relevant parameters and requirements are not changed due to the different stratums, and meanwhile, the mud film quality evaluation method is not influenced by factors such as equipment area and height, the test can be carried out by adopting conventional test equipment and methods, the workload caused by conversion of various units is reduced, a brand new thought is provided for mud film quality evaluation, and the mud film quality evaluation method has theoretical and practical guiding significance.
Description
Technical Field
The invention relates to the technical field of slurry shields. More specifically, the invention relates to a slurry shield mud film quality evaluation method.
Background
The stability of the slurry shield excavation surface is maintained by the comprehensive action of the following three factors: 1) The mud pressure balances the soil pressure and the water pressure; 2) Forming a watertight mud film on the excavation surface, so that the mud pressure effectively plays a role; 3) And (3) the slurry permeates into a certain range of stratum from the excavation surface, so that the cohesive force of the stratum of the excavation surface is increased, wherein the formation of a waterproof sludge film on the excavation surface is a core factor.
In the aspect of evaluating the property of the excavated surface mud film, the following modes are mainly adopted at present; 1) Evaluating the quality of the mud film by adopting the limit supporting pressure which can be born by the mud film; 2) The quality and the like of the sludge membrane are evaluated by the water filtration amount in the mud infiltration process, and the smaller the water filtration amount is, the easier the sludge membrane is to form and the better the quality is; 3) Respectively converting the mud pressure in the mud film forming process into an effective stress proportion and magnitude to serve as mud film quality evaluation indexes; 4) Evaluating the mud film according to the property index of the mud film. The method is simple and visual, and accords with actual engineering conditions, a comparison method is adopted in actual operation, namely, one group with smaller water filtration is selected through comparison of a plurality of groups of slurry, the quality of the sludge membrane is considered to be better, and accordingly the slurry mix proportion is screened out.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
The invention also aims to provide a slurry shield mud film quality evaluation method, which provides specific parameters for evaluating the quality of mud films formed by different slurries in different stratums and has good engineering guidance significance.
In order to achieve these objects and other advantages, the present invention provides a slurry shield sludge membrane quality evaluation method, comprising the steps of:
simulating an infiltration process of the slurry in the stratum to perform an infiltration film forming test to obtain the water filtration quantity qi of the slurry in the stratum;
step two, adding a layer of ideal mud skin between the mud and the stratum to completely separate the mud from the stratum, and performing a permeation film forming test again by adopting the same method as the step one to obtain ideal water filtration quantity q 0 Wherein, the ideal mud skin is a soft material and clings to the stratum material, and when the mud pressure is not more than 0.6MPa, the water permeability of the ideal mud skin is 0;
step three, using q 0 /q i Characterization of the quality of the mudfilm, q 0 /q i Has a value of between 0 and 1, q 0 /q i The closer to 1, the better the sludge film quality.
Preferably, the testing method of the permeation film formation test comprises the following steps:
step a, taking a columnar transparent container capable of bearing a certain pressure, sequentially filling a filter layer material saturated by water and a test stratum material with the dry density of 1.5g/cm & lt 3 & gt into the columnar transparent container, then injecting slurry into the test stratum material, and sealing the columnar transparent container;
b, applying air pressure not greater than 0.6MPa into the columnar transparent container from the upper part of the slurry to start a penetration test;
and c, collecting the water filtered from the filter layer material, wherein the total collected amount after pressurization is the filtered water amount.
Preferably, the filter layer material is medium coarse sand with the particle size of 2-5mm, and the test formation material is sandy soil with the particle size of 0.075-5 mm.
Preferably, the ideal mud skin is a rubber pad with a cross section consistent with the shape of the inner section of the columnar transparent container and lubricating grease coated on the side surface, and the thickness of the rubber pad is more than or equal to 5mm.
Preferably, the pressure applied in step b is 0.3MPa.
Preferably, the pressure is applied in step b by a grading operation, the pressure is divided into six stages in total, the pressure of each stage is increased by 0.05MPa step by step, and the pressurizing time of each stage is 200s.
Preferably, the side of the rubber pad is provided with an annular groove, and the annular groove is filled with lubricating grease.
Preferably, q is 0 /q i When the value of (A) is 0.2 or less, it means that no sludge film is formed, and q is 0 /q i A value of (a) between 0.2 and 0.4 indicates poor quality of the sludge film, q 0 /q i The value of (a) is between 0.4 and 0.6 indicates that the mud film quality is better, q 0 /q i A value of (D) of 0.6 or more indicates excellent sludge film quality.
The invention at least comprises the following beneficial effects: the method for evaluating the quality of the slurry shield mud film adopts a concept of imaginary ideal mud film to respectively test the water seepage q of a certain stratum under the ideal mud film and the actual mud film 0 、q i By q of 0 /q i The quality of the mud film is represented, the value is between 0 and 1, the closer to 1, the better the quality of the mud film is, the mud film quality evaluation parameters are simple and easy to obtain and easy to compare and evaluate, all different stratums can be unified, relevant parameters and requirements are not changed due to the different stratums, and meanwhile, the mud film quality evaluation method is not influenced by factors such as equipment area and height, the test can be carried out by adopting conventional test equipment and methods, the workload caused by conversion of various units is reduced, a brand new thought is provided for mud film quality evaluation, and the mud film quality evaluation method has theoretical and practical guiding significance.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic diagram of the internal structure of a step-test apparatus according to the present invention;
FIG. 2 is a schematic structural diagram of a step two testing apparatus according to the present invention;
FIG. 3 is a schematic structural view of a rubber mat according to an embodiment of the present invention;
FIG. 4 is a graph comparing the ideal mudskin drainage in 5 formations of the present invention;
FIG. 5 is a plot of the water filtrate ratio for 9 mud sets of the present invention at 5 formation representative particle sizes.
Description reference numbers indicate: 1. filter layer material, 2, test formation material, 3, mud, 4, mud top, 5, ideal mud skin, 6 and annular groove.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials described therein are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1 to 5, the method for evaluating the quality of the slurry shield mud film comprises the following steps:
step one, adopting the conventional slurry shield in the prior artSimulating a test device and a method, such as a test column and the like, simulating the infiltration process of slurry 3 in a stratum, preparing a filter layer material 1, a test stratum material 2 and slurry 3 to be used in actual cabin opening engineering, placing the filter layer material 1, the test stratum material 2 and the slurry 3 in sequence to perform a penetration film forming test, giving a certain air pressure to the slurry 3, forming a layer of mud skin on the surface of the test stratum by the slurry 3, forming a section of penetration zone in the stratum, and finally filtering and collecting the penetration zone through the filter layer to obtain the water filtration q of the slurry 3 in the stratum i ；
Step two, adopting a device and an operation method which are the same as those in the step one, adding a layer of ideal mud skin 5 on the tested stratum material 2 before adding the mud 3 to completely separate the mud 3 from the stratum, forming a completely airtight mud film at the moment of simulating the contact of the mud 3 and the stratum, wherein the thickness of the mud film is relatively small, the ideal mud skin 5 is selected from a thin-layer soft material which is impermeable to water, can adapt to the adhesion of the deformation of the stratum and the stratum, enables the pressure of the mud 3 to be completely transmitted to the stratum and completely impermeable under the pressure of 0.6MPa, ensures that the mud 3 cannot permeate into the stratum under the pressure, and then performing a permeation film forming test once to obtain the ideal water filtration quantity q 0 ；
Step three, using q 0 /q i Characterization of the quality of the mudfilm, q 0 /q i Has a value of between 0 and 1, q 0 /q i The closer to 1, the better the sludge film quality.
The method for evaluating the quality of the slurry shield mud film adopts a concept of imaginary ideal mud film to respectively test the water seepage q of a certain stratum under the ideal mud film and the actual mud film 0 、q i By q 0 /q i The quality of the mud film is represented, the value is between 0 and 1, and the closer to 1, the more the actual water filtration q is represented i The smaller the size is, the better the quality of the mud film is, the quality evaluation parameters of the mud film are simple and easy to obtain, the comparison and evaluation are easy, all different stratums can be unified, relevant parameters and requirements are not changed due to different stratums, the influence of factors such as equipment area and height is avoided, the test can be carried out by adopting conventional test equipment and methods, the workload caused by conversion of various units is reduced, and the quality evaluation of the mud film is realizedProvides a brand new thought and has theoretical and practical guiding significance.
In another embodiment, the testing method of the permeation film formation test comprises the following steps:
step a, taking a columnar transparent container capable of bearing certain pressure, and sequentially filling a filter layer material 1 saturated by water and a dry density of 1.5g/cm into the columnar transparent container 3 Then injecting slurry 3 on the test stratum material 2, and sealing the columnar transparent container;
b, applying air pressure not greater than 0.6MPa into the columnar transparent container from the upper part 4 of the slurry to start a penetration test;
and c, collecting the water filtered from the filter layer material 1, wherein the total collected amount after pressurization is the filtered water amount.
When the slurry film forming test is performed by the test method:
the mud adopts an orthogonal design method to design mud parameters, three factors of effective grain size, specific gravity and viscosity of the mud are selected as variables, the effective grain size of the mud is selected by adopting pure bentonite mud (base mud) with the expansion-water ratio of 1.
TABLE 1 table for values of various factors
The combination of the factors A, B and C including 3 parameters in Table 1 gave 9 mud test groups as shown in Table 2, the effective particle diameter d 85 The (. Mu.m) is the particle size of 85% of the slurry particle size cumulative curve.
TABLE 2 basic Property parameters of the mud test groups of set 9
| Test No. | A | B | C | Density (g/cm) 3 ) | Funnel viscosity(s) | Effective particle diameter d 85 (μm) |
| 1 | A1 | B1 | C1 | 1.1 | 49 | 78 |
| 2 | A1 | B2 | C2 | 1.2 | 87 | 82 |
| 3 | A1 | B3 | C3 | 1.3 | 158 | 85 |
| 4 | A2 | B1 | C2 | 1.1 | 75 | 155 |
| 5 | A2 | B2 | C3 | 1.2 | 139 | 162 |
| 6 | A2 | B3 | C1 | 1.3 | 46 | 170 |
| 7 | A3 | B1 | C3 | 1.1 | 129 | 260 |
| 8 | A3 | B2 | C1 | 1.2 | 39 | 270 |
| 9 | A3 | B3 | C2 | 1.3 | 77 | 282 |
The test stratum material is sand with high permeability, the sand is sand in single grain size range and is obtained by screening natural sand, 5 strata are selected for testing, and the parameters of sand particles are shown in table 3.
TABLE 3 particle size ranges and permeability coefficients for 5 formations
| Sequence number of |
1 | 2 | 3 | 4 | 5 |
| Particle size range (mm) | 0.075～0.25 | 0.25～0.5 | 0.5～1 | 1～2 | 2～5 |
| Formation permeability coefficient (cm/s) | 0.012 | 0.051 | 0.22 | 0.81 | 3.3 |
| Stratum representative particle diameter D 15 (mm) | 0.11 | 0.32 | 0.64 | 1.22 | 2.69 |
The testing device selects a penetration column with the diameter of 10cm and the height of 80cm, medium coarse sand with the height of 5cm and the grain diameter of 2-5mm is filled at the lower part of the penetration column as a filter layer material before the test is started, and then sandy soil testing stratum material with the height of 27cm is filled, and the dry density of the sandy soil stratum material is 1.5g/cm 3 The method comprises the steps of firstly injecting water into a permeation column, then filling a filter layer material and a test stratum material into the saturated filter layer and the stratum material by adopting a forward saturation method, then injecting slurry of about 20cm into the permeation column, sealing a flange plate on the permeation column, applying air pressure of 0.3MPa into the permeation column from the upper part of the slurry through an air compressor and a pressure stabilizing valve, opening a communication valve at the bottom end of the permeation column, collecting filtered water quantity by using a beaker for permeation test, weighing by using a balance, introducing air pressure by adopting a grading operation, totally dividing into six stages, gradually increasing the pressure of each stage by 0.05MPa, namely, respectively 0.05MPa, 0.1MPa, 0.15MPa, 0.2MPa, 0.25MPa and 0.3MPa from one stage to six stages, pressurizing time of each stage for 200s, and collecting the filtered water quantity each time for 1200s.
The slurry percolation test was performed on 5 formations shown in Table 3 using 9 slurries shown in Table 2 for 45 setsTest, recording the amount of filtered water q during the test i Time-dependent, type of mudfilm formation. Measuring the ideal water filtration q of the five strata by an ideal mud-skin method 0 As shown in fig. 4, the test results show that the drainage obtained in different strata is inevitably different, the ideal drainage obtained is also different, the particle size of the strata is increased, and the drainage is increased as the permeability coefficient is increased. Then obtaining ideal water filtration quantity q by using each stratum 0 The filtered water quantity q is obtained by dividing by 9 different mud i A profile of 9 drainage ratios (denoted P) for 5 formations below is obtained as shown in figure 5.
By combining the graph of fig. 5 and the observation of the shape of the mud film, the water filtration volume ratio of different mud of different stratums is basically between 0 and 0.8, and the maximum water filtration volume ratio is gradually reduced along with the increase of the grain size of the stratum, which indicates that the difficulty of forming a high-quality mud film by the mud is higher along with the increase of the grain size of the stratum; the mud with the water filtration ratio below 0.2 completely permeates in the stratum without forming a mud film, the water filtration ratio is between 0.2 and 0.6 and forms a mud film or a mud film plus a permeation zone, the water filtration ratio is more than 0.6 and is the minimum value of the water filtration amount under each stratum, the formed mud film is a high-quality mud film, except that the water filtration ratio is not more than 0.6 in the No. 5 stratum, the other strata can form the high-quality mud film, the mud in the stratum with the thickness of 2 to 5mm has an optimized space, and the q groups of mud permeation test results are combined, so that the mud is considered to have an optimized space, and the q groups of mud permeation test results are considered to be combined 0 /q i When the value of (A) is 0.2 or less, it means that no sludge film is formed, and q is 0 /q i The value of (a) is between 0.2 and 0.4, the quality of the mud film is poor, q 0 /q i The value of q is between 0.4 and 0.6, the quality of the mud film is better 0 /q i The mud film quality is excellent when the value of (A) is more than 0.6.
In another technical scheme, the filter layer material 1 is medium coarse sand with the grain diameter of 2-5mm, and the test formation material 2 is sandy soil with the grain diameter of 0.075-5 mm. The filtering layer material is medium coarse sand with the grain diameter of 2-5mm, the water permeability is good, and a sandy soil stratum with the grain diameter of 0.075-5mm is selected to represent a typical high-permeability stratum, so that the filtering layer material is more in line with the actual working condition.
In another technical scheme, the ideal mud skin 5 is a rubber pad with a cross section consistent with the shape of the inner section of the cylindrical transparent container and lubricating grease coated on the side surface, and the thickness of the rubber pad is more than or equal to 5mm. As shown in fig. 2, the rubber pad is selected from the ideal mud skin, the rubber pad is soft in texture and good in deformation performance, the rubber pad can be tightly attached to a test stratum to adapt to stratum deformation, the waterproof effect is good, the shape of the rubber pad is consistent with the shape of the inner section of the cylindrical transparent container, the side face of the rubber pad is sealed with the contact part of the inner wall of the permeation column, it is guaranteed that mud cannot permeate the stratum under the recompression through the pipe wall, lubricating grease is coated on the circumferential side face, the auxiliary rubber pad plays roles of lubrication and sealing, smooth movement of the rubber pad and the pressure is facilitated, meanwhile, the situation that mud enters the stratum from the space between the ideal mud skin and the inner wall of the permeation column under the pressure to influence the test is avoided, the mud film is generally thin, therefore, the thickness of the rubber pad can be set to be 5mm at the lowest, the thickness is not too low, the mud is not beneficial to blocking and the water permeation is prevented, and the test result is not matched with the actual film forming thickness to cause the inaccuracy.
In another embodiment, the pressure applied in step b is 0.3MPa. The working condition of 0.3MPa is closer to the actual mud film forming working condition, and the requirement of test conditions is favorably reduced.
In another technical scheme, when the pressure is applied in the step b, a grading operation is adopted, the pressure is totally divided into six stages, the pressure of each stage is increased by 0.05MPa step by step, and the pressurizing time of each stage is 200s. The method comprises the steps of applying air pressure in six stages for increasing progressively, stably increasing the water filtration amount under each stage of pressure, judging whether the mud can form a film in the test stratum or not by using the first stage of mud pressure, and judging the quality of the mud film formed by the mud in the test stratum by using the following five stages of mud pressure.
In another technical scheme, as shown in fig. 3, an annular groove 6 is formed in the side surface of the rubber pad, and lubricating grease is filled in the annular groove 6. The side of rubber pad sets up to sunken annular groove, holds including lubricating grease, and the elasticity that cooperation rubber pad itself has pins lubricating grease that can be better in the recess, runs off the part when preventing to receive the extrusion and arrives the stratum, well separation mud and experimental stratum.
In another embodiment, q is 0 /q i When the value of (A) is 0.2 or less, it means thatFormation of a sludge film, q 0 /q i A value of (a) between 0.2 and 0.4 indicates poor quality of the sludge film, q 0 /q i The value of (q) is between 0.4 and 0.6, which means that the mud film quality is better, q 0 /q i A value of (2) or more indicates that the sludge film has excellent quality.
The method can well guide the practical engineering by classifying the quality of the sludge membrane through the water filtration ratio, and in the practical application process, the water filtration amount corresponding to an ideal sludge membrane can be measured firstly as long as the stratum is determined, and then the proper slurry is screened out according to the water filtration amount ratio q 0 /q i The higher the value is, the higher the preparation difficulty of the slurry is, and the water filtration ratio q is ensured 0 /q i The quality of the mud film can be ensured above 0.4, so that the mud parameters are determined, and the tunneling efficiency is ensured.
While embodiments of the invention have been described above, it is not intended to be limited to the details shown, described and illustrated herein, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed, and to such extent that such modifications are readily available to those skilled in the art, and it is not intended to be limited to the details shown and described herein without departing from the general concept as defined by the appended claims and their equivalents.
Claims (4)
1. The quality evaluation method of the slurry shield mud film is characterized by comprising the following steps:
simulating the infiltration process of the slurry in the stratum to perform an infiltration film forming test to obtain the water filtration q of the slurry in the stratum i ；
Specifically, the method comprises the following steps of,
step a, taking a columnar transparent container capable of bearing certain pressure, and sequentially filling a filter layer material saturated by water and a dry density of 1.5g/cm into the columnar transparent container 3 Then injecting slurry on the test stratum material, and sealing the columnar transparent container;
b, applying air pressure not greater than 0.6MPa into the columnar transparent container from the upper part of the slurry to start a penetration test;
the pressure applied in this step is 0.3MPa; when pressure is applied, the step operation is adopted, the total pressure is divided into six steps, the pressure of each step is increased by 0.05MPa step by step, and the pressurizing time of each step is 200s;
c, collecting the water filtered from the filter layer material, wherein the total collected amount after pressurization is the filtered water amount;
step two, adding a layer of ideal mud skin between the mud and the stratum to completely separate the mud from the stratum, and performing a permeation film forming test again by adopting the same method as the step one to obtain ideal water filtration quantity q 0 Wherein, the ideal mud skin is a soft material and clings to the stratum material, and when the mud pressure is not more than 0.6MPa, the water permeability of the ideal mud skin is 0;
the ideal mud skin is a rubber pad with a cross section consistent with the shape of the inner cross section of the columnar transparent container and lubricating grease coated on the side surface, and the thickness of the rubber pad is more than or equal to 5mm;
step three, using q 0 /q i Characterization of the quality of the mud film, q 0 /q i Has a value of 0 to 1, q 0 /q i The closer to 1, the better the sludge film quality.
2. The method for evaluating the quality of the slurry shield mud film as claimed in claim 1, wherein the filter layer material is medium coarse sand with the particle size of 2-5mm, and the test formation material is sandy soil with the particle size of 0.075-5 mm.
3. The method for evaluating the quality of the slurry shield sludge film as claimed in claim 1, wherein an annular groove is formed in the side surface of the rubber pad, and lubricating grease is filled in the annular groove.
4. The method for evaluating the quality of the slurry shield mud film as claimed in claim 1, wherein q is 0 /q i When the value of (b) is 0.2 or less, it means that no sludge film is formed, and q is 0 /q i The value of q is between 0.2 and 0.4, which indicates that the mud film quality is poor, q 0 /q i The value of (a) is between 0.4 and 0.6, the quality of the mud film is better, and q is 0 /q i A value of 0.6 or more indicates a muddy textureThe dosage is excellent.
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